implement ls

Author: PratiAmalden

implement-shell-tools/ls/ls.mjs

@@ -0,0 +1,29 @@
+import {program} from "commander";
+import {promises as fs} from "node:fs";
+
+program
+  .name("ls")
+  .description("List all the files in a directory")
+  .option("-a, --all", "Include hidden files")
+  .option("-1", "One entry per line")
+  .argument("[dir]", "directory to list", ".");
+
+program.parse();
+
+const options = program.opts();
+const dir = program.args[0] || ".";
+
+const entries = await fs.readdir(dir, { withFileTypes: true });
+
+const visibleNames = [];
+
+for(const entry of entries){
+    if(!options.all && entry.name.startsWith(".")) continue;    
+    visibleNames.push(entry.name);
+}
+
+if(options["1"]){
+    console.log(visibleNames.join("\n"));
+} else{
+    console.log(visibleNames.join("       "));
+}