Make shellcheck respect ale_warn_about_trailing_whitespace

autoload/ale/handlers/shellcheck.vim

@@ -63,6 +63,12 @@ function! ale#handlers#shellcheck#GetCommand(buffer, version) abort
     \   . ' -f ' . l:format . ' -'
 endfunction
 
+function! s:ShouldIgnoreErrorCode(buffer, code) abort
+    " Skip warnings for trailing whitespace if the option is off.
+    return a:code is# 'SC1101'
+    \   && !ale#Var(a:buffer, 'warn_about_trailing_whitespace')
+endfunction
+
 function! s:HandleShellcheckJSON(buffer, lines) abort
     try
         let l:errors = json_decode(a:lines[0])
@@ -87,11 +93,17 @@ function! s:HandleShellcheckJSON(buffer, lines) abort
             let l:type = 'W'
         endif
 
+        let l:code = 'SC' . l:error['code']
+
+        if s:ShouldIgnoreErrorCode(a:buffer, l:code)
+            continue
+        endif
+
         let l:item = {
         \   'lnum': l:error['line'],
         \   'type': l:type,
         \   'text': l:error['message'],
-        \   'code': 'SC' . l:error['code'],
+        \   'code': l:code,
         \   'detail': l:error['message'] . "\n\nFor more information:\n  https://www.shellcheck.net/wiki/SC" . l:error['code'],
         \}
 
@@ -107,7 +119,6 @@ function! s:HandleShellcheckJSON(buffer, lines) abort
             let l:item.end_lnum = l:error['endLine']
         endif
 
-
         " If the filename is something like <stdin>, <nofile> or -, then
         " this is an error for the file we checked.
         if has_key(l:error, 'file')
@@ -135,11 +146,17 @@ function! s:HandleShellcheckGCC(buffer, lines) abort
             let l:type = 'W'
         endif
 
+        let l:code = l:match[6]
+
+        if s:ShouldIgnoreErrorCode(a:buffer, l:code)
+            continue
+        endif
+
         let l:item = {
         \   'lnum': str2nr(l:match[2]),
         \   'type': l:type,
         \   'text': l:match[5],
-        \   'code': l:match[6],
+        \   'code': l:code,
         \   'detail': l:match[5] . "\n\nFor more information:\n  https://www.shellcheck.net/wiki/" . l:match[6],
         \}
 

test/handler/test_shellcheck_handler.vader

@@ -1,8 +1,8 @@
 Before:
-  runtime ale_linters/shell/shellcheck.vim
+  Save g:ale_warn_about_trailing_whitespace
 
 After:
-  call ale#linter#Reset()
+  Restore
 
 Execute(The shellcheck handler should handle basic errors or warnings <0.7.0):
   AssertEqual
@@ -150,3 +150,58 @@ Execute(The shellcheck handler should handle info and style >=0.7.0):
   \     ]
   \   }'
   \ ])
+
+Execute(shellcheck errors for trailing whitespace should show by default):
+  AssertEqual
+  \ [
+  \   {
+  \     'lnum': 8,
+  \     'col': 12,
+  \     'code': 'SC1101',
+  \     'end_lnum': 8,
+  \     'type': 'E',
+  \     'end_col': 11,
+  \     'text': 'Delete trailing spaces after \ to break line (or use quotes for literal space).',
+  \     'detail': 'Delete trailing spaces after \ to break line (or use quotes for literal space).' . "\n\nFor more information:\n  https://www.shellcheck.net/wiki/" . 'SC1101',
+  \   },
+  \ ],
+  \ ale#handlers#shellcheck#Handle(bufnr(''), [0, 7, 0], [
+  \   '{
+  \     "comments": [
+  \       {
+  \         "file": "-",
+  \         "line": 8,
+  \         "endLine": 8,
+  \         "column": 12,
+  \         "endColumn": 12,
+  \         "level": "error",
+  \         "code":1101,
+  \         "message":"Delete trailing spaces after \\ to break line (or use quotes for literal space).",
+  \         "fix":null
+  \       }
+  \     ]
+  \   }',
+  \ ])
+
+Execute(shellcheck errors for trailing whitepsace should be able to be silenced by ale_warn_about_trailing_whitespace):
+  let g:ale_warn_about_trailing_whitespace = 0
+
+  AssertEqual
+  \ [],
+  \ ale#handlers#shellcheck#Handle(bufnr(''), [0, 7, 0], [
+  \   '{
+  \     "comments": [
+  \       {
+  \         "file": "-",
+  \         "line": 8,
+  \         "endLine": 8,
+  \         "column": 12,
+  \         "endColumn": 12,
+  \         "level": "error",
+  \         "code":1101,
+  \         "message":"Delete trailing spaces after \\ to break line (or use quotes for literal space).",
+  \         "fix":null
+  \       }
+  \     ]
+  \   }',
+  \ ])