first commit

.editorconfig

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+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.{json,yml}]
+indent_size = 2

.gitignore

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+node_modules/
+npm-debug.log
+yarn-error.log

.npmignore

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+.npmignore
+.gitignore
+.editorconfig
+
+node_modules/
+npm-debug.log
+yarn.lock
+
+*.test.js
+.travis.yml

.travis.yml

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+language: node_js
+cache: yarn
+node_js:
+  - node
+  - "8"
+  - "6"
+  - "4"
+install:
+  - YARN_IGNORE_ENGINES=true yarn

CHANGELOG.md

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+# Change Log
+This project adheres to [Semantic Versioning](http://semver.org/).
+
+## [1.0.0] - 2018-05-03
+- First release

LICENSE

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+The MIT License (MIT)
+
+Copyright 2018 Benoît Rouleau <benoit.rouleau@icloud.com>
+
+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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+# PostCSS Partial Process [![Build Status][ci-img]][ci]
+
+[PostCSS] plugin that runs other plugins on parts of a CSS file delimited by comments.
+
+[PostCSS]: https://github.com/postcss/postcss
+
+## Usage
+
+```js
+postcss([ require('postcss-partial-process')({
+    startComment: 'start postcss-partial-process', // default value
+    endComment: 'end postcss-partial-process', // default value
+    removeComments: true, // false by default
+    plugins = [
+        require('[any postcss plugin you want]'), // this will only affect the CSS between the comments "start postcss-partial-process" and  "end postcss-partial-process"
+    ],
+}) ])
+```
+
+See [PostCSS] docs for examples for your environment.

index.js

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+var postcss = require('postcss');
+
+module.exports = postcss.plugin('postcss-partial-process', ({
+    startComment = 'start postcss-partial-process',
+    endComment = 'end postcss-partial-process',
+    removeComments = false,
+    plugins = []
+} = {}) => {
+    return root => {
+        let processing = false;
+        let partialRoot = null;
+        let promises = [];
+
+        let end = (callback) => {
+            promises.push(
+                postcss(plugins).process(partialRoot, {
+                    from: undefined
+                }).then(callback)
+            );
+        };
+
+        root.each(node => {
+            let starting = false;
+            let ending = false;
+
+            if (node.type === 'comment') {
+                let matches = node.toString().match(/\/\*\s*(.*?)\s*\*\//, '');
+                matches = matches || [];
+                if (matches.length > 1) {
+                    starting = !processing && matches[1] === startComment;
+                    ending = processing && matches[1] === endComment;
+                }
+            }
+
+            if (ending) {
+                end(result => {
+                    node.before(result.root);
+                    if (removeComments) {
+                        node.remove();
+                    }
+                });
+                processing = false;
+            }
+
+            if (processing) {
+                partialRoot.append(node);
+            }
+
+            if (starting) {
+                partialRoot = postcss.root();
+                if (removeComments) {
+                    node.remove();
+                }
+                processing = true;
+            }
+        });
+
+        if (processing) {
+            end(result => {
+                root.append(result.root);
+            });
+        }
+
+        return Promise.all(promises);
+    };
+});

index.test.js

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+var postcss = require('postcss');
+
+var plugin = require('./');
+
+function run(input, output, opts) {
+    return postcss([ plugin(opts) ]).process(input)
+        .then(result => {
+            expect(result.css).toEqual(output);
+            expect(result.warnings().length).toBe(0);
+        });
+}
+
+it('compiles', () => {
+    return run('a{ }', 'a{ }', { });
+});

package.json

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+{
+  "name": "postcss-partial-process",
+  "version": "1.0.0",
+  "description": "PostCSS plugin that runs other plugins on parts of a CSS file delimited by comments",
+  "keywords": [
+    "postcss",
+    "css",
+    "postcss-plugin"
+  ],
+  "author": "Benoît Rouleau <benoit.rouleau@icloud.com>",
+  "license": "MIT",
+  "repository": "benface/postcss-partial-process",
+  "bugs": {
+    "url": "https://github.com/benface/postcss-partial-process/issues"
+  },
+  "homepage": "https://github.com/benface/postcss-partial-process",
+  "dependencies": {
+    "postcss": "^6.0.16"
+  },
+  "devDependencies": {
+    "eslint": "^4.18.2",
+    "eslint-config-postcss": "^2.0.2",
+    "jest": "^22.4.2"
+  },
+  "scripts": {
+    "test": "jest && eslint *.js"
+  },
+  "eslintConfig": {
+    "extends": "eslint-config-postcss/es5",
+    "env": {
+      "jest": true
+    }
+  },
+  "jest": {
+    "testEnvironment": "node"
+  }
+}