add support for remark-lint

ale_linters/markdown/remark_lint.vim

@@ -0,0 +1,28 @@
+" Author rhysd https://rhysd.github.io/
+" Description: remark-lint for Markdown files
+
+function! ale_linters#markdown#remark_lint#Handle(buffer, lines) abort
+    " matches: '  1:4  warning  Incorrect list-item indent: add 1 space  list-item-indent  remark-lint'
+    let l:pattern = '^ \+\(\d\+\):\(\d\+\)  \(warning\|error\)  \(.\+\)$'
+    let l:output = []
+
+    for l:match in ale#util#GetMatches(a:lines, l:pattern)
+        call add(l:output, {
+        \   'lnum': l:match[1] + 0,
+        \   'col': l:match[2] + 0,
+        \   'type': l:match[3] is# 'error' ? 'E' : 'W',
+        \   'text': l:match[4],
+        \})
+    endfor
+
+    return l:output
+endfunction
+
+call ale#linter#Define('markdown', {
+\   'name': 'remark-lint',
+\   'executable': 'remark',
+\   'command': 'remark --no-stdout --no-color %s',
+\   'callback': 'ale_linters#markdown#remark_lint#Handle',
+\   'lint_file': 1,
+\   'output_stream': 'stderr',
+\})