London | 26-SDC-March | Zobeir Rigi | Sprint 4 | Implement shell tools python

implement-shell-tools/cat/cat.py

@@ -0,0 +1,39 @@
+import sys
+
+args = sys.argv[1:]
+
+option = "none"
+paths = []
+
+# parse args
+for arg in args:
+    if arg == "-n":
+        option = "n"
+    elif arg == "-b":
+        option = "b"
+    else:
+        paths.append(arg)
+
+for path in paths:
+    with open(path, "r") as file:
+        lines = file.readlines()
+
+        line_number = 1
+
+        for line in lines:
+
+            line = line.rstrip("\n")
+
+            if option == "n":
+                print(f"{line_number} {line}")
+                line_number += 1
+
+            elif option == "b":
+                if line != "":
+                    print(f"{line_number} {line}")
+                    line_number += 1
+                else:
+                    print("")
+
+            else:
+                print(line)

implement-shell-tools/ls/ls.py

@@ -0,0 +1,19 @@
+import argparse
+import os
+
+parser = argparse.ArgumentParser()
+parser.add_argument("-a", "--all", action="store_true")
+parser.add_argument("-1", dest="one_per_line", action="store_true")
+parser.add_argument("path", nargs="?", default=".")
+
+args = parser.parse_args()
+
+files = sorted(os.listdir(args.path))
+
+files = [f for f in files if args.all or not f.startswith(".")]
+
+if args.one_per_line:
+    for f in files:
+        print(f)
+else:
+    print(" ".join(files))

implement-shell-tools/wc/wc.py

@@ -0,0 +1,33 @@
+import sys
+
+args = sys.argv[1:]
+
+option = "all"
+paths = []
+
+for arg in args:
+    if arg == "-l":
+        option = "l"
+    elif arg == "-w":
+        option = "w"
+    elif arg == "-c":
+        option = "c"
+    else:
+        paths.append(arg)
+
+for path in paths:
+    with open(path, "r") as file:
+        content = file.read()
+
+    lines = len(content.split("\n"))
+    words = len(content.split(" "))
+    chars = len(content)
+
+    if option == "l":
+        print(lines, path)
+    elif option == "w":
+        print(words, path)
+    elif option == "c":
+        print(chars, path)
+    else:
+        print(lines, words, chars, path)