T4 is failed to run with Unity.

[shtse8]

I have an issue with Rider T4 and Unity

The issued was first reported in Jetbrains in 2019. but the issue is still here in 2021.

https://youtrack.jetbrains.com/issue/RIDER-37159

Repo Steps:

Make a new Unity Project, open project, update rider in package manager to latest one(just incase older versions cause issues, which was 3.0.5 currently).
Make a random C# script in the Unity Editor and then double click to open with Rider.
Once riders finishes loading add a T4 file via the Rider UI.

Now at this point, I cannot run the file for some reason, the green run button in the left top doesn't seem to work after creating the T4 template.

However after re-starting rider, the run button works. So then I click the preprocess template option.
Boom the new file is now generated into the Unity project root folder, instead of where the T4 file is located.

java.lang.NullPointerException: T4 does not operate without Project and/or VirtualFile
	at com.jetbrains.fortea.language.T4FileType$1.getEditorHighlighter(T4FileType.kt:14)
	at com.intellij.openapi.editor.highlighter.EditorHighlighterFactoryImpl.createEditorHighlighter(EditorHighlighterFactoryImpl.java:37)
	at com.intellij.openapi.editor.highlighter.EditorHighlighterFactoryImpl.createEditorHighlighter(EditorHighlighterFactoryImpl.java:47)
	at com.intellij.diff.util.DiffUtil.createEditorHighlighter(DiffUtil.java:183)
	at com.intellij.diff.util.DiffUtil.setEditorHighlighter(DiffUtil.java:194)
	at com.intellij.diff.util.DiffUtil.configureEditor(DiffUtil.java:262)
	at com.intellij.diff.tools.holders.TextEditorHolder.create(TextEditorHolder.java:97)
	at com.intellij.diff.tools.holders.TextEditorHolder$TextEditorHolderFactory.create(TextEditorHolder.java:107)
	at com.intellij.diff.tools.holders.TextEditorHolder$TextEditorHolderFactory.create(TextEditorHolder.java:101)
	at com.intellij.diff.tools.util.side.OnesideDiffViewer.createEditorHolder(OnesideDiffViewer.java:79)
	at com.intellij.diff.tools.util.side.OnesideTextDiffViewer.createEditorHolder(OnesideTextDiffViewer.java:73)
	at com.intellij.diff.tools.util.side.OnesideTextDiffViewer.createEditorHolder(OnesideTextDiffViewer.java:34)
	at com.intellij.diff.tools.util.side.OnesideDiffViewer.<init>(OnesideDiffViewer.java:51)
	at com.intellij.diff.tools.util.side.OnesideTextDiffViewer.<init>(OnesideTextDiffViewer.java:40)
	at com.intellij.diff.tools.simple.SimpleOnesideDiffViewer.<init>(SimpleOnesideDiffViewer.java:57)
	at com.intellij.diff.tools.simple.SimpleDiffTool.createComponent(SimpleDiffTool.java:30)
	at com.intellij.diff.impl.DiffRequestProcessor.createState(DiffRequestProcessor.java:273)
	at com.intellij.diff.impl.DiffRequestProcessor.lambda$doApplyRequest$4(DiffRequestProcessor.java:348)
	at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:688)
	at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:634)
	at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:64)
	at com.intellij.openapi.progress.impl.CoreProgressManager.executeNonCancelableSection(CoreProgressManager.java:218)
	at com.intellij.diff.impl.DiffRequestProcessor.lambda$doApplyRequest$5(DiffRequestProcessor.java:342)
	at com.intellij.diff.util.DiffUtil.runPreservingFocus(DiffUtil.java:760)
	at com.intellij.diff.impl.DiffRequestProcessor.doApplyRequest(DiffRequestProcessor.java:332)
	at com.intellij.diff.impl.DiffRequestProcessor.lambda$applyRequest$3(DiffRequestProcessor.java:314)
	at com.intellij.openapi.wm.impl.FocusManagerImpl.lambda$doWhenFocusSettlesDown$3(FocusManagerImpl.java:182)
	at com.intellij.util.ui.EdtInvocationManager.invokeLaterIfNeeded(EdtInvocationManager.java:101)
	at com.intellij.ide.IdeEventQueue.ifFocusEventsInTheQueue(IdeEventQueue.java:188)
	at com.intellij.ide.IdeEventQueue.executeWhenAllFocusEventsLeftTheQueue(IdeEventQueue.java:140)
	at com.intellij.openapi.wm.impl.FocusManagerImpl.doWhenFocusSettlesDown(FocusManagerImpl.java:173)
	at com.intellij.openapi.wm.impl.FocusManagerImpl.doWhenFocusSettlesDown(FocusManagerImpl.java:179)
	at com.intellij.openapi.wm.impl.IdeFocusManagerImpl.doWhenFocusSettlesDown(IdeFocusManagerImpl.java:41)
	at com.intellij.diff.impl.DiffRequestProcessor.applyRequest(DiffRequestProcessor.java:322)
	at com.intellij.diff.impl.DiffRequestProcessor.applyRequest(DiffRequestProcessor.java:301)
	at com.intellij.diff.impl.CacheDiffRequestProcessor.lambda$updateRequest$0(CacheDiffRequestProcessor.java:117)
	at com.intellij.openapi.progress.util.BackgroundTaskUtil.finish(BackgroundTaskUtil.java:111)
	at com.intellij.openapi.progress.util.BackgroundTaskUtil.executeAndTryWait(BackgroundTaskUtil.java:99)
	at com.intellij.diff.util.DiffTaskQueue.executeAndTryWait(DiffTaskQueue.java:47)
	at com.intellij.diff.util.DiffTaskQueue.executeAndTryWait(DiffTaskQueue.java:38)
	at com.intellij.diff.impl.CacheDiffRequestProcessor.updateRequest(CacheDiffRequestProcessor.java:112)
	at com.intellij.diff.impl.CacheDiffRequestProcessor.updateRequest(CacheDiffRequestProcessor.java:91)
