Cat - Implement-Shell-tools

Author: delmorallopez

implement-shell-tools/cat/package-lock.json

@@ -0,0 +1,18 @@
+{
+  "type": "module",
+  "name": "cat",
+  "version": "1.0.0",
+  "description": "You should already be familiar with the `cat` command line tool.",
+  "main": "script-01.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+    
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "comander": "^0.0.1-security",
+    "commander": "^14.0.2"
+  }
+}

implement-shell-tools/cat/package.json

@@ -0,0 +1,58 @@
+
+import { program } from "commander";
+import { promises as fs } from "node:fs";
+import process from "node:process";
+
+program
+    .name("read-files-content")
+    .description("Read the content of a file (simulating cat command)")
+    .option("-n, --number","Number of lines")
+    .option("-b","Number of no-blanks lines")
+    .argument('[paths...]', "sample-files/1.txt"); 
+
+
+program.parse();
+
+const argv = program.args;
+console.log(argv);
+
+if (argv.length === 0) {
+    console.error(`Expected file path(s),passed but got ${argv.length}.`);
+    process.exit(1);
+}
+
+
+for (const path of argv){
+    const option = program.opts();
+    const content = await fs.readFile(path, "utf-8");
+    if (option.number){
+        // split content
+        let lines = content.split(/\n/);
+        // removes last line
+        if (lines[lines.length - 1] === ""){
+            lines = lines.slice(0,-1);
+        }
+        lines
+            .map((line,index) => `${(index + 1).toString().padStart(6)}\t${line}`)
+            .forEach(line => console.log(line))
+        } else if (option.b){
+            let lines = content.split("\n");
+            let linesCounter = 0;
+            if (lines[lines.length - 1] === ""){
+                lines = lines.slice(0,-1);
+            }
+            lines
+            .map((line) => {
+                if (line.trim().length > 0) {
+                    linesCounter++;
+                    return `${linesCounter.toString().padStart(6)}\t${line}`
+                }else{
+                    return `${line}`
+                    }}
+                )
+            .forEach(line => console.log(line))
+        }else {
+            const output = content.endsWith("\n") ? content.slice(0,-1) : content;
+            console.log(output);
+    }
+}