feat: fecs support for js/html/css lint and format

`fecs` is a lint tool for HTML/CSS/JavaScript,
see http://fecs.baidu.com for more options.

autoload/ale/fix/registry.vim

@@ -27,6 +27,11 @@ let s:default_registry = {
 \       'suggested_filetypes': ['python'],
 \       'description': 'Fix PEP8 issues with black.',
 \   },
+\   'fecs': {
+\       'function': 'ale#fixers#fecs#Fix',
+\       'suggested_filetypes': ['javascript', 'css', 'html'],
+\       'description': 'Apply fecs format to a file.',
+\   },
 \   'tidy': {
 \       'function': 'ale#fixers#tidy#Fix',
 \       'suggested_filetypes': ['html'],

autoload/ale/fixers/fecs.vim

@@ -0,0 +1,20 @@
+" Author: harttle <yangjvn@126.com>
+" Description: Apply fecs format to a file.
+
+call ale#Set('html_fecs_executable', 'fecs')
+call ale#Set('html_fecs_use_global', get(g:, 'ale_use_global_executables', 0))
+
+function! ale#fixers#fecs#Fix(buffer) abort
+    let l:executable = ale#handlers#fecs#GetExecutable(a:buffer)
+
+    if !executable(l:executable)
+        return 0
+    endif
+
+    let l:config_options = ' format --replace=true'
+
+    return {
+    \   'command': ale#Escape(l:executable) . l:config_options . ' %t',
+    \   'read_temporary_file': 1,
+    \}
+endfunction

autoload/ale/handlers/fecs.vim

@@ -0,0 +1,52 @@
+" Author: harttle <yangjvn@126.com>
+" Description: fecs http://fecs.baidu.com/
+
+call ale#Set('javascript_fecs_executable', 'fecs')
+call ale#Set('javascript_fecs_use_global', get(g:, 'ale_use_global_executables', 0))
+
+function! ale#handlers#fecs#GetCommand(buffer) abort
+    return '%e check --colors=false --rule=true %t'
+endfunction
+
+function! ale#handlers#fecs#GetExecutable(buffer) abort
+    return ale#node#FindExecutable(a:buffer, 'javascript_fecs', [
+    \   'node_modules/.bin/fecs',
+    \   'node_modules/fecs/bin/fecs',
+    \])
+endfunction
+
+function! ale#handlers#fecs#Handle(buffer, lines) abort
+    " Matches patterns looking like the following
+    "
+    " fecs  WARN → line 20, col 25: Unexpected console statement.     (no-console)
+    " fecs ERROR → line 24, col 36: Missing radix parameter.  (radix)
+    "
+    let l:pattern = '\v^.*(WARN|ERROR)\s+→\s+line (\d+),\s+col\s+(\d+):\s+(.*)$'
+    let l:output = []
+
+    for l:match in ale#util#GetMatches(a:lines, l:pattern)
+        let l:obj = {
+        \   'lnum': l:match[2] + 0,
+        \   'col': l:match[3] + 0,
+        \   'text': l:match[4]
+        \}
+
+        let l:code_match = matchlist(l:match[4], '\v^(.{-})\s*\((.+)\)$')
+
+        if !empty(l:code_match)
+            let l:obj.code = l:code_match[2]
+            let l:obj.text = l:code_match[1]
+        endif
+
+        if l:match[1] ==# 'WARN'
+            let l:obj.type = 'W'
+        elseif l:match[1] ==# 'ERROR'
+            let l:obj.type = 'E'
+        endif
+
+        call add(l:output, l:obj)
+    endfor
+
+    return l:output
+endfunction
+