410 lines
13 KiB
VimL
410 lines
13 KiB
VimL
let s:nomodeline = (v:version > 703 || (v:version == 703 && has('patch442'))) ? '<nomodeline>' : ''
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let s:hunk_re = '^@@ -\(\d\+\),\?\(\d*\) +\(\d\+\),\?\(\d*\) @@'
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" True for git v1.7.2+.
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function! s:git_supports_command_line_config_override() abort
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call gitgutter#utility#system(g:gitgutter_git_executable.' '.g:gitgutter_git_args.' -c foo.bar=baz --version')
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return !v:shell_error
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endfunction
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let s:c_flag = s:git_supports_command_line_config_override()
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let s:temp_from = tempname()
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let s:temp_buffer = tempname()
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let s:counter = 0
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" Returns a diff of the buffer against the index or the working tree.
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"
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" After running the diff we pass it through grep where available to reduce
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" subsequent processing by the plugin. If grep is not available the plugin
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" does the filtering instead.
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"
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" When diffing against the index:
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"
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" The buffer contents is not the same as the file on disk so we need to pass
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" two instances of the file to git-diff:
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"
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" git diff myfileA myfileB
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"
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" where myfileA comes from
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"
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" git show :myfile > myfileA
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"
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" and myfileB is the buffer contents.
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"
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" Regarding line endings:
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"
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" git-show does not convert line endings.
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" git-diff FILE FILE does convert line endings for the given files.
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"
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" If a file has CRLF line endings and git's core.autocrlf is true,
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" the file in git's object store will have LF line endings. Writing
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" it out via git-show will produce a file with LF line endings.
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"
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" If this last file is one of the files passed to git-diff, git-diff will
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" convert its line endings to CRLF before diffing -- which is what we want --
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" but also by default output a warning on stderr.
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"
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" warning: LF will be replace by CRLF in <temp file>.
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" The file will have its original line endings in your working directory.
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"
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" When running the diff asynchronously, the warning message triggers the stderr
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" callbacks which assume the overall command has failed and reset all the
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" signs. As this is not what we want, and we can safely ignore the warning,
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" we turn it off by passing the '-c "core.safecrlf=false"' argument to
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" git-diff.
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"
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" When writing the temporary files we preserve the original file's extension
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" so that repos using .gitattributes to control EOL conversion continue to
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" convert correctly.
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"
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" Arguments:
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"
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" bufnr - the number of the buffer to be diffed
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" from - 'index' or 'working_tree'; what the buffer is diffed against
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" preserve_full_diff - truthy to return the full diff or falsey to return only
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" the hunk headers (@@ -x,y +m,n @@); only possible if
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" grep is available.
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function! gitgutter#diff#run_diff(bufnr, from, preserve_full_diff) abort
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if gitgutter#utility#repo_path(a:bufnr, 0) == -1
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throw 'gitgutter author fail'
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endif
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if gitgutter#utility#repo_path(a:bufnr, 0) == -2
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throw 'gitgutter not tracked'
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endif
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" Wrap compound commands in parentheses to make Windows happy.
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" bash doesn't mind the parentheses.
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let cmd = '('
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" Append buffer number to temp filenames to avoid race conditions between
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" writing and reading the files when asynchronously processing multiple
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" buffers.
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" Without the buffer number, buff_file would have a race between the
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" second gitgutter#process_buffer() writing the file (synchronously, below)
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" and the first gitgutter#process_buffer()'s async job reading it (with
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" git-diff).
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let buff_file = s:temp_buffer.'.'.a:bufnr
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" Add a counter to avoid a similar race with two quick writes of the same buffer.
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" Use a modulus greater than a maximum reasonable number of visible buffers.
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let s:counter = (s:counter + 1) % 20
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let buff_file .= '.'.s:counter
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let extension = gitgutter#utility#extension(a:bufnr)
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if !empty(extension)
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let buff_file .= '.'.extension
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endif
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" Write buffer to temporary file.
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" Note: this is synchronous.
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call s:write_buffer(a:bufnr, buff_file)
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if a:from ==# 'index'
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" Without the buffer number, from_file would have a race in the shell
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" between the second process writing it (with git-show) and the first
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" reading it (with git-diff).
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let from_file = s:temp_from.'.'.a:bufnr
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" Add a counter to avoid a similar race with two quick writes of the same buffer.
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let from_file .= '.'.s:counter
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if !empty(extension)
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let from_file .= '.'.extension
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endif
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" Write file from index to temporary file.
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let index_name = g:gitgutter_diff_base.':'.gitgutter#utility#repo_path(a:bufnr, 1)
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let cmd .= g:gitgutter_git_executable.' '.g:gitgutter_git_args.' --no-pager show '.index_name.' > '.from_file.' && '
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elseif a:from ==# 'working_tree'
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let from_file = gitgutter#utility#repo_path(a:bufnr, 1)
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endif
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" Call git-diff.
