cat-implementation

Author: sarawone

.DS_Store

@@ -0,0 +1,43 @@
+import { program } from "commander";
+import { promises as fs } from "node:fs";
+
+
+program
+  .name("cat")
+  .description("Prints file content with optional line numbers")
+  .argument("<file>", "file to read")
+  .option("-n, --number", "number all lines")
+  .option("-b, --number-nonblank", "number non-blank lines only")
+  .parse();
+
+const options = program.opts();
+const filePath = program.args[0];
+
+try {
+  const content = await fs.readFile(filePath, "utf-8");
+  const lines = content.split("\n");
+
+  lines.forEach((line, index) => {
+    const lineNumber = index + 1;
+    if (options.number) {
+    
+      console.log(`${lineNumber.toString().padStart(4)}  ${line}`);
+    } else if (options.numberNonblank) {
+      
+      if (line.trim() === "") {
+        console.log("     " + line);
+      } else {
+        console.log(`${lineNumber.toString().padStart(4)}  ${line}`);
+      }
+    } else {
+
+      console.log(line);
+    }
+  });
+} catch (err) {
+  console.error(`Error reading file "${filePath}":`, err.message);
+  process.exit(1);
+}
+
+   
+

implement-shell-tools/.DS_Store

@@ -0,0 +1,5 @@
+{
+  "dependencies": {
+    "commander": "^14.0.0"
+  }
+}