Glasgow | 26-SDC-Mar | Mohammed Abdoon | Sprint 4 | Implement Shell Tools In Python

implement-shell-tools/cat/cat.py

@@ -0,0 +1,29 @@
+import argparse
+
+parser = argparse.ArgumentParser()
+parser.add_argument("files", nargs="+")
+parser.add_argument("-n", action="store_true")
+parser.add_argument("-b", action="store_true")
+
+args = parser.parse_args()
+
+line_number = 1
+
+for file in args.files:
+    try:
+        f = open(file, "r")
+
+        for line in f:
+            if args.b and line.strip() != "":
+                print(f"     {line_number}", line, end="")
+                line_number += 1
+            elif args.n and not args.b:
+                print(f"     {line_number}", line, end="")
+                line_number += 1
+            else:
+                print(line, end="")
+
+        f.close()
+
+    except:
+        print("cat:", file, "not found")

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}")

implement-shell-tools/wc/wc.py

@@ -0,0 +1,64 @@
+import argparse
+
+parser = argparse.ArgumentParser()
+parser.add_argument("files", nargs="+")
+parser.add_argument("-l", action="store_true", help="show line count")
+parser.add_argument("-w", action="store_true", help="show word count")
+parser.add_argument("-c", action="store_true", help="show byte count")
+
+args = parser.parse_args()
+
+show_lines = args.l
+show_words = args.w
+show_bytes = args.c
+
+if not show_lines and not show_words and not show_bytes:
+    show_lines = True
+    show_words = True
+    show_bytes = True
+
+total_lines = 0
+total_words = 0
+total_bytes = 0
+
+for file in args.files:
+    try:
+        f = open(file, "rb")
+        content = f.read()
+        f.close()
+
+        line_count = content.count(b"\n")
+        word_count = len(content.split())
+        byte_count = len(content)
+
+        total_lines += line_count
+        total_words += word_count
+        total_bytes += byte_count
+
+        output = []
+
+        if show_lines:
+            output.append(str(line_count))
+        if show_words:
+            output.append(str(word_count))
+        if show_bytes:
+            output.append(str(byte_count))
+
+        output.append(file)
+        print(" ".join(output))
+
+    except OSError:
+        print("wc:", file, "not found")
+
+if len(args.files) > 1:
+    output = []
+
+    if show_lines:
+        output.append(str(total_lines))
+    if show_words:
+        output.append(str(total_words))
+    if show_bytes:
+        output.append(str(total_bytes))
+
+    output.append("total")
+    print(" ".join(output))