Initial commit

.editorconfig

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+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 2
+trim_trailing_whitespace = true
+end_of_line = lf
+insert_final_newline = true
+
+[*.md]
+trim_trailing_whitespace = false

.eslintrc.json

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+{
+  "env": {
+    "node": true,
+    "es6": true,
+    "jest": true
+  },
+  "extends": ["eslint:recommended", "prettier"],
+  "plugins": ["prettier"],
+  "globals": {
+    "Atomics": "readonly",
+    "SharedArrayBuffer": "readonly",
+    "run_spec": "readonly"
+  },
+  "parserOptions": {
+    "ecmaVersion": 2018,
+    "sourceType": "module"
+  },
+  "rules": {
+    "prettier/prettier": ["error"],
+    "no-unused-vars": ["error", { "vars": "all", "args": "none", "ignoreRestSiblings": false }]
+  }
+}

.github/dependabot.yml

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+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://help.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: 'npm'
+    directory: '/'
+    schedule:
+      interval: 'weekly'

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    strategy:
+      matrix:
+        node: ['10', '12', '14']
+        ruby: ["2.5", "2.6", "2.7", "3.0"]
+
+    steps:
+      - uses: actions/checkout@v1
+
+      - uses: ruby/setup-ruby@v1
+        with:
+          bundler-cache: true
+          ruby-version: ${{ matrix.ruby }}
+
+      - uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node }}
+
+      - name: Get yarn cache directory path
+        id: yarn-cache-dir-path
+        run: echo "::set-output name=dir::$(yarn cache dir)"
+
+      - uses: actions/cache@v1
+        id: yarn-cache # use this to check for `cache-hit` (`steps.yarn-cache.outputs.cache-hit != 'true'`)
+        with:
+          path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
+          key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-yarn-
+
+      - run: yarn install --frozen-lockfile
+      - run: yarn lint
+      - run: yarn test

.gitignore

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+.DS_Store
+node_modules/
+.vscode/
+coverage/

.prettierrc.json

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+{
+  "singleQuote": true,
+  "printWidth": 120
+}

CHANGELOG.md

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+# Changelog
+
+All notable changes to the prettier-plugin-erb will be documented in this file.
+
+## v.0.1.0 - 7 February 2021
+
+Initial release

LICENSE

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+Copyright 2021 Adam Zapaśnik
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+# Prettier ERB Plugin
+
+## How to install?
+
+```sh
+  yarn add -D prettier @prettier/plugin-ruby prettier-plugin-erb
+```
+
+`@prettier/plugin-ruby` is used for formatting multiline expressions
+
+Available configuration options for plugin-ruby are available [here](https://github.com/prettier/plugin-ruby#configuration)
+
+## How to deal with bugs?
+
+Your code wasn't formatted correctly or there was an error? Add the problematic file to .prettierignore and submit an Issue.

jest.config.js

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+'use strict';
+const ENABLE_CODE_COVERAGE = !!process.env.ENABLE_CODE_COVERAGE;
+
+module.exports = {
+  setupFiles: ['<rootDir>/tests_config/run_spec.js'],
+  snapshotSerializers: ['jest-snapshot-serializer-raw'],
+  testRegex: 'jsfmt\\.spec\\.js$|tests/.*\\.js$',
+  collectCoverage: ENABLE_CODE_COVERAGE,
+  testEnvironment: 'node',
+  transform: {},
+};

lib/expression_type_matcher.js

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+const expressionTypeMatcher = (expression) => {
+  let type;
+
+  if (/<%-?\s*(if|unless)\s[\s\S]*?end\s*-?%>/.test(expression)) {
+    type = 'plain';
+  } else if (/<%-?\s*(if|unless|case)\s/.test(expression) || /<%[^#][\S\s]*(\sdo|\|)\s*-?%>/.test(expression)) {
+    type = 'start';
+  } else if (/<%-?\s*end\s*-?%>/.test(expression)) {
+    type = 'end';
+  } else if (/<%-?\s*else\s*-?%>/.test(expression) || /<%-?\s*(elsif|when)\s/.test(expression)) {
+    type = 'middle';
+  } else {
+    type = 'plain';
+  }
+
+  return { type };
+};
+
+module.exports = expressionTypeMatcher;

