#392 Report errors inside of headers, in a very basic way

autoload/ale/handlers.vim

@@ -45,36 +45,6 @@ function! ale#handlers#HandleUnixFormatAsWarning(buffer, lines) abort
     return s:HandleUnixFormat(a:buffer, a:lines, 'W')
 endfunction
 
-function! ale#handlers#HandleGCCFormat(buffer, lines) abort
-    " Look for lines like the following.
-    "
-    " <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:output = []
-
-    for l:line in a:lines
-        let l:match = matchlist(l:line, l:pattern)
-
-        if len(l:match) == 0
-            continue
-        endif
-
-        call add(l:output, {
-        \   'bufnr': a:buffer,
-        \   'lnum': l:match[1] + 0,
-        \   'vcol': 0,
-        \   'col': l:match[2] + 0,
-        \   'text': l:match[4],
-        \   'type': l:match[3] =~# 'error' ? 'E' : 'W',
-        \   'nr': -1,
-        \})
-    endfor
-
-    return l:output
-endfunction
-
 function! ale#handlers#HandleCppCheckFormat(buffer, lines) abort
     " Look for lines like the following.
     "

autoload/ale/handlers/gcc.vim

@@ -0,0 +1,78 @@
+scriptencoding utf-8
+" Author: w0rp <devw0rp@gmail.com>
+" Description: This file defines a handler function which ought to work for
+" any program which outputs errors in the format that GCC uses.
+
+function! s:AddIncludedErrors(output, include_lnum, include_lines) abort
+    if a:include_lnum > 0
+        call add(a:output, {
+        \   'lnum': a:include_lnum,
+        \   'type': 'E',
+        \   'text': 'Problems were found in the header (See :ALEDetail)',
+        \   'detail': join(a:include_lines, "\n"),
+        \})
+    endif
+endfunction
+
+function! ale#handlers#gcc#HandleGCCFormat(buffer, lines) abort
+    let l:include_pattern = '\v^(In file included | *)from [^:]*:(\d+)'
+    let l:include_lnum = 0
+    let l:include_lines = []
+    let l:included_filename = ''
+    " Look for lines like the following.
+    "
+    " <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:output = []
+
+    for l:line in a:lines
+        let l:match = matchlist(l:line, l:pattern)
+
+        if empty(l:match)
+            " Check for matches in includes.
+            " We will keep matching lines until we hit the last file, which
+            " is our file.
+            let l:include_match = matchlist(l:line, l:include_pattern)
+
+            if empty(l:include_match)
+                " If this isn't another include header line, then we
+                " need to collect it.
+                call add(l:include_lines, l:line)
+            else
+                " Get the line number out of the parsed include line,
+                " and reset the other variables.
+                let l:include_lnum = str2nr(l:include_match[2])
+                let l:include_lines = []
+                let l:included_filename = ''
+            endif
+        elseif l:include_lnum > 0
+        \&& (empty(l:included_filename) || l:included_filename ==# l:match[1])
+            " If we hit the first error after an include header, or the
+            " errors below have the same name as the first filename we see,
+            " then include these lines, and remember what that filename was.
+            let l:included_filename = l:match[1]
+            call add(l:include_lines, l:line)
+        else
+            " If we hit a regular error again, then add the previously
+            " collected lines as one error, and reset the include variables.
+            call s:AddIncludedErrors(l:output, l:include_lnum, l:include_lines)
+            let l:include_lnum = 0
+            let l:include_lines = []
+            let l:included_filename = ''
+
+            call add(l:output, {
+            \   'lnum': l:match[2] + 0,
+            \   'col': l:match[3] + 0,
+            \   'type': l:match[4] =~# 'error' ? 'E' : 'W',
+            \   'text': l:match[5],
+            \})
+        endif
+    endfor
+
+    " Add remaining include errors after we go beyond the last line.
+    call s:AddIncludedErrors(l:output, l:include_lnum, l:include_lines)
+
+    return l:output
+endfunction