London | SDC-Nov-25 | Emiliano Uruena | Sprint 4 | Implement shell Tools Python

implement-shell-tools/cat/cat-python.py

@@ -0,0 +1,49 @@
+import sys
+import argparse
+
+def cat_file(filename, flag):
+    try:
+        with open(filename, 'r') as file:
+            if not flag:
+                for line in file:
+                    print(line, end="")
+
+            elif flag == "-n":
+                for index, line in enumerate(file, start=1):
+                    print(f"{index:6}\t{line}", end="")
+
+            elif flag == "-b":
+                line_number = 1
+                for line in file:
+                    if line.strip() == "":
+                        print(line, end="")
+                    else:
+                        print(f"{line_number:6}\t{line}", end="")
+                        line_number += 1
+
+    except FileNotFoundError:
+        print(f"cat: {filename}: No such file or directory", file=sys.stderr)
+
+def main():
+    parser = argparse.ArgumentParser(description="Simple cat clone")
+
+    parser.add_argument("filenames", nargs="+",
+                        help="Files to display")
+    parser.add_argument("-n", action="store_true",
+                        help="Number all output lines")
+    parser.add_argument("-b", action="store_true",
+                        help="Number non-blank output lines")
+
+    args = parser.parse_args()
+
+    flag = False
+    if args.n:
+        flag = "-n"
+    elif args.b:
+        flag = "-b"
+
+    for filename in args.filenames:
+        cat_file(filename, flag)
+
+if __name__ == "__main__":
+    main()

implement-shell-tools/ls/ls-python.py

@@ -0,0 +1,32 @@
+import argparse
+import os
+
+def main():
+    parser = argparse.ArgumentParser(description=" ls in Python")
+
+    parser.add_argument("path", nargs="?", default=".", help="Directory to list")
+    parser.add_argument("-a", action="store_true", help="Show hidden files")
+    parser.add_argument("-1", dest="one_per_line", action="store_true",
+                        help="List one file per line")
+
+    args = parser.parse_args()
+
+    path = args.path
+    show_hidden = args.a
+    one_per_line = args.one_per_line
+
+    entries = os.listdir(path)
+
+    entries.sort()
+
+    if not show_hidden:
+        entries = [f for f in entries if not f.startswith(".")]
+
+    if one_per_line:
+        for entry in entries:
+            print(entry)
+    else:
+        print(" ".join(entries))
+
+if __name__ == "__main__":
+    main()

implement-shell-tools/wc/wc-python.py

@@ -0,0 +1,65 @@
+import argparse
+
+def count_file(filename):
+
+    with open(filename, 'r') as file:
+        content = file.read()
+
+    lines = len(content.splitlines())
+    words = len(content.split())
+    chars = len(content)
+
+    return (lines, words, chars)
+
+
+def format_output(lines, words, chars, filename, show_l, show_w, show_c):
+    parts = []
+
+    if show_l:
+        parts.append(f"{lines:8}")
+    if show_w:
+        parts.append(f"{words:8}")
+    if show_c:
+        parts.append(f"{chars:8}")
+
+    parts.append(filename)
+
+    return " ".join(parts)
+
+def main():
+    parser = argparse.ArgumentParser(description="wc imlementation in Python")
+
+    parser.add_argument("files", nargs="+", help="Files to process")
+    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 character count")
+
+    args = parser.parse_args()
+
+    l = args.l
+    w = args.w
+    c = args.c
+    files = args.files
+
+    if not (l or w or c):
+        l = w = c = True
+
+    total_lines = total_words = total_chars = 0
+    processed_files = 0
+
+    for filename in files:
+        result = count_file(filename)
+        if result:
+            lines, words, chars = result
+            print(format_output(lines, words, chars, filename, l, w, c))
+
+            total_lines += lines
+            total_words += words
+            total_chars += chars
+            processed_files += 1
+
+    if processed_files > 1:
+        print(format_output(total_lines, total_words, total_chars, "total", l, w, c))
+
+if __name__ == "__main__":
+    main()