Added support for hlint

README.md

@@ -39,7 +39,7 @@ name. That seems to be the fairest way to arrange this table.
 | Elixir | [credo](https://github.com/rrrene/credo) |
 | Fortran | [gcc](https://gcc.gnu.org/) |
 | Go | [gofmt -e](https://golang.org/cmd/gofmt/), [go vet](https://golang.org/cmd/vet/), [golint](https://godoc.org/github.com/golang/lint) |
-| Haskell | [ghc](https://www.haskell.org/ghc/) |
+| Haskell | [ghc](https://www.haskell.org/ghc/), [hlint](https://hackage.haskell.org/package/hlint) |
 | HTML | [HTMLHint](http://htmlhint.com/), [tidy](http://www.html-tidy.org/) |
 | JavaScript | [eslint](http://eslint.org/), [jscs](http://jscs.info/), [jshint](http://jshint.com/) |
 | JSON | [jsonlint](http://zaa.ch/jsonlint/) |

ale_linters/haskell/hlint.vim

@@ -0,0 +1,35 @@
+" Author: jparoz <jesse.paroz@gmail.com>
+" Description: hlint for Haskell files
+
+if exists('g:loaded_ale_linters_haskell_hlint')
+    finish
+endif
+
+let g:loaded_ale_linters_haskell_hlint = 1
+
+function! ale_linters#haskell#hlint#Handle(buffer, lines)
+    let l:errors = json_decode(join(a:lines, ""))
+
+    let l:output = []
+
+    for l:error in l:errors
+        " vcol is Needed to indicate that the column is a character.
+        call add(l:output, {
+        \   'bufnr': a:buffer,
+        \   'lnum': l:error.startLine + 0,
+        \   'vcol': 0,
+        \   'col': l:error.startColumn + 0,
+        \   'text': l:error.severity . ': ' . l:error.hint,
+        \   'type': l:error.severity == 'Error' ? 'E' : 'W',
+        \})
+    endfor
+
+    return l:output
+endfunction
+
+call ale#linter#Define('haskell', {
+\   'name': 'hlint',
+\   'executable': 'hlint',
+\   'command': 'hlint --color=never --json -',
+\   'callback': 'ale_linters#haskell#hlint#Handle',
+\})

doc/ale.txt

@@ -59,7 +59,7 @@ The following languages and tools are supported.
 * Elixir: 'credo'
 * Fortran: 'gcc'
 * Go: 'gofmt -e', 'go vet', 'golint'
-* Haskell: 'ghc'
+* Haskell: 'ghc', 'hlint'
 * HTML: 'HTMLHint', 'tidy'
 * JavaScript: 'eslint', 'jscs', 'jshint'
 * JSON: 'jsonlint'