Add support for ASM files using GCC

.gitignore

@@ -2,3 +2,4 @@
 /doc/tags
 .*
 *.obj
+tags

README.md

@@ -52,6 +52,7 @@ name. That seems to be the fairest way to arrange this table.
 
 | Language | Tools |
 | -------- | ----- |
+| ASM | [gcc](https://gcc.gnu.org) |
 | Ansible | [ansible-lint](https://github.com/willthames/ansible-lint) |
 | AsciiDoc | [proselint](http://proselint.com/)|
 | Bash | [-n flag](https://www.gnu.org/software/bash/manual/bash.html#index-set), [shellcheck](https://www.shellcheck.net/) |

ale_linters/asm/gcc.vim

@@ -0,0 +1,44 @@
+" Author: Lucas Kolstad <lkolstad@uw.edu>
+" Description: gcc linter for asm files
+
+let g:ale_asm_gcc_options =
+\   get(g:, 'ale_asm_gcc_options', '-Wall')
+
+function! ale_linters#asm#gcc#GetCommand(buffer) abort
+  return 'gcc -x assembler -fsyntax-only '
+  \    . '-iquote ' . fnameescape(fnamemodify(bufname(a:buffer), ':p:h'))
+  \    . ' ' . g:ale_asm_gcc_options . ' -'
+endfunction
+
+function! ale_linters#asm#gcc#Handle(buffer, lines) abort
+  let l:pattern = '^.\+:\(\d\+\): \([^:]\+\): \(.\+\)$'
+  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': 0,
+    \ 'text': l:match[3],
+    \ 'type': l:match[2] =~? 'error' ? 'E' : 'W',
+    \ 'nr': -1,
+    \})
+  endfor
+
+  return l:output
+endfunction
+
+call ale#linter#Define('asm', {
+\    'name': 'gcc',
+\    'output_stream': 'stderr',
+\    'executable': 'gcc',
+\    'command_callback': 'ale_linters#asm#gcc#GetCommand',
+\    'callback': 'ale_linters#asm#gcc#Handle',
+\})

doc/ale.txt

@@ -43,6 +43,7 @@ CONTENTS                                                         *ale-contents*
     4.31. yamllint........................|ale-linter-options-yamllint|
     4.32. cmakelint.......................|ale-linter-options-cmakelint|
     4.33. perl-perl.......................|ale-linter-options-perl-perl|
+    4.34. asm-gcc.........................|ale-linter-options-asm-gcc|
   5. Linter Integration Notes.............|ale-linter-integration|
     5.1.  merlin..........................|ale-linter-integration-ocaml-merlin|
     5.2. rust.............................|ale-integration-rust|
@@ -74,6 +75,7 @@ ALE supports the following key features:
 
 The following languages and tools are supported.
 
+* ASM: 'gcc'
 * Ansible: 'ansible-lint'
 * Asciidoc: 'proselint'
 * Bash: 'shell' (-n flag), 'shellcheck'
@@ -1120,6 +1122,16 @@ g:ale_perl_perl_options                               *g:ale_perl_perl_options*
   This variable can be changed to alter the command-line arguments to the perl
   invocation.
 
+-------------------------------------------------------------------------------
+4.34. asm-gcc                                      *ale-linter-options-asm-gcc*
+
+g:ale_asm_gcc_options                                   *g:ale_asm_gcc_options*
+
+  Type: |String|
+  Default: `'-Wall'`
+
+  This variable can be set to pass additional options to gcc.
+
 ===============================================================================
 5. Linter Integration Notes                            *ale-linter-integration*
 

test/handler/test_asm_handler.vader

@@ -0,0 +1,32 @@
+Execute(The asm GCC handler should parse lines from GCC 6.3.1 correctly):
+  runtime ale_linters/asm/gcc.vim
+
+  AssertEqual
+  \ [
+  \    {
+  \      'bufnr': 357,
+  \      'lnum': 38,
+  \      'vcol': 0,
+  \      'col': 0,
+  \      'text': "too many memory references for `mov'",
+  \      'type': 'E',
+  \      'nr': -1,
+  \    },
+  \    {
+  \      'bufnr': 357,
+  \      'lnum': 42,
+  \      'vcol': 0,
+  \      'col': 0,
+  \      'text': "incorrect register `%ax' used with `l' suffix",
+  \      'type': 'E',
+  \      'nr': -1,
+  \    },
+  \ ],
+  \ ale_linters#asm#gcc#Handle(357, [
+  \   "{standard input}: Assembler messages:",
+  \   "{standard_input}:38: Error: too many memory references for `mov'",
+  \   "{standard input}:42: Error: incorrect register `%ax' used with `l' suffix",
+  \ ])
+
+After:
+  call ale#linter#Reset()