Can't see the signature helper.

[CppCXY]

the lsp reponse about signatureHelper:

{
    "signatureHelpProvider": {
      "triggerCharacters": [
        "(",
        ","
      ]
    }
}

add parameterInfo to plugin.xml:

<codeInsight.parameterInfo
        language="Lua"
        implementationClass="com.redhat.devtools.lsp4ij.features.signatureHelp.LSPParameterInfoHandler"/>

the project url

can download the plugin from: https://github.com/EmmyLua/Intellij-EmmyLua2/actions/runs/10316582699

[CppCXY]

see:

[angelozerr]

If you do Ctr+P inside (), do you see signature help?

[CppCXY]

If you do Ctr+P inside (), do you see signature help?

yes, I can see:

However, it will not update afterwards because my signature can change dynamically.

[angelozerr]

Ok it means LSP signature help is working. If you want to process the signature help when you apply completion, you need to select the standard Show the parameter info popup in ... option (it works like other language like Java).

[angelozerr]

However, it will not update afterwards because my signature can change dynamically.

Sorry I have not understood the problem?

[CppCXY]

Ok it means LSP signature help is working. If you want to process the signature help when you apply completion, you need to select the standard Show the parameter info popup in ... option (it works like other language like Java).

I still can't get the signature unless I press Ctrl+P.

[angelozerr]

Do you see some LSP trace of signature help when you apply completion?

[CppCXY]

Do you see some LSP trace of signature help when you apply completion?

no, I can't see any signature help protocol

[angelozerr]

And if you do ctrl+p?

[CppCXY]

When I press ctrl + p, I always get 2 times signatureHelper protocol

[CppCXY]

I am certain that while editing the code, IntelliJ did not call the findElementForParameterInfo method, so there is no signature helper, I inherited the LSP class and did not find any calls unless I pressed Ctrl+P.

[angelozerr]

The auto popup is opened here

lsp4ij/src/main/java/com/redhat/devtools/lsp4ij/features/completion/LSPCompletionProposal.java

Line 137 in 16d1c5a

popupController.autoPopupParameterInfo(editor, null);

I suggest that you debug LSP4IJ to understand the problem.

[CppCXY]

The auto popup is opened here

lsp4ij/src/main/java/com/redhat/devtools/lsp4ij/features/completion/LSPCompletionProposal.java

Line 137 in 16d1c5a

popupController.autoPopupParameterInfo(editor, null);

I suggest that you debug LSP4IJ to understand the problem.

donot enter the breakpoint

[angelozerr]

If you set a breakpoint in LSPCompletionProposal it should stop when you open completion, right?

If no it means that you cannot debug LSP4IJ

[CppCXY]

If you set a breakpoint in LSPCompletionProposal it should stop when you open completion, right?

If no it means that you cannot debug LSP4IJ

I can debug in other method

[CppCXY]

it can be invoke when this completionItem can execute command:

[CppCXY]

it can be invoke when this completionItem can execute command

My mistake, it will only be called when selected completion and tab, but cannot be invoked during normal typing.

[angelozerr]

Exactly! Is it working when you select completion ? This behavior is the same for other languages like Java, right?

[CppCXY]

Exactly! Is it working when you select completion ? This behavior is the same for other languages like Java, right?

Even when completion is selected, paramInfo still cannot be triggered. I tried customizing an empty paramInfoHandler, but it still couldn't hit the breakpoint during typing. I think this might be related to the PSI system.

[angelozerr]

I think this might be related to the PSI system.

I think so, I suggest that you debug the Jetbrains code of the autoPopupParameterInfo.

[CppCXY]

I found that it was because LSPTypedHandler returned stop:

which caused the subsequent execution to fail.

[CppCXY]

when I change to continue:

it work well:

so why is it return stop?