Better scratch file support

[michael-pratt]

Currently, the default file type for Excalidraw on the scratch menu is a JSON type, which causes the IDE to open a new JSON editor instead of a diagram editor. As an enhancement, it would be nice if the scratch file menu instead opened a diagram editor so users could go straight to the Excalidraw UI.

[michael-pratt]

I have a proposed solution for this, will open a PR after a bit more testing.

[bric3]

Possibly fixed by #91

[xuanswe]

Possibly fixed by #91

Not sure if that's the fix for the error I have now.

When open scratch file

java.lang.Throwable: [LOGSEVERITY_ERROR][https://excalidraw-jetbrains-plugin/index.html:1]:
Uncaught SyntaxError: Unexpected end of JSON input
	at com.intellij.openapi.diagnostic.Logger.error(Logger.java:202)
	at com.github.bric3.excalidraw.editor.ExcalidrawWebViewController$initJcefPanel$5.onConsoleMessage(ExcalidrawWebViewController.kt:219)
	at com.intellij.ui.jcef.JBCefClient$3.lambda$onConsoleMessage$4(JBCefClient.java:305)
	at com.intellij.ui.jcef.JBCefClient$HandlerSupport.lambda$handle$0(JBCefClient.java:717)
	at java.base/java.lang.Iterable.forEach(Iterable.java:75)
	at java.base/java.util.Collections$SynchronizedCollection.forEach(Collections.java:2131)
	at com.intellij.ui.jcef.JBCefClient$HandlerSupport.handle(JBCefClient.java:717)
	at com.intellij.ui.jcef.JBCefClient$HandlerSupport.handleBoolean(JBCefClient.java:722)
	at com.intellij.ui.jcef.JBCefClient$3.onConsoleMessage(JBCefClient.java:304)
	at jcef/org.cef.CefClient.onConsoleMessage(CefClient.java:351)

When close scratch file

Unhandled exception in [StandaloneCoroutine{Cancelling}@4a92e9d9, Dispatchers.Default]

java.lang.AssertionError: Not alive: Lifetime `Anonymous` [Terminating, executing=0, resources=4]
	at com.jetbrains.rd.util.lifetime.RLifetimeKt.assertAlive(RLifetime.kt:524)
	at com.github.bric3.excalidraw.editor.ExcalidrawWebViewController.runJS(ExcalidrawWebViewController.kt:349)
	at com.github.bric3.excalidraw.editor.ExcalidrawWebViewController.saveAsCoroutines(ExcalidrawWebViewController.kt:333)
	at com.github.bric3.excalidraw.editor.ExcalidrawEditor$saveCoroutines$1.invokeSuspend(ExcalidrawEditor.kt:210)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)
	at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:570)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:750)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:677)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:664)
	Suppressed: kotlinx.coroutines.DiagnosticCoroutineContextException: [StandaloneCoroutine{Cancelled}@4a92e9d9, Dispatchers.Default]

IntelliJ IDEA 2022.3.2 (Ultimate Edition)
Build #IU-223.8617.56, built on January 26, 2023
Runtime version: 17.0.5+1-b653.25 amd64
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o.
Windows 10 10.0
GC: G1 Young Generation, G1 Old Generation
Memory: 4096M
Cores: 32
Registry:
    editor.minimap.enabled=true

Non-Bundled Plugins:
    com.github.bric3.excalidraw (0.3.2)

Kotlin: 223-1.8.0-release-345-IJ8617.56

[bric3]

@xuan-nguyen-swe These errors are unrelated to scratch file support.

The not alive error is one of the error I don't quite know how to tackle. I believe you can dismiss it.

However the first one is an error from the excalidraw embedded app.

Uncaught SyntaxError: Unexpected end of JSON input

The message suggests the file is possibly invalid, or that it cannot be read by the embedded excalidraw for some reasons.

[bric3]

@xuan-nguyen-swe @michael-pratt Scratch file creation is now fixed. It'll be in 0.4.0. Still quite a few things to do.

2024-01-09 01:00:04,421 [ 757800] SEVERE - #com.github.bric3.excalidraw.editor.ExcalidrawWebViewController - scratch.excalidraw: [LOGSEVERITY_ERROR][https://excalidraw-jetbrains-plugin/index.html:1]:
Uncaught SyntaxError: Unexpected end of JSON input
java.lang.Throwable: scratch.excalidraw: [LOGSEVERITY_ERROR][https://excalidraw-jetbrains-plugin/index.html:1]:
Uncaught SyntaxError: Unexpected end of JSON input
    	at com.intellij.openapi.diagnostic.Logger.error(Logger.java:370)
    	at com.github.bric3.excalidraw.editor.ExcalidrawWebViewController$initJcefPanel$5.onConsoleMessage(ExcalidrawWebViewController.kt:202)
	at com.intellij.ui.jcef.JBCefClient$3.lambda$onConsoleMessage$4(JBCefClient.java:305)
	at com.intellij.ui.jcef.JBCefClient$HandlerSupport.lambda$handle$0(JBCefClient.java:719)
	at java.base/java.lang.Iterable.forEach(Iterable.java:75)
	at java.base/java.util.Collections$SynchronizedCollection.forEach(Collections.java:2131)
	at com.intellij.ui.jcef.JBCefClient$HandlerSupport.handle(JBCefClient.java:719)
	at com.intellij.ui.jcef.JBCefClient$HandlerSupport.handleBoolean(JBCefClient.java:724)
	at com.intellij.ui.jcef.JBCefClient$3.onConsoleMessage(JBCefClient.java:304)
	at jcef/org.cef.CefClient.onConsoleMessage(CefClient.java:354)