Glasgow | 25-SDC-Nov | Nataliia Volkova | Sprint 4 | Implement shell tools (cat, ls, wc) in Python

implement-shell-tools/cat/cat.py

@@ -0,0 +1,30 @@
+import argparse
+
+parser = argparse.ArgumentParser(
+    prog="cat-command", description="cat shell command in python "
+)
+
+parser.add_argument("-n", action="store_true", help="Display all lines numbers")
+parser.add_argument("-b", action="store_true", help="Display numbers non-empty lines")
+parser.add_argument("path", nargs="+", help="The file to search")
+
+args = parser.parse_args()
+number = 1
+
+for file_path in args.path:
+    with open(file_path, "r") as f:
+        content = f.readlines()
+
+    if args.n:
+        for line in content:
+            print(f"{number}\t{line.strip()}")
+            number += 1
+    elif args.b:
+        for line in content:
+            if line.strip() != "":
+                print(f"{number}\t{line.strip()}")
+                number += 1
+            else:
+                print("")
+    else:
+        print("".join(content))

implement-shell-tools/ls/ls.py

@@ -0,0 +1,57 @@
+import argparse
+import os
+import stat
+import pwd
+import grp
+import time
+
+parser = argparse.ArgumentParser(
+    prog="ls-command", description="ls shell command on python"
+)
+
+parser.add_argument("-1", action="store_true", dest="one", help="One file per line")
+parser.add_argument(
+    "-l", action="store_true", help="Display long format description files"
+)
+parser.add_argument(
+    "-a", action="store_true", help="Display hidden files along with visible"
+)
+parser.add_argument("path", nargs="*", default=["."], help="The file to search")
+
+
+args = parser.parse_args()
+
+
+def long_format(path, file):
+    info = os.stat(path)
+    permissions = stat.filemode(info.st_mode)
+    size_file = info.st_size
+    owner = pwd.getpwuid(info.st_uid).pw_name
+    group = grp.getgrgid(info.st_gid).gr_name
+    mtime = time.strftime("%b %d %H:%M", time.localtime(info.st_mtime))
+    print(permissions, size_file, owner, group, mtime, file)
+
+
+for path in args.path:
+    if os.path.isfile(path):
+        file = os.path.basename(path)
+        if args.l:
+            long_format(path, file)
+        else:
+            print(file)
+    elif os.path.isdir(path):
+        files = os.listdir(path)
+
+    if not args.a:
+        files = [file for file in files if not file.startswith(".")]
+
+    for file in files:
+        full_file_path = os.path.join(path, file)
+
+        if args.l:
+            long_format(full_file_path, file)
+        else:
+            if args.one:
+                print(file)
+            else:
+                print(file, "\n")

implement-shell-tools/wc/wc.py

@@ -0,0 +1,53 @@
+import argparse
+
+parser = argparse.ArgumentParser(
+    prog="wc-count words, lines, characters", description="wc shell command on python"
+)
+
+parser.add_argument("-l", action="store_true", help="Count lines")
+parser.add_argument("-w", action="store_true", help="Count words")
+parser.add_argument("-c", action="store_true", help="Counts bytes")
+parser.add_argument("path", nargs="+", help="The file to search")
+
+args = parser.parse_args()
+
+def calculate_counts(content):
+
+    count_lines = content.count("\n")
+    count_words = len(content.split())
+    count_bytes = len(content.encode("utf-8"))
+
+    return count_lines, count_words, count_bytes
+
+def format_output(count_lines, count_words, count_bytes, file_path):
+    if not (args.l or args.w or args.c):
+        print(count_lines, count_words, count_bytes, file_path)
+    else:
+        line = ""
+        if args.l:
+            line += f"{count_lines}  "
+        if args.w:
+            line += f"{count_words}  "
+        if args.c:
+            line += f"{count_bytes}  "
+        line += f"{file_path}"
+        print(line)
+
+count_total_lines = 0
+count_total_words = 0
+count_total_bytes = 0
+
+for file_path in args.path:
+    with open(file_path, "r") as file:
+        content = file.read()
+
+    count_lines, count_words, count_bytes = calculate_counts(content)
+
+    count_total_lines += count_lines
+    count_total_words += count_words
+    count_total_bytes += count_bytes
+
+    format_output(count_lines, count_words, count_bytes, file_path)
+
+if len(args.path) > 1:
+    format_output(count_total_lines, count_total_words, count_total_bytes, " total")