1448 lines
69 KiB
Plaintext
1448 lines
69 KiB
Plaintext
*youcompleteme* YouCompleteMe: a code-completion engine for Vim
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===============================================================================
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Contents ~
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1. Introduction |youcompleteme-introduction|
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2. Mac OS X super-quick installation |youcompleteme-mac-os-x-super-quick-installation|
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3. Ubuntu Linux x64 super-quick installation |youcompleteme-ubuntu-linux-x64-super-quick-installation|
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4. Windows Installation |youcompleteme-windows-installation|
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5. Full Installation Guide |youcompleteme-full-installation-guide|
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6. User Guide |youcompleteme-user-guide|
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1. General Usage |youcompleteme-general-usage|
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2. Completion string ranking |youcompleteme-completion-string-ranking|
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3. General Semantic Completion Engine Usage |youcompleteme-general-semantic-completion-engine-usage|
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4. C-family Semantic Completion Engine Usage |youcompleteme-c-family-semantic-completion-engine-usage|
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5. Python semantic completion |youcompleteme-python-semantic-completion|
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6. Semantic completion for other languages |youcompleteme-semantic-completion-for-other-languages|
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7. Writing New Semantic Completers |youcompleteme-writing-new-semantic-completers|
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8. Syntastic integration |youcompleteme-syntastic-integration|
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7. Commands |youcompleteme-commands|
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1. The ':YcmForceCompileAndDiagnostics' command |:YcmForceCompileAndDiagnostics|
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2. The ':YcmDiags' command |:YcmDiags|
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3. The ':YcmShowDetailedDiagnostic' command |:YcmShowDetailedDiagnostic|
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4. The ':YcmDebugInfo' command |:YcmDebugInfo|
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5. The ':YcmCompleter' command |:YcmCompleter|
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8. YcmCompleter subcommands |youcompleteme-ycmcompleter-subcommands|
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1. The 'GoToDeclaration' subcommand |GoToDeclaration|
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2. The 'GoToDefinition' subcommand |GoToDefinition|
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3. The 'GoToDefinitionElseDeclaration' subcommand |GoToDefinitionElseDeclaration|
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4. The 'ClearCompilationFlagCache' subcommand |ClearCompilationFlagCache|
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9. Options |youcompleteme-options|
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1. The 'g:ycm_min_num_of_chars_for_completion' option |g:ycm_min_num_of_chars_for_completion|
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2. The 'g:ycm_filetype_whitelist' option |g:ycm_filetype_whitelist|
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3. The 'g:ycm_filetype_blacklist' option |g:ycm_filetype_blacklist|
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4. The 'g:ycm_filetype_specific_completion_to_disable' option |g:ycm_filetype_specific_completion_to_disable|
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5. The 'g:ycm_register_as_syntastic_checker' option |g:ycm_register_as_syntastic_checker|
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6. The 'g:ycm_allow_changing_updatetime' option |g:ycm_allow_changing_updatetime|
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7. The 'g:ycm_complete_in_comments' option |g:ycm_complete_in_comments|
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8. The 'g:ycm_complete_in_strings' option |g:ycm_complete_in_strings|
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9. The 'g:ycm_collect_identifiers_from_comments_and_strings' option |g:ycm_collect_identifiers_from_comments_and_strings|
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10. The 'g:ycm_collect_identifiers_from_tags_files' option |g:ycm_collect_identifiers_from_tags_files|
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11. The 'g:ycm_seed_identifiers_with_syntax' option |g:ycm_seed_identifiers_with_syntax|
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12. The 'g:ycm_add_preview_to_completeopt' option |g:ycm_add_preview_to_completeopt|
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13. The 'g:ycm_autoclose_preview_window_after_completion' option |g:ycm_autoclose_preview_window_after_completion|
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14. The 'g:ycm_autoclose_preview_window_after_insertion' option |g:ycm_autoclose_preview_window_after_insertion|
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15. The 'g:ycm_max_diagnostics_to_display' option |g:ycm_max_diagnostics_to_display|
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16. The 'g:ycm_key_list_select_completion' option |g:ycm_key_list_select_completion|
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17. The 'g:ycm_key_list_previous_completion' option |g:ycm_key_list_previous_completion|
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18. The 'g:ycm_key_invoke_completion' option |g:ycm_key_invoke_completion|
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19. The 'g:ycm_key_detailed_diagnostics' option |g:ycm_key_detailed_diagnostics|
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20. The 'g:ycm_global_ycm_extra_conf' option |g:ycm_global_ycm_extra_conf|
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21. The 'g:ycm_confirm_extra_conf' option |g:ycm_confirm_extra_conf|
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22. The 'g:ycm_extra_conf_globlist' option |g:ycm_extra_conf_globlist|
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23. The 'g:ycm_filepath_completion_use_working_dir' option |g:ycm_filepath_completion_use_working_dir|
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24. The 'g:ycm_semantic_triggers' option |g:ycm_semantic_triggers|
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25. The 'g:ycm_cache_omnifunc' option |g:ycm_cache_omnifunc|
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10. FAQ |youcompleteme-faq|
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1. I get a linker warning regarding 'libpython' on Mac when compiling YCM |libpython|
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2. I get a weird window at the top of my file when I use the semantic engine |youcompleteme-i-get-weird-window-at-top-of-my-file-when-i-use-semantic-engine|
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3. It appears that YCM is not working |youcompleteme-it-appears-that-ycm-is-not-working|
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4. I cannot get the Syntastic integration to work |youcompleteme-i-cannot-get-syntastic-integration-to-work|
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5. Sometimes it takes much longer to get semantic completions than normal |youcompleteme-sometimes-it-takes-much-longer-to-get-semantic-completions-than-normal|
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6. Vim flickers every time I move the cursor or moving the cursor is slow |youcompleteme-vim-flickers-every-time-i-move-cursor-or-moving-cursor-is-slow|
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7. YCM auto-inserts completion strings I don't want! |youcompleteme-ycm-auto-inserts-completion-strings-i-dont-want|
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8. I get a 'E227: mapping already exists for <blah>' error when I start Vim |E227:-mapping-already-exists-for-blah|
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9. I get "'GLIBC_2.XX' not found (required by libclang.so)" when starting Vim |GLIBC_2.XX-not-found()|
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10. I'm trying to use a Homebrew Vim with YCM and I'm getting segfaults |youcompleteme-im-trying-to-use-homebrew-vim-with-ycm-im-getting-segfaults|
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11. I have a Homebrew Python and/or MacVim; can't compile/SIGABRT when starting |youcompleteme-i-have-homebrew-python-and-or-macvim-cant-compile-sigabrt-when-starting|
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12. Vim segfaults when I use the semantic completer in Ruby files |youcompleteme-vim-segfaults-when-i-use-semantic-completer-in-ruby-files|
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13. I get 'LONG_BIT definition appears wrong for platform' when compiling |LONG_BIT-definition-appears-wrong-for-platform|
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14. I get 'Vim: Caught deadly signal SEGV' on Vim startup |Vim:-Caught-deadly-signal-SEGV|
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15. YCM does not read identifiers from my tags files |youcompleteme-ycm-does-not-read-identifiers-from-my-tags-files|
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16. 'CTRL-U' in insert mode does not work |CTRL-sub-U|
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17. Why isn't YCM just written in plain VimScript, FFS? |youcompleteme-why-isnt-ycm-just-written-in-plain-vimscript-ffs|
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18. Why does YCM demand such a recent version of Vim? |youcompleteme-why-does-ycm-demand-such-recent-version-of-vim|
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19. I get annoying messages in Vim's status area when I type |youcompleteme-i-get-annoying-messages-in-vims-status-area-when-i-type|
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20. Nasty bugs happen if I have the 'vim-autoclose' plugin installed |vim-sub-autoclose|
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11. Contact |youcompleteme-contact|
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12. License |youcompleteme-license|
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13. References |youcompleteme-references|
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===============================================================================
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*youcompleteme-introduction*
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Introduction ~
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Image: Build Status [1]
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YouCompleteMe is a fast, as-you-type, fuzzy-search code completion engine for
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Vim. It has several completion engines: an identifier-based engine that works
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with every programming language, a semantic, Clang [3]-based engine that
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provides native semantic code completion for C/C++/Objective-C/Objective-C++
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(from now on referred to as "the C-family languages"), a Jedi [4]-based
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completion engine for Python and an omnifunc-based completer that uses data
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from Vim's omnicomplete system to provide semantic completions for many other
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languages (Ruby, PHP etc.).
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Image: YouCompleteMe GIF demo (see reference [5])
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Here's an explanation of what happens in the short GIF demo above.
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First, realize that **no keyboard shortcuts had to be pressed** to get the list
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of completion candidates at any point in the demo. The user just types and the
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suggestions pop up by themselves. If the user doesn't find the completion
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suggestions relevant and/or just wants to type, they can do so; the completion
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engine will not interfere.
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When the user sees a useful completion string being offered, they press the TAB
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key to accept it. This inserts the completion string. Repeated presses of the
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TAB key cycle through the offered completions.
