Glasgow | 25-SDC-Jul | Mirabelle Morah | Sprint 4 | implementing shell tools in python

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 in python",
+)
+
+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="")

implement-shell-tools/ls/ls.py

@@ -0,0 +1,43 @@
+import argparse
+import os
+import stat
+
+parser = argparse.ArgumentParser(
+    prog="check-for-ls",
+    description="Implement my own version of ls",
+)
+
+parser.add_argument("paths", nargs="*", help="The file paths to process")
+parser.add_argument("-1", "--one", action="store_true", help="This lists one file per line")
+parser.add_argument("-a", action="store_true", help="This shows all files")
+
+args = parser.parse_args()
+
+show_one_line = args.one
+show_all_files = args.a
+
+paths = args.paths
+file_path = paths
+if len(file_path) == 0:
+    file_path = ["."]
+
+for target in file_path:
+    info = os.stat(target)
+
+    if stat.S_ISDIR(info.st_mode):
+        show_files = os.listdir(target)
+
+        if show_all_files:
+            show_files = [".", "..", *show_files]
+        else:
+            show_files = [name for name in show_files if not name.startswith(".")]
+
+        show_files.sort()
+    else:
+        show_files = [target]
+
+    if show_one_line:
+        for file in show_files:
+            print(file)
+    else:
+        print("  ".join(show_files))

implement-shell-tools/wc/wc.py

@@ -0,0 +1,70 @@
+import argparse
+import re
+
+parser = argparse.ArgumentParser(
+    prog="check-for-wc",
+    description="Implement my own version of wc",
+)
+
+parser.add_argument("paths", nargs="+", help="The file paths to process")
+parser.add_argument("-l", action="store_true", help="Counts the total number of lines")
+parser.add_argument("-c", action="store_true", help="Counts the total number of characters")
+parser.add_argument("-w", action="store_true", help="Counts the total number of words")
+
+args = parser.parse_args()
+
+paths = args.paths
+show_lines = args.l
+show_words = args.w
+show_char = args.c
+
+no_flags_given = not show_lines and not show_words and not show_char
+
+columns = []
+
+for path in paths:
+    with open(path, "r", encoding="utf-8") as f:
+        content = f.read()
+
+    line_count = content.count("\n")
+
+    word_count = len([word for word in re.split(r"\s+", content) if word != ""])
+
+    char_count = len(content.encode("utf-8"))
+
+    columns.append({
+        "path": path,
+        "lines": line_count,
+        "words": word_count,
+        "char": char_count,
+    })
+
+if len(columns) > 1:
+    total_lines = 0
+    total_words = 0
+    total_char = 0
+
+    for result in columns:
+        total_lines += result["lines"]
+        total_words += result["words"]
+        total_char += result["char"]
+
+    columns.append({
+        "path": "total",
+        "lines": total_lines,
+        "words": total_words,
+        "char": total_char,
+    })
+
+for result in columns:
+    line = ""
+    if no_flags_given or show_lines:
+        line += str(result["lines"]).rjust(6, " ")
+    if no_flags_given or show_words:
+        line += str(result["words"]).rjust(6, " ")
+    if no_flags_given or show_char:
+        line += str(result["char"]).rjust(6, " ")
+
+    line += " " + result["path"]
+
+    print(line)