Python script to allow put background into the HTML created using `pandoc`

background.py

import sys  
  
# Read the second command line argument as the file name  
read_file = open(sys.argv[1], 'r')  
  
# Read the third command line argument as the output file name  
write_file = open(sys.argv[2], 'w')  
  
temp = ''  
flag = 0  
temp_two = ''  
temp_three = ''  
flag_two = 0  
for line in read_file:  
    if flag_two is 2:  
        if '<section ' in line:  
            for word in line.split():  
                if not '>' in word:  
                    temp_three = temp_three + word + ' '  
                else:  
                    temp_four = word.replace('>', '')  
                    temp_three = temp_three + temp_four + ' ' + temp_two + '>'  
            write_file.write(temp_three)  
            temp_three = ''  
            temp_two = ''  
            flag = 0  
            flag_two = 0  
        elif '</section>' in line:  
            pass  
    # when we encounter `<section` tag we need to start saving lines into variables  
    elif flag is 1 or '<section ' in line:  
        if '<!-- .slide' in line:  
            for word in line.split():  
                if 'data-background' in word:  
                    temp_two = temp_two + word  
                    flag_two = 2  
        elif '</section>' in line:  
            flag = 0  
            temp = temp + line  
            write_file.write(temp)  
            temp = ''  
        temp = temp + line  
        flag = 1  
  
  
    elif flag is 0:  
        write_file.write(line)

Usage

First, create the HTML using pandoc

$ pandoc -s --mathjax -i -t revealjs input_file.md -o first_output_file.html

Now use the following code as follows:

$ python background.py first_output_file.html final_output_file.html