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If the offered completions are not relevant enough, the user can continue
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typing to further filter out unwanted completions.
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A critical thing to notice is that the completion **filtering is NOT based on
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the input being a string prefix of the completion** (but that works too). The
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input needs to be a _subsequence [6] match_ of a completion. This is a fancy
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way of saying that any input characters need to be present in a completion
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string in the order in which they appear in the input. So 'abc' is a
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subsequence of 'xaybgc', but not of 'xbyxaxxc'. After the filter, a complicated
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sorting system ranks the completion strings so that the most relevant ones rise
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to the top of the menu (so you usually need to press TAB just once).
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**All of the above works with any programming language** because of the
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identifier-based completion engine. It collects all of the identifiers in the
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current file and other files you visit (and your tags files) and searches them
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when you type (identifiers are put into per-filetype groups).
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The demo also shows the semantic engine in use. When the user presses '.', '->'
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or '::' while typing in insert mode (for C++; different triggers are used for
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other languages), the semantic engine is triggered (it can also be triggered
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with a keyboard shortcut; see the rest of the docs).
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The last thing that you can see in the demo is YCM's integration with Syntastic
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[7] (the little red X that shows up in the left gutter) if you are editing a
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C-family file. As Clang compiles your file and detects warnings or errors, they
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will be piped to Syntastic for display. You don't need to save your file or
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press any keyboard shortcut to trigger this, it "just happens" in the
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background.
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In essence, YCM obsoletes the following Vim plugins because it has all of their
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features plus extra:
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- clang_complete
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- AutoComplPop
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- Supertab
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- neocomplcache
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YCM also provides semantic go-to-definition/declaration commands for C-family
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languages & Python. Expect more IDE features powered by the various YCM
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semantic engines in the future.
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You'll also find that YCM has filepath completers (try typing './' in a file)
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and a completer that integrates with UltiSnips [8].
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===============================================================================
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*youcompleteme-mac-os-x-super-quick-installation*
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Mac OS X super-quick installation ~
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Please refer to the full Installation Guide below; the following commands are
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provided on a best-effort basis and may not work for you.
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Install the latest version of MacVim [9]. Yes, MacVim. And yes, the _latest_.
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If you don't use the MacVim GUI, it is recommended to use the Vim binary that
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is inside the MacVim.app package ('MacVim.app/Contents/MacOS/Vim'). To ensure
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it works correctly copy the 'mvim' script from the MacVim [9] download to your
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local binary folder (for example '/usr/local/bin/mvim') and then symlink it:
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>
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ln -s /usr/local/bin/mvim vim
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<
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Install YouCompleteMe with Vundle [10].
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**Remember:** YCM is a plugin with a compiled component. If you **update** YCM
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using Vundle and the ycm_core library API has changed (happens rarely), YCM
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will notify you to recompile it. You should then rerun the install process.
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It's recommended that you have the latest Xcode installed along with the latest
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Command Line Tools (that you install from within Xcode).
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Install CMake. Preferably with Homebrew [11], but here's the stand-alone CMake
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installer [12].
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_If_ you have installed a Homebrew Python and/or Homebrew MacVim, see the _FAQ_
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for details.
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Compiling YCM **with** semantic support for C-family languages:
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>
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cd ~/.vim/bundle/YouCompleteMe
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./install.sh --clang-completer
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<
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Compiling YCM **without** semantic support for C-family languages:
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>
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cd ~/.vim/bundle/YouCompleteMe
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./install.sh
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<
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That's it. You're done. Refer to the _User Guide_ section on how to use YCM.
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Don't forget that if you want the C-family semantic completion engine to work,
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you will need to provide the compilation flags for your project to YCM. It's
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all in the User Guide.
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YCM comes with sane defaults for its options, but you still may want to take a
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look at what's available for configuration. There are a few interesting options
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that are conservatively turned off by default that you may want to turn on.
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===============================================================================
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*youcompleteme-ubuntu-linux-x64-super-quick-installation*
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Ubuntu Linux x64 super-quick installation ~
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Please refer to the full Installation Guide below; the following commands are
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provided on a best-effort basis and may not work for you.
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Make sure you have Vim 7.3.584 with python2 support. At the time of writing,
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the version of Vim shipping with Ubuntu is too old. You may need to compile Vim
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from source [13] (don't worry, it's easy).
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Install YouCompleteMe with Vundle [10].
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**Remember:** YCM is a plugin with a compiled component. If you **update** YCM
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using Vundle and the ycm_core library API has changed (happens rarely), YCM
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will notify you to recompile it. You should then rerun the install process.
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Install development tools and CMake: 'sudo apt-get install build-essential
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cmake'
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Make sure you have Python headers installed: 'sudo apt-get install python-dev'.
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Compiling YCM **with** semantic support for C-family languages:
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>
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cd ~/.vim/bundle/YouCompleteMe
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./install.sh --clang-completer
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<
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Compiling YCM **without** semantic support for C-family languages:
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>
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cd ~/.vim/bundle/YouCompleteMe
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./install.sh
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<
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That's it. You're done. Refer to the _User Guide_ section on how to use YCM.
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Don't forget that if you want the C-family semantic completion engine to work,
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you will need to provide the compilation flags for your project to YCM. It's
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all in the User Guide.
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YCM comes with sane defaults for its options, but you still may want to take a
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look at what's available for configuration. There are a few interesting options
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that are conservatively turned off by default that you may want to turn on.
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===============================================================================
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*youcompleteme-windows-installation*
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Windows Installation ~
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YCM has **no official support for Windows**, but that doesn't mean you can't
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get it to work there. See the Windows Installation Guide [14] wiki page. Feel
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free to add to it.
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===============================================================================
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*youcompleteme-full-installation-guide*
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Full Installation Guide ~
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These are the steps necessary to get YCM working on a Unix OS like Linux or Mac
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OS X. My apologies to Windows users, but I don't have a guide for them. The
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code is platform agnostic, so if everything is configured correctly, YCM
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_should_ work on Windows without issues (but as of writing, it's untested on
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that platform).
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See the _FAQ_ if you have any issues.
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**Remember:** YCM is a plugin with a compiled component. If you **update** YCM
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using Vundle and the ycm_core library API has changed (happens rarely), YCM
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will notify you to recompile it. You should then rerun the install process.
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**Please follow the instructions carefully. Read EVERY WORD.**
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1. **Ensure that your version of Vim is _at least_ 7.3.584 _and_ that it has
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support for python2 scripting**.
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Inside Vim, type ':version'. Look at the first two to three lines of
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output; it should say 'Vi IMproved 7.3' and then below that, 'Included
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patches: 1-X', where X will be some number. That number needs to be 584
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or higher.
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If your version of Vim is not recent enough, you may need to compile Vim
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from source [13] (don't worry, it's easy).
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After you have made sure that you have Vim 7.3.584+, type the following
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in Vim: ":echo has('python')". The output should be 1. If it's 0, then
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get a version of Vim with Python support.
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2. **Install YCM** with Vundle [10] (or Pathogen [15], but Vundle is a
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better idea). With Vundle, this would mean adding a "Bundle
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'Valloric/YouCompleteMe'" line to your vimrc [16].
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3. [Complete this step ONLY if you care about semantic completion support
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for C-family languages. Otherwise it's not neccessary.]
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**Download the latest version of 'libclang'**. Clang is an open-source
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compiler that can compile C/C++/Objective-C/Objective-C++. The 'libclang'
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library it provides is used to power the YCM semantic completion engine
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for those languages. YCM needs libclang version 3.2 or higher.
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You can use the system libclang _only if you are sure it is version 3.2
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or higher_, otherwise don't. Even if it is, I recommend using the
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official binaries from llvm.org [17] if at all possible. Make sure you
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download the correct archive file for your OS.
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4. **Compile the 'ycm_core' plugin plugin** (ha!) that YCM needs. This is
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the C++ engine that YCM uses to get fast completions.
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You will need to have 'cmake' installed in order to generate the required
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makefiles. Linux users can install cmake with their package manager
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('sudo apt-get install cmake' for Ubuntu) whereas other users can
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download and install [12] cmake from its project site. Mac users can also
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get it through Homebrew [11] with 'brew install cmake'.
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You also need to make sure you have Python headers installed. On a
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Debian-like Linux distro, this would be 'sudo apt-get install python-
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dev'. On Mac they should already be present.
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Here we'll assume you installed YCM with Vundle. That means that the top-
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level YCM directory is in '~/.vim/bundle/YouCompleteMe'.
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We'll create a new folder where build files will be placed. Run the
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following:
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>
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cd ~
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mkdir ycm_build
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cd ycm_build
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<
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Now we need to generate the makefiles. If you DON'T care about semantic
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support for C-family languages, run the following command in the
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'ycm_build' directory: 'cmake -G "Unix Makefiles" .
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~/.vim/bundle/YouCompleteMe/cpp'
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If you DO care about semantic support for C-family languages, then your
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'cmake' call will be a bit more complicated. We'll assume you downloaded
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a binary distribution of LLVM+Clang from llvm.org in step 3 and that you
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extracted the archive file to folder '~/ycm_temp/llvm_root_dir' (with
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'bin', 'lib', 'include' etc. folders right inside that folder). With that
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in mind, run the following command in the 'ycm_build' directory: 'cmake
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-G "Unix Makefiles" -DPATH_TO_LLVM_ROOT=~/ycm_temp/llvm_root_dir .
