320 lines
9.4 KiB
VimL
320 lines
9.4 KiB
VimL
" Folding support for LaTeX
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"
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" Options
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" g:LatexBox_Folding - Turn on/off folding
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" g:LatexBox_fold_preamble - Turn on/off folding of preamble
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" g:LatexBox_fold_parts - Define parts (eq. appendix, frontmatter) to fold
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" g:LatexBox_fold_sections - Define section levels to fold
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" g:LatexBox_fold_envs - Turn on/off folding of environments
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"
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" {{{1 Set options
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if exists('g:LatexBox_Folding') && g:LatexBox_Folding == 1
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setl foldmethod=expr
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setl foldexpr=LatexBox_FoldLevel(v:lnum)
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setl foldtext=LatexBox_FoldText()
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"
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" The foldexpr function returns "=" for most lines, which means it can become
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" slow for large files. The following is a hack that is based on this reply to
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" a discussion on the Vim Developer list:
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" http://permalink.gmane.org/gmane.editors.vim.devel/14100
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"
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augroup FastFold
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autocmd!
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autocmd InsertEnter *.tex setlocal foldmethod=manual
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autocmd InsertLeave *.tex setlocal foldmethod=expr
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augroup end
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endif
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if !exists('g:LatexBox_fold_preamble')
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let g:LatexBox_fold_preamble=1
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endif
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if !exists('g:LatexBox_fold_envs')
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let g:LatexBox_fold_envs=1
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endif
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if !exists('g:LatexBox_fold_parts')
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let g:LatexBox_fold_parts=[
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\ "appendix",
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\ "frontmatter",
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\ "mainmatter",
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\ "backmatter"
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\ ]
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endif
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if !exists('g:LatexBox_fold_sections')
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let g:LatexBox_fold_sections=[
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\ "part",
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\ "chapter",
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\ "section",
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\ "subsection",
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\ "subsubsection"
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\ ]
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endif
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if !exists('g:LatexBox_fold_toc')
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let g:LatexBox_fold_toc=0
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endif
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if !exists('g:LatexBox_fold_toc_levels')
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let g:LatexBox_fold_toc_levels=1
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endif
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" {{{1 LatexBox_FoldLevel help functions
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" This function parses the tex file to find the sections that are to be folded
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" and their levels, and then predefines the patterns for optimized folding.
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function! s:FoldSectionLevels()
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" Initialize
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let level = 1
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let foldsections = []
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" If we use two or more of the *matter commands, we need one more foldlevel
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let nparts = 0
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for part in g:LatexBox_fold_parts
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let i = 1
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while i < line("$")
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if getline(i) =~ '^\s*\\' . part . '\>'
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let nparts += 1
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break
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endif
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let i += 1
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endwhile
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if nparts > 1
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let level = 2
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break
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endif
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endfor
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" Combine sections and levels, but ignore unused section commands: If we
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" don't use the part command, then chapter should have the highest
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" level. If we don't use the chapter command, then section should be the
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" highest level. And so on.
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let ignore = 1
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for part in g:LatexBox_fold_sections
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" For each part, check if it is used in the file. We start adding the
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" part patterns to the fold sections array whenever we find one.
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let partpattern = '^\s*\(\\\|% Fake\)' . part . '\>'
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if ignore
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let i = 1
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while i < line("$")
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if getline(i) =~# partpattern
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call insert(foldsections, [partpattern, level])
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let level += 1
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let ignore = 0
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break
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endif
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let i += 1
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endwhile
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else
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call insert(foldsections, [partpattern, level])
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let level += 1
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endif
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endfor
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return foldsections
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endfunction
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" {{{1 LatexBox_FoldLevel
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" Parse file to dynamically set the sectioning fold levels
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let b:LatexBox_FoldSections = s:FoldSectionLevels()
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" Optimize by predefine common patterns
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let s:notbslash = '\%(\\\@<!\%(\\\\\)*\)\@<='
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let s:notcomment = '\%(\%(\\\@<!\%(\\\\\)*\)\@<=%.*\)\@<!'
