Transfer unique view templates in Revit

# -*- coding: utf-8 -*-
"""Import View Templates.

NOTE: No schedule view template will be transferred. Same name view templates will be overriden and views will be updated.
"""
__title__ = 'Import View\nTemplates'
__author__ = "BIMicon"

# Import commom language runtime
import clr

# Import C# List
from System.Collections.Generic import List

# Import 
from pyrevit import revit, DB
from pyrevit import script
from pyrevit import forms

# Store current document into variable
doc = __revit__.ActiveUIDocument.Document
uidoc = __revit__.ActiveUIDocument

# Select opened documents to transfer View Templates
selProject = forms.select_open_docs(title="Select project/s to transfer View Templates", button_name='OK', width=500, multiple=True, filterfunc=None)

# Filter Views
viewsFilter = DB.ElementCategoryFilter(DB.BuiltInCategory.OST_Views)

# Function to retrieve View Templates
def retrieveVT(docList, currentDoc):
	storeDict = {}
	if isinstance(docList, list):
		for pro in docList:
			viewsCollector = DB.FilteredElementCollector(pro).WherePasses(viewsFilter)
			for view in viewsCollector:
				if view.IsTemplate == True:
					storeDict[view.Name + " - " + pro.Title] = view
	elif currentDoc == True:
		viewsCollector = DB.FilteredElementCollector(docList).WherePasses(viewsFilter)
		for view in viewsCollector:
			if view.IsTemplate == True:
				storeDict[view.Name] = view
	else:
		viewsCollector = DB.FilteredElementCollector(docList).WherePasses(viewsFilter)
		for view in viewsCollector:
			if view.IsTemplate == True:
				storeDict[view.Name + " - " + docList.Title] = view
	return storeDict

# Retrieve all view templates from selected docs
viewTemplates = retrieveVT(selProject, False)

# Display select view templates form
vTemplates = forms.SelectFromList.show(viewTemplates.keys(), "View Templates", 600, 300, multiselect=True)

# Collect all View Templates in the current document
docTemplates = retrieveVT(doc, True)

# Remove view templates with same name
vTemplatesNoProj = []
for vT in vTemplates:
	for p in selProject:
		if p.Title in vT:
			vTemplatesNoProj.append(vT.replace(p.Title, ""))

# Remove duplicated view templates from selection
newVTemplates = []
uniqueTemplates = []
for vNoProj, vT in zip(vTemplatesNoProj, vTemplates):
	if vNoProj not in uniqueTemplates:
		uniqueTemplates.append(vNoProj)
		newVTemplates.append(vT)

vTemplates = newVTemplates

# Collect all views from the current document
docViewsCollector = DB.FilteredElementCollector(doc).WherePasses(viewsFilter)

# Check for duplicate View Templates in the current project
dupViewTemplates = []
for vN, vT in docTemplates.items():
	for v in vTemplates:
		if vN in v:
			dupViewTemplates.append(vT)

# Views with view templates
def checkViewT(viewsList):
	viewsWVT = {}
	for v in viewsList:
		if v.ViewTemplateId != DB.ElementId.InvalidElementId:
			viewsWVT.setdefault(v.ViewTemplateId.ToString(), []).append(v)
	return viewsWVT

# Transform object
transIdent = DB.Transform.Identity
copyPasteOpt = DB.CopyPasteOptions()

# Create single transaction and start it
t = DB.Transaction(doc, "Copy View Templates")
t.Start()

# Check for all views that has a view template
vTIds = []
viewsWVT = checkViewT(docViewsCollector)
viewsFail = []
viewsSuccess = []
for vT in vTemplates:
	vTId = List[DB.ElementId]()
	for pro in selProject:
		if pro.Title in vT:
			vTId.Add(viewTemplates[vT].Id)
			# Check if view template is used in current doc
			if vT.replace(" - " + pro.Title, "") not in docTemplates.keys():
				# If not, copy the selected View Template to current project
				DB.ElementTransformUtils.CopyElements(pro, vTId, doc, transIdent, copyPasteOpt)
			# View templates are already in use in the current project
			else:
				vToApplyVT = []
				# Loop through each view template in use in the current document
				for k in viewsWVT.keys():
					views = viewsWVT[k]
					# Helper variable to mark the first time to run the script
					flag = True
					# Assign new view template to each view
					for v in views:
						# Retrieve view template for first time use
						if flag:
							elName = doc.GetElement(v.ViewTemplateId).Name
							if elName in vT:
								doc.Delete(v.ViewTemplateId)
								et = DB.ElementTransformUtils.CopyElements(pro, vTId, doc, transIdent, copyPasteOpt)
							else:
								break
						# Assign view template
						try:
							v.ViewTemplateId = et[0]
							viewsSuccess.append(v.Name)
							flag = False
						except:
							viewsFail.append(v.Name)
							flag = False

# Commit transaction
t.Commit()

# Function to display result to user
def printMessage(resultList, failedList, message, messageWarning):
	if len(resultList) != 0:
		print(message)
		print("\n".join(resultList))
	if len(failedList) != 0:
		print(messageWarning)
		print("\n".join(resultList))

# Print message
printMessage(viewsSuccess, viewsFail, "The following view templates have been changed:",
			"View templates failed to apply to views, make sure the proper view template type is named:")