Add sml support via smlnj

README.md

@@ -88,6 +88,7 @@ name. That seems to be the fairest way to arrange this table.
 | SASS | [sass-lint](https://www.npmjs.com/package/sass-lint), [stylelint](https://github.com/stylelint/stylelint) |
 | SCSS | [sass-lint](https://www.npmjs.com/package/sass-lint), [scss-lint](https://github.com/brigade/scss-lint), [stylelint](https://github.com/stylelint/stylelint) |
 | Scala | [scalac](http://scala-lang.org) |
+| SML | [smlnj](http://www.smlnj.org/) |
 | Swift | [swiftlint](https://swift.org/) |
 | Tex | [proselint](http://proselint.com/) |
 | Text^^ | [proselint](http://proselint.com/) |

ale_linters/sml/smlnj.vim

@@ -0,0 +1,42 @@
+" Author: Paulo Alem    <paulo.alem@gmail.com>
+" Description: Rudimentary SML checking with smlnj compiler
+
+if exists('g:loaded_ale_sml_smlnj_checker')
+    finish
+endif
+
+let g:loaded_ale_sml_smlnj_checker = 1
+
+function! ale_linters#sml#smlnj#Handle(buffer, lines) abort
+    " Try to match basic sml errors
+
+    let l:out = []
+    let l:pattern = '^.*\:\([0-9\.]\+\)\ \(\w\+\)\:\ \(.*\)'
+
+    for l:line in a:lines
+        let l:match = matchlist(l:line, l:pattern)
+
+        if len(l:match) == 0
+            continue
+        endif
+
+        call add(l:out, {
+        \   'bufnr': a:buffer,
+        \   'lnum': l:match[1] + 0,
+        \   'vcol': 0,
+        \   'col': 1,
+        \   'text': l:match[2] . ': ' . l:match[3],
+        \   'type': l:match[2] ==# 'error' ? 'E' : 'W',
+        \   'nr': -1,
+        \})
+    endfor
+
+    return l:out
+endfunction
+
+call g:ale#linter#Define('sml', {
+\   'name': 'smlnj',
+\   'executable': 'sml',
+\   'command': 'sml',
+\   'callback': 'ale_linters#sml#smlnj#Handle',
+\})

doc/ale.txt

@@ -109,6 +109,7 @@ The following languages and tools are supported.
 * SASS: 'sasslint', 'stylelint'
 * SCSS: 'sasslint', 'scsslint', 'stylelint'
 * Scala: 'scalac'
+* SML: 'smlnj'
 * Swift: 'swiftlint'
 * Tex: 'proselint'
 * Text: 'proselint'