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let cmd .= g:gitgutter_git_executable.' '.g:gitgutter_git_args.' --no-pager '.g:gitgutter_git_args
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if s:c_flag
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let cmd .= ' -c "diff.autorefreshindex=0"'
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let cmd .= ' -c "diff.noprefix=false"'
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let cmd .= ' -c "core.safecrlf=false"'
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endif
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let cmd .= ' diff --no-ext-diff --no-color -U0 '.g:gitgutter_diff_args.' -- '.from_file.' '.buff_file
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" Pipe git-diff output into grep.
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if !a:preserve_full_diff && !empty(g:gitgutter_grep)
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let cmd .= ' | '.g:gitgutter_grep.' '.gitgutter#utility#shellescape('^@@ ')
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endif
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" grep exits with 1 when no matches are found; git-diff exits with 1 when
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" differences are found. However we want to treat non-matches and
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" differences as non-erroneous behaviour; so we OR the command with one
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" which always exits with success (0).
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let cmd .= ' || exit 0'
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let cmd .= ')'
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let cmd = gitgutter#utility#cd_cmd(a:bufnr, cmd)
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if g:gitgutter_async && gitgutter#async#available()
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call gitgutter#async#execute(cmd, a:bufnr, {
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\ 'out': function('gitgutter#diff#handler'),
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\ 'err': function('gitgutter#hunk#reset'),
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\ })
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return 'async'
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else
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let diff = gitgutter#utility#system(cmd)
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if v:shell_error
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call gitgutter#debug#log(diff)
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throw 'gitgutter diff failed'
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endif
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return diff
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endif
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endfunction
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function! gitgutter#diff#handler(bufnr, diff) abort
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call gitgutter#debug#log(a:diff)
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if !bufexists(a:bufnr)
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return
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endif
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call gitgutter#hunk#set_hunks(a:bufnr, gitgutter#diff#parse_diff(a:diff))
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let modified_lines = gitgutter#diff#process_hunks(a:bufnr, gitgutter#hunk#hunks(a:bufnr))
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let signs_count = len(modified_lines)
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if signs_count > g:gitgutter_max_signs
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call gitgutter#utility#warn_once(a:bufnr, printf(
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\ 'exceeded maximum number of signs (%d > %d, configured by g:gitgutter_max_signs).',
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\ signs_count, g:gitgutter_max_signs), 'max_signs')
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call gitgutter#sign#clear_signs(a:bufnr)
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else
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if g:gitgutter_signs || g:gitgutter_highlight_lines || g:gitgutter_highlight_linenrs
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call gitgutter#sign#update_signs(a:bufnr, modified_lines)
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endif
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endif
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call s:save_last_seen_change(a:bufnr)
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if exists('#User#GitGutter')
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let g:gitgutter_hook_context = {'bufnr': a:bufnr}
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execute 'doautocmd' s:nomodeline 'User GitGutter'
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unlet g:gitgutter_hook_context
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endif
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endfunction
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function! gitgutter#diff#parse_diff(diff) abort
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let hunks = []
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for line in split(a:diff, '\n')
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let hunk_info = gitgutter#diff#parse_hunk(line)
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if len(hunk_info) == 4
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call add(hunks, hunk_info)
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endif
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endfor
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return hunks
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endfunction
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function! gitgutter#diff#parse_hunk(line) abort
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let matches = matchlist(a:line, s:hunk_re)
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if len(matches) > 0
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let from_line = str2nr(matches[1])
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let from_count = (matches[2] == '') ? 1 : str2nr(matches[2])
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let to_line = str2nr(matches[3])
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let to_count = (matches[4] == '') ? 1 : str2nr(matches[4])
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return [from_line, from_count, to_line, to_count]
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else
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return []
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end
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endfunction
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" This function is public so it may be used by other plugins
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" e.g. vim-signature.
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function! gitgutter#diff#process_hunks(bufnr, hunks) abort
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let modified_lines = []
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for hunk in a:hunks
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call extend(modified_lines, s:process_hunk(a:bufnr, hunk))
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endfor
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return modified_lines
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endfunction
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" Returns [ [<line_number (number)>, <name (string)>], ...]
