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FreeCAD / src /Mod /BIM /nativeifc /ifc_diff.py

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	# SPDX-License-Identifier: LGPL-2.1-or-later

	# ***************************************************************************
	# * *
	# * Copyright (c) 2023 Yorik van Havre <yorik@uncreated.net> *
	# * *
	# * This file is part of FreeCAD. *
	# * *
	# * FreeCAD is free software: you can redistribute it and/or modify it *
	# * under the terms of the GNU Lesser General Public License as *
	# * published by the Free Software Foundation, either version 2.1 of the *
	# * License, or (at your option) any later version. *
	# * *
	# * FreeCAD is distributed in the hope that it will be useful, but *
	# * WITHOUT ANY WARRANTY; without even the implied warranty of *
	# * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
	# * Lesser General Public License for more details. *
	# * *
	# * You should have received a copy of the GNU Lesser General Public *
	# * License along with FreeCAD. If not, see *
	# * <https://www.gnu.org/licenses/>. *
	# * *
	# ***************************************************************************

	"""Diffing tool for NativeIFC project objects"""

	import difflib

	import ifcopenshell

	import FreeCAD
	import FreeCADGui
	import Arch_rc

	from . import ifc_tools

	translate = FreeCAD.Qt.translate


	def get_diff(proj):
	"""Obtains a diff between the current version and the saved version of a project"""

	if not getattr(proj, "IfcFilePath", None):
	old = []
	return 1
	else:
	# cannot use open() here as it gives different encoding
	# than ifcopenshell and diff does not work
	f = ifcopenshell.open(proj.IfcFilePath)
	old = f.wrapped_data.to_string().split("\n")
	if not old:
	return ""
	ifcfile = ifc_tools.get_ifcfile(proj)
	if not ifcfile:
	return ""
	new = ifcfile.wrapped_data.to_string().split("\n")
	# diff = difflib.HtmlDiff().make_file(old,new) # UGLY
	res = [l for l in difflib.unified_diff(old, new, lineterm="")]
	res = [l for l in res if l.startswith("+") or l.startswith("-")]
	res = [l for l in res if not l.startswith("+++") and not l.startswith("---")]
	return "\n".join(res)


	def htmlize(diff):
	"""Returns an HTML version of a diff list"""

	html = "<html><body>\n"
	if diff == 1:
	html += (
	translate(
	"BIM",
	"The IFC file is not saved. Save once"
	" to have an existing IFC file to compare with."
	" Then, run this command again.",
	)
	+ "<br/>\n"
	)
	elif diff:
	diff = diff.split("\n")
	for l in diff:
	if l.startswith("+"):
	html += "<span style='color:green;'>" + l[:100] + "</span><br/>\n"
	elif l.startswith("-"):
	html += "<span style='color:red;'>" + l[:100] + "</span><br/>\n"
	else:
	html += l + "<br/>\n"
	else:
	html += translate("BIM", "No changes to display.") + "<br/>\n"
	html += "</body></html>"
	return html


	def show_diff(diff):
	"""Shows a dialog showing the diff contents"""

	dlg = FreeCADGui.PySideUic.loadUi(":/ui/dialogDiff.ui")
	dlg.textEdit.setStyleSheet("background-color: white; color: black;")
	dlg.textEdit.setHtml(htmlize(diff))
	result = dlg.exec_()