London | 25-SDC-July | Fatma Arslantas | Sprint 3 | Implement Shell Tools

implement-shell-tools/cat/cat.js

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+import { program } from "commander";
+import { promises as fs } from "node:fs";
+
+program
+  .name("my-cat")
+  .description("Reimplementation of the Unix `cat` command with -n and -b support")
+  .option("-n", "number all lines")
+  .option("-b", "number non-empty lines")
+  .argument("<files...>", "files to read");
+
+program.parse();
+
+const options = program.opts();
+const filePaths = program.args;
+
+let lineNumber = 1;
+
+for (const filePath of filePaths) {
+  const content = await fs.readFile(filePath, "utf-8");
+
+  for (const line of content.split("\n")) {
+    if (options.n) {
+      console.log(`${String(lineNumber).padStart(6, ' ')}  ${line}`);
+      lineNumber++;
+    } else if (options.b) {
+      if (line.trim()) {
+        console.log(`${String(lineNumber).padStart(6, ' ')}  ${line}`);
+        lineNumber++;
+      } else {
+        console.log("");
+      }
+    } else {
+      console.log(line);
+    }
+  }
+}

implement-shell-tools/ls/ls.js

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+import { program } from "commander";
+import { promises as fs } from "node:fs";
+
+program
+  .name("my-ls")
+  .description("Reimplementation of the Unix `ls` command with -1 and -a options")
+  .option("-1", "list one file per line")
+  .option("-a", "include hidden files")
+  .argument("[directory]", "directory to list");
+
+program.parse();
+
+const options = program.opts();
+
+const directory = program.args[0] || "."; // Use current directory as default if no argument is provided
+
+const files = await fs.readdir(directory);
+
+const visibleFiles = options.a ? files : files.filter(file => !file.startsWith("."));
+
+if (options["1"]) {
+  for (const file of visibleFiles) {
+    console.log(file);
+  }
+} else {
+  console.log(visibleFiles.join("       "));
+}
+

implement-shell-tools/package.json

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+{
+  "name": "implement-shell-tools",
+  "version": "1.0.0",
+  "description": "Your task is to re-implement shell tools you have used.",
+  "main": "index.js",
+  "type": "module",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "commander": "^14.0.0"
+  }
+}

implement-shell-tools/wc/wc.js

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+import { program } from "commander";
+import { promises as fs } from "node:fs";
+
+program
+  .name("my-wc")
+  .description("Reimplementation of the Unix `wc` command supporting -l, -w, and -c flags")
+  .option("-l", "show line count")
+  .option("-w", "show word count")
+  .option("-c", "show character count")
+  .argument("<files...>", "files to read");
+
+program.parse();
+
+const options = program.opts();
+const filePaths = program.args;
+
+function formatCounts(lines, words, chars, options) {
+  let result = "";
+
+  if (options.l || options.w || options.c) {
+    if (options.l) result += `${lines}  `;
+    if (options.w) result += `${words}  `;
+    if (options.c) result += `${chars}  `;
+  } else {
+    result += `${lines} ${words} ${chars} `;
+  }
+
+  return result;
+}
+
+let totalLines = 0;
+let totalWords = 0;
+let totalChars = 0;
+
+for (const filePath of filePaths) {
+  const content = await fs.readFile(filePath, "utf-8");
+
+  const lineCount = (content.match(/\n/g) || []).length;
+  const wordCount = content.trim().split(/\s+/).length;
+  const charCount = content.length;
+
+  totalLines += lineCount;
+  totalWords += wordCount;
+  totalChars += charCount;
+
+  const output = formatCounts(lineCount, wordCount, charCount, options);
+
+  console.log(`${output}${filePath}`);
+}
+
+if (filePaths.length > 1) {
+  const totalOutput = formatCounts(totalLines, totalWords, totalChars, options);
+
+  console.log(`${totalOutput}total`);
+}