lib/formatter.js

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+const { concat, indent, hardline, group } = require('prettier').doc.builders;
+const { format } = require('prettier');
+
+const formatMultilineExpressions = (tokens, options) => {
+  return tokens
+    .map((token) => ({ ...token }))
+    .map((token) => {
+      // TODO: currently doesn't support multiline block opening expressions
+      if (token.type === 'plain' && token.content.match(/\r?\n/)) {
+        const matcher = token.content.match(/<%(=|#|-|#-|#=)?([\S\s]*?)\s*(#|-|#-)?%>/m);
+        const openingTag = matcher[1] || '';
+        const expression = matcher[2];
+        const closingTag = matcher[3] || '';
+        const openingFullTag = `<%${openingTag}`;
+        const closingFullTag = `${closingTag}%>`;
+        const formattedExpression = format(expression, { ...options, parser: 'ruby' })
+          .trim()
+          .split(/\r?\n/)
+          .map((s) => [s, hardline])
+          .reduce((acc, val) => acc.concat(val)) // .flat() isn't supported by node 10
+          .slice(0, -1); // remove last hardline
+
+        token.content = group(
+          concat([openingFullTag, indent(concat([hardline, concat(formattedExpression)])), hardline, closingFullTag])
+        );
+      }
+
+      return token;
+    });
+};
+
+module.exports = formatMultilineExpressions;

lib/index.js

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+const parser = require('./parser');
+const printers = require('./printers');
+
+module.exports = {
+  defaultOptions: {},
+  parsers: {
+    erb: parser,
+  },
+  printers,
+  languages: [
+    {
+      name: 'html-erb',
+      parsers: ['erb'],
+      extensions: ['.html.erb'],
+    },
+  ],
+};

lib/parser.js

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+const { tokenizeHTML } = require('prettier-html-templates');
+const expressionTypeMatcher = require('./expression_type_matcher');
+
+function parse(text, parsers, options) {
+  return tokenizeHTML(text, /<%[\s\S]*?%>/gm, expressionTypeMatcher);
+}
+
+module.exports = {
+  parse,
+  astFormat: 'erb-ast',
+};

lib/printers.js

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+const { encodeExpressions, decodeExpressions } = require('prettier-html-templates');
+const { mapDoc } = require('prettier').doc.utils;
+const formatMultilineExpressions = require('./formatter');
+const prettier = require('prettier');
+
+function embed(path, _print, textToDoc, options) {
+  const tokens = path.stack[0];
+
+  const isTextWithExpressions = tokens.find((token) => token.type !== 'text');
+
+  if (!isTextWithExpressions) {
+    return prettier.format(options.originalText, { ...options, parser: 'html' });
+  }
+
+  const formattedTokens = formatMultilineExpressions(tokens, options);
+  const [text, expressionMap] = encodeExpressions(formattedTokens);
+  const htmlDoc = textToDoc(text, { parser: 'html' });
+
+  const callback = decodeExpressions(expressionMap);
+
+  return mapDoc(htmlDoc, callback);
+}
+
+module.exports = {
+  'erb-ast': {
+    embed: (path, _print, textToDoc, options) => {
+      try {
+        return embed(path, _print, textToDoc, options);
+      } catch (e) {
+        console.error(e);
+        return options.originalText;
+      }
+    },
+  },
+};

package.json

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+{
+  "name": "prettier-plugin-erb",
+  "version": "0.1.0",
+  "license": "MIT",
+  "description": "Prettier plugin for .html.erb files",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/adamzapasnik/prettier-plugin-erb"
+  },
+  "author": {
+    "name": "Adam Zapaśnik",
+    "email": "[email protected]",
+    "url": "https://adamzapasnik.io"
+  },
+  "bugs": {
+    "url": "https://github.com/adamzapasnik/prettier-plugin-erb/issues"
+  },
+  "homepage": "https://github.com/adamzapasnik/prettier-plugin-erb#readme",
+  "keywords": [
+    "plugin",
+    "prettier",
+    "erb",
+    "ruby",
+    "html-erb"
+  ],
+  "main": "./lib/index.js",
+  "scripts": {
+    "test": "jest",
+    "lint": "eslint ."
+  },
+  "husky": {
+    "hooks": {
+      "pre-commit": "lint-staged"
+    }
+  },
+  "lint-staged": {
+    "*.js": [
+      "eslint —-fix"
+    ]
+  },
+  "devDependencies": {
+    "@prettier/plugin-ruby": "^1.5.1",
+    "eslint": "^7.18.0",
+    "eslint-config-prettier": "^7.2.0",
+    "eslint-plugin-import": "^2.22.1",
+    "eslint-plugin-prettier": "^3.3.1",
+    "husky": "^4.3.8",
+    "jest": "^26.6.3",
+    "jest-snapshot-serializer-raw": "^1.1.0",
+    "lint-staged": "^10.5.3",
+    "prettier": "^2.2.1"
+  },
+  "peerDependencies": {
+    "@prettier/plugin-ruby": "^1.0.0",
+    "prettier": "^2.0.0"
+  },
+  "dependencies": {
+    "prettier-html-templates": "^0.1.0"
+  }
+}