feat: add ignore option (fix #31) (#37)

- Add functionality to ignore files based on provided
regular expressions
- Support writeIndex and writeIndexCli
- in index.js config must be specified as below

    // @create-index {"ignore":["/foo.js"]}

README.md

@@ -193,3 +193,37 @@ Directories that do not have `./index.js` in themselves will be excluded.
 When run again, `create-index` will update existing `./index.js` if it starts with `// @create-index\n\n`.
 
 If `create-index` is executed against a directory that contains `./index.js`, which does not start with `// @create-index\n\n`, an error will be thrown.
+
+## Ignore files on `--update`
+
+`create-index` can ignore files in a directory if `./index.js` contains special object with defined `ignore` property which takes `an array` of `regular expressions` defined as `strings`, e.g.
+
+```js
+> cat index.js
+// @create-index {"ignore": ["/baz.js$/"]}
+```
+
+```js
+> tree ./
+./
+├── bar.js
+├── baz.js
+├── foo.js
+└── index.js
+
+0 directories, 4 files
+```
+
+Given the above directory contents, after running `create-index` with `--update` flag, `./index.js` will be:
+
+```js
+// @create-index {"ignore": ["/baz.js$/"]}
+
+import { default as bar } from './bar.js';
+import { default as foo } from './foo.js';
+
+export {
+    bar,
+    foo
+};
+```

src/utilities/constants.js

@@ -0,0 +1,2 @@
+// eslint-disable-next-line
+export const CREATE_INDEX_PATTERN = /(?:^|[\n\r]+)\/\/ @create-index\s?({.*})?[\n\r]+/;

src/utilities/createIndexCode.js

@@ -24,8 +24,10 @@ const buildExportBlock = (files) => {
 
 export default (filePaths, options = {}) => {
   let code;
+  let configCode;
 
   code = '';
+  configCode = '';
 
   if (options.banner) {
     const banners = _.isArray(options.banner) ? options.banner : [options.banner];
@@ -37,7 +39,11 @@ export default (filePaths, options = {}) => {
     code += '\n';
   }
 
-  code += '// @create-index\n\n';
+  if (options.config && _.size(options.config) > 0) {
+    configCode += ' ' + JSON.stringify(options.config);
+  }
+
+  code += '// @create-index' + configCode + '\n\n';
 
   if (filePaths.length) {
     const sortedFilePaths = filePaths.sort();

src/utilities/hasIndex.js

@@ -0,0 +1,14 @@
+import fs from 'fs';
+import path from 'path';
+
+export default (directoryPath) => {
+  const indexPath = path.resolve(directoryPath, 'index.js');
+
+  try {
+    fs.statSync(indexPath);
+
+    return true;
+  } catch (error) {
+    return false;
+  }
+};

src/utilities/log.js

@@ -2,8 +2,6 @@ import chalk from 'chalk';
 import moment from 'moment';
 
 export default (...append) => {
-    /* eslint-disable no-console */
+  // eslint-disable-next-line
   console.log(chalk.dim('[' + moment().format('HH:mm:ss') + ']'), ...append);
-
-    /* eslint-enable no-console */
 };

src/utilities/readDirectory.js

@@ -1,20 +1,9 @@
 import fs from 'fs';
 import path from 'path';
 import _ from 'lodash';
+import hasIndex from './hasIndex';
 import validateTargetDirectory from './validateTargetDirectory';
 
-const hasIndex = (directoryPath) => {
-  const indexPath = path.resolve(directoryPath, 'index.js');
-
-  try {
-    fs.statSync(indexPath);
-
-    return true;
-  } catch (error) {
-    return false;
-  }
-};
-
 const hasNoExtension = (fileName) => {
   const matches = fileName.match(/\./g);
 
@@ -54,15 +43,47 @@ const removeDuplicates = (files, preferredExtension) => {
   });
 };
 
-export default (directoryPath, options = {}) => {
-  let children;
+const removeIgnoredFiles = (files, ignorePatterns = []) => {
+  if (ignorePatterns.length === 0) {
+    return files;
+  }
 
+  const patterns = ignorePatterns.map((pattern) => {
+    if (_.startsWith(pattern, '/') && _.endsWith(pattern, '/')) {
+      const patternWithoutSlashes = pattern.slice(1, -1);
+
+      return new RegExp(patternWithoutSlashes);
+    }
+
+    return new RegExp(pattern);
+  });
+
+  return _.filter(files, (fileName) => {
+    let pattern;
+
+    for (pattern of patterns) {
+      if (fileName.match(pattern) !== null) {
+        return false;
+      }
+    }
+
+    return true;
+  });
+};
+
+export default (directoryPath, options = {}) => {
   if (!validateTargetDirectory(directoryPath, {silent: options.silent})) {
     return false;
   }
 
