Add prettier pre-commit

Format Markdown and YAML with prettier

.github/linters/.yaml-lint.yml

@@ -1,8 +1,8 @@
 ---
-
 extends: default
 
 rules:
+  comments: disable
   document-start: disable
   line-length: disable
   truthy: false

.github/workflows/lint.yml

@@ -13,15 +13,15 @@ jobs:
       - name: Misspell
         run: git ls-files --empty-directory | xargs ./misspell -error
   pre-commit:
-    name: Run pre-commit  # https://pre-commit.com/
+    name: Run pre-commit # https://pre-commit.com/
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/setup-python@v2  # https://www.python.org/
+      - uses: actions/setup-python@v2 # https://www.python.org/
         with:
-          python-version: '3.x'  # Version range or exact version of a Python version to use, using SemVer's version range syntax
-          architecture: 'x64'  # optional x64 or x86. Defaults to x64 if not specified
-      - name: Install dependencies  # https://pip.pypa.io/en/stable/
+          python-version: '3.x' # Version range or exact version of a Python version to use, using SemVer's version range syntax
+          architecture: 'x64' # optional x64 or x86. Defaults to x64 if not specified
+      - name: Install dependencies # https://pip.pypa.io/en/stable/
         run: |
           python -m pip install --upgrade pip
           pip install pre-commit

.pre-commit-config.yaml

@@ -3,7 +3,7 @@ default_stages: [commit, push]
 default_language_version:
   # force all unspecified Python hooks to run python3
   python: python3
-minimum_pre_commit_version: "1.20.0"
+minimum_pre_commit_version: '1.20.0'
 repos:
   - repo: meta
     hooks:
@@ -35,16 +35,24 @@ repos:
         name: Run codespell
         description: Check spelling with codespell
         entry: codespell --ignore-words=codespell.txt
+  - repo: https://github.com/pre-commit/mirrors-prettier
+    rev: v2.3.1
+    hooks:
+      - id: prettier
+        name: Run prettier
+        description: Format files with prettier
   - repo: https://github.com/igorshubovych/markdownlint-cli
     rev: v0.27.1
     hooks:
       - id: markdownlint
         name: Run markdownlint
+        description: Check all Markdown files with markdownlint
         entry: markdownlint -c .github/linters/.markdown-lint.yml .
   - repo: https://github.com/adrienverge/yamllint
     rev: v1.26.1
     hooks:
       - id: yamllint
-        name: Check YAML files with yamllint
+        name: Run yamllint
+        description: Check YAML files with yamllint
         entry: yamllint --strict -c .github/linters/.yaml-lint.yml .
         types: [yaml]

.prettierrc

@@ -0,0 +1,2 @@
+semi: true
+singleQuote: true

.travis.yml

@@ -1 +1 @@
-script: "./.check.rb"
+script: './.check.rb'

CONTRIBUTING.md

@@ -16,6 +16,6 @@ To run a single hook use `pre-commit run --all-files <hook_id>`
 
 To update use `pre-commit autoupdate`
 
-* [Quick start](https://pre-commit.com/#quick-start)
-* [Usage](https://pre-commit.com/#usage)
-* [pre-commit-autoupdate](https://pre-commit.com/#pre-commit-autoupdate)
+- [Quick start](https://pre-commit.com/#quick-start)
+- [Usage](https://pre-commit.com/#usage)
+- [pre-commit-autoupdate](https://pre-commit.com/#pre-commit-autoupdate)

README.md

@@ -9,7 +9,7 @@ A list of all GEMs for mruby to be managed by mgem
 If you want to add your own mruby GEM to this list please
 create a pull request with your GEM details.
 
-* [CONTRIBUTING.md](CONTRIBUTING.md)
+- [CONTRIBUTING.md](CONTRIBUTING.md)
 
 ## Example
 
@@ -29,8 +29,8 @@ repository: https://github.com/the/address/to/the/gem.git
 
 When creating a new GEM please consider:
 
-* the name should express the functionality of the GEM clearly
-* words should be separated by using dash (-)
-* don't use *under_score* and *CamelCase*
-* prefix should be *mruby-*
-* if it's an executable, prefix should be *mruby-bin-*
+- the name should express the functionality of the GEM clearly
+- words should be separated by using dash (-)
+- don't use _under_score_ and _CamelCase_ <!-- markdownlint-disable MD037 -->
+- prefix should be _mruby-_
+- if it's an executable, prefix should be _mruby-bin-_