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~/.vim/bundle/YouCompleteMe/cpp'
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Now that makefiles have been generated, simply run 'make ycm_core'.
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For those who want to use the system version of libclang, you would pass
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'-DUSE_SYSTEM_LIBCLANG=ON' to cmake _instead of_ the
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'-DPATH_TO_LLVM_ROOT=...' flag.
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You could also force the use of a custom libclang library with
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'-DEXTERNAL_LIBCLANG_PATH=/path/to/libclang.so' flag (the library would
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end with '.dylib' on a Mac). Again, this flag would be used _instead of_
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the other flags.
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Running the 'make' command will also place the 'libclang.[so|dylib]' in
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the 'YouCompleteMe/python' folder for you if you compiled with clang
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support (it needs to be there for YCM to work).
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That's it. You're done. Refer to the _User Guide_ section on how to use YCM.
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Don't forget that if you want the C-family semantic completion engine to work,
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you will need to provide the compilation flags for your project to YCM. It's
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all in the User Guide.
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YCM comes with sane defaults for its options, but you still may want to take a
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look at what's available for configuration. There are a few interesting options
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that are conservatively turned off by default that you may want to turn on.
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===============================================================================
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*youcompleteme-user-guide*
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User Guide ~
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-------------------------------------------------------------------------------
|
|
*youcompleteme-general-usage*
|
|
General Usage ~
|
|
|
|
- If the offered completions are too broad, keep typing characters; YCM will
|
|
continue refining the offered completions based on your input.
|
|
|
|
- Filtering is "smart-case" sensitive; if you are typing only lowercase
|
|
letters, then it's case-insensitive. If your input involves uppercase
|
|
letters, then it's case-sensitive. So "foo" matches "Foo" and "foo", but
|
|
"Foo" matches "Foo" but not "foo".
|
|
|
|
- Use the TAB key to accept a completion and continue pressing TAB to cycle
|
|
through the completions. Use Shift-TAB to cycle backwards. Note that if
|
|
you're using console Vim (that is, not Gvim or MacVim) then it's likely
|
|
that the Shift-TAB binding will not work because the console will not pass
|
|
it to Vim. You can remap the keys; see the _Options_ section below.
|
|
|
|
Knowing a little bit about how YCM works internally will prevent confusion. YCM
|
|
has several completion engines: an identifier-based completer that collects all
|
|
of the identifiers in the current file and other files you visit (and your tags
|
|
files) and searches them when you type (identifiers are put into per-filetype
|
|
groups).
|
|
|
|
There are also several semantic engines in YCM. There's a libclang-based
|
|
completer that provides semantic completion for C-family languages. There's a
|
|
Jedi-based completer for semantic completion for Python. There's also an
|
|
omnifunc-based completer that uses data from Vim's omnicomplete system to
|
|
provide semantic completions when no native completer exists for that language
|
|
in YCM.
|
|
|
|
There are also other completion engines, like the UltiSnips completer and the
|
|
filepath completer.
|
|
|
|
YCM automatically detects which completion engine would be the best in any
|
|
situation. On occasion, it queries several of them at once, merges the outputs
|
|
and presents the results to you.
|
|
|
|
-------------------------------------------------------------------------------
|
|
*youcompleteme-completion-string-ranking*
|
|
Completion string ranking ~
|
|
|
|
The subsequence filter removes any completions that do not match the input, but
|
|
then the sorting system kicks in. It's actually very complicated and uses lots
|
|
of factors, but suffice it to say that "word boundary" (WB) subsequence
|
|
character matches are "worth" more than non-WB matches. In effect, this means
|
|
given an input of "gua", the completion "getUserAccount" would be ranked higher
|
|
in the list than the "Fooguxa" completion (both of which are subsequence
|
|
matches). A word-boundary character are all capital characters, characters
|
|
preceded by an underscore and the first letter character in the completion
|
|
string.
|
|
|
|
-------------------------------------------------------------------------------
|
|
*youcompleteme-general-semantic-completion-engine-usage*
|
|
General Semantic Completion Engine Usage ~
|
|
|
|
- You can use Ctrl+Space to trigger the completion suggestions anywhere, even
|
|
without a string prefix. This is useful to see which top-level functions
|
|
are available for use.
|
|
|
|
-------------------------------------------------------------------------------
|
|
*youcompleteme-c-family-semantic-completion-engine-usage*
|
|
C-family Semantic Completion Engine Usage ~
|
|
|
|
- You _really_ also want to install the latest version of the Syntastic [7]
|
|
Vim plugin. It has support for YCM and together they will provide you with
|
|
compile errors/warnings practically instantly and without saving the file.
|
|
|
|
YCM looks for a '.ycm_extra_conf.py' file in the directory of the opened file
|
|
or in any directory above it in the hierarchy (recursively); when the file is
|
|
found, it is loaded (only once!) as a Python module. YCM calls a 'FlagsForFile'
|
|
method in that module which should provide it with the information necessary to
|
|
compile the current file. You can also provide a path to a global
|
|
'.ycm_extra_conf.py' file, which will be used as a fallback. To prevent the
|
|
execution of malicious code from a file you didn't write YCM will ask you once
|
|
per '.ycm_extra_conf.py' if it is safe to load. This can be disabled and you
|
|
can white-/blacklist files. See the _Options_ section for more details.
|
|
|
|
This system was designed this way so that the user can perform any arbitrary
|
|
sequence of operations to produce a list of compilation flags YCM should hand
|
|
to Clang.
|
|
|
|
See YCM's own '.ycm_extra_conf.py' [18] for details on how this works. You
|
|
should be able to use it _as a starting point_. **Don't** just copy/paste that
|
|
file somewhere and expect things to magically work; **your project needs
|
|
different flags**. Hint: just replace the strings in the 'flags' variable with
|
|
compilation flags necessary for your project. That should be enough for 99% of
|
|
projects.
|
|
|
|
Yes, Clang's 'CompilationDatabase' system [19] is also supported. Again, see
|
|
the above linked example file.
|
|
|
|
If Clang encounters errors when compiling the header files that your file
|
|
includes, then it's probably going to take a long time to get completions. When
|
|
the completion menu finally appears, it's going to have a large number of
|
|
unrelated completion strings (type/function names that are not actually
|
|
members). This is because Clang fails to build a precompiled preamble for your
|
|
file if there are any errors in the included headers and that preamble is key
|
|
to getting fast completions.
|
|
|
|
Call the ':YcmDiags' command to see if any errors or warnings were detected in
|
|
your file. Even better, use Syntastic.
|
|
|
|
-------------------------------------------------------------------------------
|
|
*youcompleteme-python-semantic-completion*
|
|
Python semantic completion ~
|
|
|
|
YCM uses Jedi [4] to power its semantic completion for Python. This should
|
|
"just work" without any configuration from the user. You do NOT need to install
|
|
Jedi yourself; YCM uses it as a git subrepo. If you're installing YCM with
|
|
Vundle (which is the recommended way) then Vundle will make sure that the
|
|
subrepo is checked out when you do ':BundleInstall'. If you're installing YCM
|
|
by hand, then you need to run 'git submodule update --init --recursive' when
|
|
you're checking out the YCM repository. That's it.
|
|
|
|
But again, installing YCM with Vundle takes care of all of this for you.
|
|
|
|
In the future expect to see features like go-to-definition for Python as well.
|
|
|
|
-------------------------------------------------------------------------------
|
|
*youcompleteme-semantic-completion-for-other-languages*
|
|
Semantic completion for other languages ~
|
|
|
|
YCM will use your 'omnifunc' (see ':h omnifunc' in Vim) as a source for
|
|
semantic completions if it does not have a native semantic completion engine
|
|
for your file's filetype. Vim comes with okayish omnifuncs for various
|
|
languages like Ruby, PHP etc. It depends on the language.
|
|
|
|
You can get stellar omnifuncs for Java and Ruby with Eclim [20]. Just make sure
|
|
you have the _latest_ Eclim installed and configured (this means Eclim '>=
|
|
2.2.*' and Eclipse '>= 4.2.*').
|
|
|
|
After installing Eclim remember to create a new Eclipse project within your
|
|
application by typing ':ProjectCreate <path-to-your-project> -n ruby' (or '-n
|
|
java') inside vim and don't forget to have "let g:EclimCompletionMethod =
|
|
'omnifunc'" in your vimrc. This will make YCM and Eclim play nice; YCM will use
|
|
Eclim's omnifuncs as the data source for semantic completions and provide the
|
|
auto-triggering and subsequence-based matching (and other YCM features) on top
|
|
of it.
|
|
|
|
-------------------------------------------------------------------------------
|
|
*youcompleteme-writing-new-semantic-completers*
|
|
Writing New Semantic Completers ~
|
|
|
|
You have two options here: writing an 'omnifunc' for Vim's omnicomplete system
|
|
that YCM will then use through its omni-completer, or a custom completer for
|
|
YCM using the Completer API [21].
