Detect and use CM files for smlnj (#884)

* Detect and use CM files for smlnj

* Split into two checkers

- one for CM projects
- one for single SML files

* Fix some typos

* Fix error caught by writing tests

We want to actually use `glob` to search in paths upwards from us.
(Previously we were just searching in the current directory every time!)

* Fix errors from former test run

* Write tests for GetCmFile and GetExecutableSmlnj

* Typo in 'smlnj/' fixture filenames

ale_linters/sml/smlnj.vim

@@ -1,47 +1,9 @@
-" Author: Paulo Alem    <paulo.alem@gmail.com>
-" Description: Rudimentary SML checking with smlnj compiler
-
-function! ale_linters#sml#smlnj#Handle(buffer, lines) abort
-    " Try to match basic sml errors
-
-    let l:out = []
-    let l:pattern = '^.*\:\([0-9\.]\+\)\ \(\w\+\)\:\ \(.*\)'
-    let l:pattern2 = '^.*\:\([0-9]\+\)\.\?\([0-9]\+\).* \(\(Warning\|Error\): .*\)'
-
-    for l:line in a:lines
-        let l:match2 = matchlist(l:line, l:pattern2)
-
-        if len(l:match2) != 0
-          call add(l:out, {
-          \   'bufnr': a:buffer,
-          \   'lnum': l:match2[1] + 0,
-          \   'col' : l:match2[2] - 1,
-          \   'text': l:match2[3],
-          \   'type': l:match2[3] =~# '^Warning' ? 'W' : 'E',
-          \})
-          continue
-        endif
-
-        let l:match = matchlist(l:line, l:pattern)
-
-        if len(l:match) != 0
-          call add(l:out, {
-          \   'bufnr': a:buffer,
-          \   'lnum': l:match[1] + 0,
-          \   'text': l:match[2] . ': ' . l:match[3],
-          \   'type': l:match[2] is# 'error' ? 'E' : 'W',
-          \})
-          continue
-        endif
-
-    endfor
-
-    return l:out
-endfunction
+" Author: Paulo Alem <paulo.alem@gmail.com>, Jake Zimmerman <jake@zimmerman.io>
+" Description: Single-file SML checking with SML/NJ compiler
 
 call ale#linter#Define('sml', {
 \   'name': 'smlnj',
-\   'executable': 'sml',
+\   'executable_callback': 'ale#handlers#sml#GetExecutableSmlnjFile',
 \   'command': 'sml',
-\   'callback': 'ale_linters#sml#smlnj#Handle',
+\   'callback': 'ale#handlers#sml#Handle',
 \})

ale_linters/sml/smlnj_cm.vim

@@ -0,0 +1,25 @@
+" Author: Jake Zimmerman <jake@zimmerman.io>
+" Description: SML checking with SML/NJ Compilation Manager
+
+" Let user manually set the CM file (in case our search for a CM file is
+" ambiguous and picks the wrong one)
+"
+" See :help ale-sml-smlnj for more information.
+call ale#Set('sml_smlnj_cm_file', '*.cm')
+
+function! ale_linters#sml#smlnj_cm#GetCommand(buffer) abort
+    let l:cmfile = ale#handlers#sml#GetCmFile(a:buffer)
+    return 'sml -m ' . l:cmfile . ' < /dev/null'
+endfunction
+
+" Using CM requires that we set "lint_file: 1", since it reads the files
+" from the disk itself.
+call ale#linter#Define('sml', {
+\   'name': 'smlnj-cm',
+\   'executable_callback': 'ale#handlers#sml#GetExecutableSmlnjCm',
+\   'lint_file': 1,
+\   'command_callback': 'ale_linters#sml#smlnj_cm#GetCommand',
+\   'callback': 'ale#handlers#sml#Handle',
+\})
+
+" vim:ts=4:sts=4:sw=4