Add support for ASM files using GCC

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',
+\})