|
|
|
|
Here are the differences between the two approaches:
|
|
|
|
- You have to use VimScript to write the omnifunc, but get to use Python to
|
|
write for the Completer API; this by itself should make you want to use the
|
|
API.
|
|
|
|
- The Completer API is a _much_ more powerful way to integrate with YCM and
|
|
it provides a wider set of features. For instance, you can make your
|
|
Completer query your semantic back-end in an asynchronous fashion, thus not
|
|
blocking Vim's GUI thread while your completion system is processing stuff.
|
|
This is impossible with VimScript. All of YCM's completers use the
|
|
Completer API.
|
|
|
|
- Performance with the Completer API is better since Python executes faster
|
|
than VimScript.
|
|
|
|
If you want to use the 'omnifunc' system, see the relevant Vim docs with ':h
|
|
complete-functions'. For the Completer API, see the API docs [21].
|
|
|
|
If you want to upstream your completer into YCM's source, you should use the
|
|
Completer API.
|
|
|
|
-------------------------------------------------------------------------------
|
|
*youcompleteme-syntastic-integration*
|
|
Syntastic integration ~
|
|
|
|
YCM has explicit support for Syntastic [7] (and vice-versa) if you compiled YCM
|
|
with Clang support; this means that any diagnostics (errors or warnings) that
|
|
Clang encounters while compiling your file will be fed back to Syntastic for
|
|
display.
|
|
|
|
YCM will recompile your file in the background 'updatetime' (see ':h
|
|
updatetime' in Vim) milliseconds after you stop typing (to be specific, on
|
|
'CursorHold' and 'CursorHoldI' Vim events). YCM will change your 'updatetime'
|
|
value to be '2000' milliseconds (there's an option to tell it not to do this if
|
|
you wish).
|
|
|
|
The new diagnostics (if any) will be fed back to Syntastic the next time you
|
|
press any key on the keyboard. So if you stop typing and just wait for the new
|
|
diagnostics to come in, that _will not work_. You need to press some key for
|
|
the GUI to update.
|
|
|
|
Having to press a key to get the updates is unfortunate, but cannot be changed
|
|
due to the way Vim internals operate; there is no way that a background task
|
|
can update Vim's GUI after it has finished running. You _have to_ press a key.
|
|
This will make YCM check for any pending diagnostics updates.
|
|
|
|
You _can_ force a full, blocking compilation cycle with the
|
|
':YcmForceCompileAndDiagnostics' command (you may want to map that command to a
|
|
key; try putting 'nnoremap <F5> :YcmForceCompileAndDiagnostics<CR>' in your
|
|
vimrc). Calling this command will force YCM to immediately recompile your file
|
|
and display any new diagnostics it encounters. Do note that recompilation with
|
|
this command may take a while and during this time the Vim GUI _will_ be
|
|
blocked.
|
|
|
|
After the errors are displayed by Syntastic, it will display a short diagnostic
|
|
message when you move your cursor to the line with the error. You can get a
|
|
detailed diagnostic message with the '<leader>d' key mapping (can be changed in
|
|
the options) YCM provides when your cursor is on the line with the diagnostic.
|
|
|
|
You can also see the full diagnostic message for all the diagnostics in the
|
|
current file in Vim's 'locationlist', which can be opened with the ':lopen' and
|
|
':lclose' commands (make sure you have set 'let
|
|
g:syntastic_always_populate_loc_list = 1' in your vimrc). A good way to toggle
|
|
the display of the 'locationlist' with a single key mapping is provided by
|
|
another (very small) Vim plugin called ListToggle [22] (which also makes it
|
|
possible to change the height of the 'locationlist' window), also written by
|
|
yours truly.
|
|
|
|
===============================================================================
|
|
*youcompleteme-commands*
|
|
Commands ~
|
|
|
|
-------------------------------------------------------------------------------
|
|
The '*:YcmForceCompileAndDiagnostics*' command
|
|
|
|
Calling this command will force YCM to immediately recompile your file and
|
|
display any new diagnostics it encounters. Do note that recompilation with this
|
|
command may take a while and during this time the Vim GUI _will_ be blocked.
|
|
|
|
You may want to map this command to a key; try putting 'nnoremap <F5>
|
|
:YcmForceCompileAndDiagnostics<CR>' in your vimrc.
|
|
|
|
-------------------------------------------------------------------------------
|
|
The '*:YcmDiags*' command
|
|
|
|
Calling this command will fill Vim's 'locationlist' with errors or warnings if
|
|
any were detected in your file and then open it.
|
|
|
|
A better option would be to use Syntastic which will keep your 'locationlist'
|
|
up to date automatically and will also show error/warning notifications in
|
|
Vim's gutter.
|
|
|
|
-------------------------------------------------------------------------------
|
|
The '*:YcmShowDetailedDiagnostic*' command
|
|
|
|
This command shows the full diagnostic text when the user's cursor is on the
|
|
line with the diagnostic.
|
|
|
|
-------------------------------------------------------------------------------
|
|
The '*:YcmDebugInfo*' command
|
|
|
|
This will print out various debug information for the current file. Useful to
|
|
see what compile commands will be used for the file if you're using the
|
|
semantic completion engine.
|
|
|
|
-------------------------------------------------------------------------------
|
|
The '*:YcmCompleter*' command
|
|
|
|
This command can be used to invoke completer-specific commands. If the first
|
|
argument is of the form 'ft=...' the completer for that file type will be used
|
|
(for example 'ft=cpp'), else the native completer of the current buffer will be
|
|
used. Call 'YcmCompleter' without further arguments for information about the
|
|
commands you can call for the selected completer.
|
|
|
|
See the _YcmCompleter subcommands_ section for more information on the
|
|
available subcommands.
|
|
|
|
===============================================================================
|
|
*youcompleteme-ycmcompleter-subcommands*
|
|
YcmCompleter subcommands ~
|
|
|
|
[See the docs for the 'YcmCompleter' command before tackling this section.]
|
|
|
|
The invoked subcommand is automatically routed to the currently active semantic
|
|
completer, so ':YcmCompleter GoToDefinition' will invoke the 'GoToDefinition'
|
|
subcommand on the Python semantic completer if the currently active file is a
|
|
Python one and on the Clang completer if the currently active file is a
|
|
C/C++/Objective-C one.
|
|
|
|
You may also want to map the subcommands to something less verbose; for
|
|
instance, 'nnoremap <leader>jd :YcmCompleter GoToDefinitionElseDeclaration<CR>'
|
|
maps the '<leader>jd' sequence to the longer subcommand invocation.
|
|
|
|
The various 'GoTo*' subcommands add entries to Vim's 'jumplist' so you can use
|
|
'CTRL-O' to jump back to where you where before invoking the command (and
|
|
'CTRL-I' to jump forward; see ':h jumplist' for details).
|
|
|
|
-------------------------------------------------------------------------------
|
|
The '*GoToDeclaration*' subcommand
|
|
|
|
Looks up the symbol under the cursor and jumps to its declaration.
|
|
|
|
Supported in filetypes: 'c, cpp, objc, objcpp, python'
|
|
|
|
-------------------------------------------------------------------------------
|
|
The '*GoToDefinition*' subcommand
|
|
|
|
Looks up the symbol under the cursor and jumps to its definition.
|
|
|
|
NOTE: For C-family languages **this only works in certain situations**, namely
|
|
when the definition of the symbol is in the current translation unit. A
|
|
translation unit consists of the file you are editing and all the files you are
|
|
including with '#include' directives (directly or indirectly) in that file.
|
|
|
|
Supported in filetypes: 'c, cpp, objc, objcpp, python'
|
|
|
|
-------------------------------------------------------------------------------
|
|
The '*GoToDefinitionElseDeclaration*' subcommand
|
|
|
|
Looks up the symbol under the cursor and jumps to its definition if possible;
|
|
if the definition is not accessible from the current translation unit, jumps to
|
|
the symbol's declaration.
|
|
|
|
Supported in filetypes: 'c, cpp, objc, objcpp, python'
|
|
|
|
-------------------------------------------------------------------------------
|
|
The '*ClearCompilationFlagCache*' subcommand
|
|
|
|
YCM caches the flags it gets from the 'FlagsForFile' function in your
|
|
'ycm_extra_conf.py' file if you return them with the 'do_cache' parameter set
|
|
to 'True'. The cache is in memory and is never invalidated (unless you restart
|
|
Vim of course).
|
|
|
|
This command clears that cache entirely. YCM will then re-query your
|
|
'FlagsForFile' function as needed in the future.
|
|
|
|
Supported in filetypes: 'c, cpp, objc, objcpp'
|
|
|
|
===============================================================================
|
|
*youcompleteme-options*
|
|
Options ~
|
|
|
|
All options have reasonable defaults so if the plug-in works after installation
|
|
you don't need to change any options. These options can be configured in your
|
|
vimrc script [16] by including a line like this:
|
|
>
|
|
let g:ycm_min_num_of_chars_for_completion = 1
|
|
<
|
|
Note that after changing an option in your vimrc script [16] you have to
|
|
restart Vim for the changes to take effect.
