qgs_theme_slicer.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
import os.path
from qgis.PyQt.QtCore import QCoreApplication
from qgis.core import QgsProject, QgsApplication
from qgis.utils import iface

# This is a python script intended to be used within QGIS to split a project according to its map theme collection.
# It will produce as many project file as existing themes.
# Configure hereafter and run using:
# _QGIS_APP_PATH_ --nologo --noplugins --noversioncheck --code _PATH_TO_theme_slicer.py_

# Configure
project_file = '/Users/denis/Documents/temp/qfield_search/qfield.qgs'
exit_qgis = True

###  !!! DO NOT EDIT BELOW !!! ###

# Open python console for debugging
iface.actionShowPythonDialog().trigger()
p = QgsProject.instance()

# open original project
p.clear()
p.setFileName(project_file)
p.read()
QCoreApplication.processEvents()

themes = []
for theme in p.mapThemeCollection().mapThemes():
    # make copy of the project
    file_parts = os.path.splitext(project_file)
    new_project = "{path}_{theme}{ext}".format(path=file_parts[0], theme=theme, ext=file_parts[1])
    print("Writing {}".format(new_project))
    p.setFileName(new_project)
    p.write()
    QCoreApplication.processEvents()
    # apply theme
    p.mapThemeCollection().applyTheme(theme, p.layerTreeRoot(), iface.layerTreeView().layerTreeModel())
    QCoreApplication.processEvents()
    # save project
    iface.actionSaveProject().trigger()
    QCoreApplication.processEvents()

# exit
if exit_qgis:
    QCoreApplication.processEvents()
    QgsApplication.exitQgis()