Generate a basic parent POM from all subfolders that contain Maven projects.

parent-from-existing.py

#!/usr/bin/env python3

import os
import argparse

parser = argparse.ArgumentParser(description='Generate a Maven parent pom for existing Maven projects in a folder.')
parser.add_argument('root', default='.', nargs='?',
                    help='root (parent) folder')
parser.add_argument('--group', default='localhost', 
                    help='groupId for parent POM')   
parser.add_argument('--artifact', default='parent', 
                    help='artifactId for parent POM')       
parser.add_argument('--version', default='0.0.1-SNAPSHOT', 
                    help='version for parent POM')                                                   
args = parser.parse_args()
   
# quick hack without using an xml lib
pom = "<project>\n" \
        " <modelVersion>4.0.0</modelVersion>\n" \
        f" <groupId>{args.group}</groupId>\n" \
        f" <artifactId>{args.artifact}</artifactId>\n" \
        f" <version>{args.version}</version>\n" \
        " <packaging>pom</packaging>\n" \
        " <modules>\n"
        
# scan the subdirs and consider all those that contain a pom.xml
for entry in sorted(os.scandir(args.root), key=lambda e : e.name):
    if entry.is_dir() and os.path.isfile(os.path.join(entry.path, 'pom.xml')):
        pom += f"  <module>{entry.name}</module>\n"

pom += " </modules>\n" \
        "</project>\n"
               
print(pom)