refactor: extract readFile helper

src/license-plugin.js

@@ -28,13 +28,13 @@ import {mkdirp} from 'mkdirp';
 import _ from 'lodash';
 import moment from 'moment';
 import MagicString from 'magic-string';
-import glob from 'glob';
 import packageNameRegex from 'package-name-regex';
 
 import {Dependency} from './dependency.js';
 import {generateBlockComment} from './generate-block-comment.js';
 import {licensePluginOptions} from './license-plugin-option.js';
 import {licenseValidator} from './license-validator';
+import {readFile} from './read-file';
 import {PLUGIN_NAME} from './license-plugin-name.js';
 import {EOL} from './eol.js';
 
@@ -196,14 +196,9 @@ class LicensePlugin {
 
           // Read license file, if it exists.
           const cwd = this._cwd || process.cwd();
-          const absolutePath = path.join(dir, '[lL][iI][cC][eE][nN][cCsS][eE]*');
-          const relativeToCwd = path.relative(cwd, absolutePath);
-          const licenseFile = this._findGlob(relativeToCwd, cwd).find((file) => (
-            fs.existsSync(file) && fs.lstatSync(file).isFile()
-          ));
-
-          if (licenseFile) {
-            pkg.licenseText = fs.readFileSync(licenseFile, 'utf-8');
+          const licenseText = readFile(dir, cwd, ['license', 'licence']);
+          if (licenseText) {
+            pkg.licenseText = licenseText;
           }
 
           // Add the new dependency to the set of third-party dependencies.
@@ -349,20 +344,6 @@ class LicensePlugin {
     console.warn(`[${this.name}] -- ${msg}`);
   }
 
-  /**
-   * Find given file, matching given pattern.
-   *
-   * @param {string} pattern Pattern to look for.
-   * @param {string} cwd Working directory.
-   * @returns {*} All match.
-   * @private
-   */
-  _findGlob(pattern, cwd) {
-    return glob.sync(pattern, {
-      cwd,
-    });
-  }
-
   /**
    * Read banner from given options and returns it.
    *

src/read-file.js

@@ -0,0 +1,85 @@
+/**
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016-2023 Mickael Jeanroy
+ *
+ * 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.
+ */
+
+import path from 'path';
+import fs from 'fs';
+import _ from 'lodash';
+import glob from 'glob';
+
+/**
+ * Find file and returns its content if file exists.
+ *
+ * @param {string} dir File directory.
+ * @param {string} cwd Working directory.
+ * @param {string|Array<string>} names Potential filenames.
+ * @returns {string|null} File content, or `null` if file does not exist.
+ */
+export function readFile(dir, cwd, names) {
+  const inputs = _.castArray(names);
+
+  for (let i = 0; i < inputs.length; ++i) {
+    const input = generatePattern(inputs[i]);
+    const absolutePath = path.join(dir, input);
+    const relativeToCwd = path.relative(cwd, absolutePath);
+
+    const findings = glob.sync(relativeToCwd, {cwd});
+    for (let j = 0; j < findings.length; ++j) {
+      const file = path.join(cwd, findings[j]);
+      if (isFile(file)) {
+        return fs.readFileSync(file, 'utf-8');
+      }
+    }
+  }
+
+  return null;
+}
+
+/**
+ * Check that given file exists, and is a real file.
+ *
+ * @param {string} file File path.
+ * @returns {boolean} `true` if `file` is a file, `false` otherwise.
+ */
+function isFile(file) {
+  return !!fs.existsSync(file) && !!fs.lstatSync(file).isFile();
+}
+
+/**
+ * Generate glob pattern for given input.
+ *
+ * @param {string} input Given input.
+ * @returns {string} Glob pattern.
+ */
+function generatePattern(input) {
+  let pattern = '';
+
+  for (let i = 0; i < input.length; ++i) {
+    const c = input[i];
+    const up = c.toUpperCase();
+    const low = c.toLowerCase();
+    pattern += up !== low ? `[${low}${up}]` : low;
+  }
+
+  return pattern + '*';
+}

test/read-file.spec.js

@@ -0,0 +1,52 @@
+/**
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016-2023 Mickael Jeanroy
+ *
+ * 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.
+ */
+
+import path from 'path';
+import {readFile} from '../src/read-file.js';
+
+describe('readFile', () => {
+  it('should read file using exact name', () => {
+    const dir = path.join(__dirname, 'fixtures', 'fake-package-2');
+    const cwd = __dirname;
+    const name = 'LICENSE.md';
+    const content = readFile(dir, cwd, name);
+    expect(content).toEqual('LICENSE.md file');
+  });
+
+  it('should read file using non matching case name', () => {
+    const dir = path.join(__dirname, 'fixtures', 'fake-package-2');
+    const cwd = __dirname;
+    const name = 'license.md';
+    const content = readFile(dir, cwd, name);
+    expect(content).toEqual('LICENSE.md file');
+  });
+
+  it('should read file using name without extension', () => {
+    const dir = path.join(__dirname, 'fixtures', 'fake-package-2');
+    const cwd = __dirname;
+    const name = 'license';
+    const content = readFile(dir, cwd, name);
+    expect(content).toEqual('LICENSE.md file');
+  });
+});