Migrate commands from E3 to E4 in org.eclipse.terminal.view.ui bundle #2205

Copilot · 2025-10-21T05:21:50Z

Summary:
Successfully migrated all commands and handlers from E3 to E4 in org.eclipse.terminal.view.ui bundle following the Eclipse 4 Migration Guide.

Latest Update:
Updated QuickAccessHandler, MaximizeViewHandler, and NewTerminalViewHandler to use E4 command services (ECommandService and EHandlerService) via dependency injection instead of accessing ICommandService through PlatformUI singleton. This follows the proper E4 pattern for programmatic command execution.

Changes Made:

Created fragment.e4xmi with E4 model definitions for 5 commands and their handlers
Registered the fragment in plugin.xml
Updated MANIFEST.MF to include E4 dependencies and Jakarta annotations/inject packages
Converted 5 handler classes to use E4 dependency injection with @Execute and @CanExecute annotations
Removed E3 command and handler registrations from plugin.xml
Updated handlers to use ECommandService/EHandlerService for command execution
Updated build.properties to include the fragment file

Commands Migrated:

org.eclipse.terminal.view.ui.command.launch
org.eclipse.terminal.view.ui.command.launchConsole
org.eclipse.terminal.view.ui.command.launchToolbar
org.eclipse.terminal.view.ui.command.disconnect
org.eclipse.terminal.view.ui.command.newview

Handlers Converted:

LaunchTerminalCommandHandler (3 instances)
DisconnectTerminalCommandHandler
MaximizeViewHandler (now uses E4 services)
QuickAccessHandler (now uses E4 services)
NewTerminalViewHandler (now uses E4 services)

All command IDs are preserved to maintain backward compatibility.

Reference: #2042

Original prompt

Convert commands from E3 to E4 in bundle org.eclipse.terminal.view.ui

We have the E4 migration guide here https://github.com/eclipse-platform/eclipse.platform.ui/blob/master/docs/Eclipse4_Migration.md

As described ther we want to migrate all commands from E3 to E4 in the mentioned bundle.

Reference but do not close #2042

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Co-authored-by: laeubi <[email protected]>

laeubi · 2025-10-21T05:32:41Z

....view.ui/src/org/eclipse/terminal/view/ui/internal/handler/LaunchTerminalCommandHandler.java

+	 * Determines the command ID based on the active part context.
+	 * In E4, we can't directly access the command ID from the event, so we use
+	 * a default behavior.


@vogella @opcoach @ruspl-afed is this correct? If not what would be the E4 way of doing this? If yes, please open an issue and link it here so we can keep track of missing E4 functionality.

laeubi · 2025-10-21T05:35:37Z

...view.ui/src/org/eclipse/terminal/view/ui/internal/handler/AbstractTriggerCommandHandler.java

+	 * @param commandId The command id. Must not be <code>null</code>.
+	 * @param selection The selection to pass on to the command or <code>null</code>.
+	 */
+	protected static void triggerCommandStatic(String commandId, ISelection selection) {


@opcoach @vogella @ruspl-afed we need a link to some documentation what is the correct E4 way to trigger commands so we can instruct copilote here to not use PlatformUI!

At best this would be done by an enhancement to the https://github.com/eclipse-platform/eclipse.platform.ui/blob/master/docs/Eclipse4_Migration.md file so it is discoverable by copilote in the future.

I started a documentation task here now:

Add Eclipse 4 Commands documentation and migration guide eclipse.platform.ui#3419

@copilot the migration doc was enhanced to support how to programmatically call commands in E4:

https://github.com/eclipse-platform/eclipse.platform.ui/blob/master/docs/Eclipse4_Migration.md#migrate-programmatic-command-execution

please adjust the code to use the E4 Command service instead of ICommandService static singelton from PlatformUI!

Updated to use E4 command services. QuickAccessHandler, MaximizeViewHandler, and NewTerminalViewHandler now inject ECommandService and EHandlerService instead of accessing ICommandService through PlatformUI singleton.

Commit: The changes will be in the next commit.

laeubi · 2025-10-21T05:38:27Z

terminal/bundles/org.eclipse.terminal.view.ui/plugin.xml

-            <enabledWhen>
-               <with variable="activePart">
-                  <instanceof value="org.eclipse.terminal.view.ui.ITerminalsView"/>
-                  <test property="org.eclipse.terminal.view.ui.canDisconnect" value="true"/>
-               </with>
-            </enabledWhen>


For me it looks like this should become a core expression instead of doing it "in code" @mickaelistria wdyt?