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let s:envbeginpattern = s:notcomment . s:notbslash . '\\begin\s*{.\{-}}'
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let s:envendpattern = s:notcomment . s:notbslash . '\\end\s*{.\{-}}'
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let s:foldparts = '^\s*\\\%(' . join(g:LatexBox_fold_parts, '\|') . '\)'
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let s:folded = '\(% Fake\|\\\(document\|begin\|end\|'
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\ . 'front\|main\|back\|app\|sub\|section\|chapter\|part\)\)'
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function! LatexBox_FoldLevel(lnum)
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" Check for normal lines first (optimization)
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let line = getline(a:lnum)
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if line !~ s:folded
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return "="
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endif
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" Fold preamble
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if g:LatexBox_fold_preamble == 1
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if line =~# '\s*\\documentclass'
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return ">1"
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elseif line =~# '^\s*\\begin\s*{\s*document\s*}'
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return "0"
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endif
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endif
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" Fold parts (\frontmatter, \mainmatter, \backmatter, and \appendix)
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if line =~# s:foldparts
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return ">1"
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endif
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" Fold chapters and sections
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for [part, level] in b:LatexBox_FoldSections
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if line =~# part
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return ">" . level
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endif
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endfor
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" Never fold \end{document}
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if line =~# '^\s*\\end{document}'
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return 0
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endif
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" Fold environments
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if g:LatexBox_fold_envs == 1
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if line =~# s:envbeginpattern
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return "a1"
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elseif line =~# s:envendpattern
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return "s1"
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endif
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endif
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" Return foldlevel of previous line
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return "="
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endfunction
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" {{{1 LatexBox_FoldText help functions
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function! s:LabelEnv()
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let i = v:foldend
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while i >= v:foldstart
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if getline(i) =~ '^\s*\\label'
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return matchstr(getline(i), '^\s*\\label{\zs.*\ze}')
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end
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let i -= 1
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endwhile
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return ""
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endfunction
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function! s:CaptionEnv()
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let i = v:foldend
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while i >= v:foldstart
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if getline(i) =~ '^\s*\\caption'
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return matchstr(getline(i), '^\s*\\caption\(\[.*\]\)\?{\zs.\+')
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end
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let i -= 1
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endwhile
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return ""
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endfunction
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function! s:CaptionTable()
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let i = v:foldstart
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while i <= v:foldend
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if getline(i) =~ '^\s*\\caption'
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return matchstr(getline(i), '^\s*\\caption\(\[.*\]\)\?{\zs.\+')
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end
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let i += 1
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endwhile
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return ""
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endfunction
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function! s:CaptionFrame(line)
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" Test simple variants first
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let caption1 = matchstr(a:line,'\\begin\*\?{.*}{\zs.\+\ze}')
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let caption2 = matchstr(a:line,'\\begin\*\?{.*}{\zs.\+')
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if len(caption1) > 0
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return caption1
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elseif len(caption2) > 0
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return caption2
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else
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let i = v:foldstart
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while i <= v:foldend
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if getline(i) =~ '^\s*\\frametitle'
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return matchstr(getline(i),
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\ '^\s*\\frametitle\(\[.*\]\)\?{\zs.\+')
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end
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let i += 1
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endwhile
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return ""
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endif
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endfunction
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" {{{1 LatexBox_FoldText
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function! LatexBox_FoldText()
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" Initialize
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let line = getline(v:foldstart)
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let nlines = v:foldend - v:foldstart + 1
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let level = ''
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let title = 'Not defined'
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" Fold level
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let level = strpart(repeat('-', v:foldlevel-1) . '*',0,3)
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if v:foldlevel > 3
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let level = strpart(level, 1) . v:foldlevel
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endif
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let level = printf('%-3s', level)
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" Preamble
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if line =~ '\s*\\documentclass'
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let title = "Preamble"
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endif
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" Parts, sections and fakesections
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let sections = '\(\(sub\)*section\|part\|chapter\)'
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let secpat1 = '^\s*\\' . sections . '\*\?\s*{'
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let secpat2 = '^\s*\\' . sections . '\*\?\s*\['
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if line =~ '\\frontmatter'
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let title = "Frontmatter"
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elseif line =~ '\\mainmatter'
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let title = "Mainmatter"
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elseif line =~ '\\backmatter'
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let title = "Backmatter"
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elseif line =~ '\\appendix'
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let title = "Appendix"
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elseif line =~ secpat1 . '.*}'
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let title = matchstr(line, secpat1 . '\zs.*\ze}')
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elseif line =~ secpat1
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let title = matchstr(line, secpat1 . '\zs.*')
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elseif line =~ secpat2 . '.*\]'
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let title = matchstr(line, secpat2 . '\zs.*\ze\]')
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elseif line =~ secpat2
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let title = matchstr(line, secpat2 . '\zs.*')
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elseif line =~ 'Fake' . sections . ':'
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let title = matchstr(line,'Fake' . sections . ':\s*\zs.*')
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elseif line =~ 'Fake' . sections
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let title = matchstr(line, 'Fake' . sections)
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endif
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" Environments
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if line =~ '\\begin'
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" Capture environment name
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let env = matchstr(line,'\\begin\*\?{\zs\w*\*\?\ze}')
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" Set caption based on type of environment
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if env == 'frame'
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let label = ''
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let caption = s:CaptionFrame(line)
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elseif env == 'table'
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let label = s:LabelEnv()
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let caption = s:CaptionTable()
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else
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let label = s:LabelEnv()
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let caption = s:CaptionEnv()
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endif
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" If no caption found, check for a caption comment
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if caption == ''
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let caption = matchstr(line,'\\begin\*\?{.*}\s*%\s*\zs.*')
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endif
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" Create title based on caption and label
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if caption . label == ''
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let title = env
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elseif label == ''
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let title = printf('%-12s%s', env . ':',
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\ substitute(caption, '}\s*$', '',''))
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elseif caption == ''
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let title = printf('%-12s%56s', env, '(' . label . ')')
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else
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let title = printf('%-12s%-30s %21s', env . ':',
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\ strpart(substitute(caption, '}\s*$', '',''),0,34),
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\ '(' . label . ')')
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endif
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endif
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let title = strpart(title, 0, 68)
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return printf('%-3s %-68s #%5d', level, title, nlines)
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endfunction
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" {{{1 Footer
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" vim:fdm=marker:ff=unix:ts=4:sw=4
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