	at com.intellij.diff.impl.DiffRequestProcessor.updateRequest(DiffRequestProcessor.java:184)
	at com.intellij.diff.impl.DiffRequestProcessor.updateRequest(DiffRequestProcessor.java:179)
	at com.intellij.openapi.vcs.changes.ChangeViewDiffRequestProcessor.setCurrentChange(ChangeViewDiffRequestProcessor.java:178)
	at com.intellij.openapi.vcs.changes.ChangeViewDiffRequestProcessor.refresh(ChangeViewDiffRequestProcessor.java:159)
	at com.intellij.openapi.vcs.changes.EditorTabPreview.openPreview(EditorTabPreview.kt:134)
	at com.intellij.openapi.vcs.changes.EditorTabPreview$openWithSingleClick$1$1.invoke(EditorTabPreview.kt:59)
	at com.intellij.openapi.vcs.changes.EditorTabPreview$openWithSingleClick$1$1.invoke(EditorTabPreview.kt:36)
	at com.intellij.openapi.vcs.changes.EditorTabPreview$installSelectionChangedHandler$1$1.run(EditorTabPreview.kt:100)
	at com.intellij.util.ui.update.DisposableUpdate$1.doRun(DisposableUpdate.java:31)
	at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$2(CoreProgressManager.java:178)
	at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:688)
	at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:634)
	at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:64)
	at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:165)
	at com.intellij.openapi.progress.util.BackgroundTaskUtil.runUnderDisposeAwareIndicator(BackgroundTaskUtil.java:254)
	at com.intellij.util.ui.update.DisposableUpdate.run(DisposableUpdate.java:19)
	at com.intellij.util.ui.update.MergingUpdateQueue.execute(MergingUpdateQueue.java:333)
	at com.intellij.util.ui.update.MergingUpdateQueue.execute(MergingUpdateQueue.java:323)
	at com.intellij.util.ui.update.MergingUpdateQueue.lambda$flush$1(MergingUpdateQueue.java:273)
	at com.intellij.util.ui.EdtInvocationManager.invokeAndWaitIfNeeded(EdtInvocationManager.java:148)
	at com.intellij.util.ui.UIUtil.invokeAndWaitIfNeeded(UIUtil.java:2115)
	at com.intellij.util.ui.update.MergingUpdateQueue.flush(MergingUpdateQueue.java:284)
	at com.intellij.util.ui.update.MergingUpdateQueue.run(MergingUpdateQueue.java:242)
	at com.intellij.util.concurrency.QueueProcessor.runSafely(QueueProcessor.java:238)
	at com.intellij.util.Alarm$Request.runSafely(Alarm.java:369)
	at com.intellij.util.Alarm$Request.run(Alarm.java:355)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at com.intellij.util.concurrency.SchedulingWrapper$MyScheduledFutureTask.run(SchedulingWrapper.java:220)
	at com.intellij.openapi.application.TransactionGuardImpl.runWithWritingAllowed(TransactionGuardImpl.java:218)
	at com.intellij.openapi.application.TransactionGuardImpl.access$200(TransactionGuardImpl.java:21)
	at com.intellij.openapi.application.TransactionGuardImpl$2.run(TransactionGuardImpl.java:200)
	at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:781)
	at com.intellij.openapi.application.impl.ApplicationImpl.lambda$invokeLater$4(ApplicationImpl.java:319)
	at com.intellij.openapi.application.impl.FlushQueue.doRun(FlushQueue.java:84)
	at com.intellij.openapi.application.impl.FlushQueue.runNextEvent(FlushQueue.java:133)
	at com.intellij.openapi.application.impl.FlushQueue.flushNow(FlushQueue.java:46)
	at com.intellij.openapi.application.impl.FlushQueue$FlushNow.run(FlushQueue.java:189)
	at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:776)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:727)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:746)
	at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:969)
	at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:839)
	at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$8(IdeEventQueue.java:449)
	at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:808)
	at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$9(IdeEventQueue.java:448)
	at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:781)
	at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:496)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)

[pixelpax]

I have a similar issue! Bump!

I made a jetbrains bug report here but I suspect the issue is actually within this repo!

[pixelpax]

@kirillgla this strikes me as P0, since it prevents any execution and fails to communicate problem details to user.

I would be willing to help with this because I really want to use this tool, but I would need guidance since I'm very out of my depth here.

[pixelpax]

Ok-- @kirillgla I found the workaround you posted. I think this resolves the worst of the problem:

you need to open Edit > Project Settings > Editor > C# Project Generation, edit Additional extensions to include and add the following extensions to it: tt;t4;ttinclude. Then you need to re-generate project files (which can be done using Edit > Preferences > External Tools > Regenerate project files).

Thank you! And thank you for all the hard work you did to make this excellent extension! It would be nice to have this added to the jetbrains unity package, since this was difficult to track down.