Add coffeelint for coffeescript

README.md

@@ -31,6 +31,7 @@ name. That seems to be the fairest way to arrange this table.
 | Bash | [-n flag](https://www.gnu.org/software/bash/manual/bash.html#index-set) |
 | Bourne Shell | [-n flag](http://linux.die.net/man/1/sh) |
 | C | [gcc](https://gcc.gnu.org/) |
+| CoffeeScript | [coffeelint](https://www.npmjs.com/package/coffeelint) |
 | D | [dmd](https://dlang.org/dmd-linux.html)^ |
 | Fortran | [gcc](https://gcc.gnu.org/) |
 | Haskell | [ghc](https://www.haskell.org/ghc/)^ |

ale_linters/coffee/coffeelint.vim

@@ -0,0 +1,51 @@
+" Author: prashcr - https://github.com/prashcr
+
+if exists('g:loaded_ale_linters_coffee_coffeelint')
+    finish
+endif
+
+let g:loaded_ale_linters_coffee_coffeelint = 1
+
+function! ale_linters#coffee#coffeelint#Handle(buffer, lines)
+    " Matches patterns like the following:
+    "
+    " path,lineNumber,lineNumberEnd,level,message
+    " stdin,14,,error,Throwing strings is forbidden
+    " 
+    " Note that we currently ignore lineNumberEnd for multiline errors
+    let pattern = 'stdin,\(\d\+\),\(\d*\),\(.\+\),\(.\+\)'
+    let output = []
+
+    for line in a:lines
+        let l:match = matchlist(line, pattern)
+
+        if len(l:match) == 0
+            continue
+        endif
+
+        let line = l:match[1] + 0
+        let column = 1
+        let type = l:match[3] ==# 'error' ? 'error' : 'warn'
+        let text = type . ': ' . l:match[4]
+
+        " vcol is needed to indicate that the column is a character
+        call add(output, {
+        \   'bufnr': a:buffer,
+        \   'lnum': line,
+        \   'vcol': 0,
+        \   'col': column,
+        \   'text': text,
+        \   'type': type,
+        \   'nr': -1,
+        \})
+    endfor
+
+    return output
+endfunction
+
+call ALEAddLinter('coffee', {
+\   'name': 'coffeelint',
+\   'executable': 'coffeelint',
+\   'command': 'coffeelint --stdin --reporter csv',
+\   'callback': 'ale_linters#coffee#coffeelint#Handle',
+\})