Sheffield | 25-SDC-Nov | Hassan Osman | Sprint 4 | Implement shell tools (cat, ls, wc) in Python

implement-shell-tools/cat/cat.py

@@ -0,0 +1,38 @@
+import argparse
+
+parser = argparse.ArgumentParser(
+    prog="display-file-content",
+    description="Output the content of a file to the terminal",
+)
+
+parser.add_argument("-n", help="Number the output lines", action="store_true")
+parser.add_argument("-b", help="Number the non-blank output lines", action="store_true")
+parser.add_argument("paths", help="The file(s)/path(s) to read from", nargs="+")
+
+args = parser.parse_args()
+
+line_number = 1
+
+for path in args.paths:
+    with open(path, "r") as f:
+        for line in f:
+            line = line.rstrip("\n")
+            if args.n:
+                print(f"{line_number:>6} {line}")
+                line_number += 1
+            elif args.b:
+                if line != "":
+                    print(f"{line_number} {line}")
+                    line_number += 1
+                else:
+                    print(f"{line}")
+            else:
+                print(f"{line}")
+
+
+
+
+
+
+
+

implement-shell-tools/ls/ls.py

@@ -0,0 +1,42 @@
+import argparse
+import os
+
+parser = argparse.ArgumentParser(
+    prog="list-files-in-directory",
+    description="List all files and directories in a directory",
+)
+
+parser.add_argument("-1", "--one", dest="one", help="Output one entry per line", action="store_true")
+parser.add_argument("-a", help="List all files & directories, including hidden ones", action="store_true")
+parser.add_argument("paths", nargs="*", default=["."], help="The file(s) or directories to list")
+
+args = parser.parse_args()
+
+for path in args.paths:
+    if os.path.isdir(path):
+        items = os.listdir(path)
+
+        if args.a:
+            items = ['.', '..'] + items
+        else:
+            items = [item for item in items if not item.startswith(".")]
+
+        items.sort()
+
+        for item in items:
+            if args.one:
+                print(item)
+            else:
+                print(item, end="\t")
+        if not args.one:
+            print()
+    else:
+        print(path)
+
+
+
+
+
+
+
+

implement-shell-tools/wc/wc.py

@@ -0,0 +1,76 @@
+
+import argparse
+import os
+
+parser = argparse.ArgumentParser(
+    prog="counter",
+    description="Counts lines, words or characters in a file (or all files) inside a directory",
+)
+
+parser.add_argument("-l", "--line", dest="line", help="The number of lines in each file", action="store_true")
+parser.add_argument("-w", "--word", dest="word", help="The number of words in each file", action="store_true")
+parser.add_argument("-c", "--char", dest="char", help="The number of characters in each file", action="store_true")
+parser.add_argument("paths", help="The file(s)/path(s) to read from", nargs="+")
+
+args = parser.parse_args()
+
+total = {'lines': 0, 'words': 0, 'characters': 0, 'files': 0}
+
+def counter(item):
+    lines = len(item.strip().split("\n"))
+    words = len(item.split())
+    characters = len(item)
+    return {"lines": lines, "words": words, "characters": characters}
+
+
+def process_file(file_path, total):
+    with open(file_path, "r") as f:
+        content = f.read()
+
+    stats = counter(content)
+
+    if args.line:
+        print(f"{stats['lines']} {file_path}")
+    elif args.word:
+        print(f"{stats['words']} {file_path}")
+    elif args.char:
+        print(f"{stats['characters']} {file_path}")
+    else:
+        print(f"{stats['lines']} {stats['words']} {stats['characters']} {file_path}")
+
+    total['lines'] += stats['lines']
+    total['words'] += stats['words']
+    total['characters'] += stats['characters']
+    total['files'] += 1
+
+
+
+for path in args.paths:
+    if os.path.isfile(path):
+        process_file(path, total)
+    elif os.path.isdir(path):
+        for file in os.listdir(path):
+            file_path = os.path.join(path, file)
+            if os.path.isfile(file_path):
+                process_file(file_path, total)
+
+
+
+
+
+
+
+
+if total['files'] > 1:
+    if args.line:
+        print(f"{total['lines']} total")
+    elif args.word:
+        print(f"{total['words']} total")
+    elif args.char:
+        print(f"{total['characters']} total")
+    else:
+        print(f"{total['lines']} {total['words']} {total['characters']} total")
+
+
+
+