add initial files

ale_linters/vala/vala_lint.vim

@@ -0,0 +1,44 @@
+" Author: Atsuya Takagi <asoftonight@gmail.com>
+" Description: A linter for Vala using Vala-Lint.
+
+function! ale_linters#vala#vala_lint#GetCommand(buffer) abort
+    return 'io.elementary.vala-lint'
+endfunction
+
+function! ale_linters#vala#vala_lint#Handle(buffer, lines) abort
+    let l:pattern = '^\s*\(\d\+\)\.\(\d\+\)\s\+\(\w\+\)\s\+\(.\+\)\s\([A-Za-z0-9_\-]\+\)'
+    let l:output = []
+
+    for l:line in a:lines
+        let l:match = matchlist(l:line, l:pattern)
+
+        if len(l:match) == 0
+            continue
+        endif
+
+        let l:line = l:match[1] + 0
+        let l:column = l:match[2] + 0
+        let l:type = 'E'
+        let l:text = substitute(l:match[4], '^\s*\(.\{-}\)\s*$', '\1', '')
+        let l:code = l:match[5]
+
+        call add(l:output, {
+        \   'lnum': l:line,
+        \   'col': l:column,
+        \   'text': l:text,
+        \   'type': l:type,
+        \   'code': l:code,
+        \})
+    endfor
+
+    return l:output
+endfunction
+
+call ale#linter#Define('vala', {
+\   'name': 'vala-lint',
+\   'output_stream': 'both',
+\   'executable': 'io.elementary.vala-lint',
+\   'command': function('ale_linters#vala#vala_lint#GetCommand'),
+\   'callback': 'ale_linters#vala#vala_lint#Handle',
+\   'lint_file': 1,
+\})

test/handler/test_vala_lint_handler.vader

@@ -0,0 +1,37 @@
+Before:
+  runtime ale_linters/vala/vala_lint.vim
+
+After:
+  call ale#linter#Reset()
+
+Execute(The Vala-Lint handler should parse lines correctly):
+  AssertEqual
+  \ [
+  \   {
+  \     'lnum': 18,
+  \     'col': 18,
+  \     'text': 'Expected space before paren',
+  \     'code': 'space-before-paren',
+  \     'type': 'E',
+  \   },
+  \   {
+  \     'lnum': 64,
+  \     'col': 37,
+  \     'text': 'Expected space before paren',
+  \     'code': 'space-before-paren',
+  \     'type': 'E',
+  \   },
+  \   {
+  \     'lnum': 73,
+  \     'col': 37,
+  \     'text': 'Expected space before paren',
+  \     'code': 'space-before-paren',
+  \     'type': 'E',
+  \   },
+  \ ],
+  \ ale_linters#vala#vala_lint#Handle(bufnr(''), [
+  \   'Application.vala',
+  \   '   18.18    error   Expected space before paren                     space-before-paren',
+  \   '   64.37    error   Expected space before paren                     space-before-paren',
+  \   '   73.37    error   Expected space before paren                     space-before-paren',
+  \ ])