Generate a file's fingerprint from its content.

file_fingerprint.py

#!/usr/bin/env python2.7

from os import rename
from hashlib import sha1


INPUT_PATH = 'data'
INPUT_FILES = ['all.min.css', 'all.css']
OUTPUT_PATH = 'output'

def get_sha1(data):
    """
    Returns a 40 hexadecimal-character hash string of the given data.
    """
    return sha1(data).hexdigest()


def split(filename):
    """
    Split the given filename into its basename and extension.
    The separate components will be returned as in list with the
    basename at index 0 and the extension at index 1.
    If the filename belongs to a file that has been minified the "min"
    extension will be included in the extension part.

    filename:
        The filename to split into basename and extension.
    """
    components = filename.split('.')
    components_count = len(components)
    if components_count == 1:   # filename
        return [filename, '']   # => ['filename', '']
    elif components_count == 2: # filename.ext
        return components       # => ['filename', 'ext']

    elif components[-2] == "min": # filename.min.ext or filename.whole.lota.dots.min.ext
        return ['.'.join(components[:-2]), '.'.join(components[-2:])] # => ['filename.whole.lota.dots', 'min.ext']
    else: # filename.whole.lota.dots.ext
        return ['.'.join(components[:-1]), '.'.join(components[-1:])] # => ['filename.whole.lota.dots', 'ext']


def main():
    for input_file in INPUT_FILES:
        data = None
        phile = '{}/{}'.format(INPUT_PATH, input_file)
        with open(phile) as fin:
            data = fin.read()
        sha = get_sha1(data)
        input_file_components = split(input_file)
        rename(phile, '{}/{}-{}.{}'.format(OUTPUT_PATH, input_file_components[0], sha, input_file_components[1]))


if __name__ == "__main__":
    main()