cat command

Author: TarasMykytiuk

implement-shell-tools/cat/cat.js

@@ -0,0 +1,40 @@
+import process from "node:process";
+import { promises as fs } from "node:fs";
+
+const argv = process.argv.slice(2, process.argv.length);
+const flags = [];
+const paths = [];
+for (let i = 0; i < argv.length; i++) {
+    if (argv[i][0] == "-") {
+        flags.push(argv[i]);
+    } else {
+        paths.push(argv[i]);
+    }
+}
+
+displayFiles(paths, flags);
+
+async function displayFiles(paths, flags) {
+    let content = '';
+    for (let i = 0; i < paths.length; i++) {
+        content += await fs.readFile(paths[i], "utf-8");
+    }
+
+    const lines = content.split("\n");
+    if (lines[lines.length - 1] == '') {
+        lines.pop();
+    }
+    let lineNumber = 1;
+    for (let i = 0; i < lines.length; i++) {
+        let output = lines[i];
+        if (
+            (flags.includes("-n") && !flags.includes("-b")) ||
+            (flags.includes("-b") && lines[i] != "")
+        ) {
+            output = "     " + (lineNumber).toString() + " " + lines[i];
+            lineNumber++;
+        }
+        console.log(output);
+    }
+}
+

implement-shell-tools/package.json

@@ -0,0 +1,13 @@
+{
+    "name": "implement-shell-tools",
+    "version": "1.0.0",
+    "type": "module",
+    "description": "Your task is to re-implement shell tools you have used.",
+    "main": "index.js",
+    "scripts": {
+        "test": "echo \"Error: no test specified\" && exit 1"
+    },
+    "keywords": [],
+    "author": "",
+    "license": "ISC"
+}