add support for remark-lint

4 files changed, 57 insertions, 2 deletions

diff --git a/README.md b/README.md
index d0e2024f..549f2aac 100644
--- a/README.md
+++ b/README.md
@@ -107,7 +107,7 @@ formatting.
 | LaTeX | [chktex](http://www.nongnu.org/chktex/), [lacheck](https://www.ctan.org/pkg/lacheck), [proselint](http://proselint.com/) |
 | LLVM | [llc](https://llvm.org/docs/CommandGuide/llc.html) |
 | Lua | [luacheck](https://github.com/mpeterv/luacheck) |
-| Markdown | [mdl](https://github.com/mivok/markdownlint), [proselint](http://proselint.com/), [vale](https://github.com/ValeLint/vale) |
+| Markdown | [mdl](https://github.com/mivok/markdownlint), [proselint](http://proselint.com/), [vale](https://github.com/ValeLint/vale), [remark-lint](https://github.com/wooorm/remark-lint) !! |
 | MATLAB | [mlint](https://www.mathworks.com/help/matlab/ref/mlint.html) |
 | Nim | [nim check](https://nim-lang.org/docs/nimc.html) !! |
 | nix | [nix-instantiate](http://nixos.org/nix/manual/#sec-nix-instantiate) |
diff --git a/ale_linters/markdown/remark_lint.vim b/ale_linters/markdown/remark_lint.vim
new file mode 100644
index 00000000..5b3b3d47
--- /dev/null
+++ b/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',
+\})
diff --git a/doc/ale.txt b/doc/ale.txt
index eaae2842..d393c4d9 100644
--- a/doc/ale.txt
+++ b/doc/ale.txt
@@ -259,7 +259,7 @@ Notes:
 * LaTeX (tex): `chktex`, `lacheck`, `proselint`
 * LLVM: `llc`
 * Lua: `luacheck`
-* Markdown: `mdl`, `proselint`, `vale`
+* Markdown: `mdl`, `proselint`, `vale`, `remark-lint`
 * MATLAB: `mlint`
 * Nim: `nim check`!!
 * nix: `nix-instantiate`
diff --git a/test/handler/test_remark_lint_handler.vader b/test/handler/test_remark_lint_handler.vader
new file mode 100644
index 00000000..f63e0c5b
--- /dev/null
+++ b/test/handler/test_remark_lint_handler.vader
@@ -0,0 +1,27 @@
+Before:
+  runtime ale_linters/markdown/remark_lint.vim
+
+Execute(Warning and error messages should be handled correctly):
+  AssertEqual
+  \ [
+  \   {
+  \      'lnum': 1,
+  \      'col': 4,
+  \      'type': 'W',
+  \      'text': 'Incorrect list-item indent: add 1 space  list-item-indent  remark-lint',
+  \   },
+  \   {
+  \      'lnum': 3,
+  \      'col': 5,
+  \      'type': 'E',
+  \      'text': 'Incorrect list-item indent: remove 1 space  list-item-indent  remark-lint',
+  \   },
+  \ ],
+  \ ale_linters#markdown#remark_lint#Handle(1, [
+  \   'foo.md',
+  \   '  1:4  warning  Incorrect list-item indent: add 1 space  list-item-indent  remark-lint',
+  \   '  3:5  error  Incorrect list-item indent: remove 1 space  list-item-indent  remark-lint',
+  \   '',
+  \   '⚠ 1 warnings',
+  \   '✘ 1 errors',
+  \])