From 93ed0c917adc205720a61094eab7b28fa12a4481 Mon Sep 17 00:00:00 2001
From: Intel A80486DX2-66 <larry.holst@disroot.org>
Date: Sun, 31 Dec 2023 14:25:20 +0300
Subject: [PATCH] add python-programming/git_commit_simulator.py

Extend .gitignore for Python
---
 .gitignore                                 | 162 +++++++++++++++++++++
 python-programming/git_commit_simulator.py | 103 +++++++++++++
 2 files changed, 265 insertions(+)
 create mode 100644 python-programming/git_commit_simulator.py

diff --git a/.gitignore b/.gitignore
index c749891..ab6511a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -51,3 +51,165 @@ modules.order
 Module.symvers
 Mkfile.old
 dkms.conf
+
+# ---> 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/
diff --git a/python-programming/git_commit_simulator.py b/python-programming/git_commit_simulator.py
new file mode 100644
index 0000000..0c21fe9
--- /dev/null
+++ b/python-programming/git_commit_simulator.py
@@ -0,0 +1,103 @@
+#!/usr/bin/python3
+
+from datetime import datetime
+from difflib import unified_diff
+from typing import List, Union
+import random
+import string
+
+FAKE_HASH_ALPHABET = string.digits + string.ascii_lowercase[:6]
+
+def diff_strings(old: str, new: str) -> str:
+    old += "\n" if old else ""
+    new += "\n" if new else ""
+    return "".join(list(unified_diff(old.splitlines(keepends=True),
+                                     new.splitlines(keepends=True)))[2:])[:-1]
+
+def fake_hash(length: int) -> str:
+    return "".join([random.choice(FAKE_HASH_ALPHABET) for i in range(length)])
+
+def styled_date(dt: datetime = None) -> str:
+    if not dt:
+        dt = datetime.now()
+
+    # res = datetime.strftime(dt, "%a %b %d %H:%M:%S %Y")
+    res = dt.ctime()
+
+    offset = dt.astimezone().utcoffset().seconds
+    positive = offset >= 0
+    hours, minutes = offset // 3600, offset % 3600
+    hours, minutes = str(hours).zfill(2), str(minutes).zfill(2)
+    sign = "+" if positive else "-"
+    res += " " + sign + hours + minutes
+    return res
+
+def commit(*, commit_message: Union[List[str], str], branch_name: str = "main",
+           old_content: str = None, new_content: str, file: str, name: str,
+           email: str, mode: str = "100644", dt: datetime = None) -> str:
+    if isinstance(commit_message, str):
+        commit_message = [commit_message + "\n"]
+    commit_message = [" " * 4 + line if line else "" for line in commit_message]
+    if len(commit_message) > 1:
+        commit_message.insert(1, "")
+    commit_message = "\n".join(commit_message)
+
+    new_file = False
+    if old_content is None:
+        new_file = True
+        old_content = ""
+
+    first_file = "/dev/null" if new_file else file
+    second_file = "b/" + file
+
+    first_hash = "0" * 7 if new_file else fake_hash(7)
+
+    index_mode_lines = f"index {first_hash}..{fake_hash(7)}"
+    if new_file:
+        index_mode_lines = f"""\
+new file mode {mode}
+{index_mode_lines}"""
+    else:
+        index_mode_lines += f" {mode}"
+
+    diff = diff_strings(old_content, new_content)
+
+    return f"""\
+commit {fake_hash(40)} (HEAD -> {branch_name})
+Author: {name} <{email}>
+Date:   {styled_date(dt)}
+
+{commit_message}
+
+diff --git {"a/" + file} {second_file}
+{index_mode_lines}
+--- {first_file}
++++ {second_file}
+{diff}"""
+
+example = lambda: commit( \
+    commit_message=["Hello, world!", "Greetings :-)", "Lorem ipsum"], \
+    # old_content="henlo", \
+    new_content="hello", \
+    file="message.txt", \
+    name="Intel A80486DX2-66", \
+    email="larry.holst@disroot.org")
+
+if __name__ == "__main__":
+    from sys import argv
+
+    if "--example" in argv:
+        print("Example output:")
+        print(example())
+        raise SystemExit
+
+    print("This script is not interactive. Please run Python 3 interpreter,\n"
+          "import this file, and use function git_commit_simulator.commit()")
+    print()
+    print("""Function prototype:
+def commit(*, commit_message: Union[List[str], str], branch_name: str = "main",
+           old_content: str = None, new_content: str, file: str, name: str,
+           email: str, mode: str = "100644", dt: datetime = None) -> str:""")
+    print()
+    print("Run with --example to get an example output")
+