diff --git a/implement-shell-tools/cat/cat.js b/implement-shell-tools/cat/cat.js new file mode 100644 index 0000000..c07a5a7 --- /dev/null +++ b/implement-shell-tools/cat/cat.js @@ -0,0 +1,65 @@ +import * as fs from "fs"; +import { program } from "commander"; +// For reading file line by line +import * as readline from "readline"; +// For handling "*.txt" +import * as glob from "glob"; + +// Set up program +program + .name("cat command") + .description("Implementing 'cat' command (-n, -b flags) functionality") + .argument("", "Path") + .option("-n", "Display line numbers") + .option("-b", "Display line numbers only for non-empty lines") + .parse(process.argv) + +// Function to print file contents with the flags +async function displayFileContents(filePath, displayLineNumbers = false, displayNonEmptyLineNumbers = false) { + try { + // Create a readline interface to read file line by line + const fileStream = fs.createReadStream(filePath, { encoding: 'utf-8' }); + const rl = readline.createInterface({ + input: fileStream, + crlfDelay: Infinity + }); + + // Initialise the line number + let lineNumber = 1; + + // Process each line + for await (const line of rl) { + if (displayNonEmptyLineNumbers) { + if (line.trim()) { + console.log(` ${lineNumber++} ${line}`); + } + } else if (displayLineNumbers) { + console.log(` ${lineNumber++} ${line}`); + } else { + console.log(line); + } + } + } catch (error) { + console.error(`Error reading directory: ${error.message}`); + } +} + +//Get user inputs from command line +const filePaths = program.args; +const displayLineNumbers = program.opts().n; +const displayNonEmptyLineNumbers = program.opts().b; + +const arrayFilePaths = []; + +// Loop through the array with paths to handle "*" +for (const filePath of filePaths) { + // if filePath includes "*", use glob and push files to thr array + if (filePath.includes("*")) { + arrayFilePaths.push(...await glob(filePath)); + } else { + arrayFilePaths.push(filePath); + } +} + +// Handling multiply file processing using Promise.all and map() +await Promise.all(arrayFilePaths.map(filePath => displayFileContents(filePath, displayLineNumbers, displayNonEmptyLineNumbers))); diff --git a/implement-shell-tools/ls/ls.js b/implement-shell-tools/ls/ls.js new file mode 100644 index 0000000..6ecbdc8 --- /dev/null +++ b/implement-shell-tools/ls/ls.js @@ -0,0 +1,76 @@ +// Getting the 'promises' part of the 'fs' module and calling it 'fs' to make it easier to use +import { promises as fs } from "fs"; +// Getting the 'resolve' function from 'path' module to turn relative path (from argument) into full path (absolute path) +import { resolve } from "path"; +// Importing the 'program' object from 'commander' to help build command-line interfaces, handle user inputs. +import { program } from "commander"; +// Importing the 'chalk' module to add colors and styles to text in the console +import chalk from "chalk"; + +// Configure the CLI tool with name, description, arguments, and options +// 'program' is from the Commander package and handles command-line arguments +program + .name("ls command") + .description("Implementing ls command (-1, -a flags) functionality") + .argument("[path]", "Path to list", ".") + .option("-a", "List hidden files, directories") + .option("-1", "List one file, directory per line") + // Read and process command-line arguments, process.argv - an array containing the command-line arguments + .parse(process.argv); + +// Function to list contents of a directory. +async function listDirectoryFiles(directoryPath, showHiddenFiles = false, oneFilePerLine = false) { + try { + // Function call from the fs module. It reads contents of a directory, returns an array of file names (files) + let files = await fs.readdir(directoryPath); + // Array stores current directory, parent directory) + let dotDirectories = []; + // Array stores the names of the files and directories + let displayFiles = []; + // Ensure '.', '..' are on the top of list when we list hidden files + if (showHiddenFiles) { + dotDirectories = [".", ".."]; + } + // Loop through files and add to displayFiles, including hidden files if -a flag is set + for (const file of files) { + if (!file.startsWith(".") || showHiddenFiles) { + displayFiles.push(file); + } + } + // Sort files without leading dots for hidden files + displayFiles.sort((a, b) => { + const fileNameA = a.startsWith(".") ? a.slice(1) : a; + const fileNameB = b.startsWith(".") ? b.slice(1) : b; + // Compares two filenames, considering numbers and ignoring case sensitivity + return fileNameA.localeCompare(fileNameB, "en", { numeric: true, sensitivity: "base" }); + }); + // Merging two arrays into one + let sortedFiles = [...dotDirectories, ...displayFiles]; + + const allFiles = sortedFiles.map(file => { + // Creating the absolute path