@vogella @opcoach @ruspl-afed it seems handler in E4 can currently only use annotated code based enablement, should we allow core expressions as well? If yes please add an issue so we can track missing E4 features!

Submitted a task now to support core expressions for handlers:

Add CoreExpression support for handler enablement in E4 model eclipse.platform.ui#3420

@laeubi In e4 the handler can be assigned to the part directly, instead of "enabling it" whenever the part gets selected. If you look at the part in the model editor you see that the handler can be assigned directly to it. When Paul did redesign the handlers he wanted to get aways from the "all handlers are on the same level and you need to have additonal logic to make them available for only one part".

Btw, I think it would be better to have an issue for discussion instead of lots of different PR with questions.

@vogella PR are issues ... just in case anyways before the PR one can hardly know what issues arise.

Can you provide an example how this should be handled to the migration docs for reference?

@vogella thanks, I'm lloking into it, I assume the

<test property="org.eclipse.terminal.view.ui.canDisconnect" value="true"/>

would then be need to be implemented in code additionally so one can only "save" the check for the part itself?

Also it means it can only be accomplished when migrating the part first...

Also I'm a bit confused how to distinguish the case where <enabledWhen> versus <activeWhen>

IIRC the replacement for is the CanExecute and you should be able to inject properties into this method. You can check via the context spy.

Co-authored-by: laeubi <[email protected]>

ruspl-afed · 2025-10-22T16:27:15Z

....view.ui/src/org/eclipse/terminal/view/ui/internal/handler/LaunchTerminalCommandHandler.java

+	private String determineCommandId(MPart activePart) {
+		// Default to launch command - this will be differentiated by the E4 model
+		// which can bind different instances of this handler to different commands
+		return "org.eclipse.terminal.view.ui.command.launch"; //$NON-NLS-1$


What I'm afraid of is that we'll make the code less maintainable by introducing literals like these that represent command identifiers or other contribution identifiers.
What if we generate something like Android R class from e4xmi and then use it for places like that? In this case we will have help of compiler to control values. With string literal in the current state it will be too easy to break the functionality, especially when referencing contribution from another bundle.

ruspl-afed · 2025-10-22T16:29:27Z

terminal/bundles/org.eclipse.terminal.view.ui/fragment.e4xmi

+<?xml version="1.0" encoding="ASCII"?>
+<fragment:ModelFragments xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:commands="http://www.eclipse.org/ui/2010/UIModel/application/commands" xmlns:fragment="http://www.eclipse.org/ui/2010/UIModel/fragment" xmi:id="_fragment">
+  <fragments xsi:type="fragment:StringModelFragment" xmi:id="_commands_fragment" featurename="commands" parentElementId="org.eclipse.e4.legacy.ide.application">
+    <elements xsi:type="commands:Command" xmi:id="_command_launch" elementId="org.eclipse.terminal.view.ui.command.launch" commandName="Launch Terminal" description="Launch Terminal"/>


i18n was lost

Initial plan

d966cd6

Copilot AI assigned Copilot and laeubi Oct 21, 2025

Copilot started work on behalf of laeubi October 21, 2025 05:22 View session

Migrate commands and handlers from E3 to E4

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Co-authored-by: laeubi <[email protected]>

Copilot AI changed the title ~~[WIP] Migrate commands from E3 to E4 in terminal view bundle~~ Migrate commands from E3 to E4 in org.eclipse.terminal.view.ui bundle Oct 21, 2025

Copilot AI requested a review from laeubi October 21, 2025 05:31

Copilot finished work on behalf of laeubi October 21, 2025 05:31

laeubi reviewed Oct 21, 2025

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Copilot started work on behalf of laeubi October 21, 2025 08:04 View session

Use E4 command services instead of PlatformUI singleton

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Co-authored-by: laeubi <[email protected]>

Copilot AI requested a review from laeubi October 21, 2025 08:07

Copilot finished work on behalf of laeubi October 21, 2025 08:07

ruspl-afed reviewed Oct 22, 2025

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Copilot AI commented Oct 21, 2025 •

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