import re # libary to search and replace strings in the postscript file
import os

def generate_postscript(previous_module, current_module, script):


    if previous_module == "" or previous_module == "dynamic_glyph":
        print("use empty.ps and write to current_module.ps")
        #input file
        fileInput = open("empty.ps", "rt") # rt = read text mode
        #output file to write the result to
        fileOutput = open(current_module + ".ps", "wt") # wt = write text mode

        # read the input file, search for a patterns, replace it with new patterns (that take the values from the input sensor)
        # uses regular expressions library (re)
        content = fileInput.read()
        content = re.sub(r"% empty file\n\nshowpage\n% print all on a page", (script), content)

        # write the new text to the output file
        fileOutput.write(content)
        #close input and output files
        fileInput.close()
        fileOutput.close()
#        time.sleep(5)

    else:
        print("use previous_module.ps and write to current_module.ps")
        #input file
        fileInput = open(previous_module + ".ps", "rt") # a+ = read text mode and write (append) to end of file
        fileOutput = open(current_module + ".ps",  "wt") # wt = write text mode

        # read the input file, search for a patterns, replace it with new patterns (that take the values from the input sensor)
        # uses regular expressions library (re)
        content = fileInput.read()
        content = re.sub(r"showpage\n% print all on a page", (script), content)

        # write the new text to the output file
        fileOutput.write(content)
        #close input and output files
        fileInput.close()
        fileOutput.close()
#        time.sleep(5)