implement ls

Author: PratiAmalden

implement-shell-tools/ls/ls.py

@@ -0,0 +1,36 @@
+import argparse
+import os
+import sys
+
+parser = argparse.ArgumentParser(
+    prog="ls",
+    description="List all the files in a directory"
+)
+
+
+parser.add_argument("-a", "--all",action="store_true", help="Include hidden files")
+parser.add_argument("-1", "--one", action="store_true",help="One entry per line")
+parser.add_argument("dir", nargs="?" ,default=".", help="directory to list")
+
+
+args = parser.parse_args()
+
+
+try:
+    # Gets all file names (including hidden ones)
+    files = os.listdir(args.dir)
+except (FileNotFoundError, NotADirectoryError) as err:
+    print(f"ls: can't access: '{args.dir}': {err}")
+    sys.exit(1)
+
+visible_names = [
+    entry for entry in files
+    if args.all or not entry.startswith(".")
+]
+
+visible_names.sort()
+
+if args.one:
+    print("\n".join(visible_names))
+else:
+    print("\t".join(visible_names))