vim-indent-guides/autoload/indent_guides.vim

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" Author: Nate Kane <nathanaelkane AT gmail DOT com>
" 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
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call indent_guides#highlight_colors()
call indent_guides#clear_matches()
" loop through each indent level and define a highlight pattern
" will automagically figure out whether to use tabs or spaces
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for l:level in range(1, g:indent_guides_indent_levels)
let l:group = 'IndentGuides' . ((l:level % 2 == 0) ? 'Even' : 'Odd')
let l:multiplier = (&l:expandtab == 1) ? &l:shiftwidth : 1
let l:pattern = '^\s\{' . (l:level * l:multiplier - l:multiplier) . '\}\zs'
let l:pattern .= '\s\{' . l:multiplier . '\}'
let l:pattern .= '\ze'
" define the higlight pattern and add to list
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call add(w:indent_guides_matches, matchadd(l:group, l: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)
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let l:index = 0
for l:match_id in w:indent_guides_matches
call matchdelete(l:match_id)
call remove(w:indent_guides_matches, l:index)
let l:index += l:index
endfor
endif
endfunction
"
" Automagically calculates and defines the indent highlight colors.
"
function! indent_guides#highlight_colors()
if g:indent_guides_auto_colors
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if has('gui_running')
call indent_guides#gui_highlight_colors()
else
call indent_guides#cterm_highlight_colors()
endif
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endif
endfunction
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"
" Defines the indent highlight colors for terminal vim.
"
" NOTE: This function contains no magic at the moment, it will simply use some
" light or dark preset colors depending on the `set background=` value.
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"
function! indent_guides#cterm_highlight_colors()
let l:colors = (&g:background == 'dark') ?
\ ['darkgrey', 'black'] : ['lightgrey', 'white']
exe 'hi IndentGuidesEven ctermbg=' . l:colors[0]
exe 'hi IndentGuidesOdd ctermbg=' . l:colors[1]
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endfunction
"
" Automagically calculates and defines the indent highlight colors for gui
" vim.
"
function! indent_guides#gui_highlight_colors()
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let l:hi_normal = indent_guides#capture_highlight('Normal')
let l:hex_pattern = 'guibg=\zs'. g:indent_guides_hex_color_pattern . '\ze'
let l:name_pattern = "guibg='\\?\\zs[0-9A-Za-z ]\\+\\ze'\\?"
let l:hi_normal_guibg = ''
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" capture the backgroud color from the normal highlight
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if l:hi_normal =~ l:hex_pattern
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" hex color code is being used, eg. '#FFFFFF'
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let l:hi_normal_guibg = matchstr(l:hi_normal, l:hex_pattern)
elseif l:hi_normal =~ l:name_pattern
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" color name is being used, eg. 'white'
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let l:color_name = matchstr(l:hi_normal, l:name_pattern)
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 =~ g:indent_guides_hex_color_pattern
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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)
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
exe 'hi IndentGuidesEven guibg=' . l:hi_even_bg
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end
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)
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let l:percent = g:indent_guides_color_change_percent
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let l:new_color = (&g:background == 'dark') ?
\ color_helper#hex_color_lighten(a:color, l:percent) :
\ color_helper#hex_color_darken (a:color, l:percent)
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return l: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)
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redir => l:output
exe "silent hi " . a:group_name
redir END
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return l: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
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"
" Define default highlights.
"
function! indent_guides#define_default_highlights()
exe 'hi IndentGuidesOdd guibg=NONE ctermbg=NONE'
exe 'hi IndentGuidesEven guibg=NONE ctermbg=NONE'
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endfunction