Add mix linter for elixir

3 files changed, 44 insertions, 2 deletions

diff --git a/README.md b/README.md
index f9233db3..d2769083 100644
--- a/README.md
+++ b/README.md
@@ -108,7 +108,7 @@ formatting.
 | Dafny | [dafny](https://rise4fun.com/Dafny) !! |
 | Dart | [dartanalyzer](https://github.com/dart-lang/sdk/tree/master/pkg/analyzer_cli) !!, [language_server](https://github.com/natebosch/dart_language_server) |
 | Dockerfile | [hadolint](https://github.com/hadolint/hadolint) |
-| Elixir | [credo](https://github.com/rrrene/credo), [dialyxir](https://github.com/jeremyjh/dialyxir), [dogma](https://github.com/lpil/dogma) !!|
+| Elixir | [credo](https://github.com/rrrene/credo), [dialyxir](https://github.com/jeremyjh/dialyxir), [dogma](https://github.com/lpil/dogma), [mix](https://hexdocs.pm/mix/Mix.html) !!|
 | Elm | [elm-format](https://github.com/avh4/elm-format), [elm-make](https://github.com/elm-lang/elm-make) |
 | Erb | [erb](https://apidock.com/ruby/ERB), [erubi](https://github.com/jeremyevans/erubi), [erubis](https://github.com/kwatch/erubis) |
 | Erlang | [erlc](http://erlang.org/doc/man/erlc.html), [SyntaxErl](https://github.com/ten0s/syntaxerl) |
diff --git a/ale_linters/elixir/mix.vim b/ale_linters/elixir/mix.vim
new file mode 100644
index 00000000..41cd18a0
--- /dev/null
+++ b/ale_linters/elixir/mix.vim
@@ -0,0 +1,42 @@
+" Author: evnu - https://github.com/evnu
+" Author: colbydehart - https://github.com/colbydehart
+
+function! ale_linters#elixir#mix#Handle(buffer, lines) abort
+    " Matches patterns like the following:
+    "
+    " Error format
+    " ** (CompileError) apps/sim/lib/sim/server.ex:87: undefined function update_in/4
+    "
+    " TODO: Warning format
+    " warning: variable "foobar" does not exist and is being expanded to "foobar()", please use parentheses to remove the ambiguity or change the variable name
+
+    let l:pattern = '\v\(([^\)]+Error)\) ([^:]+):([^:]+): (.+)$'
+    let l:output = []
+
+    for l:match in ale#util#GetMatches(a:lines, l:pattern)
+        let l:type = 'E'
+        let l:text = l:match[4]
+
+        call add(l:output, {
+        \   'bufnr': a:buffer,
+        \   'lnum': l:match[3] + 0,
+        \   'col': 0,
+        \   'type': l:type,
+        \   'text': l:text,
+        \})
+    endfor
+
+    return l:output
+endfunction
+
+function! ale_linters#elixir#mix#Command(buffer) abort
+    let l:project_dir = fnamemodify(ale#path#FindNearestFile(a:buffer, 'mix.exs'), ':h')
+    return  'cd ' . l:project_dir . ' && mix compile %s'
+endfunction
+
+call ale#linter#Define('elixir', {
+\   'name': 'mix',
+\   'executable': 'mix',
+\   'command_callback': 'ale_linters#elixir#mix#Command',
+\   'callback': 'ale_linters#elixir#mix#Handle',
+\})
diff --git a/doc/ale.txt b/doc/ale.txt
index 0bf1c849..24a41106 100644
--- a/doc/ale.txt
+++ b/doc/ale.txt
@@ -332,7 +332,7 @@ Notes:
 * Dafny: `dafny`!!
 * Dart: `dartanalyzer`!!, `language_server`
 * Dockerfile: `hadolint`
-* Elixir: `credo`, `dialyxir`, `dogma`!!
+* Elixir: `credo`, `dialyxir`, `dogma`, `mix`!!
 * Elm: `elm-format, elm-make`
 * Erb: `erb`, `erubi`, `erubis`
 * Erlang: `erlc`, `SyntaxErl`