implementing cat.py

Author: mirabellemorah

implement-shell-tools/cat/cat.py

@@ -0,0 +1,49 @@
+import argparse
+
+parser = argparse.ArgumentParser(
+    prog="check-for-cat",
+    description="Implement my own version of cat",
+)
+
+parser.add_argument("paths", nargs="+", help="The file paths to process")
+parser.add_argument("-n", action="store_true", help="Number lines")
+parser.add_argument("-b", action="store_true", help="Number non-blank lines")
+
+args = parser.parse_args()
+
+paths = args.paths
+show_n = args.n
+show_b = args.b
+
+line_number = 1
+
+for path in paths:
+    with open(path, "r", encoding="utf-8") as f:
+        content = f.read()
+
+    ends_with_newline = content.endswith("\n")
+    lines = content.split("\n")
+    if ends_with_newline:
+        lines.pop()
+
+    new_lines = []
+    for line in lines:
+        if show_b:
+            if line == "":
+                new_lines.append(line)
+            else:
+                numbered = str(line_number).rjust(6, " ") + "\t" + line
+                line_number += 1
+                new_lines.append(numbered)
+        elif show_n:
+            numbered = str(line_number).rjust(6, " ") + "\t" + line
+            line_number += 1
+            new_lines.append(numbered)
+        else:
+            new_lines.append(line)
+    lines = new_lines
+
+    output = "\n".join(lines)
+    if ends_with_newline:
+        output += "\n"
+    print(output, end="")