finished ls.py

Author: M-Abdoon

implement-shell-tools/ls/ls.py

@@ -0,0 +1,34 @@
+import argparse
+import os
+
+
+def get_files(directory):
+    files = os.listdir(directory)
+    files.extend([".", ".."])
+    files.sort(key=str.lower)
+    return files
+
+
+def display_files(files, show_all=False, one_per_line=False):
+    if not show_all:
+        files = [f for f in files if not f.startswith(".")]
+
+    if one_per_line:
+        for file in files:
+            print(file)
+    else:
+        print("  ".join(files))
+
+
+parser = argparse.ArgumentParser()
+parser.add_argument("directory", nargs="?", default=".")
+parser.add_argument("-1", dest="one_per_line", action="store_true", help="list one file per line")
+parser.add_argument("-a", dest="show_all", action="store_true", help="include hidden files")
+
+args = parser.parse_args()
+
+try:
+    files = get_files(args.directory)
+    display_files(files, show_all=args.show_all, one_per_line=args.one_per_line)
+except OSError as e:
+    print(f"ls: {e}")