London | 26-March-SDC | Ammad Ur Rehman | Sprint 4 | Implement shell tools (cat, ls, wc) in Python

implement-shell-tools/.gitignore

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+# Created by https://www.toptal.com/developers/gitignore/api/python,macos,osx
+# Edit at https://www.toptal.com/developers/gitignore?templates=python,macos,osx
+
+### macOS ###
+# General
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+### macOS Patch ###
+# iCloud generated files
+*.icloud
+
+### OSX ###
+# General
+
+# Icon must end with two \r
+
+# Thumbnails
+
+# Files that might appear in the root of a volume
+
+# Directories potentially created on remote AFP share
+
+### Python ###
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# poetry
+#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
+#poetry.lock
+
+# pdm
+#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
+#pdm.lock
+#   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
+#   in version control.
+#   https://pdm.fming.dev/#use-with-ide
+.pdm.toml
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+# PyCharm
+#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
+#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
+#  and can be added to the global gitignore or merged into this file.  For a more nuclear
+#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
+#.idea/
+
+### Python Patch ###
+# Poetry local configuration file - https://python-poetry.org/docs/configuration/#local-configuration
+poetry.toml
+
+# ruff
+.ruff_cache/
+
+# LSP config files
+pyrightconfig.json
+
+# End of https://www.toptal.com/developers/gitignore/api/python,macos,osx

implement-shell-tools/cat/cat.py

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+import argparse
+import os
+
+parser = argparse.ArgumentParser(prog="cat",
+                                 description="simple cat clone")
+
+parser.add_argument("-n",
+                    "--number",
+                    dest="number_all",
+                    action="store_true",
+                    help="number all output lines")
+
+parser.add_argument("-b",
+                    "--number-nonblank",
+                    dest="number_nonblank",
+                    action="store_true",
+                    help="number non-empty output lines")
+
+parser.add_argument("paths", nargs="+", help="file(s) to process")
+
+args = parser.parse_args()
+
+def process_line(line_number, line):
+    if args.number_nonblank:
+        if line == "\n":
+            print(line, end="")
+            return line_number
+
+        print(f"\t{line_number}  {line}", end="")
+        return line_number + 1
+
+    if args.number_all:
+        print(f"\t{line_number}  {line}", end="")
+        return line_number + 1
+
+    print(line, end="")
+    return line_number
+
+for path in args.paths:
+    if os.path.isdir(path):
+        print(f"cat: {path}: Is a directory")
+        continue
+
+    with open(path, "r") as file:
+        line_number = 1
+
+        for line in file:
+            line_number = process_line(line_number, line)

implement-shell-tools/ls/ls.py

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+import argparse
+import os
+
+parser = argparse.ArgumentParser(prog="ls",
+                                 description="simple ls clone")
+
+parser.add_argument("-1",
+                    dest="one_per_line",
+                    action="store_true",
+                    help="list one file per line")
+
+parser.add_argument("-a",
+                    dest="show_hidden_files",
+                    action="store_true",
+                    help="show hidden files")
+
+parser.add_argument("filepath",
+                    nargs="?",
+                    default=".")
+
+args = parser.parse_args()
+
+entries = os.listdir(args.filepath)
+
+if not args.show_hidden_files:
+    entries = [entry for entry in entries if not entry.startswith(".")]
+
+if args.one_per_line:
+    for entry in entries:
+        print(entry)
+else:
+    joined = "\t".join(entries)
+    print(joined)

implement-shell-tools/wc/wc.py

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+import argparse
+import os
+
+parser = argparse.ArgumentParser(prog="wc",
+                                 description="simple wc clone")
+
+parser.add_argument("-w",
+                    "--words",
+                    dest="show_words",
+                    action="store_true",
+                    help="print word count")
+
+parser.add_argument("-l",
+                    "--lines",
+                    dest="show_lines",
+                    action="store_true",
+                    help="print line count")
+
+parser.add_argument("-c",
+                    "--bytes",
+                    dest="show_bytes",
+                    action="store_true",
+                    help="print byte count")
+
+parser.add_argument("paths", nargs="+")
+
+args = parser.parse_args()
+
+if not args.show_lines and not args.show_words and not args.show_bytes:
+    args.show_lines = True
+    args.show_words = True
+    args.show_bytes = True
+
+def format_count(content, path):
+    outputs = []
+
+    word_count = str(len(content.split()))
+    line_count = str(content.count(b"\n"))
+    byte_count = str(len(content))
+
+    if args.show_lines:
+        outputs.append(line_count)
+
+    if args.show_words:
+        outputs.append(word_count)
+
+    if args.show_bytes:
+        outputs.append(byte_count)
+
+    outputs.append(path)
+
+    return "\t".join(outputs)
+
+outputs = []
+
+for path in args.paths:
+    if os.path.isdir(path):
+            print(f"wc: {path}: Is a directory")
+            continue
+
+    with open(path, "rb") as file:
+        content = file.read()
+        output = format_count(content, path)
+        outputs.append("\t" + output)
+
+result = "\n".join(outputs)
+print(result)