|
|
|
|
-------------------------------------------------------------------------------
|
|
The '*g:ycm_min_num_of_chars_for_completion*' option
|
|
|
|
This option controls the number of characters the user needs to type before
|
|
identifier-based completion suggestions are triggered. For example, if the
|
|
option is set to '2', then when the user types a second alphanumeric character
|
|
after a whitespace character, completion suggestions will be triggered. This
|
|
option is NOT used for semantic completion.
|
|
|
|
Setting this option to a high number like '99' effectively turns off the
|
|
identifier completion engine and just leaves the semantic engine.
|
|
|
|
Default: '2'
|
|
>
|
|
let g:ycm_min_num_of_chars_for_completion = 2
|
|
<
|
|
-------------------------------------------------------------------------------
|
|
The '*g:ycm_filetype_whitelist*' option
|
|
|
|
This option controls for which Vim filetypes (see ':h filetype') should YCM be
|
|
turned on. The option value should be a Vim dictionary with keys being filetype
|
|
strings (like 'python', 'cpp' etc) and values being unimportant (the dictionary
|
|
is used like a hash set, meaning that only the keys matter).
|
|
|
|
The '*' key is special and matches all filetypes. By default, the whitelist
|
|
contains only this '*' key.
|
|
|
|
YCM also has a 'g:ycm_filetype_blacklist' option that lists filetypes for which
|
|
YCM shouldn't be turned on. YCM will work only in filetypes that both the
|
|
whitelist and the blacklist allow (the blacklist "allows" a filetype by _not_
|
|
having it as a key).
|
|
|
|
For example, let's assume you want YCM to work in files with the 'cpp'
|
|
filetype. The filetype should then be present in the whitelist either directly
|
|
('cpp' key in the whitelist) or indirectly through the special '*' key. It
|
|
should _not_ be present in the blacklist.
|
|
|
|
Filetypes that are blocked by the either of the lists will be completely
|
|
ignored by YCM, meaning that neither the identifier-based completion engine nor
|
|
the semantic engine will operate in them.
|
|
|
|
You can get the filetype of the current file in Vim with ':set ft?'.
|
|
|
|
Default: "{'*' : 1}"
|
|
>
|
|
let g:ycm_filetype_whitelist = { '*': 1 }
|
|
<
|
|
-------------------------------------------------------------------------------
|
|
The '*g:ycm_filetype_blacklist*' option
|
|
|
|
This option controls for which Vim filetypes (see ':h filetype') should YCM be
|
|
turned off. The option value should be a Vim dictionary with keys being
|
|
filetype strings (like 'python', 'cpp' etc) and values being unimportant (the
|
|
dictionary is used like a hash set, meaning that only the keys matter).
|
|
|
|
See the 'g:ycm_filetype_whitelist' option for more details on how this works.
|
|
|
|
Default: "{'notes': 1, 'markdown': 1, 'text': 1}"
|
|
>
|
|
let g:ycm_filetype_blacklist = {
|
|
\ 'notes' : 1,
|
|
\ 'markdown' : 1,
|
|
\ 'text' : 1,
|
|
\}
|
|
<
|
|
-------------------------------------------------------------------------------
|
|
The '*g:ycm_filetype_specific_completion_to_disable*' option
|
|
|
|
This option controls for which Vim filetypes (see ':h filetype') should the YCM
|
|
semantic completion engine be turned off. The option value should be a Vim
|
|
dictionary with keys being filetype strings (like 'python', 'cpp' etc) and
|
|
values being unimportant (the dictionary is used like a hash set, meaning that
|
|
only the keys matter). The listed filetypes will be ignored by the YCM semantic
|
|
completion engine, but the identifier-based completion engine will still
|
|
trigger in files of those filetypes.
|
|
|
|
Note that even if semantic completion is not turned off for a specific
|
|
filetype, you will not get semantic completion if the semantic engine does not
|
|
support that filetype.
|
|
|
|
You can get the filetype of the current file in Vim with ':set ft?'.
|
|
|
|
Default: '{}'
|
|
>
|
|
let g:ycm_filetype_specific_completion_to_disable = {}
|
|
<
|
|
-------------------------------------------------------------------------------
|
|
The '*g:ycm_register_as_syntastic_checker*' option
|
|
|
|
When set, this option makes YCM register itself as the Syntastic checker for
|
|
the 'c', 'cpp', 'objc' and 'objcpp' filetypes. This enables the YCM-Syntastic
|
|
integration.
|
|
|
|
If you're using YCM's identifier completer in C-family languages but cannot use
|
|
the clang-based semantic completer for those languages _and_ want to use the
|
|
GCC Syntastic checkers, unset this option.
|
|
|
|
Don't unset this option unless you're sure you know what you're doing.
|
|
|
|
Default: '1'
|
|
>
|
|
let g:ycm_register_as_syntastic_checker = 1
|
|
<
|
|
-------------------------------------------------------------------------------
|
|
The '*g:ycm_allow_changing_updatetime*' option
|
|
|
|
When this option is set to '1', YCM will change the 'updatetime' Vim option to
|
|
'2000' (see ':h updatetime'). This may conflict with some other plugins you
|
|
have (but it's unlikely). The 'updatetime' option is the number of milliseconds
|
|
that have to pass before Vim's 'CursorHold' (see ':h CursorHold') event fires.
|
|
YCM runs the completion engines' "file comprehension" systems in the background
|
|
on every such event; the identifier-based engine collects the identifiers
|
|
whereas the semantic engine compiles the file to build an AST.
|
|
|
|
The Vim default of '4000' for 'updatetime' is a bit long, so YCM reduces this.
|
|
Set this option to '0' to force YCM to leave your 'updatetime' setting alone.
|
|
|
|
Default: '1'
|
|
>
|
|
let g:ycm_allow_changing_updatetime = 1
|
|
<
|
|
-------------------------------------------------------------------------------
|
|
The '*g:ycm_complete_in_comments*' option
|
|
|
|
When this option is set to '1', YCM will show the completion menu even when
|
|
typing inside comments.
|
|
|
|
Default: '0'
|
|
>
|
|
let g:ycm_complete_in_comments = 0
|
|
<
|
|
-------------------------------------------------------------------------------
|
|
The '*g:ycm_complete_in_strings*' option
|
|
|
|
When this option is set to '1', YCM will show the completion menu even when
|
|
typing inside strings.
|
|
|
|
Note that this is turned on by default so that you can use the filename
|
|
completion inside strings. This is very useful for instance in C-family files
|
|
where typing '#include "' will trigger the start of filename completion. If you
|
|
turn off this option, you will turn off filename completion in such situations
|
|
as well.
|
|
|
|
Default: '1'
|
|
>
|
|
let g:ycm_complete_in_strings = 1
|
|
<
|
|
-------------------------------------------------------------------------------
|
|
The '*g:ycm_collect_identifiers_from_comments_and_strings*' option
|
|
|
|
When this option is set to '1', YCM's identifier completer will also collect
|
|
identifiers from strings and comments. Otherwise, the text in comments and
|
|
strings will be ignored.
|
|
|
|
Default: '0'
|
|
>
|
|
let g:ycm_collect_identifiers_from_comments_and_strings = 0
|
|
<
|
|
-------------------------------------------------------------------------------
|
|
The '*g:ycm_collect_identifiers_from_tags_files*' option
|
|
|
|
When this option is set to '1', YCM's identifier completer will also collect
|
|
identifiers from tags files. The list of tags files to examine is retrieved
|
|
from the 'tagfiles()' Vim function which examines the 'tags' Vim option. See
|
|
":h 'tags'" for details.
|
|
|
|
YCM will re-index your tags files if it detects that they have been modified.
|
|
|
|
The only supported tag format is the Exuberant Ctags format [23]. The format
|
|
from "plain" ctags is NOT supported. Ctags needs to be called with the '--
|
|
fields=+l' option (that's a lowercase 'L', not a one) because YCM needs the
|
|
'language:<lang>' field in the tags output.
|
|
|
|
See the _FAQ_ for pointers if YCM does not appear to read your tag files.
|
|
|
|
This option is off by default because it makes Vim slower if your tags are on a
|
|
network directory.
|
|
|
|
Default: '0'
|
|
>
|
|
let g:ycm_collect_identifiers_from_tags_files = 0
|
|
<
|
|
-------------------------------------------------------------------------------
|
|
The '*g:ycm_seed_identifiers_with_syntax*' option
|
|
|
|
When this option is set to '1', YCM's identifier completer will seed its
|
|
identifier database with the keywords of the programming language you're
|
|
writing.
|
|
|
|
Since the keywords are extracted from the Vim syntax file for the filetype, all
|
|
keywords may not be collected, depending on how the syntax file was written.
|
|
Usually at least 95% of the keywords are successfully extracted.