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function! s:process_hunk(bufnr, hunk) abort
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let modifications = []
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let from_line = a:hunk[0]
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let from_count = a:hunk[1]
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let to_line = a:hunk[2]
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let to_count = a:hunk[3]
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if s:is_added(from_count, to_count)
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call s:process_added(modifications, from_count, to_count, to_line)
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call gitgutter#hunk#increment_lines_added(a:bufnr, to_count)
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elseif s:is_removed(from_count, to_count)
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call s:process_removed(modifications, from_count, to_count, to_line)
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call gitgutter#hunk#increment_lines_removed(a:bufnr, from_count)
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elseif s:is_modified(from_count, to_count)
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call s:process_modified(modifications, from_count, to_count, to_line)
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call gitgutter#hunk#increment_lines_modified(a:bufnr, to_count)
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elseif s:is_modified_and_added(from_count, to_count)
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call s:process_modified_and_added(modifications, from_count, to_count, to_line)
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call gitgutter#hunk#increment_lines_added(a:bufnr, to_count - from_count)
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call gitgutter#hunk#increment_lines_modified(a:bufnr, from_count)
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elseif s:is_modified_and_removed(from_count, to_count)
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call s:process_modified_and_removed(modifications, from_count, to_count, to_line)
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call gitgutter#hunk#increment_lines_modified(a:bufnr, to_count)
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call gitgutter#hunk#increment_lines_removed(a:bufnr, from_count - to_count)
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endif
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return modifications
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endfunction
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function! s:is_added(from_count, to_count) abort
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return a:from_count == 0 && a:to_count > 0
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endfunction
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function! s:is_removed(from_count, to_count) abort
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return a:from_count > 0 && a:to_count == 0
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endfunction
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function! s:is_modified(from_count, to_count) abort
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return a:from_count > 0 && a:to_count > 0 && a:from_count == a:to_count
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endfunction
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function! s:is_modified_and_added(from_count, to_count) abort
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return a:from_count > 0 && a:to_count > 0 && a:from_count < a:to_count
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endfunction
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function! s:is_modified_and_removed(from_count, to_count) abort
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return a:from_count > 0 && a:to_count > 0 && a:from_count > a:to_count
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endfunction
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function! s:process_added(modifications, from_count, to_count, to_line) abort
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let offset = 0
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while offset < a:to_count
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let line_number = a:to_line + offset
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call add(a:modifications, [line_number, 'added'])
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let offset += 1
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endwhile
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endfunction
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function! s:process_removed(modifications, from_count, to_count, to_line) abort
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if a:to_line == 0
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call add(a:modifications, [1, 'removed_first_line'])
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else
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call add(a:modifications, [a:to_line, 'removed'])
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endif
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endfunction
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function! s:process_modified(modifications, from_count, to_count, to_line) abort
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let offset = 0
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while offset < a:to_count
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let line_number = a:to_line + offset
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call add(a:modifications, [line_number, 'modified'])
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let offset += 1
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endwhile
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endfunction
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function! s:process_modified_and_added(modifications, from_count, to_count, to_line) abort
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let offset = 0
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while offset < a:from_count
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let line_number = a:to_line + offset
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call add(a:modifications, [line_number, 'modified'])
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let offset += 1
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endwhile
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while offset < a:to_count
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let line_number = a:to_line + offset
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call add(a:modifications, [line_number, 'added'])
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let offset += 1
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endwhile
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endfunction
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function! s:process_modified_and_removed(modifications, from_count, to_count, to_line) abort
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let offset = 0
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while offset < a:to_count
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let line_number = a:to_line + offset
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call add(a:modifications, [line_number, 'modified'])
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let offset += 1
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endwhile
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let a:modifications[-1] = [a:to_line + offset - 1, 'modified_removed']
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endfunction
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" Returns a diff for the current hunk.
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" Assumes there is only 1 current hunk unless the optional argument is given,
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" in which case the cursor is in two hunks and the argument specifies the one
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" to choose.
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"
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" Optional argument: 0 (to use the first hunk) or 1 (to use the second).
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function! gitgutter#diff#hunk_diff(bufnr, full_diff, ...)
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let modified_diff = []
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let hunk_index = 0
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let keep_line = 1
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" Don't keepempty when splitting because the diff we want may not be the
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" final one. Instead add trailing NL at end of function.
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for line in split(a:full_diff, '\n')
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let hunk_info = gitgutter#diff#parse_hunk(line)
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if len(hunk_info) == 4 " start of new hunk
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let keep_line = gitgutter#hunk#cursor_in_hunk(hunk_info)
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if a:0 && hunk_index != a:1
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let keep_line = 0
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endif
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let hunk_index += 1
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endif
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if keep_line
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call add(modified_diff, line)
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endif
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endfor
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return join(modified_diff, "\n")."\n"
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endfunction
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function! s:write_buffer(bufnr, file)
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let bufcontents = getbufline(a:bufnr, 1, '$')
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if bufcontents == [''] && line2byte(1) == -1
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" Special case: completely empty buffer.
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" A nearly empty buffer of only a newline has line2byte(1) == 1.
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call writefile([], a:file)
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return
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endif
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if getbufvar(a:bufnr, '&fileformat') ==# 'dos'
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call map(bufcontents, 'v:val."\r"')
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endif
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if getbufvar(a:bufnr, '&endofline')
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call add(bufcontents, '')
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endif
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let fenc = getbufvar(a:bufnr, '&fileencoding')
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if fenc !=# &encoding
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call map(bufcontents, 'iconv(v:val, &encoding, "'.fenc.'")')
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endif
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if getbufvar(a:bufnr, '&bomb')
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let bufcontents[0]=''.bufcontents[0]
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endif
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call writefile(bufcontents, a:file, 'b')
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endfunction
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function! s:save_last_seen_change(bufnr) abort
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call gitgutter#utility#setbufvar(a:bufnr, 'tick', getbufvar(a:bufnr, 'changedtick'))
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endfunction
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