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| const fs = require('fs'); const os = require('os') const NEWLINE = os.EOL; const UTF_8 = 'utf8';
const readFileList = (dirPath) => { return fs.readdirSync(dirPath, (err, fileList) => { if (err) console.log('Error :', err); }); }
const filterFileList = (fileList, targetWord) => { return fileList.filter(fileName => fileName.indexOf(targetWord) > -1); }
const readFileContents = (fileName, targetDir = '') => { return fs.readFileSync(targetDir + fileName, UTF_8, (err, contents) => { if (err) console.log('Error :', err); }); }
const insert = (fileContent, targetLine, lines) => { let contentArr = fileContent.split(NEWLINE); contentArr.splice(targetLine - 1, 0, ...lines); return contentArr.join(NEWLINE); }
const remove = (fileContent, startLine, deleteCount) => { let contentArr = fileContent.split(NEWLINE); contentArr.splice(startLine - 1, deleteCount); return contentArr.join(NEWLINE); }
const update = (fileContent, targetLine, text) => { let contentArr = fileContent.split(NEWLINE); contentArr.splice(targetLine - 1, 1, text); return contentArr.join(NEWLINE); }
const select = (fileContent, targetLine, selectCount) => { let contentArr = fileContent.split(NEWLINE); return contentArr.filter((_, idx) => idx >= targetLine - 1 && idx < targetLine - 1 + selectCount).join(NEWLINE); }
const insertLine = (targetDir, targetWord, targetLine, ...lines) => { return new Promise((resolve, reject) => { const fileList = readFileList(targetDir); const filteredList = filterFileList(fileList, targetWord);
filteredList.forEach(fileName => { const fileContents = readFileContents(fileName, targetDir); const result = insert(fileContents, targetLine, lines); fs.writeFile(targetDir + fileName, result, UTF_8, err => { if (err) console.log('Error :', err); resolve(result); }); }); }); }
const deleteLine = (targetDir, targetWord, targetLine, deleteCount = 1) => { return new Promise((resolve, reject) => { const fileList = readFileList(targetDir); const filteredList = filterFileList(fileList, targetWord);
filteredList.forEach(fileName => { const fileContents = readFileContents(fileName, targetDir); const result = remove(fileContents, targetLine, deleteCount)
fs.writeFile(targetDir + fileName, result, UTF_8, err => { if (err) console.log('Error :', err); resolve(result); }); }); }); }
const updateLine = (targetDir, targetWord, targetLine, text) => { return new Promise((resolve, reject) => { const fileList = readFileList(targetDir); const filteredList = filterFileList(fileList, targetWord);
filteredList.forEach(fileName => { const fileContents = readFileContents(fileName, targetDir); const result = update(fileContents, targetLine, text)
fs.writeFile(targetDir + fileName, result, UTF_8, err => { if (err) console.log('Error :', err); resolve(result); }); }); }); }
const selectLine = (fileName, targetLine, selectCount = 1) => { const fileContents = readFileContents(fileName); const result = select(fileContents, targetLine, selectCount); return result; }
module.exports = { insertLine, deleteLine, updateLine, selectLine, NEWLINE };
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