" Author: Nate Kane " Homepage: http://github.com/nathanaelkane/vim-indent-guides " " Toggles the indent guides on and off. " function! indent_guides#toggle() call indent_guides#init_matches() if empty(w:indent_guides_matches) call indent_guides#enable() else call indent_guides#disable() endif endfunction " " Called from autocmds, keeps indent guides enabled or disabled when entering " other buffers and windows. " function! indent_guides#process_autocmds() if g:indent_guides_autocmds_enabled call indent_guides#enable() else call indent_guides#disable() end endfunction " " Enables the indent guides for the current buffer and any other buffer upon " entering it. " function! indent_guides#enable() let g:indent_guides_autocmds_enabled = 1 call indent_guides#clear_matches() if g:indent_guides_auto_colors call indent_guides#highlight_colors() endif " loop through each indent level and define a highlight pattern " will automagically figure out whether to use tabs or spaces for level in range(1, g:indent_guides_indent_levels) let group = 'IndentGuides' . ((level % 2 == 0) ? 'Even' : 'Odd') let multiplier = (&l:expandtab == 1) ? &l:shiftwidth : 1 let pattern = '^\s\{' . (level * multiplier - multiplier) . '\}\zs' let pattern .= '\s\{' . multiplier . '\}' let pattern .= '\ze' " define the higlight pattern and add to list call add(w:indent_guides_matches, matchadd(group, pattern)) endfor endfunction " " Disables the indent guides for the current buffer and any other buffer upon " entering it. " function! indent_guides#disable() let g:indent_guides_autocmds_enabled = 0 call indent_guides#clear_matches() endfunction " " Clear all highlight matches for the current window. " function! indent_guides#clear_matches() call indent_guides#init_matches() if !empty(w:indent_guides_matches) let index = 0 for match_id in w:indent_guides_matches call matchdelete(match_id) call remove(w:indent_guides_matches, index) let index += index endfor endif endfunction " " Automagically calculates and defines the indent highlight colors. " " NOTE: Does not work when color names are used instead of hex colors. " Eg. 'guibg=#FFFFFF' works, but 'guibg=green' doesn't. " function! indent_guides#highlight_colors() if g:indent_guides_auto_colors " capture the backgroud color from the normal highlight let hi_normal = indent_guides#capture_highlight('normal') let pattern = 'guibg=\zs'. g:indent_guides_hex_color_pattern . '\ze' let hi_normal_guibg = matchstr(hi_normal, pattern) if hi_normal_guibg =~ g:indent_guides_hex_color_pattern " calculate the highlight background colors let hi_odd_bg = indent_guides#lighten_or_darken_color(hi_normal_guibg) let hi_even_bg = indent_guides#lighten_or_darken_color(hi_odd_bg) " define the new highlights exe "hi IndentGuidesOdd guibg=" . hi_odd_bg exe "hi IndentGuidesEven guibg=" . hi_even_bg end endif endfunction " " Takes a color and darkens or lightens it depending on whether a dark or light " colorscheme is being used. " function! indent_guides#lighten_or_darken_color(color) let percent = g:indent_guides_color_change_percent let new_color = (&g:background == 'dark') ? \ color_helper#hex_color_lighten(a:color, percent) : \ color_helper#hex_color_darken (a:color, percent) return new_color endfunction " " Captures and returns the output of highlight group definitions. " " Example: indent_guides#capture_highlight('normal') " Returns: 'Normal xxx guifg=#323232 guibg=#ffffff " function! indent_guides#capture_highlight(group_name) redir => output exe "silent hi " . a:group_name redir END return output endfunction " " Init the w:indent_guides_matches variable. " function! indent_guides#init_matches() let w:indent_guides_matches = \ exists('w:indent_guides_matches') ? w:indent_guides_matches : [] endfunction