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|
" Vim doesn't namespace sign ids so every plugin shares the same
" namespace. Sign ids are simply integers so to avoid clashes with other
" signs we guess at a clear run.
"
" Note also we currently never reset s:next_sign_id.
let s:first_sign_id = 3000
let s:next_sign_id = s:first_sign_id
let s:dummy_sign_id = s:first_sign_id - 1
" Remove-all-signs optimisation requires Vim 7.3.596+.
let s:supports_star = v:version > 703 || (v:version == 703 && has("patch596"))
" Removes gitgutter's signs (excluding dummy sign) from the buffer being processed.
function! gitgutter#sign#clear_signs() abort
let bufnr = gitgutter#utility#bufnr()
call gitgutter#sign#find_current_signs()
let sign_ids = map(values(getbufvar(bufnr, 'gitgutter_gitgutter_signs')), 'v:val.id')
call gitgutter#sign#remove_signs(sign_ids, 1)
call setbufvar(bufnr, 'gitgutter_gitgutter_signs', {})
endfunction
" Updates gitgutter's signs in the buffer being processed.
"
" modified_lines: list of [<line_number (number)>, <name (string)>]
" where name = 'added|removed|modified|modified_removed'
function! gitgutter#sign#update_signs(modified_lines) abort
call gitgutter#sign#find_current_signs()
let new_gitgutter_signs_line_numbers = map(copy(a:modified_lines), 'v:val[0]')
let obsolete_signs = gitgutter#sign#obsolete_gitgutter_signs_to_remove(new_gitgutter_signs_line_numbers)
let flicker_possible = s:remove_all_old_signs && !empty(a:modified_lines)
if flicker_possible
call gitgutter#sign#add_dummy_sign()
endif
call gitgutter#sign#remove_signs(obsolete_signs, s:remove_all_old_signs)
call gitgutter#sign#upsert_new_gitgutter_signs(a:modified_lines)
if flicker_possible
call gitgutter#sign#remove_dummy_sign(0)
endif
endfunction
function! gitgutter#sign#add_dummy_sign() abort
let bufnr = gitgutter#utility#bufnr()
if !getbufvar(bufnr, 'gitgutter_dummy_sign')
execute "sign place" s:dummy_sign_id "line=" . 9999 "name=GitGutterDummy buffer=" . bufnr
call setbufvar(bufnr, 'gitgutter_dummy_sign', 1)
endif
endfunction
function! gitgutter#sign#remove_dummy_sign(force) abort
let bufnr = gitgutter#utility#bufnr()
if getbufvar(bufnr, 'gitgutter_dummy_sign') && (a:force || !g:gitgutter_sign_column_always)
execute "sign unplace" s:dummy_sign_id "buffer=" . bufnr
call setbufvar(bufnr, 'gitgutter_dummy_sign', 0)
endif
endfunction
"
" Internal functions
"
function! gitgutter#sign#find_current_signs() abort
let bufnr = gitgutter#utility#bufnr()
let gitgutter_signs = {} " <line_number (string)>: {'id': <id (number)>, 'name': <name (string)>}
let other_signs = [] " [<line_number (number),...]
let dummy_sign_placed = 0
redir => signs
silent execute "sign place buffer=" . bufnr
redir END
for sign_line in filter(split(signs, '\n')[2:], 'v:val =~# "="')
" Typical sign line: line=88 id=1234 name=GitGutterLineAdded
" We assume splitting is faster than a regexp.
let components = split(sign_line)
let name = split(components[2], '=')[1]
if name =~# 'GitGutterDummy'
let dummy_sign_placed = 1
else
let line_number = str2nr(split(components[0], '=')[1])
if name =~# 'GitGutter'
let id = str2nr(split(components[1], '=')[1])
" Remove orphaned signs (signs placed on lines which have been deleted).
" (When a line is deleted its sign lingers. Subsequent lines' signs'
" line numbers are decremented appropriately.)
if has_key(gitgutter_signs, line_number)
execute "sign unplace" gitgutter_signs[line_number].id
endif
let gitgutter_signs[line_number] = {'id': id, 'name': name}
else
call add(other_signs, line_number)
endif
end
endfor
call setbufvar(bufnr, 'gitgutter_dummy_sign', dummy_sign_placed)
call setbufvar(bufnr, 'gitgutter_gitgutter_signs', gitgutter_signs)
call setbufvar(bufnr, 'gitgutter_other_signs', other_signs)
endfunction
" Returns a list of [<id (number)>, ...]
" Sets `s:remove_all_old_signs` as a side-effect.
function! gitgutter#sign#obsolete_gitgutter_signs_to_remove(new_gitgutter_signs_line_numbers) abort
let bufnr = gitgutter#utility#bufnr()
let signs_to_remove = [] " list of [<id (number)>, ...]
let remove_all_signs = 1
let old_gitgutter_signs = getbufvar(bufnr, 'gitgutter_gitgutter_signs')
for line_number in keys(old_gitgutter_signs)
if index(a:new_gitgutter_signs_line_numbers, str2nr(line_number)) == -1
call add(signs_to_remove, old_gitgutter_signs[line_number].id)
else
let remove_all_signs = 0
endif
endfor
let s:remove_all_old_signs = remove_all_signs
return signs_to_remove
endfunction
function! gitgutter#sign#remove_signs(sign_ids, all_signs) abort
let bufnr = gitgutter#utility#bufnr()
if a:all_signs && s:supports_star && empty(getbufvar(bufnr, 'gitgutter_other_signs'))
let dummy_sign_present = getbufvar(bufnr, 'gitgutter_dummy_sign')
execute "sign unplace * buffer=" . bufnr
if dummy_sign_present
execute "sign place" s:dummy_sign_id "line=" . 9999 "name=GitGutterDummy buffer=" . bufnr
endif
else
for id in a:sign_ids
execute "sign unplace" id
endfor
endif
endfunction
function! gitgutter#sign#upsert_new_gitgutter_signs(modified_lines) abort
let bufnr = gitgutter#utility#bufnr()
let other_signs = getbufvar(bufnr, 'gitgutter_other_signs')
let old_gitgutter_signs = getbufvar(bufnr, 'gitgutter_gitgutter_signs')
for line in a:modified_lines
let line_number = line[0] " <number>
if index(other_signs, line_number) == -1 " don't clobber others' signs
let name = gitgutter#utility#highlight_name_for_change(line[1])
if !has_key(old_gitgutter_signs, line_number) " insert
let id = gitgutter#sign#next_sign_id()
execute "sign place" id "line=" . line_number "name=" . name "buffer=" . bufnr
else " update if sign has changed
let old_sign = old_gitgutter_signs[line_number]
if old_sign.name !=# name
execute "sign place" old_sign.id "name=" . name "buffer=" . bufnr
end
endif
endif
endfor
" At this point b:gitgutter_gitgutter_signs is out of date.
endfunction
function! gitgutter#sign#next_sign_id() abort
let next_id = s:next_sign_id
let s:next_sign_id += 1
return next_id
endfunction
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