Add formatter for lua 5.1

luaformatterfiveone is a formatter for Lua 5.1.  It is readily available
through standard via `luarocks install formatterfiveone`.

Author: ElPiloto

Diff for: autoload/codefmt/luaformatterfiveone.vim

@@ -0,0 +1,75 @@
+" Copyright 2017 Google Inc. All rights reserved.
+"
+" Licensed under the Apache License, Version 2.0 (the "License");
+" you may not use this file except in compliance with the License.
+" You may obtain a copy of the License at
+"
+"     http://www.apache.org/licenses/LICENSE-2.0
+"
+" Unless required by applicable law or agreed to in writing, software
+" distributed under the License is distributed on an "AS IS" BASIS,
+" WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+" See the License for the specific language governing permissions and
+" limitations under the License.
+
+
+let s:plugin = maktaba#plugin#Get('codefmt')
+
+
+""
+" @private
+"
+" Formatter provider for lua files using luaformatterfiveone.
+function! codefmt#luaformatterfiveone#GetFormatter() abort
+  let l:formatter = {
+      \ 'name': 'luaformatterfiveone',
+      \ 'setup_instructions': 'Install luaformatterfiveone with luarocks. ' .
+          \ '(https://luarocks.org/modules/ElPiloto/formatterfiveone).'}
+
+  function l:formatter.IsAvailable() abort
+    return executable(s:plugin.Flag('luaformatterfiveone_executable'))
+  endfunction
+
+  function l:formatter.AppliesToBuffer() abort
+    return &filetype is# 'lua'
+  endfunction
+
+  ""
+  " Reformat the current buffer with luaformatterfiveone or the binary named in
+  " @flag(luaformatterfiveone)
+  " @throws ShellError
+  function l:formatter.Format() abort
+    let l:cmd = [ s:plugin.Flag('luaformatterfiveone_executable')]
+	" Specify we are sending input through stdin
+    let l:cmd += ['-i']
+
+    try
+      call codefmt#formatterhelpers#Format(l:cmd)
+    catch
+      " Parse all the errors and stick them in the quickfix list.
+      let l:errors = []
+      for line in split(v:exception, "\n")
+        let l:fname_pattern = 'stdin'
+        let l:tokens = matchlist(line,
+            \ '\C\v^\[string "isCodeValid"\]:(\d+): (.*)')
+        if !empty(l:tokens)
+          call add(l:errors, {
+              \ "filename": @%,
+              \ "lnum": l:tokens[1],
+              \ "text": l:tokens[2]})
+        endif
+              "\ "col": l:tokens[2],
+      endfor
+
+      if empty(l:errors)
+        " Couldn't parse buildifier error format; display it all.
+        call maktaba#error#Shout('Error formatting file: %s', v:exception)
+      else
+        call setqflist(l:errors, 'r')
+        cc 1
+      endif
+    endtry
+  endfunction
+
+  return l:formatter
+endfunction

Diff for: instant/flags.vim

@@ -172,3 +172,7 @@ call s:plugin.Flag('fish_indent_executable', 'fish_indent')
 ""
 " The path to the nixpkgs-fmt executable.
 call s:plugin.Flag('nixpkgs_fmt_executable', 'nixpkgs-fmt')
+
+""
+" The path to the luaformatterfiveone executable.
+call s:plugin.Flag('luaformatterfiveone_executable', 'luaformatterfiveone')

Diff for: plugin/register.vim

@@ -39,3 +39,4 @@ call s:registry.AddExtension(codefmt#shfmt#GetFormatter())
 call s:registry.AddExtension(codefmt#zprint#GetFormatter())
 call s:registry.AddExtension(codefmt#fish_indent#GetFormatter())
 call s:registry.AddExtension(codefmt#nixpkgs_fmt#GetFormatter())
+call s:registry.AddExtension(codefmt#luaformatterfiveone#GetFormatter())

Diff for: vroom/luaformatterfiveone.vroom

@@ -0,0 +1,53 @@
+luaformatterfiveone" formatter only knows how to format lua 5.1 code.
+If you aren't familiar with basic codefmt usage yet, see main.vroom
+
+We'll set up codefmt and configure the vroom environment, then jump into some
+examples.
+
+  :source $VROOMDIR/setupvroom.vim
+
+  :let g:repeat_calls = []
+  :function FakeRepeat(...)<CR>
+  |  call add(g:repeat_calls, a:000)<CR>
+  :endfunction
+  :call maktaba#test#Override('repeat#set', 'FakeRepeat')
+
+  :call codefmt#SetWhetherToPerformIsAvailableChecksForTesting(0)
+
+
+luaformatterfiveone expects the lua formatterfiveone executable to be installed
+on your system.
+
+  % function hello()
+  % print("world")
+  % end
+  :FormatCode luaformatterfiveone
+  ! luaformatterfiveone -i 2> .*
+  $ function hello()
+  $   print("world")
+  $ end
+
+The name or path of the luaformatterfiveone executable can be configured via the
+luaformatterfiveone_executable flag if the default of "buildifier" doesn't work.
+
+  :Glaive codefmt luaformatterfiveone_executable='myluaformatterfiveone'
+  :FormatCode luaformatterfiveone
+  ! myluaformatterfiveone -i 2> .*
+  $ function hello()
+  $   print("world")
+  $ end
+  :Glaive codefmt luaformatterfiveone_executable='luaformatterfiveone'
+
+Errors are reported using the quickfix list.
+
+  @clear
+  % 13()
+  :FormatCode luaformatterfiveone
+  ! luaformatterfiveone -i 2> .*
+  ~ (1 of 1): unexpected symbol near '13'
+  :echomsg line('.') . ',' . col('.')
+  ~ 1,1
+  :echomsg string(map(getqflist(),
+  |'v:val.lnum . "," . v:val.text'))
+  ~ ['1,unexpected symbol near ''13''']
+