Merge java source to single file

prepjava.py

#!/usr/bin/python3

#
# can simply execute `python3 prepjava.py` from the root of your project, if given the following folder structure:
#   /project
#     discussion.txt
#     header.txt
#     output.txt
#     src/*.java
#
# and the script will include header.txt content in a comment preceeding the code
# and will include discussion.txt and output.txt in comments after the code
# and the output file will be project.java in the current folder
#
# alternately you can specify the source folder as first parameter and the
# desired output file name as the second parameter
# if the header.txt, output.txt, discussion.txt files are found they will be included
# 
import os, sys, glob, re
from io import StringIO
 
if len(sys.argv) == 2:
  folder = sys.argv[1]
  outfile = sys.argv[2]
  docfolder = folder

elif len(sys.argv) == 1:

  folder = os.getcwd()  + '/src'
  outfile = os.getcwd() + '/' + os.path.split(os.getcwd())[1] + '.java'
  docfolder = os.getcwd()

else:
  print("prepjava.py folder_with_java output_file")
  sys.exit()
  
out = StringIO()

header = docfolder + '/header.txt'
if os.path.isfile(header):
  lines = (open(header, 'r')).readlines()
  out.writelines('\n/*\n')
  out.writelines(lines)
  out.writelines('\n--------------------------------------------------------------------------------\n')
  out.writelines('\n*/\n')    

imports = []
 
os.chdir(folder)
for file in glob.glob("*.java"): 
  out.writelines('\n/*\n' + 
     '=================================================================================\n' +
     'File: ' + file + '\n*/\n\n')

  lines = (open(file, 'r')).readlines()
  
  for line in lines:
    if re.search('^import [^;]+;$', line):
      imports.append(line)
    else:
      out.writelines(line)


discussion = docfolder + '/discussion.txt'
if os.path.isfile(discussion):
  lines = (open(discussion, 'r')).readlines()
  out.writelines('\n/*\n')
  out.writelines('\n------------------------------------ DISCUSSION ------------------------------------\n')
  out.writelines(lines)
  out.writelines('\n*/\n')    

output = docfolder + '/output.txt'
if os.path.isfile(output):
  lines = (open(output, 'r')).readlines()
  out.writelines('\n/*\n')
  out.writelines('\n------------------------------------ OUTPUT ------------------------------------\n')
  out.writelines(lines)
  out.writelines('\n*/\n')    
    
  
sortedImports = [*set(imports)]

f = open(outfile, "w")
for importLine in sortedImports:
  f.write(importLine)

f.write(out.getvalue())
f.close()

print('File saved at ' + outfile)