243 lines
7 KiB
VimL
243 lines
7 KiB
VimL
" Copyright 2011 The Go Authors. All rights reserved.
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" Use of this source code is governed by a BSD-style
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" license that can be found in the LICENSE file.
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"
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" fmt.vim: Vim command to format Go files with gofmt (and gofmt compatible
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" toorls, such as goimports).
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if !exists("g:go_fmt_command")
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let g:go_fmt_command = "gofmt"
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endif
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if !exists("g:go_goimports_bin")
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let g:go_goimports_bin = "goimports"
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endif
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if !exists('g:go_fmt_fail_silently')
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let g:go_fmt_fail_silently = 0
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endif
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if !exists('g:go_fmt_options')
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let g:go_fmt_options = ''
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endif
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if !exists("g:go_fmt_experimental")
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let g:go_fmt_experimental = 0
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endif
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" we have those problems :
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" http://stackoverflow.com/questions/12741977/prevent-vim-from-updating-its-undo-tree
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" http://stackoverflow.com/questions/18532692/golang-formatter-and-vim-how-to-destroy-history-record?rq=1
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"
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" The below function is an improved version that aims to fix all problems.
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" it doesn't undo changes and break undo history. If you are here reading
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" this and have VimL experience, please look at the function for
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" improvements, patches are welcome :)
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function! go#fmt#Format(withGoimport) abort
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if g:go_fmt_experimental == 1
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" Using winsaveview to save/restore cursor state has the problem of
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" closing folds on save:
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" https://github.com/fatih/vim-go/issues/502
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" One fix is to use mkview instead. Unfortunately, this sometimes causes
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" other bad side effects:
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" https://github.com/fatih/vim-go/issues/728
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" and still closes all folds if foldlevel>0:
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" https://github.com/fatih/vim-go/issues/732
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let l:curw = {}
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try
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mkview!
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catch
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let l:curw = winsaveview()
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endtry
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" save our undo file to be restored after we are done. This is needed to
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" prevent an additional undo jump due to BufWritePre auto command and also
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" restore 'redo' history because it's getting being destroyed every
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" BufWritePre
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let tmpundofile = tempname()
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exe 'wundo! ' . tmpundofile
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else
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" Save cursor position and many other things.
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let l:curw = winsaveview()
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endif
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" Write current unsaved buffer to a temp file
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let l:tmpname = tempname()
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call writefile(go#util#GetLines(), l:tmpname)
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if go#util#IsWin()
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let l:tmpname = tr(l:tmpname, '\', '/')
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endif
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let bin_name = g:go_fmt_command
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if a:withGoimport == 1
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let bin_name = g:go_goimports_bin
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endif
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let out = go#fmt#run(bin_name, l:tmpname, expand('%'))
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if go#util#ShellError() == 0
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call go#fmt#update_file(l:tmpname, expand('%'))
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elseif g:go_fmt_fail_silently == 0
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let errors = s:parse_errors(out)
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call s:show_errors(errors)
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endif
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" We didn't use the temp file, so clean up
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call delete(l:tmpname)
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if g:go_fmt_experimental == 1
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" restore our undo history
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silent! exe 'rundo ' . tmpundofile
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call delete(tmpundofile)
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" Restore our cursor/windows positions, folds, etc.
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if empty(l:curw)
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silent! loadview
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else
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call winrestview(l:curw)
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endif
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else
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" Restore our cursor/windows positions.
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call winrestview(l:curw)
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endif
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endfunction
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" update_file updates the target file with the given formatted source
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function! go#fmt#update_file(source, target)
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" remove undo point caused via BufWritePre
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try | silent undojoin | catch | endtry
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let old_fileformat = &fileformat
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if exists("*getfperm")
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" save file permissions
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let original_fperm = getfperm(a:target)
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endif
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call rename(a:source, a:target)
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" restore file permissions
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if exists("*setfperm") && original_fperm != ''
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call setfperm(a:target , original_fperm)
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endif
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" reload buffer to reflect latest changes
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silent! edit!