+  const {
+    extensions = ['js'],
+    config = {}
+  } = options;
+
+  let children;
+
   children = fs.readdirSync(directoryPath);
-  const {extensions = ['js']} = options;
 
   children = _.filter(children, (fileName) => {
     const absolutePath = path.resolve(directoryPath, fileName);
@@ -98,6 +119,7 @@ export default (directoryPath, options = {}) => {
   });
 
   children = removeDuplicates(children, extensions[0]);
+  children = removeIgnoredFiles(children, config.ignore);
 
   return children.sort();
 };

src/utilities/readIndexConfig.js

@@ -0,0 +1,32 @@
+import fs from 'fs';
+import path from 'path';
+import hasIndex from './hasIndex';
+import {CREATE_INDEX_PATTERN} from './constants';
+
+export default (directoryPath) => {
+  if (!hasIndex(directoryPath)) {
+    return {};
+  }
+
+  const indexPath = path.resolve(directoryPath, 'index.js');
+  const indexContents = fs.readFileSync(indexPath, 'utf-8');
+  const found = indexContents.match(CREATE_INDEX_PATTERN);
+  const configLine = typeof found[1] === 'string' ? found[1].trim() : '';
+
+  if (configLine.length === 0) {
+    return {};
+  }
+
+  let config;
+
+  try {
+    config = JSON.parse(configLine);
+  } catch (error) {
+    throw new Error(
+      '"' + indexPath + '" contains invalid configuration object.\n' +
+      'Configuration object must be a valid JSON.'
+    );
+  }
+
+  return config;
+};

src/utilities/validateTargetDirectory.js

@@ -1,5 +1,6 @@
 import fs from 'fs';
 import path from 'path';
+import {CREATE_INDEX_PATTERN} from './constants';
 
 export default (targetDirectory, options = {}) => {
   const silent = options.silent;
@@ -33,7 +34,7 @@ export default (targetDirectory, options = {}) => {
 
   const indexFile = fs.readFileSync(indexFilePath, 'utf8');
 
-  if (!indexFile.match(/(?:^|[\n\r]+)\/\/ @create-index[\n\r]+/)) {
+  if (!indexFile.match(CREATE_INDEX_PATTERN)) {
     if (silent) {
       return false;
     } else {

src/utilities/writeIndex.js

@@ -4,6 +4,7 @@ import _ from 'lodash';
 import createIndexCode from './createIndexCode';
 import validateTargetDirectory from './validateTargetDirectory';
 import readDirectory from './readDirectory';
+import readIndexConfig from './readIndexConfig';
 import sortByDepth from './sortByDepth';
 
 export default (directoryPaths, options = {}) => {
@@ -13,8 +14,10 @@ export default (directoryPaths, options = {}) => {
     });
 
   _.forEach(sortedDirectoryPaths, (directoryPath) => {
-    const siblings = readDirectory(directoryPath, options);
-    const indexCode = createIndexCode(siblings);
+    const config = readIndexConfig(directoryPath);
+    const optionsWithConfig = Object.assign({}, options, {config});
+    const siblings = readDirectory(directoryPath, optionsWithConfig);
+    const indexCode = createIndexCode(siblings, {config});
     const indexFilePath = path.resolve(directoryPath, 'index.js');
 
     fs.writeFileSync(indexFilePath, indexCode);

src/utilities/writeIndexCli.js

@@ -5,6 +5,7 @@ import chalk from 'chalk';
 import createIndexCode from './createIndexCode';
 import validateTargetDirectory from './validateTargetDirectory';
 import readDirectory from './readDirectory';
+import readIndexConfig from './readIndexConfig';
 import sortByDepth from './sortByDepth';
 import log from './log';
 import findIndexFiles from './findIndexFiles';
@@ -44,13 +45,17 @@ export default (directoryPaths, options = {}) => {
   _.forEach(sortedDirectoryPaths, (directoryPath) => {
     let existingIndexCode;
 
+    const config = readIndexConfig(directoryPath);
+
     const siblings = readDirectory(directoryPath, {
+      config,
       extensions: options.extensions,
       silent: options.ignoreUnsafe
     });
 
     const indexCode = createIndexCode(siblings, {
-      banner: options.banner
+      banner: options.banner,
+      config
     });
 
     const indexFilePath = path.resolve(directoryPath, 'index.js');

test/createIndexCode.js

@@ -51,6 +51,22 @@ export { default as foo } from './foo.js';
       expect(indexCode).to.equal(codeExample(`
 // @create-index
 
