initial commit

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

.gitignore

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+### 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
+
+### Vim ###
+# Swap
+[._]*.s[a-v][a-z]
+!*.svg  # comment out if you don't need vector files
+[._]*.sw[a-p]
+[._]s[a-rt-v][a-z]
+[._]ss[a-gi-z]
+[._]sw[a-p]
+
+# Session
+Session.vim
+Sessionx.vim
+
+# Temporary
+.netrwhist
+*~
+# Auto-generated tag files
+tags
+# Persistent undo
+[._]*.un~

colorhash/__main__.py

@@ -0,0 +1,114 @@
+import hashlib
+import sys
+
+
+# TODO - WASM compile for embedding directly in HTML
+# TODO - command line parsing for hash type, infile, forcing a palette, etc
+# TODO - file streaming for infile so we aren't loading e.g. 4GB into memory unnecessarily
+
+
+def hash2matrix(data: bytes, w: int, h: int) -> list[list[int]]:
+    """
+    Convert a hash to a list of rows of nibbles.
+    """
+    # Split the data into nibbles first, in case the width is an odd number
+    nibbles = []
+    for b in data:
+        top = (b & 0xF0) >> 4
+        bottom = b & 0x0F
+        nibbles += [top, bottom]
+
+    if len(nibbles) != w * h:
+        raise ValueError(
+            f"input data length ({len(nibbles)}) must match matrix dimensions ({w}x{h} = {w * h})"
+        )
+
+    cols = []
+    row = []
+    for b in nibbles:
+        row += [b]
+        if len(row) == w:
+            cols += [row]
+            row = []
+
+    return cols
+
+
+def gensvg(matrix: list[list[int]], square_size: int = 32):
+    h = len(matrix)
+    w = len(matrix[0])
+
+    # Start SVG string
+    svg = f'<svg width="{w * square_size}" height="{h * square_size}" xmlns="http://www.w3.org/2000/svg">\n'
+
+    # Generate grid
+    for r in range(h):
+        for c in range(w):
+            x = c * square_size
+            y = r * square_size
+            color = matrix[r][c]
+            svg += f'  <rect x="{x}" y="{y}" width="{square_size}" height="{square_size}" fill="{color}" />\n'
+
+    # Close SVG string
+    svg += "</svg>"
+    return svg
+
+
+color_table = [
+    # red
+    [f"#{0x110000 * i:06x}" for i in range(0x10)],
+    # green
+    [f"#{0x001100 * i:06x}" for i in range(0x10)],
+    # blue
+    [f"#{0x000011 * i:06x}" for i in range(0x10)],
+    # black
+    [f"#{0x111111 * i:06x}" for i in range(0x10)],
+    # cyan
+    [f"#{0x001111 * i:06x}" for i in range(0x10)],
+    # yellow
+    [f"#{0x111100 * i:06x}" for i in range(0x10)],
+    # magenta
+    [f"#{0x110011 * i:06x}" for i in range(0x10)],
+    # white
+    [f"#{0x111111 * (0xF - i):06x}" for i in range(0x10)],
+]
+
+dimensions_table = {
+    "md5": (8, 4),
+    "sha1": (8, 5),
+    "sha224": (8, 7),
+    "sha256": (8, 8),
+    "sha384": (12, 8),
+    "sha512": (16, 8),
+}
+
+
+hash_algo = "sha512"
+
+infile = sys.stdin.buffer
+
+
+if len(sys.argv) > 1:
+    inpath = sys.argv[1]
+    if inpath != '-':
+        infile = open(inpath, 'rb')
+
+
+hashdata = hashlib.file_digest(infile, hash_algo).digest()
+w, h = dimensions_table[hash_algo]
+matrix = hash2matrix(hashdata, w, h)
+
+# Print matrix
+# pprint.pprint([[hex(c) for c in row] for row in matrix])
+
+palette_no = sum(hashdata) % 8
+# print('using palette:', palette_no)
+palette = color_table[palette_no]
+
+colors = [[palette[v] for v in row] for row in matrix]
+
+# Print colors
+# pprint.pprint([[hex(c) for c in row] for row in colors])
+
+# Print SVG
+print(gensvg(colors))