ci: switch from markdownlint to rumdl

Author: chrisgrieser

.editorconfig

@@ -21,6 +21,6 @@ indent_size = 4
 tab_width = 4
 
 [*.md]
+indent_style = space
 indent_size = 4
-tab_width = 4
 trim_trailing_whitespace = false

.github/PULL_REQUEST_TEMPLATE.md

@@ -5,8 +5,8 @@
 <!-- Explain how this PR resolves the problem. -->
 
 ## AI usage disclosure
-<!-- If you used AI beyond simple autocomplete, describe how. 
-AI-assisted code is not discouraged if it has been properly reviewed; 
+<!-- If you used AI beyond simple autocomplete, describe how.
+AI-assisted code is not discouraged if it has been properly reviewed;
 this disclosure is for transparency. -->
 
 ## Checklist

.github/workflows/markdownlint.yml

@@ -0,0 +1,22 @@
+name: Markdown linting via rumdl
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - "**/*.md"
+      - ".github/workflows/rumdl-lint.yml"
+      - ".rumdl.toml"
+  pull_request:
+    paths:
+      - "**/*.md"
+
+jobs:
+  rumdl:
+    name: rumdl
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - uses: rvben/rumdl@v0
+        with:
+          report-type: annotations

.github/workflows/rumdl-lint.yml

@@ -0,0 +1,45 @@
+# DOCS https://github.com/rvben/rumdl/blob/main/docs/global-settings.md
+
+[global]
+line-length = 80
+disable = [
+  "MD032",  # blanks-around-lists: space waster
+]
+# PENDING https://github.com/rvben/rumdl/issues/208
+exclude = [".github/pull_request_template.md"]
+
+# ------------------------------------------------------------------------------
+
+[MD004]  # ul-style
+style = "dash"  # GitHub default & quicker to type
+
+[MD007]  # ul-indent
+indent = 4  # consistent with .editorconfig
+
+[MD013]  # line-length
+code-blocks = false
+reflow = true  # enable auto-formatting
+
+[MD022]  # blanks-around-headings
+lines-below = 0  # rule of proximity
+
+[MD029]  # ol-prefix
+style = "ordered"
+
+[MD033]  # inline-html
+allowed-elements = ["a", "img"]  # badges
+
+[MD049]  # emphasis-style
+style = "asterisk"  # better than underscore, since it's not considered a word-char
+
+[MD050]  # strong-style
+style = "asterisk"  # better than underscore, since it's not considered a word-char
+
+[MD063]  # heading-capitalization
+style = "sentence_case"
+
+# ------------------------------------------------------------------------------
+
+[per-file-ignores]
+# does not need to start with h1
+".github/pull_request_template.md" = ["MD041"]

.markdownlint.yaml

@@ -8,19 +8,19 @@ insignificant punctuation.
 <!-- toc -->
 
 - [Features](#features)
-	* [Subword motion](#subword-motion)
-	* [Skipping insignificant punctuation](#skipping-insignificant-punctuation)
+    - [Subword motion](#subword-motion)
+    - [Skipping insignificant punctuation](#skipping-insignificant-punctuation)
 - [Installation](#installation)
 - [Configuration](#configuration)
-	* [Basic configuration](#basic-configuration)
-	* [Advanced: custom movement patterns](#advanced-custom-movement-patterns)
+    - [Basic configuration](#basic-configuration)
+    - [Advanced: custom movement patterns](#advanced-custom-movement-patterns)
 - [Extras & special cases](#extras--special-cases)
-	* [UTF-8 support](#utf-8-support)
-	* [Subword text object](#subword-text-object)
-	* [Operator-pending mode: the case of `cw`](#operator-pending-mode-the-case-of-cw)
-	* [Consistent operator-pending mode](#consistent-operator-pending-mode)
-	* [Motions in insert mode](#motions-in-insert-mode)
-	* [`precognition.nvim` integration](#precognitionnvim-integration)
+    - [UTF-8 support](#utf-8-support)
+    - [Subword text object](#subword-text-object)
+    - [Operator-pending mode: the case of `cw`](#operator-pending-mode-the-case-of-cw)
+    - [Consistent operator-pending mode](#consistent-operator-pending-mode)
+    - [Motions in insert mode](#motions-in-insert-mode)
+    - [`precognition.nvim` integration](#precognitionnvim-integration)
 - [Credits](#credits)
 
 <!-- tocstop -->
@@ -186,6 +186,7 @@ You can do so directly in `packer.nvim` or via dependency on `nvim_rocks` in
 `lazy.nvim`.
 
 <!-- markdownlint-disable line-length # build line needs to be that long -->
+
 ```lua
 -- packer
 { "chrisgrieser/nvim-spider", rocks = "luautf8" }
@@ -201,6 +202,7 @@ You can do so directly in `packer.nvim` or via dependency on `nvim_rocks` in
 	},
 },
 ```
+
 <!-- markdownlint-enable line-length -->
 
 ### Subword text object