Fix #795 - Handle GCC errors without column numbers

autoload/ale/handlers/gcc.vim

@@ -23,6 +23,7 @@ endfunction
 function! s:RemoveUnicodeQuotes(text) abort
     let l:text = a:text
     let l:text = substitute(l:text, '[`´‘’]', '''', 'g')
+    let l:text = substitute(l:text, '\v\\u2018([^\\]+)\\u2019', '''\1''', 'g')
     let l:text = substitute(l:text, '[“”]', '"', 'g')
 
     return l:text
@@ -50,7 +51,7 @@ function! ale#handlers#gcc#HandleGCCFormat(buffer, lines) abort
     " <stdin>:8:5: warning: conversion lacks type at end of format [-Wformat=]
     " <stdin>:10:27: error: invalid operands to binary - (have ‘int’ and ‘char *’)
     " -:189:7: note: $/${} is unnecessary on arithmetic variables. [SC2004]
-    let l:pattern = '^\(.\+\):\(\d\+\):\(\d\+\): \([^:]\+\): \(.\+\)$'
+    let l:pattern = '\v^([a-zA-Z]?:?[^:]+):(\d+):(\d+)?:? ([^:]+): (.+)$'
     let l:output = []
 
     for l:line in a:lines
@@ -99,12 +100,17 @@ function! ale#handlers#gcc#HandleGCCFormat(buffer, lines) abort
                 continue
             endif
 
-            call add(l:output, {
-            \   'lnum': l:match[2] + 0,
-            \   'col': l:match[3] + 0,
+            let l:item = {
+            \   'lnum': str2nr(l:match[2]),
             \   'type': l:match[4] =~# 'error' ? 'E' : 'W',
             \   'text': s:RemoveUnicodeQuotes(l:match[5]),
-            \})
+            \}
+
+            if !empty(l:match[3])
+                let l:item.col = str2nr(l:match[3])
+            endif
+
+            call add(l:output, l:item)
         endif
     endfor
 

test/handler/test_gcc_handler.vader

@@ -94,3 +94,42 @@ Execute(The GCC handler shouldn't complain about #pragma once for headers):
   \ ale#handlers#gcc#HandleGCCFormat(347, [
   \   '<stdin>:1:1: warning: #pragma once in main file [enabled by default]',
   \ ])
+
+Execute(The GCC handler should handle syntax errors):
+  AssertEqual
+  \ [
+  \   {
+  \     'lnum': 6,
+  \     'col': 12,
+  \     'type': 'E',
+  \     'text': 'invalid suffix "p" on integer constant'
+  \   },
+  \   {
+  \     'lnum': 17,
+  \     'col': 5,
+  \     'type': 'E',
+  \     'text': 'invalid suffix "n" on integer constant'
+  \   },
+  \   {
+  \     'lnum': 4,
+  \     'type': 'E',
+  \     'text': 'variable or field ''foo'' declared void'
+  \   },
+  \   {
+  \     'lnum': 4,
+  \     'type': 'E',
+  \     'text': '''cat'' was not declared in this scope'
+  \   },
+  \   {
+  \     'lnum': 12,
+  \     'type': 'E',
+  \     'text': 'expected '';'' before ''o'''
+  \   },
+  \ ],
+  \ ale#handlers#gcc#HandleGCCFormat(347, [
+  \ '<stdin>:6:12: error: invalid suffix "p" on integer constant',
+  \ '<stdin>:17:5: error: invalid suffix "n" on integer constant',
+  \ '<stdin>:4: error: variable or field ''foo'' declared void',
+  \ '<stdin>:4: error: ''cat'' was not declared in this scope',
+  \ '<stdin>:12: error: expected `;'' before ''o''',
+  \ ])