251 lines
7.9 KiB
VimL
251 lines
7.9 KiB
VimL
" For older Vims without sign_place() the plugin has to manaage the sign ids.
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let s:first_sign_id = 3000
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let s:next_sign_id = s:first_sign_id
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" Remove-all-signs optimisation requires Vim 7.3.596+.
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let s:supports_star = v:version > 703 || (v:version == 703 && has("patch596"))
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function! gitgutter#sign#enable() abort
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let old_signs = g:gitgutter_signs
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let g:gitgutter_signs = 1
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call gitgutter#highlight#define_sign_text_highlights()
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if !old_signs && !g:gitgutter_highlight_lines && !g:gitgutter_highlight_linenrs
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call gitgutter#all(1)
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endif
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endfunction
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function! gitgutter#sign#disable() abort
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let g:gitgutter_signs = 0
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call gitgutter#highlight#define_sign_text_highlights()
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if !g:gitgutter_highlight_lines && !g:gitgutter_highlight_linenrs
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call gitgutter#sign#clear_signs(bufnr(''))
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endif
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endfunction
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function! gitgutter#sign#toggle() abort
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if g:gitgutter_signs
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call gitgutter#sign#disable()
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else
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call gitgutter#sign#enable()
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endif
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endfunction
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" Removes gitgutter's signs from the buffer being processed.
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function! gitgutter#sign#clear_signs(bufnr) abort
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if exists('*sign_unplace')
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call sign_unplace('gitgutter', {'buffer': a:bufnr})
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return
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endif
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call s:find_current_signs(a:bufnr)
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let sign_ids = map(values(gitgutter#utility#getbufvar(a:bufnr, 'gitgutter_signs')), 'v:val.id')
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call s:remove_signs(a:bufnr, sign_ids, 1)
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call gitgutter#utility#setbufvar(a:bufnr, 'gitgutter_signs', {})
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endfunction
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" Updates gitgutter's signs in the buffer being processed.
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"
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" modified_lines: list of [<line_number (number)>, <name (string)>]
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" where name = 'added|removed|modified|modified_removed'
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function! gitgutter#sign#update_signs(bufnr, modified_lines) abort
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if exists('*sign_unplace')
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" Vim is (hopefully) now quick enough to remove all signs then place new ones.
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call sign_unplace('gitgutter', {'buffer': a:bufnr})
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let modified_lines = s:handle_double_hunk(a:modified_lines)
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let signs = map(copy(modified_lines), '{'.
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\ '"buffer": a:bufnr,'.
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\ '"group": "gitgutter",'.
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\ '"name": s:highlight_name_for_change(v:val[1]),'.
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\ '"lnum": v:val[0],'.
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\ '"priority": g:gitgutter_sign_priority'.
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\ '}')
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if exists('*sign_placelist')
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call sign_placelist(signs)
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return
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endif
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for sign in signs
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call sign_place(0, sign.group, sign.name, sign.buffer, {'lnum': sign.lnum, 'priority': sign.priority})
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endfor
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return
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endif
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" Derive a delta between the current signs and the ones we want.
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" Remove signs from lines that no longer need a sign.
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" Upsert the remaining signs.
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call s:find_current_signs(a:bufnr)
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let new_gitgutter_signs_line_numbers = map(copy(a:modified_lines), 'v:val[0]')
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let obsolete_signs = s:obsolete_gitgutter_signs_to_remove(a:bufnr, new_gitgutter_signs_line_numbers)
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call s:remove_signs(a:bufnr, obsolete_signs, s:remove_all_old_signs)
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call s:upsert_new_gitgutter_signs(a:bufnr, a:modified_lines)
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endfunction
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"
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" Internal functions
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"
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function! s:find_current_signs(bufnr) abort
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let gitgutter_signs = {} " <line_number (string)>: {'id': <id (number)>, 'name': <name (string)>}
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if !g:gitgutter_sign_allow_clobber
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let other_signs = [] " [<line_number (number),...]
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endif
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if exists('*getbufinfo')
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let bufinfo = getbufinfo(a:bufnr)[0]
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let signs = has_key(bufinfo, 'signs') ? bufinfo.signs : []
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else
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let signs = []
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redir => signlines
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silent execute "sign place buffer=" . a:bufnr
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redir END
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for signline in filter(split(signlines, '\n')[2:], 'v:val =~# "="')
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" Typical sign line before v8.1.0614: line=88 id=1234 name=GitGutterLineAdded
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" We assume splitting is faster than a regexp.
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let components = split(signline)
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call add(signs, {
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\ 'lnum': str2nr(split(components[0], '=')[1]),
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\ 'id': str2nr(split(components[1], '=')[1]),
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\ 'name': split(components[2], '=')[1]
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\ })
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endfor
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endif
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for sign in signs
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if sign.name =~# 'GitGutter'
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" Remove orphaned signs (signs placed on lines which have been deleted).
