London | 26-SDC-Mar | Beko | Sprint 4 | Implement Shell Tools

implement-shell-tools/cat/catFile.py

@@ -0,0 +1,44 @@
+import sys
+import os
+
+def main():
+    argv = sys.argv[1:]
+
+    dash = [arg for arg in argv if arg.startswith('-')]
+    file_paths = [arg for arg in argv if not arg.startswith('-')]
+
+    show_line_numbers = '-n' in dash
+    show_non_blank = '-b' in dash
+
+    line_counter = 1
+
+    for file_path in file_paths:
+        try:
+            with open(file_path, 'r', encoding='utf-8') as fs:
+                content = fs.read()
+        except (FileNotFoundError, IsADirectoryError):
+            print(f"cat: {file_path}: No file or directory exists", file=sys.stderr)
+            sys.exit(1)
+
+        lines = content.split('\n')
+
+        if lines and lines[-1] == '':
+            lines.pop()
+
+        for line in lines:
+            is_blank = line.strip() == ''
+
+            if show_non_blank:
+                if is_blank:
+                    print('')
+                else:
+                    print(f"{str(line_counter).rjust(6)}\t{line}")
+                    line_counter += 1
+            elif show_line_numbers:
+                print(f"{str(line_counter).rjust(6)}\t{line}")
+                line_counter += 1
+            else:
+                print(line)
+
+if __name__ == "__main__":
+    main()

implement-shell-tools/ls/lsFile.py

@@ -0,0 +1,31 @@
+import sys
+import os
+
+def main():
+    argv = sys.argv[1:]
+
+    dash = [arg for arg in argv if arg.startswith('-')]
+    paths = [arg for arg in argv if not arg.startswith('-')]
+
+    show_all = '-a' in dash
+
+    target_dir = paths[0] if paths else '.'
+
+    try:
+        entries = os.listdir(target_dir)
+    except FileNotFoundError:
+        print(f"ls: {target_dir}: No such file or directory", file=sys.stderr)
+        sys.exit(1)
+
+    if show_all:
+        result = ['.', '..'] + entries
+    else:
+        result = [e for e in entries if not e.startswith('.')]
+
+    for entry in result:
+        print(entry)
+
+if __name__ == "__main__":
+    main()
+
+

implement-shell-tools/wc/wcFile.py

@@ -0,0 +1,55 @@
+import sys
+import os
+
+def main():
+    argv = sys.argv[1:]
+
+    dash = [arg for arg in argv if arg.startswith('-')]
+    file_paths = [arg for arg in argv if not arg.startswith('-')]
+
+    for_lines = '-l' in dash
+    for_words = '-w' in dash
+    for_bytes = '-c' in dash
+
+    total_lines = 0
+    total_words = 0
+    total_bytes = 0
+
+    for file_path in file_paths:
+        try:
+            with open(file_path, 'r', encoding='utf-8') as fs:
+                content = fs.read()
+        except (FileNotFoundError, IsADirectoryError):
+            print(f"wc: {file_path}: No file or directory exists", file=sys.stderr)
+            sys.exit(1)
+
+        lines = len(content.split('\n')) - 1
+        words = 0 if content.strip() == '' else len(content.strip().split())
+        bytes_count = len(content.encode('utf-8'))
+
+        total_lines += lines
+        total_words += words
+        total_bytes += bytes_count
+
+        if for_lines:
+            print(f"{str(lines).rjust(8)} {file_path}")
+        elif for_words:
+            print(f"{str(words).rjust(8)} {file_path}")
+        elif for_bytes:
+            print(f"{str(bytes_count).rjust(8)} {file_path}")
+        else:
+            print(f"{str(lines).rjust(8)} {str(words).rjust(8)} {str(bytes_count).rjust(8)} {file_path}")
+
+    if len(file_paths) > 1:
+        if for_lines:
+            print(f"{str(total_lines).rjust(8)} total")
+        elif for_words:
+            print(f"{str(total_words).rjust(8)} total")
+        elif for_bytes:
+            print(f"{str(total_bytes).rjust(8)} total")
+        else:
+            print(f"{str(total_lines).rjust(8)} {str(total_words).rjust(8)} {str(total_bytes).rjust(8)} total")
+
+if __name__ == "__main__":
+    main()
+