Add zig support, closes #405

autoload/zig/fmt.vim

@@ -0,0 +1,170 @@
+if exists('g:polyglot_disabled') && index(g:polyglot_disabled, 'zig') != -1
+  finish
+endif
+
+" Adapted from fatih/vim-go: autoload/go/fmt.vim
+"
+" Copyright 2011 The Go Authors. All rights reserved.
+" Use of this source code is governed by a BSD-style
+" license that can be found in the LICENSE file.
+"
+function! zig#fmt#Format() abort
+  if zig#config#FmtExperimental()
+    " Using winsaveview to save/restore cursor state has the problem of
+    " closing folds on save:
+    "   https://github.com/fatih/vim-go/issues/502
+    " One fix is to use mkview instead. Unfortunately, this sometimes causes
+    " other bad side effects:
+    "   https://github.com/fatih/vim-go/issues/728
+    " and still closes all folds if foldlevel>0:
+    "   https://github.com/fatih/vim-go/issues/732
+    let l:curw = {}
+    try
+      mkview!
+    catch
+      let l:curw = winsaveview()
+    endtry
+
+    " save our undo file to be restored after we are done. This is needed to
+    " prevent an additional undo jump due to BufWritePre auto command and also
+    " restore 'redo' history because it's getting being destroyed every
+    " BufWritePre
+    let tmpundofile = tempname()
+    exe 'wundo! ' . tmpundofile
+  else
+    " Save cursor position and many other things.
+    let l:curw = winsaveview()
+  endif
+
+  " Save cursor position and many other things.
+  let l:curw = winsaveview()
+
+  let bin_name = zig#config#FmtCommand()
+
+  " Get current position in file
+  let current_col = col('.')
+  let orig_line_count = line('$')
+
+  " Save current buffer first, else fmt will run on the original file and we
+  " will lose our changes.
+  silent! execute 'write' expand('%')
+
+  let [l:out, l:err] = zig#fmt#run(bin_name, expand('%'))
+
+  if l:err == 0
+    call zig#fmt#update_file(expand('%'))
+  elseif !zig#config#FmtFailSilently()
+    let errors = s:parse_errors(expand('%'), out)
+    call s:show_errors(errors)
+  endif
+
+  let diff_offset = line('$') - orig_line_count
+
+  if zig#config#FmtExperimental()
+    " restore our undo history
+    silent! exe 'rundo ' . tmpundofile
+    call delete(tmpundofile)
+
+    " Restore our cursor/windows positions, folds, etc.
+    if empty(l:curw)
+      silent! loadview
+    else
+      call winrestview(l:curw)
+    endif
+  else
+    " Restore our cursor/windows positions.
+    call winrestview(l:curw)
+  endif
+
+  " be smart and jump to the line the new statement was added/removed
+  call cursor(line('.') + diff_offset, current_col)
+
+  " Syntax highlighting breaks less often.
+  syntax sync fromstart
+endfunction
+
+" update_file updates the target file with the given formatted source
+function! zig#fmt#update_file(target)
+  " remove undo point caused via BufWritePre
+  try | silent undojoin | catch | endtry
+
+  " reload buffer to reflect latest changes
+  silent edit!
+
+  let l:listtype = zig#list#Type("ZigFmt")
+
+  " the title information was introduced with 7.4-2200
+  " https://github.com/vim/vim/commit/d823fa910cca43fec3c31c030ee908a14c272640
+  if has('patch-7.4.2200')
+    " clean up previous list
+    if l:listtype == "quickfix"
+      let l:list_title = getqflist({'title': 1})
+    else
+      let l:list_title = getloclist(0, {'title': 1})
+    endif
+  else
+    " can't check the title, so assume that the list was for go fmt.
+    let l:list_title = {'title': 'Format'}
+  endif
+
+  if has_key(l:list_title, "title") && l:list_title['title'] == "Format"
+    call zig#list#Clean(l:listtype)
+  endif
+endfunction
+
+" run runs the gofmt/goimport command for the given source file and returns
+" the output of the executed command. Target is the real file to be formatted.
+function! zig#fmt#run(bin_name, target)
+  let l:cmd = []
+  call extend(cmd, a:bin_name)
+  call extend(cmd, [a:target])
+  return zig#util#Exec(l:cmd)
+endfunction
+
+" parse_errors parses the given errors and returns a list of parsed errors
+function! s:parse_errors(filename, content) abort
+  let splitted = split(a:content, '\n')
+
+  " list of errors to be put into location list
+  let errors = []
+  for line in splitted
+    let tokens = matchlist(line, '^\(.\{-}\):\(\d\+\):\(\d\+\)\s*\(.*\)')
+    if !empty(tokens)
+      call add(errors,{
+            \"filename": a:filename,
+            \"lnum":     tokens[2],
+            \"col":      tokens[3],
+            \"text":     tokens[4],
+            \ })
+    endif
+  endfor
+
+  return errors
+endfunction
+
+" show_errors opens a location list and shows the given errors. If the given
+" errors is empty, it closes the the location list
+function! s:show_errors(errors) abort
+  let l:listtype = zig#list#Type("ZigFmt")
+  if !empty(a:errors)
+    call zig#list#Populate(l:listtype, a:errors, 'Format')
+    echohl Error | echomsg "zig fmt returned error" | echohl None
+  endif
+
+  " this closes the window if there are no errors or it opens
+  " it if there is any
+  call zig#list#Window(l:listtype, len(a:errors))
+endfunction
+
+function! zig#fmt#ToggleFmtAutoSave() abort
+  if zig#config#FmtAutosave()
+    call zig#config#SetFmtAutosave(0)
+    call zig#util#EchoProgress("auto fmt disabled")
+    return
+  end
+
+  call zig#config#SetFmtAutosave(1)
+  call zig#util#EchoProgress("auto fmt enabled")
+endfunction
+
+" vim: sw=2 ts=2 et