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" (When a line is deleted its sign lingers. Subsequent lines' signs'
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" line numbers are decremented appropriately.)
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if has_key(gitgutter_signs, sign.lnum)
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execute "sign unplace" gitgutter_signs[sign.lnum].id
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endif
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let gitgutter_signs[sign.lnum] = {'id': sign.id, 'name': sign.name}
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else
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if !g:gitgutter_sign_allow_clobber
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call add(other_signs, sign.lnum)
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endif
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endif
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endfor
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call gitgutter#utility#setbufvar(a:bufnr, 'gitgutter_signs', gitgutter_signs)
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if !g:gitgutter_sign_allow_clobber
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call gitgutter#utility#setbufvar(a:bufnr, 'other_signs', other_signs)
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endif
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endfunction
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" Returns a list of [<id (number)>, ...]
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" Sets `s:remove_all_old_signs` as a side-effect.
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function! s:obsolete_gitgutter_signs_to_remove(bufnr, new_gitgutter_signs_line_numbers) abort
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let signs_to_remove = [] " list of [<id (number)>, ...]
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let remove_all_signs = 1
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let old_gitgutter_signs = gitgutter#utility#getbufvar(a:bufnr, 'gitgutter_signs')
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for line_number in keys(old_gitgutter_signs)
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if index(a:new_gitgutter_signs_line_numbers, str2nr(line_number)) == -1
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call add(signs_to_remove, old_gitgutter_signs[line_number].id)
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else
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let remove_all_signs = 0
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endif
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endfor
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let s:remove_all_old_signs = remove_all_signs
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return signs_to_remove
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endfunction
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function! s:remove_signs(bufnr, sign_ids, all_signs) abort
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if a:all_signs && s:supports_star && (g:gitgutter_sign_allow_clobber || empty(gitgutter#utility#getbufvar(a:bufnr, 'other_signs')))
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execute "sign unplace * buffer=" . a:bufnr
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else
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for id in a:sign_ids
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execute "sign unplace" id
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endfor
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endif
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endfunction
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function! s:upsert_new_gitgutter_signs(bufnr, modified_lines) abort
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if !g:gitgutter_sign_allow_clobber
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let other_signs = gitgutter#utility#getbufvar(a:bufnr, 'other_signs')
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endif
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let old_gitgutter_signs = gitgutter#utility#getbufvar(a:bufnr, 'gitgutter_signs')
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let modified_lines = s:handle_double_hunk(a:modified_lines)
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for line in modified_lines
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let line_number = line[0] " <number>
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if g:gitgutter_sign_allow_clobber || index(other_signs, line_number) == -1 " don't clobber others' signs
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let name = s:highlight_name_for_change(line[1])
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if !has_key(old_gitgutter_signs, line_number) " insert
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let id = s:next_sign_id()
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execute "sign place" id "line=" . line_number "name=" . name "buffer=" . a:bufnr
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else " update if sign has changed
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let old_sign = old_gitgutter_signs[line_number]
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if old_sign.name !=# name
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execute "sign place" old_sign.id "name=" . name "buffer=" . a:bufnr
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end
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endif
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endif
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endfor
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" At this point b:gitgutter_gitgutter_signs is out of date.
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endfunction
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" Handle special case where the first line is the site of two hunks:
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" lines deleted above at the start of the file, and lines deleted
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" immediately below.
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function! s:handle_double_hunk(modified_lines)
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if a:modified_lines[0:1] == [[1, 'removed_first_line'], [1, 'removed']]
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return [[1, 'removed_above_and_below']] + a:modified_lines[2:]
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endif
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return a:modified_lines
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endfunction
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function! s:next_sign_id() abort
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let next_id = s:next_sign_id
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let s:next_sign_id += 1
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return next_id
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endfunction
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" Only for testing.
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function! gitgutter#sign#reset()
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let s:next_sign_id = s:first_sign_id
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endfunction
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function! s:highlight_name_for_change(text) abort
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if a:text ==# 'added'
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return 'GitGutterLineAdded'
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elseif a:text ==# 'removed'
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return 'GitGutterLineRemoved'
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elseif a:text ==# 'removed_first_line'
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return 'GitGutterLineRemovedFirstLine'
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elseif a:text ==# 'modified'
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return 'GitGutterLineModified'
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elseif a:text ==# 'modified_removed'
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return 'GitGutterLineModifiedRemoved'
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elseif a:text ==# 'removed_above_and_below'
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return 'GitGutterLineRemovedAboveAndBelow'
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endif
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endfunction
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