|
|
|
|
Default: '0'
|
|
>
|
|
let g:ycm_seed_identifiers_with_syntax = 0
|
|
<
|
|
-------------------------------------------------------------------------------
|
|
The '*g:ycm_add_preview_to_completeopt*' option
|
|
|
|
When this option is set to '1', YCM will add the 'preview' string to Vim's
|
|
'completeopt' option (see ':h completeopt'). If your 'completeopt' option
|
|
already has 'preview' set, there will be no effect. You can see the current
|
|
state of your 'completeopt' setting with ':set completeopt?' (yes, the question
|
|
mark is important).
|
|
|
|
When 'preview' is present in 'completeopt', YCM will use the 'preview' window
|
|
at the top of the file to store detailed information about the current
|
|
completion candidate (but only if the candidate came from the semantic engine).
|
|
For instance, it would show the full function prototype and all the function
|
|
overloads in the window if the current completion is a function name.
|
|
|
|
Default: '0'
|
|
>
|
|
let g:ycm_add_preview_to_completeopt = 0
|
|
<
|
|
-------------------------------------------------------------------------------
|
|
The '*g:ycm_autoclose_preview_window_after_completion*' option
|
|
|
|
When this option is set to '1', YCM will auto-close the 'preview' window after
|
|
the user accepts the offered completion string. If there is no 'preview' window
|
|
triggered because there is no 'preview' string in 'completeopt', this option is
|
|
irrelevant. See the 'g:ycm_add_preview_to_completeopt' option for more details.
|
|
|
|
Default: '0'
|
|
>
|
|
let g:ycm_autoclose_preview_window_after_completion = 0
|
|
<
|
|
-------------------------------------------------------------------------------
|
|
The '*g:ycm_autoclose_preview_window_after_insertion*' option
|
|
|
|
When this option is set to '1', YCM will auto-close the 'preview' window after
|
|
the user leaves insert mode. This option is irrelevant if
|
|
'g:ycm_autoclose_preview_window_after_completion' is set or if no 'preview'
|
|
window is triggered. See the 'g:ycm_add_preview_to_completeopt' option for more
|
|
details.
|
|
|
|
Default: '0'
|
|
>
|
|
let g:ycm_autoclose_preview_window_after_insertion = 0
|
|
<
|
|
-------------------------------------------------------------------------------
|
|
The '*g:ycm_max_diagnostics_to_display*' option
|
|
|
|
This option controls the maximum number of diagnostics shown to the user when
|
|
errors or warnings are detected in the file. This option is only relevant if
|
|
you are using the semantic completion engine and have installed the version of
|
|
the Syntastic plugin that supports YCM.
|
|
|
|
Default: '30'
|
|
>
|
|
let g:ycm_max_diagnostics_to_display = 30
|
|
<
|
|
-------------------------------------------------------------------------------
|
|
The '*g:ycm_key_list_select_completion*' option
|
|
|
|
This option controls the key mappings used to select the first completion
|
|
string. Invoking any of them repeatedly cycles forward through the completion
|
|
list.
|
|
|
|
Some users like adding '<Enter>' to this list.
|
|
|
|
Default: "['<TAB>', '<Down>']"
|
|
>
|
|
let g:ycm_key_list_select_completion = ['<TAB>', '<Down>']
|
|
<
|
|
-------------------------------------------------------------------------------
|
|
The '*g:ycm_key_list_previous_completion*' option
|
|
|
|
This option controls the key mappings used to select the previous completion
|
|
string. Invoking any of them repeatedly cycles backwards through the completion
|
|
list.
|
|
|
|
Note that one of the defaults is '<S-TAB>' which means Shift-TAB. That mapping
|
|
will probably only work in GUI Vim (Gvim or MacVim) and not in plain console
|
|
Vim because the terminal usually does not forward modifier key combinations to
|
|
Vim.
|
|
|
|
Default: "['<S-TAB>', '<Up>']"
|
|
>
|
|
let g:ycm_key_list_previous_completion = ['<S-TAB>', '<Up>']
|
|
<
|
|
-------------------------------------------------------------------------------
|
|
The '*g:ycm_key_invoke_completion*' option
|
|
|
|
This option controls the key mapping used to invoke the completion menu for
|
|
semantic completion. By default, semantic completion is trigged automatically
|
|
after typing '.', '->' and '::' in insert mode (if semantic completion support
|
|
has been compiled in). This key mapping can be used to trigger semantic
|
|
completion anywhere. Useful for searching for top-level functions and classes.
|
|
|
|
Console Vim (not Gvim or MacVim) passes '<Nul>' to Vim when the user types
|
|
'<C-Space>' so YCM will make sure that '<Nul>' is used in the map command when
|
|
you're editing in console Vim, and '<C-Space>' in GUI Vim. This means that you
|
|
can just press '<C-Space>' in both console and GUI Vim and YCM will do the
|
|
right thing.
|
|
|
|
Setting this option to an empty string will make sure no mapping is created.
|
|
|
|
Default: '<C-Space>'
|
|
>
|
|
let g:ycm_key_invoke_completion = '<C-Space>'
|
|
<
|
|
-------------------------------------------------------------------------------
|
|
The '*g:ycm_key_detailed_diagnostics*' option
|
|
|
|
This option controls the key mapping used to show the full diagnostic text when
|
|
the user's cursor is on the line with the diagnostic. It basically calls
|
|
':YcmShowDetailedDiagnostic'.
|
|
|
|
Setting this option to an empty string will make sure no mapping is created.
|
|
|
|
Default: '<leader>d'
|
|
>
|
|
let g:ycm_key_detailed_diagnostics = '<leader>d'
|
|
<
|
|
-------------------------------------------------------------------------------
|
|
The '*g:ycm_global_ycm_extra_conf*' option
|
|
|
|
Normally, YCM searches for a '.ycm_extra_conf.py' file for compilation flags
|
|
(see the User Guide for more details on how this works). This option specifies
|
|
a fallback path to a config file which is used if no '.ycm_extra_conf.py' is
|
|
found.
|
|
|
|
You can place such a global file anywhere in your filesystem.
|
|
|
|
Default: "''"
|
|
>
|
|
let g:ycm_global_ycm_extra_conf = ''
|
|
<
|
|
-------------------------------------------------------------------------------
|
|
The '*g:ycm_confirm_extra_conf*' option
|
|
|
|
When this option is set to '1' YCM will ask once per '.ycm_extra_conf.py' file
|
|
if it is safe to be loaded. This is to prevent execution of malicious code from
|
|
a '.ycm_extra_conf.py' file you didn't write.
|
|
|
|
Default: '1'
|
|
>
|
|
let g:ycm_confirm_extra_conf = 1
|
|
<
|
|
-------------------------------------------------------------------------------
|
|
The '*g:ycm_extra_conf_globlist*' option
|
|
|
|
This option is a list that may contain several globbing patterns. If a pattern
|
|
starts with a '!' all '.ycm_extra_conf.py' files matching that pattern will be
|
|
blacklisted, that is they won't be loaded and no confirmation dialog will be
|
|
shown. If a pattern does not start with a '!' all files matching that pattern
|
|
will be whitelisted. Note that this option is not used when confirmation is
|
|
disabled using 'g:ycm_confirm_extra_conf' and that items earlier in the list
|
|
will take precedence over the later ones.
|
|
|
|
Rules:
|
|
|
|
- '*' matches everything
|
|
- '?' matches any single character
|
|
- '[seq]' matches any character in seq
|
|
- '[!seq]' matches any char not in seq
|
|
|
|
Example:
|
|
>
|
|
let g:ycm_extra_conf_globlist = ['~/dev/*','!~/*']
|
|
<
|
|
- The first rule will match everything contained in the '~/dev' directory so
|
|
'.ycm_extra_conf.py' files from there will be loaded.
|
|
|
|
- The second rule will match everything in the home directory so a
|
|
'.ycm_extra_conf.py' file from there won't be loaded.
|
|
|
|
- As the first rule takes precedence everything in the home directory
|
|
excluding the '~/dev' directory will be blacklisted.
|
|
|
|
Default: '[]'
|
|
>
|
|
let g:ycm_extra_conf_globlist = []
|
|
<
|
|
-------------------------------------------------------------------------------
|
|
The '*g:ycm_filepath_completion_use_working_dir*' option
|
|
|
|
By default, YCM's filepath completion will interpret relative paths like '../'
|
|
as being relative to the folder of the file of the currently active buffer.
|
|
Setting this option will force YCM to always interpret relative paths as being
|
|
relative to Vim's current working directory.
|
|
|
|
Default: '0'
|
|
>
|
|
let g:ycm_filepath_completion_use_working_dir = 0
|
|
<
|
|
-------------------------------------------------------------------------------
|
|
The '*g:ycm_semantic_triggers*' option
|
|
|
|
This option controls the character-based triggers for the various semantic
|
|
completion engines. The option holds a dictionary of key-values, where the keys
|
|
are Vim's filetype strings delimited by commas and values are lists of strings,
|
|
where the strings are the triggers.
|
|
|
|
A "trigger" is a sequence of one or more characters that trigger semantic
|
|
completion when typed. For instance, C++ ('cpp' filetype) has '.' listed as a
|
|
trigger. So when the user types 'foo.', the semantic engine will trigger and
|
|
serve 'foo''s list of member functions and variables. Since C++ also has '->'
|
|
listed as a trigger, the same thing would happen when the user typed 'foo->'.
