Birmingham | 26-SDC-Mar | Chioma Okeke | Sprint 4 | Implement Shell Tools Python

.gitignore

@@ -1 +1,3 @@
 node_modules
+demo*
+.*

implement-shell-tools/cat/cat.py

@@ -0,0 +1,38 @@
+#!/usr/bin/env python3
+
+import argparse
+import sys
+
+parser = argparse.ArgumentParser(
+    prog='cat',
+    description='CLI tool to concatenate and print files', 
+)
+
+parser.add_argument('-n', '--number', action='store_true', help='Number all outputs, starting at 1')
+parser.add_argument('-b', '--nonBlank', action='store_true', help='Number only non-blank lines, starting at 1')
+parser.add_argument('files', nargs='*', help='Files to read')
+
+args = parser.parse_args()
+# print(args.number, args.nonBlank, args.files)
+# print(sys.argv[0], sys.argv[1])
+
+
+for file in args.files:
+    count = 1
+    try:
+        with open(file, 'r') as f:
+            for line in f:
+                if args.nonBlank:
+                    if line.strip():
+                        print(f"{str(count).rjust(6)}\t{line}", end='')
+                        count += 1
+                    else:
+                        print(line, end="")
+                elif args.number:
+                    print(f"{str(count).rjust(6)}\t{line}", end='')
+                    count +=1
+                else:
+                    print(f"{line}", end="")
+
+    except FileNotFoundError:
+        print(f"cat: {file}: No such file or directory.", file=sys.stderr)

implement-shell-tools/ls/ls.py

@@ -0,0 +1,34 @@
+#!/usr/bin/env python3
+
+import argparse
+import os
+import sys
+
+parser = argparse.ArgumentParser(
+    prog='ls',
+    description='CLI tool to list contents of a directory'
+)
+
+parser.add_argument('-1', '--one', action='store_true', help='Force output to be entry per line')
+parser.add_argument('-a','--all', action='store_true', help='Include hidden files')
+parser.add_argument('path', nargs='?', default='.', help='Directories to list')
+
+args = parser.parse_args()
+
+try:
+    entries = os.listdir(args.path)
+    # print(entries)
+    if not args.all:
+        entries = [entry for entry in entries if not entry.startswith('.')]
+    entries.sort(key=str.lower)
+    # print(entries)
+
+    if args.one:
+        for entry in entries:
+            print(entry)
+
+    else:
+        print(f" ".join(entries))
+
+except FileNotFoundError:
+    print(f"ls: {args.path}: No such file or directory.", file=sys.stderr)

implement-shell-tools/wc/wc.py

@@ -0,0 +1,63 @@
+#!/usr/bin/env python3
+
+import argparse
+import sys
+import os
+
+parser = argparse.ArgumentParser(
+    prog='wc',
+    description='Displays number of words, lines, and bytes in a file'
+)
+
+parser.add_argument('-l', '--lines', action='store_true', help='counts number of lines')
+parser.add_argument('-w', '--words', action='store_true', help='counts sequence of characters')
+parser.add_argument('-c', '--bytes', action='store_true', help='counts raw size of a file in bytes')
+parser.add_argument('files', nargs='+', help='Files to read')
+
+args = parser.parse_args()
+
+if not args.files:
+    print(f"wc: missing file to read")
+    sys.exit(1)
+
+total_lines, total_words, total_bytes = 0, 0, 0
+
+for file in args.files:
+    try:
+        with open(file, 'r') as f:
+            content = f.read()
+
+        line_count = content.count('\n')
+        word_count = len(content.split())
+        byte_count = os.path.getsize(file)
+
+        total_lines += line_count
+        total_words += word_count
+        total_bytes += byte_count
+
+        show_all = not (args.lines or args.words or args.bytes)
+
+        output = ""
+        if args.lines or show_all:
+            output += f"{line_count:>7} "
+        if args.words or show_all:
+            output += f"{word_count:>7} "
+        if args.bytes or show_all:
+            output += f"{byte_count:>7} "
+
+        print(f"{output} {file}")
+
+    except FileNotFoundError:
+        print(f"wc: {args.path}: No such file or directory.", file=sys.stderr)
+
+
+if len(args.files) > 1:
+    total = ""
+    if args.lines or show_all:
+        total += f"{total_lines:>7} "
+    if args.words or show_all:
+        total += f"{total_words:>7} "
+    if args.bytes or show_all:
+        total += f"{total_bytes:>7} "
+
+    print(f"{total}total")