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let &fileformat = old_fileformat
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let &syntax = &syntax
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" clean up previous location list
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let l:listtype = "locationlist"
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call go#list#Clean(l:listtype)
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call go#list#Window(l:listtype)
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endfunction
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" run runs the gofmt/goimport command for the given source file and returns
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" the the output of the executed command. Target is the real file to be
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" formated.
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function! go#fmt#run(bin_name, source, target)
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let cmd = s:fmt_cmd(a:bin_name, a:source, a:target)
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if cmd[0] == "goimports"
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" change GOPATH too, so goimports can pick up the correct library
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let old_gopath = $GOPATH
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let $GOPATH = go#path#Detect()
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endif
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let command = join(cmd, " ")
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" execute our command...
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let out = go#util#System(command)
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if cmd[0] == "goimports"
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let $GOPATH = old_gopath
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endif
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return out
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endfunction
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" fmt_cmd returns a dict that contains the command to execute gofmt (or
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" goimports). args is dict with
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function! s:fmt_cmd(bin_name, source, target)
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" check if the user has installed command binary.
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" For example if it's goimports, let us check if it's installed,
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" if not the user get's a warning via go#path#CheckBinPath()
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let bin_path = go#path#CheckBinPath(a:bin_name)
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if empty(bin_path)
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return
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endif
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" start constructing the command
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let cmd = [bin_path]
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call add(cmd, "-w")
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if a:bin_name != "goimports"
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call extend(cmd, split(g:go_fmt_options, " "))
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else
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" lazy check if goimports support `-srcdir`. We should eventually remove
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" this in the future
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if !exists('b:goimports_vendor_compatible')
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let out = go#util#System(bin_path . " --help")
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if out !~ "-srcdir"
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call go#util#EchoWarning(printf("vim-go: goimports (%s) does not support srcdir. Update with: :GoUpdateBinaries", bin_path))
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else
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let b:goimports_vendor_compatible = 1
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endif
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endif
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if exists('b:goimports_vendor_compatible') && b:goimports_vendor_compatible
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let ssl_save = &shellslash
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set noshellslash
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call extend(cmd, ["-srcdir", shellescape(fnamemodify(a:target, ":p"))])
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let &shellslash = ssl_save
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endif
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endif
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call add(cmd, a:source)
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return cmd
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endfunction
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" parse_errors parses the given errors and returns a list of parsed errors
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function! s:parse_errors(content) abort
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let splitted = split(a:content, '\n')
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" list of errors to be put into location list
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let errors = []
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for line in splitted
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let tokens = matchlist(line, '^\(.\{-}\):\(\d\+\):\(\d\+\)\s*\(.*\)')
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if !empty(tokens)
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call add(errors,{
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\"lnum": tokens[2],
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\"col": tokens[3],
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\"text": tokens[4],
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\ })
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endif
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endfor
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return errors
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endfunction
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" show_errors opens a location list and shows the given errors. If the given
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" errors is empty, it closes the the location list
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function! s:show_errors(errors) abort
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let l:listtype = "locationlist"
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if !empty(a:errors)
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call go#list#Populate(l:listtype, a:errors, 'Format')
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echohl Error | echomsg "Gofmt returned error" | echohl None
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endif
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" this closes the window if there are no errors or it opens
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" it if there is any
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call go#list#Window(l:listtype, len(a:errors))
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endfunction
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function! go#fmt#ToggleFmtAutoSave() abort
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if get(g:, "go_fmt_autosave", 1)
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let g:go_fmt_autosave = 0
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call go#util#EchoProgress("auto fmt disabled")
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return
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end
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let g:go_fmt_autosave = 1
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call go#util#EchoProgress("auto fmt enabled")
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endfunction
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" vim: sw=2 ts=2 et
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