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// Licensed to the Software Freedom Conservancy (SFC) under one
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// or more contributor license agreements.  See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership.  The SFC licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License.  You may obtain a copy of the License at
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//
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//   http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied.  See the License for the
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// specific language governing permissions and limitations
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// under the License.
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'use strict';
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const fs = require('fs'),
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    path = require('path');
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const COPYRIGHT_TEXT = [
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  '// Licensed to the Software Freedom Conservancy (SFC) under one',
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  '// or more contributor license agreements.  See the NOTICE file',
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  '// distributed with this work for additional information',
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  '// regarding copyright ownership.  The SFC licenses this file',
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  '// to you under the Apache License, Version 2.0 (the',
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  '// "License"); you may not use this file except in compliance',
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  '// with the License.  You may obtain a copy of the License at',
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  '//',
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  '//   http://www.apache.org/licenses/LICENSE-2.0',
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  '//',
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  '// Unless required by applicable law or agreed to in writing,',
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  '// software distributed under the License is distributed on an',
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  '// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY',
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  '// KIND, either express or implied.  See the License for the',
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  '// specific language governing permissions and limitations',
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  '// under the License.',
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  ''
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].join('\n');
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let BASE_PATH = path.normalize(path.join(__dirname, '../javascript'));
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// Ignore files whose copyright is not SFC or need manual inspection.
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let IGNORE_PATHS = [
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  path.join(BASE_PATH, 'atoms/test/jquery.min.js'),
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];
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updateDir(BASE_PATH);
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function updateDir(dirname) {
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  dirname = path.normalize(dirname);
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  console.log('Scanning directory %s', dirname);
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  fs.readdirSync(dirname).forEach(function(filePath) {
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    if (filePath === 'node_modules') return;
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    filePath = path.normalize(path.join(dirname, filePath));
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    if (IGNORE_PATHS.indexOf(filePath) !== -1) {
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      return;
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    }
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    if (fs.statSync(filePath).isDirectory()) {
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      updateDir(filePath);
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    } else if (/.*\.js$/.test(filePath)) {
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      let index = -1;
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      let lines = fs.readFileSync(filePath, 'utf8').split(/\n/);
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      lines.some(function(line) {
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        if (line.slice(0, 2) === '//') {
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          index += 1;
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          return false;
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        }
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        return true;
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      });
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      let content = COPYRIGHT_TEXT;
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      if (index === -1) {
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        console.log('...file is missing copyright header: %s', filePath);
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        content += '\n' + lines.join('\n');
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      } else {
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        let current = lines.slice(0, index + 1).join('\n') + '\n';
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        if (current === content) {
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          // console.log('...header is up-to-date: %s', filePath);
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          return;
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        } else {
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          console.log('...replacing copyright header: %s', filePath);
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          content += lines.slice(index + 1).join('\n');
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        }
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      }
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      fs.writeFileSync(filePath, content, 'utf8');
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    }
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  })
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}
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