238 lines
7.2 KiB
VimL
238 lines
7.2 KiB
VimL
" Author: Nate Kane <nathanaelkane AT gmail DOT com>
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" Homepage: http://github.com/nathanaelkane/vim-indent-guides
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"
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" Toggles the indent guides on and off.
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"
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function! indent_guides#toggle()
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call indent_guides#init_matches()
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if empty(w:indent_guides_matches)
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call indent_guides#enable()
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else
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call indent_guides#disable()
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endif
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endfunction
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"
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" Called from autocmds, keeps indent guides enabled or disabled when entering
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" other buffers and windows.
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"
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function! indent_guides#process_autocmds()
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if g:indent_guides_autocmds_enabled
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call indent_guides#enable()
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else
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call indent_guides#disable()
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end
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endfunction
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"
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" Enables the indent guides for the current buffer and any other buffer upon
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" entering it.
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"
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function! indent_guides#enable()
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let g:indent_guides_autocmds_enabled = 1
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call indent_guides#init_script_vars()
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call indent_guides#highlight_colors()
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call indent_guides#clear_matches()
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" loop through each indent level and define a highlight pattern
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" will automagically figure out whether to use tabs or spaces
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for l:level in range(s:start_level, s:indent_levels)
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let l:group = 'IndentGuides' . ((l:level % 2 == 0) ? 'Even' : 'Odd')
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let l:pattern = '^\s\{' . (l:level * s:indent_size - s:indent_size) . '\}\zs'
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let l:pattern .= '\s\{' . s:guide_size . '\}'
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let l:pattern .= '\ze'
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" define the higlight pattern and add to list
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call add(w:indent_guides_matches, matchadd(l:group, l:pattern))
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endfor
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endfunction
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"
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" Disables the indent guides for the current buffer and any other buffer upon
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" entering it.
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"
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function! indent_guides#disable()
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let g:indent_guides_autocmds_enabled = 0
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call indent_guides#clear_matches()
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endfunction
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"
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" Clear all highlight matches for the current window.
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"
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function! indent_guides#clear_matches()
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call indent_guides#init_matches()
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if !empty(w:indent_guides_matches)
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let l:index = 0
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for l:match_id in w:indent_guides_matches
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call matchdelete(l:match_id)
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call remove(w:indent_guides_matches, l:index)
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let l:index += l:index
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endfor
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endif
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endfunction
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"
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" Automagically calculates and defines the indent highlight colors.
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"
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function! indent_guides#highlight_colors()
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if s:auto_colors
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if has('gui_running')
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call indent_guides#gui_highlight_colors()
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else
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call indent_guides#cterm_highlight_colors()
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endif
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endif
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endfunction
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"
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" Defines the indent highlight colors for terminal vim.
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"
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" NOTE: This function contains no magic at the moment, it will simply use some
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" light or dark preset colors depending on the `set background=` value.
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"
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function! indent_guides#cterm_highlight_colors()
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let l:colors = (&g:background == 'dark') ? ['darkgrey', 'black'] : ['lightgrey', 'white']
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exe 'hi IndentGuidesEven ctermbg=' . l:colors[0]
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exe 'hi IndentGuidesOdd ctermbg=' . l:colors[1]
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endfunction
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"
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" Automagically calculates and defines the indent highlight colors for gui
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" vim.
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"
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function! indent_guides#gui_highlight_colors()
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let l:hi_normal_guibg = ''
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" capture the backgroud color from the normal highlight
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if s:hi_normal =~ s:color_hex_bg_pat
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" hex color code is being used, eg. '#FFFFFF'
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let l:hi_normal_guibg = matchstr(s:hi_normal, s:color_hex_bg_pat)
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elseif s:hi_normal =~ s:color_name_bg_pat
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" color name is being used, eg. 'white'
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let l:color_name = matchstr(s:hi_normal, s:color_name_bg_pat)
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let l:hi_normal_guibg = color_helper#color_name_to_hex(l:color_name)
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endif
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if l:hi_normal_guibg =~ s:color_hex_pat
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" calculate the highlight background colors
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let l:hi_odd_bg = indent_guides#lighten_or_darken_color(l:hi_normal_guibg)
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let l:hi_even_bg = indent_guides#lighten_or_darken_color(l:hi_odd_bg)
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" define the new highlights
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exe 'hi IndentGuidesOdd guibg=' . l:hi_odd_bg
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exe 'hi IndentGuidesEven guibg=' . l:hi_even_bg
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end
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endfunction
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"
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" Takes a color and darkens or lightens it depending on whether a dark or light
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" colorscheme is being used.
