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Fall back to sensible sign colours

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Do this when there are no existing GitGutter* highlight groups and the
Diff* highlight groups have the same foreground colours.
This commit is contained in:
Andy Stewart
2020-04-28 17:15:53 +01:00
parent 67d5dc11d6
commit f458f43cf2
1 changed files with 23 additions and 13 deletions
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36
autoload/gitgutter/highlight.vim
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@@ -85,25 +85,18 @@ function! gitgutter#highlight#define_highlights() abort
" When they are visible.
" If GitGutter* highlights are already defined, either by the user or the colourscheme,
" set their backgrounds to the sign column's.
" The background colours are set to the sign column's.
for type in ["Add", "Change", "Delete"]
if hlexists("GitGutter".type)
" Were the highlight self-contained we could just declare the
" background attributes and they would be merged. But it might be a
" link, in which case it would be overwritten. So re-declare it in its
" entirety.
let [guifg, ctermfg] = s:get_foreground_colors('GitGutter'.type)
execute "highlight GitGutter".type." guifg=".guifg." guibg=".guibg." ctermfg=".ctermfg." ctermbg=".ctermbg
elseif s:useful_diff_colours()
let [guifg, ctermfg] = s:get_foreground_colors('Diff'.type)
else
let [guifg, ctermfg] = s:get_foreground_fallback_colors(type)
endif
execute "highlight GitGutter".type." guifg=".guifg." guibg=".guibg." ctermfg=".ctermfg." ctermbg=".ctermbg
endfor
" By default use Diff* foreground colors with SignColumn's background.
for type in ['Add', 'Change', 'Delete']
let [guifg, ctermfg] = s:get_foreground_colors('Diff'.type)
execute "highlight GitGutter".type."Default guifg=".guifg." guibg=".guibg." ctermfg=".ctermfg." ctermbg=".ctermbg
execute "highlight default link GitGutter".type." GitGutter".type."Default"
endfor
highlight default link GitGutterChangeDelete GitGutterChange
" Highlights used for the whole line.
@@ -236,3 +229,20 @@ function! s:get_background_colors(group) abort
let guibg = s:get_hl(a:group, 'bg', 'gui')
return [guibg, ctermbg]
endfunction
function! s:useful_diff_colours()
let [guifg_add, ctermfg_add] = s:get_foreground_colors('DiffAdd')
let [guifg_del, ctermfg_del] = s:get_foreground_colors('DiffDelete')
return guifg_add != guifg_del && ctermfg_add != ctermfg_del
endfunction
function! s:get_foreground_fallback_colors(type)
if a:type == 'Add'
return ['#009900', '2']
elseif a:type == 'Change'
return ['#bbbb00', '3']
elseif a:type == 'Delete'
return ['#ff2222', '1']
endif
endfunction