colorconverter.py

'''Use with Python3'''
import re
import struct
import textwrap

thefile = open('style.css', encoding="utf-8")
lines = thefile.readlines()

def colorchanger(hexnumber):
    '''Substitute hex colors according to Andrejs formula. Return RGB-strings for CSS'''
    if len(hexnumber) == 3:
        #print("three")
        sixdigit = colorre[0] + colorre[0]
        #print(sixdigit)
        hexadec = struct.unpack('BBB',bytes.fromhex(sixdigit))
        #print(hexadec[0], hexadec[1], hexadec[2])
        sumhex = hexadec[0] + hexadec[1] + hexadec[2]
        yy = round(256 - (sumhex / 3))
        #print(yy)
        result = str(yy) * 3
        #print("Result: " + result)
        if len(result) == 3:
            tripletlist = textwrap.wrap(result, 1)
        elif len(result) == 6:
            tripletlist = textwrap.wrap(result, 2)
        elif len(result) == 9:
            tripletlist = textwrap.wrap(result, 3)
        #print(tripletlist)
        rgb = "rgb(" + tripletlist[0] + ", " +  tripletlist[1]  + ", " + tripletlist[2] + ")"
    if len(hexnumber) == 6:
        #print("six")
        #print("original" + hexnumber)
        hexadec = struct.unpack('BBB',bytes.fromhex(hexnumber))
        #print(hexadec[0], hexadec[1], hexadec[2])
        sumhex = hexadec[0] + hexadec[1] + hexadec[2]
        yy = round(256 - (sumhex / 3))
        #print("yy" + str(yy))
        result = str(yy) * 3
        if len(result) == 3:
            tripletlist = textwrap.wrap(result, 1)
        elif len(result) == 6:
            tripletlist = textwrap.wrap(result, 2)
        elif len(result) == 9:
            tripletlist = textwrap.wrap(result, 3)
        rgb = "rgb(" + tripletlist[0] + ", " +  tripletlist[1]  + ", " + tripletlist[2] + ")"
    return(rgb)

    
# Substitute old colors with new ones then write a new file
newfile = open('newstyle.css', "w")   

for l in lines:
    colorre = re.findall(r'color\:\s\#(.*)(?=\;)', l)
    if not colorre:
        print(l)
        newfile.write(l)
    elif colorre:
        newstring = l.replace(colorre[0], colorchanger(colorre[0]))
        newstringminushash = newstring.replace("#", "")
        print(newstringminushash)
        newfile.write(newstringminushash)

newfile.close()
print("Wrote new file newfile.css. Have a nice day!")