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"
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function! indent_guides#lighten_or_darken_color(color)
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let l:new_color = ''
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if (&g:background == 'dark')
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let l:new_color = color_helper#hex_color_lighten(a:color, s:change_percent)
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else
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let l:new_color = color_helper#hex_color_darken (a:color, s:change_percent)
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endif
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return l:new_color
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endfunction
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"
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" Define default highlights.
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"
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function! indent_guides#define_default_highlights()
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exe 'hi IndentGuidesOdd guibg=NONE ctermbg=NONE'
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exe 'hi IndentGuidesEven guibg=NONE ctermbg=NONE'
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endfunction
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"
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" Init the w:indent_guides_matches variable.
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"
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function! indent_guides#init_matches()
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let w:indent_guides_matches = exists('w:indent_guides_matches') ? w:indent_guides_matches : []
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endfunction
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"
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" We need to initialize these vars every time a buffer is entered while the
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" plugin is enabled.
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"
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function! indent_guides#init_script_vars()
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let s:indent_size = indent_guides#get_indent_size()
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let s:guide_size = indent_guides#calculate_guide_size()
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let s:hi_normal = indent_guides#capture_highlight('Normal')
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" shortcuts to the global variables - this makes the code easier to read
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let s:debug = g:indent_guides_debug
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let s:indent_levels = g:indent_guides_indent_levels
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let s:auto_colors = g:indent_guides_auto_colors
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let s:change_percent = g:indent_guides_color_change_percent / 100.0
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let s:color_hex_pat = g:indent_guides_color_hex_pattern
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let s:color_hex_bg_pat = g:indent_guides_color_hex_guibg_pattern
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let s:color_name_bg_pat = g:indent_guides_color_name_guibg_pattern
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let s:start_level = g:indent_guides_start_level
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if s:debug
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echo 's:indent_size = ' . s:indent_size
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echo 's:guide_size = ' . s:guide_size
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echo 's:hi_normal = ' . s:hi_normal
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echo 's:indent_levels = ' . s:indent_levels
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echo 's:auto_colors = ' . s:auto_colors
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echo 's:change_percent = ' . string(s:change_percent)
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echo 's:color_hex_pat = ' . s:color_hex_pat
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echo 's:color_hex_bg_pat = ' . s:color_hex_bg_pat
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echo 's:color_name_bg_pat = ' . s:color_name_bg_pat
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echo 's:start_level = ' . s:start_level
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endif
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endfunction
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"
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" Calculate the indent guide size. Ensures the guide size is less than or
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" equal to the actual indent size, otherwise some weird things can occur.
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"
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" NOTE: Currently, this only works when soft-tabs are being used.
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"
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function! indent_guides#calculate_guide_size()
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let l:guide_size = g:indent_guides_guide_size
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let l:indent_size = indent_guides#get_indent_size()
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if l:indent_size > 1 && l:guide_size >= 1
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let l:guide_size = (l:guide_size > s:indent_size) ? s:indent_size : l:guide_size
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else
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let l:guide_size = s:indent_size
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endif
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return l:guide_size
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endfunction
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"
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" Gets the indent size, which depends on whether soft-tabs or hard-tabs are
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" being used.
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"
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function! indent_guides#get_indent_size()
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return (&l:expandtab == 1) ? &l:shiftwidth : 1
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endfunction
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"
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" Captures and returns the output of highlight group definitions.
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"
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" Example: indent_guides#capture_highlight('normal')
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" Returns: 'Normal xxx guifg=#323232 guibg=#ffffff
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"
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function! indent_guides#capture_highlight(group_name)
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redir => l:output
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exe "silent hi " . a:group_name
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redir END
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let l:output = substitute(l:output, "\n", "", "")
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return l:output
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endfunction
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