for the file by combining directoryPath and file name + const absoluteFilePath = resolve(directoryPath, file); + // Check if the file is a directory; if yes, color it blue, otherwise keep it normal. + return fs.stat(absoluteFilePath).then(stats => + stats.isDirectory() ? chalk.blue.bold(file) : file + ); + }); + // Array with style directory in bold and blue + const styledAllFiles = await Promise.all(allFiles); + // Print files either one per line or in a single line separated by spaces + console.log(oneFilePerLine ? styledAllFiles.join("\n") : styledAllFiles.join(" ")); + // If an error occurs while reading the directory, console the error message + } catch (error) { + console.error(`Error reading directory: ${error.message}`); + } +} + +// Get user inputs from command-line options and arguments +const directory = program.args[0] || "."; +const showHiddenFiles = program.opts().a; +const oneFilePerLine = program.opts()["1"]; + +// Resolve the absolute path of the directory +const absoluteDirectoryPath = resolve(directory); +// Call the function to list the files in the directory (with options) +await listDirectoryFiles(absoluteDirectoryPath, showHiddenFiles, oneFilePerLine); \ No newline at end of file diff --git a/implement-shell-tools/package-lock.json b/implement-shell-tools/package-lock.json new file mode 100644 index 0000000..a52151c --- /dev/null +++ b/implement-shell-tools/package-lock.json @@ -0,0 +1,465 @@ +{ + "name": "implement-shell-tools", + "version": "1.0.0", + "lockfileVersion": 3, + "requires": true, + "packages": { + "": { + "name": "implement-shell-tools", + "version": "1.0.0", + "license": "ISC", + "dependencies": { + "chalk": "^5.4.1", + "commander": "^13.1.0", + "glob": "^11.0.1" + } + }, + "node_modules/@isaacs/cliui": { + "version": "8.0.2", + "resolved": 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"^13.1.0", + "glob": "^11.0.1" + } +} diff --git a/implement-shell-tools/wc/wc.js b/implement-shell-tools/wc/wc.js new file mode 100644 index 0000000..1bfc6fa --- /dev/null +++ b/implement-shell-tools/wc/wc.js @@ -0,0 +1,83 @@ +// Import required modules +import { program } from "commander"; +import { promises as fs } from "fs"; +import * as glob from "glob"; + +// Set up program +program + .name("wc command") + .description("Implementing 'wc' command (-c, -w, -l flags) functionality") + .argument("", "Path") + .parse(process.argv); + +// Function to count bytes, words and lines in a file +async function countDisplayNumBytesWordsLines(filePath, numLines = false, numWords = false, numBytes = false) { + try { + // reading file content + let content = await fs.readFile(filePath, "utf-8"); + // Split content into array by lines + let arrayLines = content.split("\n"); + + // Get the number of lines + const countNumLines = arrayLines.filter(line => line.trim() !== "").length; + // Get the number of words using split by any whitespace (spaces, newlines, tabs), filter to remove empty strings + const countNumWords = content.split(/\s+/).filter(word => word !== "").length; + // Get the number of bytes (file size in bytes) + const countNumBytes = (await fs.stat(filePath)).size; + + // Count total of lines, words, bytes + totalLines += countNumLines; + totalWords += countNumWords; + totalBytes += countNumBytes; + + // Formatting output + const output = [ + numLines || showAll ? countNumLines.toString().padStart(3) : null, + numWords || showAll ? countNumWords.toString().padStart(3) : null, + numBytes || showAll ? countNumBytes.toString().padStart(3) : null, + filePath + ].filter(element => element !== null).join(" "); + console.log(output); + } catch (error) { + console.error(`Error reading file: ${filePath} - ${error.message}`); + } +} + +// Get command-line arguments +const filePaths = program.args; +const numLines = program.opts().l; +const numWords = program.opts().w; +const numBytes = program.opts().c; + +// Show all, if no flags +const showAll = !numBytes && !numWords && !numLines; + +const arrayFilePaths = []; + +// Handle "*" +for (const filePath of filePaths) { + if (filePath.includes("*")) { + arrayFilePaths.push(...await glob(filePath)); + } else { + arrayFilePaths.push(filePath); + } +} + +// Initialisation of count total of lines, words, bytes +let totalLines = 0; +let totalWords = 0; +let totalBytes = 0; + +await Promise.all(arrayFilePaths.map(filePath => countDisplayNumBytesWordsLines(filePath, numLines, numWords, numBytes))); + +// Formatting and printing total numbers in console +if (arrayFilePaths.length > 1) { + console.log( + [ + numLines || showAll ? totalLines.toString().padStart(3) : null, + numWords || showAll ? totalWords.toString().padStart(3) : null, + numBytes || showAll ? totalBytes.toString().padStart(3) : null, + "total" + ].filter(element => element !== null).join(" ") + ); +}