Refactor SyntaxErl linter file (#4807)

ale_linters/erlang/syntaxerl.vim

@@ -3,29 +3,13 @@
 
 call ale#Set('erlang_syntaxerl_executable', 'syntaxerl')
 
-function! ale_linters#erlang#syntaxerl#RunHelpCommand(buffer) abort
-    let l:executable = ale#Var(a:buffer, 'erlang_syntaxerl_executable')
-
-    return ale#command#Run(
-    \   a:buffer,
-    \   ale#Escape(l:executable) . ' -h',
-    \   function('ale_linters#erlang#syntaxerl#GetCommand'),
-    \)
-endfunction
-
-function! ale_linters#erlang#syntaxerl#GetCommand(buffer, output, meta) abort
-    let l:use_b_option = match(a:output, '\C\V-b, --base\>') > -1
-
-    return '%e' . (l:use_b_option ? ' -b %s %t' : ' %t')
-endfunction
-
 function! ale_linters#erlang#syntaxerl#Handle(buffer, lines) abort
     let l:pattern = '\v\C:(\d+):( warning:)? (.+)'
     let l:loclist = []
 
     for l:match in ale#util#GetMatches(a:lines, l:pattern)
         call add(l:loclist, {
-        \   'lnum': l:match[1] + 0,
+        \   'lnum': str2nr(l:match[1]),
         \   'text': l:match[3],
         \   'type': empty(l:match[2]) ? 'E' : 'W',
         \})
@@ -34,9 +18,27 @@ function! ale_linters#erlang#syntaxerl#Handle(buffer, lines) abort
     return l:loclist
 endfunction
 
+function! s:GetExecutable(buffer) abort
+    return ale#Var(a:buffer, 'erlang_syntaxerl_executable')
+endfunction
+
+function! s:GetCommand(buffer) abort
+    let l:Callback = function('s:GetCommandFromHelpOutput')
+
+    return ale#command#Run(a:buffer, '%e -h', l:Callback, {
+    \   'executable': s:GetExecutable(a:buffer),
+    \})
+endfunction
+
+function! s:GetCommandFromHelpOutput(buffer, output, metadata) abort
+    let l:has_b_option = match(a:output, '\V\C-b, --base\>') > -1
+
+    return l:has_b_option ? '%e -b %s %t' : '%e %t'
+endfunction
+
 call ale#linter#Define('erlang', {
 \   'name': 'syntaxerl',
-\   'executable': {b -> ale#Var(b, 'erlang_syntaxerl_executable')},
-\   'command': {b -> ale_linters#erlang#syntaxerl#RunHelpCommand(b)},
 \   'callback': 'ale_linters#erlang#syntaxerl#Handle',
+\   'executable': function('s:GetExecutable'),
+\   'command': function('s:GetCommand'),
 \})

test/linter/test_erlang_syntaxerl.vader

@@ -11,11 +11,11 @@ Execute (The default commands should be correct):
   \]
 
 Execute (The executable should be configurable):
-  let b:ale_erlang_syntaxerl_executable = 'foobar'
+  let b:ale_erlang_syntaxerl_executable = '/path/to/syntaxerl'
 
-  AssertLinter 'foobar', [
-  \ ale#Escape('foobar') . ' -h',
-  \ ale#Escape('foobar') . ' %t',
+  AssertLinter '/path/to/syntaxerl', [
+  \ ale#Escape('/path/to/syntaxerl') . ' -h',
+  \ ale#Escape('/path/to/syntaxerl') . ' %t',
   \]
 
 Execute (The -b option should be used when available):