Merge pull request #2268 from m-pilia/alex

Add settings for the Alex linter

autoload/ale/handlers/alex.vim

@@ -1,10 +1,23 @@
 " Author: Johannes Wienke <languitar@semipol.de>
 " Description: Error handling for errors in alex output format
 
+function! ale#handlers#alex#GetExecutable(buffer) abort
+    return ale#node#FindExecutable(a:buffer, 'alex', [
+    \   'node_modules/.bin/alex',
+    \   'node_modules/alex/cli.js',
+    \])
+endfunction
+
+function! ale#handlers#alex#CreateCommandCallback(flags) abort
+    return {b -> ale#node#Executable(b, ale#handlers#alex#GetExecutable(b))
+    \            . ' %s '
+    \            . a:flags}
+endfunction
+
 function! ale#handlers#alex#Handle(buffer, lines) abort
     " Example output:
     "       6:256-6:262  warning  Be careful with “killed”, it’s profane in some cases      killed           retext-profanities
-    let l:pattern = '^ *\(\d\+\):\(\d\+\)-\(\d\+\):\(\d\+\) \+warning \+\(.\{-\}\)  \+\(.\{-\}\)  \+\(.\{-\}\)$'
+    let l:pattern = '\v^ *(\d+):(\d+)-(\d+):(\d+) +warning +(.{-})  +(.{-})  +(.{-})$'
     let l:output = []
 
     for l:match in ale#util#GetMatches(a:lines, l:pattern)
@@ -20,3 +33,21 @@ function! ale#handlers#alex#Handle(buffer, lines) abort
 
     return l:output
 endfunction
+
+" Define a linter for a specific filetype. Accept flags to adapt to the filetype.
+"    no flags  treat input as markdown
+"    --html    treat input as HTML
+"    --text    treat input as plaintext
+function! ale#handlers#alex#DefineLinter(filetype, flags) abort
+    call ale#Set('alex_executable', 'alex')
+    call ale#Set('alex_use_global', get(g:, 'ale_use_global_executables', 0))
+
+    call ale#linter#Define(a:filetype, {
+    \   'name': 'alex',
+    \   'executable_callback': 'ale#handlers#alex#GetExecutable',
+    \   'command_callback': ale#handlers#alex#CreateCommandCallback(a:flags),
+    \   'output_stream': 'stderr',
+    \   'callback': 'ale#handlers#alex#Handle',
+    \   'lint_file': 1,
+    \})
+endfunction