Merge pull request #1017 from carakan/elixir_format

`mix format` new fixer for elixir lang

autoload/ale/fix/registry.vim

@@ -27,6 +27,11 @@ let s:default_registry = {
 \       'suggested_filetypes': ['javascript', 'typescript'],
 \       'description': 'Apply eslint --fix to a file.',
 \   },
+\   'mix_format': {
+\       'function': 'ale#fixers#mix_format#Fix',
+\       'suggested_filetypes': ['elixir'],
+\       'description': 'Apply mix format to a file.',
+\   },
 \   'format': {
 \       'function': 'ale#fixers#format#Fix',
 \       'suggested_filetypes': ['elm'],

autoload/ale/fixers/mix_format.vim

@@ -0,0 +1,16 @@
+" Author: carakan <carakan@gmail.com>
+" Description: Fixing files with elixir formatter 'mix format'.
+
+call ale#Set('elixir_mix_executable', 'mix')
+
+function! ale#fixers#mix_format#GetExecutable(buffer) abort
+    return ale#Var(a:buffer, 'elixir_mix_executable')
+endfunction
+
+function! ale#fixers#mix_format#Fix(buffer) abort
+    return {
+    \   'command': ale#Escape(ale#fixers#mix_format#GetExecutable(a:buffer))
+    \       . ' format %t',
+    \   'read_temporary_file': 1,
+    \}
+endfunction

doc/ale-elixir.txt

@@ -0,0 +1,17 @@
+===============================================================================
+ALE Elixir Integration                                     *ale-elixir-options*
+
+
+===============================================================================
+mix                                                            *ale-elixir-mix*
+
+g:ale_elixir_mix_options                             *g:ale_elixir_mix_options*
+                                                     *b:ale_elixir_mix_options*
+  Type: |String|
+  Default: `'mix'`
+
+
+  This variable can be changed to specify the mix executable.
+
+===============================================================================
+  vim:tw=78:ts=2:sts=2:sw=2:ft=help:norl:

doc/ale.txt

@@ -48,6 +48,8 @@ CONTENTS                                                         *ale-contents*
       dartanalyzer........................|ale-dart-dartanalyzer|
     dockerfile............................|ale-dockerfile-options|
       hadolint............................|ale-dockerfile-hadolint|
+    elixir................................|ale-elixir-options|
+      mix.................................|ale-elixir-mix|
     elm...................................|ale-elm-options|
       elm-format..........................|ale-elm-elm-format|
       elm-make............................|ale-elm-elm-make|

test/fixers/test_mix_format_fixer_callback.vader

@@ -0,0 +1,20 @@
+Before:
+  call ale#test#SetDirectory('/testplugin/test/fixers')
+  Save g:ale_elixir_mix_executable
+
+  let g:ale_elixir_mix_executable = 'xxxinvalid'
+
+After:
+  call ale#test#RestoreDirectory()
+
+Execute(The mix_format callback should return the correct default values):
+  call ale#test#SetFilename('../elixir-test-files/testfile.ex')
+
+  AssertEqual
+  \ {
+  \   'read_temporary_file': 1,
+  \   'command': ale#Escape('xxxinvalid')
+  \     . ' format %t',
+  \ },
+  \ ale#fixers#mix_format#Fix(bufnr(''))
+