+export { default as bar } from './bar';
+export { default as foo } from './foo';
+      `));
+    });
+  });
+
+  context('with config', () => {
+    it('should append config', () => {
+      const config = {
+        ignore: ['/^zoo/']
+      };
+      const indexCode = createIndexCode(['foo', 'bar'], {config});
+
+      expect(indexCode).to.equal(codeExample(`
+// @create-index {"ignore":["/^zoo/"]}
+
 export { default as bar } from './bar';
 export { default as foo } from './foo';
       `));

test/fixtures/read-index-config/with-config/index.js

@@ -0,0 +1 @@
+// @create-index {"ignore": ["/foo.js$/"]}

test/fixtures/read-index-config/with-invalid-config/index.js

@@ -0,0 +1 @@
+// @create-index {ignore: 'foo'}

test/fixtures/read-index-config/without-config/index.js

@@ -0,0 +1 @@
+// @create-index

test/fixtures/write-index/with-config/index.js

@@ -0,0 +1,4 @@
+// @create-index {"ignore":["/bar.js$/"]}
+
+export { default as foo } from './foo.js';
+

test/readIndexConfig.js

@@ -0,0 +1,56 @@
+import path from 'path';
+import {
+    expect
+} from 'chai';
+import readIndexConfig from '../src/utilities/readIndexConfig';
+
+const fixtures = {
+  noIndex: path.resolve(__dirname, 'fixtures/read-index-config/no-index'),
+  withConfig: path.resolve(__dirname, 'fixtures/read-index-config/with-config'),
+  withInvalidConfig: path.resolve(__dirname, 'fixtures/read-index-config/with-invalid-config'),
+  withoutConfig: path.resolve(__dirname, 'fixtures/read-index-config/without-config')
+};
+
+const expectedValues = {
+  noIndex: {},
+  withConfig: {
+    ignore: ['/foo.js$/']
+  },
+  withoutConfig: {}
+};
+
+describe('readIndexConfig()', () => {
+  context('When valid config is defined', () => {
+    it('reads config object', () => {
+      const config = readIndexConfig(fixtures.withConfig);
+
+      expect(config).to.deep.equal(expectedValues.withConfig);
+    });
+  });
+
+  context('When invalid config is defined', () => {
+    it('should throw an error', () => {
+      const wrappedReadIndexConfig = () => {
+        readIndexConfig(fixtures.withInvalidConfig);
+      };
+
+      expect(wrappedReadIndexConfig).to.throw(/Configuration object must be a valid JSON./);
+    });
+  });
+
+  context('When config is NOT defined', () => {
+    it('returns an empty object', () => {
+      const config = readIndexConfig(fixtures.withoutConfig);
+
+      expect(config).to.deep.equal(expectedValues.withoutConfig);
+    });
+  });
+
+  context('When index file doesn\'t exist', () => {
+    it('returns an empty object', () => {
+      const config = readIndexConfig(fixtures.withoutConfig);
+
+      expect(config).to.deep.equal(expectedValues.noIndex);
+    });
+  });
+});

test/writeIndex.js

@@ -8,28 +8,50 @@ import {
 import writeIndex from '../src/utilities/writeIndex';
 import codeExample from './codeExample';
 
+const readFile = (filePath) => {
+  return fs.readFileSync(filePath, 'utf8');
+};
+
+const removeFile = (filePath) => {
+  fs.unlinkSync(filePath);
+};
+
+const appendToFile = (filePath, content) => {
+  fs.appendFileSync(filePath, content, 'utf-8');
+};
+
 const fixturesPath = path.resolve(__dirname, 'fixtures/write-index');
 
 describe('writeIndex()', () => {
   it('creates index in target directory', () => {
     const indexFilePath = path.resolve(fixturesPath, 'mixed/index.js');
 
-    try {
-      fs.unlinkSync(indexFilePath);
-
-      // eslint-disable-next-line no-empty
-    } catch (error) {
-
-    }
-
+    removeFile(indexFilePath);
     writeIndex([path.resolve(fixturesPath, 'mixed')]);
-
-    const indexCode = fs.readFileSync(indexFilePath, 'utf8');
+    const indexCode = readFile(indexFilePath);
 
     expect(indexCode).to.equal(codeExample(`
 // @create-index
 
 export { default as bar } from './bar';
+export { default as foo } from './foo.js';
+    `));
+  });
+
+  it('creates index with config in target directory', () => {
+    const indexFilePath = path.resolve(fixturesPath, 'with-config/index.js');
+    // eslint-disable-next-line
+    const ignoredExportLine = `export { default as bar } from './bar.js';`;
+
+    appendToFile(indexFilePath, ignoredExportLine);
+    expect(readFile(indexFilePath).includes(ignoredExportLine)).to.equal(true);
+
+    writeIndex([path.resolve(fixturesPath, 'with-config')]);
+    const indexCode = readFile(indexFilePath);
+
+    expect(indexCode).to.equal(codeExample(`
+// @create-index {"ignore":["/bar.js$/"]}
+
 export { default as foo } from './foo.js';
     `));
   });