|
|
|
|
Default: '[see next line]'
|
|
>
|
|
let g:ycm_semantic_triggers = {
|
|
\ 'c' : ['->', '.'],
|
|
\ 'objc' : ['->', '.'],
|
|
\ 'ocaml' : ['.', '#'],
|
|
\ 'cpp,objcpp' : ['->', '.', '::'],
|
|
\ 'perl' : ['->'],
|
|
\ 'php' : ['->', '::'],
|
|
\ 'cs,java,javascript,d,vim,ruby,python,perl6,scala,vb,elixir,go' : ['.'],
|
|
\ 'lua' : ['.', ':'],
|
|
\ 'erlang' : [':'],
|
|
\ }
|
|
<
|
|
-------------------------------------------------------------------------------
|
|
The '*g:ycm_cache_omnifunc*' option
|
|
|
|
Some omnicompletion engines do not work well with the YCM cache—in particular,
|
|
they might not produce all possible results for a given prefix. By unsetting
|
|
this option you can ensure that the omnicompletion engine is requeried on every
|
|
keypress. That will ensure all completions will be presented, but might cause
|
|
stuttering and lagginess if the omnifunc is slow.
|
|
|
|
Default: '1'
|
|
>
|
|
let g:ycm_cache_omnifunc = 1
|
|
<
|
|
===============================================================================
|
|
*youcompleteme-faq*
|
|
FAQ ~
|
|
|
|
-------------------------------------------------------------------------------
|
|
I get a linker warning regarding '*libpython*' on Mac when compiling YCM
|
|
|
|
If the warning is "ld: warning: path '/usr/lib/libpython2.7.dylib' following -L
|
|
not a directory", then feel free to ignore it; it's caused by a limitation of
|
|
CMake and is not an issue. Everything should still work fine.
|
|
|
|
-------------------------------------------------------------------------------
|
|
*youcompleteme-i-get-weird-window-at-top-of-my-file-when-i-use-semantic-engine*
|
|
I get a weird window at the top of my file when I use the semantic engine ~
|
|
|
|
This is Vim's 'preview' window. Vim uses it to show you extra information about
|
|
something if such information is available. YCM provides Vim with such extra
|
|
information. For instance, when you select a function in the completion list,
|
|
the 'preview' window will hold that function's prototype and the prototypes of
|
|
any overloads of the function. It will stay there after you select the
|
|
completion so that you can use the information about the parameters and their
|
|
types to write the function call.
|
|
|
|
If you would like this window to auto-close after you select a completion
|
|
string, set the 'g:ycm_autoclose_preview_window_after_completion' option to '1'
|
|
in your 'vimrc' file. Similarly, the
|
|
'g:ycm_autoclose_preview_window_after_insertion' option can be set to close the
|
|
'preview' window after leaving insert mode.
|
|
|
|
If you don't want this window to ever show up, add 'set completeopt-=preview'
|
|
to your 'vimrc'. Also make sure that the 'g:ycm_add_preview_to_completeopt'
|
|
option is set to '0'.
|
|
|
|
-------------------------------------------------------------------------------
|
|
*youcompleteme-it-appears-that-ycm-is-not-working*
|
|
It appears that YCM is not working ~
|
|
|
|
In Vim, run ':messages' and carefully read the output. YCM will echo messages
|
|
to the message log if it encounters problems. It's likely you misconfigured
|
|
something and YCM is complaining about it.
|
|
|
|
Also, you may want to run the ':YcmDebugInfo' command; it will make YCM spew
|
|
out various debugging information, including the compile flags for the file if
|
|
the file is a C-family language file and you have compiled in Clang support.
|
|
|
|
-------------------------------------------------------------------------------
|
|
*youcompleteme-i-cannot-get-syntastic-integration-to-work*
|
|
I cannot get the Syntastic integration to work ~
|
|
|
|
Try to update your version of Syntastic. At the time of writing (Jan 2013), the
|
|
YCM integration is very recent and it's likely that your version of Syntastic
|
|
does not have it.
|
|
|
|
-------------------------------------------------------------------------------
|
|
*youcompleteme-sometimes-it-takes-much-longer-to-get-semantic-completions-than-normal*
|
|
Sometimes it takes much longer to get semantic completions than normal ~
|
|
|
|
This means that libclang (which YCM uses for C-family semantic completion)
|
|
failed to pre-compile your file's preamble. In other words, there was an error
|
|
compiling some of the source code you pulled in through your header files. I
|
|
suggest calling the ':YcmDiags' command to see what they were (even better,
|
|
have Syntastic installed and call ':lopen').
|
|
|
|
Bottom line, if libclang can't pre-compile your file's preamble because there
|
|
were errors in it, you're going to get slow completions because there's no AST
|
|
cache.
|
|
|
|
-------------------------------------------------------------------------------
|
|
*youcompleteme-vim-flickers-every-time-i-move-cursor-or-moving-cursor-is-slow*
|
|
Vim flickers every time I move the cursor or moving the cursor is slow ~
|
|
|
|
You probably have an old version of Syntastic installed. If you are using
|
|
Vundle, make sure that your bundle command is "Bundle 'scrooloose/syntastic'"
|
|
and **not** "Bundle 'Syntastic'". The first command pulls in the latest version
|
|
of Syntastic from GitHub while the second one pulls in an old version from
|
|
vim.org.
|
|
|
|
-------------------------------------------------------------------------------
|
|
*youcompleteme-ycm-auto-inserts-completion-strings-i-dont-want*
|
|
YCM auto-inserts completion strings I don't want! ~
|
|
|
|
This means you probably have some mappings that interfere with YCM's internal
|
|
ones. Make sure you don't have something mapped to '<C-p>', '<C-x>' or '<C-u>'
|
|
(in insert mode).
|
|
|
|
YCM _never_ selects something for you; it just shows you a menu and the user
|
|
has to explicitly select something. If something is being selected
|
|
automatically, this means there's a bug or a misconfiguration somewhere.
|
|
|
|
-------------------------------------------------------------------------------
|
|
*E227:-mapping-already-exists-for-blah*
|
|
I get a 'E227: mapping already exists for <blah>' error when I start Vim ~
|
|
|
|
This means that YCM tried to set up a key mapping but failed because you
|
|
already had something mapped to that key combination. The '<blah>' part of the
|
|
message will tell you what was the key combination that failed.
|
|
|
|
Look in the _Options_ section and see if any of the default mappings conflict
|
|
with your own. Then change that option value to something else so that the
|
|
conflict goes away.
|
|
|
|
-------------------------------------------------------------------------------
|
|
*GLIBC_2.XX-not-found()*
|
|
I get "'GLIBC_2.XX' not found (required by libclang.so)" when starting Vim ~
|
|
|
|
Your system is too old for the precompiled binaries from llvm.org. Compile
|
|
Clang on your machine and then link against the 'libclang.so' you just
|
|
produced. See the full installation guide for help.
|
|
|
|
-------------------------------------------------------------------------------
|
|
*youcompleteme-im-trying-to-use-homebrew-vim-with-ycm-im-getting-segfaults*
|
|
I'm trying to use a Homebrew Vim with YCM and I'm getting segfaults ~
|
|
|
|
Something (I don't know what) is wrong with the way that Homebrew configures
|
|
and builds Vim. I recommend using MacVim [9]. Even if you don't like the MacVim
|
|
GUI, you can use the Vim binary that is inside the MacVim.app package (it's
|
|
'MacVim.app/Contents/MacOS/Vim') and get the Vim console experience.
|
|
|
|
-------------------------------------------------------------------------------
|
|
*youcompleteme-i-have-homebrew-python-and-or-macvim-cant-compile-sigabrt-when-starting*
|
|
I have a Homebrew Python and/or MacVim; can't compile/SIGABRT when starting ~
|
|
|
|
You should probably run 'brew rm python; brew install python' to get the latest
|
|
fixes that should make YCM work with such a configuration. Also rebuild Macvim
|
|
then. If you still get problems with this, see issue #18 [24] for suggestions.
|
|
|
|
-------------------------------------------------------------------------------
|
|
*youcompleteme-vim-segfaults-when-i-use-semantic-completer-in-ruby-files*
|
|
Vim segfaults when I use the semantic completer in Ruby files ~
|
|
|
|
This was caused by a Vim bug. Update your version of Vim (Vim 7.3.874 is known
|
|
to work, earlier versions may also fix this issue).
|
|
|
|
-------------------------------------------------------------------------------
|
|
*LONG_BIT-definition-appears-wrong-for-platform*
|
|
I get 'LONG_BIT definition appears wrong for platform' when compiling ~
|
|
|
|
Look at the output of your CMake call. There should be a line in it like the
|
|
following (with '.dylib' in place of '.so' on a Mac):
|
|
>
|
|
-- Found PythonLibs: /usr/lib/libpython2.7.so (Required is at least version "2.5")
|
|
<
|
|
That would be the **correct** output. An example of **incorrect** output would
|
|
be the following:
|
|
>
|
|
-- Found PythonLibs: /usr/lib/libpython2.7.so (found suitable version "2.5.1", minimum required is "2.5")
|
|
<
|
|
Notice how there's an extra bit of output there, the 'found suitable version
|
|
"<version>"' part, where '<version>' is not the same as the version of the
|
|
dynamic library. In the example shown, the library is version 2.7 but the
|
|
second string is version '2.5.1'.
|
|
|
|
This means that CMake found one version of Python headers and a different
|
|
version for the library. This is wrong. It can happen when you have multiple
|
|
versions of Python installed on your machine.
|
|
|
|
You should probably add the following flags to your cmake call (again, 'dylib'
|
|
instead of 'so' on a Mac):
|
|
>
|
|
-DPYTHON_INCLUDE_DIR=/usr/include/python2.7 -DPYTHON_LIBRARY=/usr/lib/libpython2.7.so
|
|
<
|
|
This will force the paths to the Python include directory and the Python
|
|
library to use. You may need to set these flags to something else, but you need
|
|
to make sure you use the same version of Python that your Vim binary is built
|
|
against, which is highly likely to be the system's default Python.
|
|
|
|
-------------------------------------------------------------------------------
|
|
*Vim:-Caught-deadly-signal-SEGV*
|
|
I get 'Vim: Caught deadly signal SEGV' on Vim startup ~
|
|
|
|
This can happen on some Linux distros. If you encounter this situation, run Vim
|
|
under 'gdb'. You'll probably see something like this in the output when Vim
|
|
crashes:
|
|
>
|
|
undefined symbol: clang_CompileCommands_dispose
|
|
<
|
|
This means that Vim is trying to load a 'libclang.so' that is too old. You need
|
|
at least a 3.2 libclang. Some distros ship with a system 'libclang.so' that
|
|
identifies itself as 3.2 but is not; it was cut from the upstream sources
|
|
before the official 3.2 release and some API changes (like the addition of the
|
|
CompileCommands API) were added after their cut.
|
|
|
|
So just go through the installation guide and make sure you are using a correct
|
|
'libclang.so'. I recommend downloading prebuilt binaries from llvm.org.
|
|
|
|
-------------------------------------------------------------------------------
|
|
*youcompleteme-ycm-does-not-read-identifiers-from-my-tags-files*
|
|
YCM does not read identifiers from my tags files ~
|
|
|
|
First, put 'let g:ycm_collect_identifiers_from_tags_files = 1' in your vimrc.
|
|
|
|
Make sure you are using Exuberant Ctags [25] to produce your tags files since
|
|
the only supported tag format is the Exuberant Ctags format [23]. The format
|
|
from "plain" ctags is NOT supported. The output of 'ctags --version' should
|
|
list "Exuberant Ctags".
|
|
|
|
Ctags needs to be called with the '--fields=+l' (that's a lowercase 'L', not a
|
|
one) option because YCM needs the 'language:<lang>' field in the tags output.
|
|
|
|
NOTE: Mac OS X comes with "plain" ctags installed by default. 'brew install
|
|
ctags' will get you the Exuberant Ctags version.
|
|
|
|
Also make sure that your Vim 'tags' option is set correctly. See ":h 'tags'"
|
|
for details. If you want to see which tag files YCM will read for a given
|
|
buffer, run ':echo tagfiles()' with the relevant buffer active. Note that that
|
|
function will only list tag files that already exist.
|
|
|
|
-------------------------------------------------------------------------------
|
|
*CTRL-sub-U*
|
|
'CTRL-U' in insert mode does not work ~
|
|
|
|
YCM keeps you in a 'completefunc' completion mode when you're typing in insert
|
|
mode and Vim disables '<C-U>' in completion mode as a "feature." Sadly there's
|
|
nothing I can do about this.
|
|
|
|
-------------------------------------------------------------------------------
|
|
*youcompleteme-why-isnt-ycm-just-written-in-plain-vimscript-ffs*
|
|
Why isn't YCM just written in plain VimScript, FFS? ~
|
|
|
|
Because of the identifier completion engine and subsequence-based filtering.
|
|
Let's say you have _many_ dozens of files open in a single Vim instance (I
|
|
often do); the identifier-based engine then needs to store thousands (if not
|
|
tens of thousands) of identifiers in its internal data-structures. When the
|
|
user types, YCM needs to perform subsequence-based filtering on _all_ of those
|
|
identifiers (every single one!) in less than 10 milliseconds.
|
|
|
|
I'm sorry, but that level of performance is just plain impossible to achieve
|
|
with VimScript. I've tried, and the language is just too slow. No, you can't
|
|
get acceptable performance even if you limit yourself to just the identifiers
|
|
in the current file and simple prefix-based fitering.
|
|
|
|
-------------------------------------------------------------------------------
|
|
*youcompleteme-why-does-ycm-demand-such-recent-version-of-vim*
|
|
Why does YCM demand such a recent version of Vim? ~
|
|
|
|
During YCM's development several show-stopper bugs where encountered in Vim.
|
|
Those needed to be fixed upstream (and were). A few months after those bugs
|
|
were fixed, Vim trunk landed the 'pyeval()' function which improved YCM
|
|
performance even more since less time was spent serializing and deserializing
|
|
data between Vim and the embedded Python interpreter. A few critical bugfixes
|
|
for 'pyeval()' landed in Vim 7.3.584 (and a few commits before that).
|
|
|
|
-------------------------------------------------------------------------------
|
|
*youcompleteme-i-get-annoying-messages-in-vims-status-area-when-i-type*
|
|
I get annoying messages in Vim's status area when I type ~
|
|
|
|
If you're referring to the 'User defined completion <bla bla> back at original'
|
|
and similar, then sadly there's no fix for those. Vim will emit them no matter
|
|
how hard I try to silence them.
|
|
|
|
You'll have to learn to ignore them. It's a shitty "solution", I know.
|
|
|
|
-------------------------------------------------------------------------------
|
|
*vim-sub-autoclose*
|
|
Nasty bugs happen if I have the 'vim-autoclose' plugin installed ~
|
|
|
|
Use the delimitMate [26] plugin instead. It does the same thing without
|
|
conflicting with YCM.
|
|
|
|
===============================================================================
|
|
*youcompleteme-contact*
|
|
Contact ~
|
|
|
|
If you have questions, bug reports, suggestions, etc. please use the issue
|
|
tracker [27]. The latest version is available at
|
|
http://valloric.github.io/YouCompleteMe/.
|
|
|
|
The author's homepage is http://val.markovic.io.
|
|
|
|
===============================================================================
|
|
*youcompleteme-license*
|
|
License ~
|
|
|
|
This software is licensed under the GPL v3 license [28]. © 2012 Strahinja Val
|
|
Markovic <val@markovic.io>.
|
|
|
|
===============================================================================
|
|
*youcompleteme-references*
|
|
References ~
|
|
|
|
[1] https://travis-ci.org/Valloric/YouCompleteMe
|
|
[2] https://travis-ci.org/Valloric/YouCompleteMe.png?branch=travis
|
|
[3] http://clang.llvm.org/
|
|
[4] https://github.com/davidhalter/jedi
|
|
[5] http://i.imgur.com/0OP4ood.gif
|
|
[6] http://en.wikipedia.org/wiki/Subsequence
|
|
[7] https://github.com/scrooloose/syntastic
|
|
[8] https://github.com/SirVer/ultisnips/blob/master/doc/UltiSnips.txt
|
|
[9] http://code.google.com/p/macvim/#Download
|
|
[10] https://github.com/gmarik/vundle#about
|
|
[11] http://mxcl.github.com/homebrew/
|
|
[12] http://www.cmake.org/cmake/resources/software.html
|
|
[13] https://github.com/Valloric/YouCompleteMe/wiki/Building-Vim-from-source
|
|
[14] https://github.com/Valloric/YouCompleteMe/wiki/Windows-Installation-Guide
|
|
[15] https://github.com/tpope/vim-pathogen#pathogenvim
|
|
[16] http://vimhelp.appspot.com/starting.txt.html#vimrc
|
|
[17] http://llvm.org/releases/download.html#3.2
|
|
[18] https://github.com/Valloric/YouCompleteMe/blob/master/cpp/ycm/.ycm_extra_conf.py
|
|
[19] http://clang.llvm.org/docs/JSONCompilationDatabase.html
|
|
[20] http://eclim.org/
|
|
[21] https://github.com/Valloric/YouCompleteMe/blob/master/python/ycm/completers/completer.py
|
|
[22] https://github.com/Valloric/ListToggle
|
|
[23] http://ctags.sourceforge.net/FORMAT
|
|
[24] https://github.com/Valloric/YouCompleteMe/issues/18
|
|
[25] http://ctags.sourceforge.net/
|
|
[26] https://github.com/Raimondi/delimitMate
|
|
[27] https://github.com/Valloric/YouCompleteMe/issues?state=open
|
|
[28] http://www.gnu.org/copyleft/gpl.html
|
|
|
|
vim: ft=help
|