eglot-completion-at-point function defintion

[narendraj9]

I am mainly curious about why eglot-completion-at-point is implemented the way it is.

Copied from (#744 (reply in thread)):

In the definition of eglot-completion-at-point, the completion table has the list of label values (

eglot/eglot.el

Line 2329 in c17bdf6

(string-trim-left label))

). These label values returned from the server are usually things that are annotated (e.g. the name of the method with the type signatgure of a method). Once a completion candidate is selected, this label gets inserted into the buffer. After that, the :exit-function (defined at

eglot/eglot.el

Line 2417 in c17bdf6

:exit-function

) deletes extra text that got inserted and also applies textEdits received from the server. For example, here is an event:

(:jsonrpc "2.0" :id 313 :method "completionItem/resolve" :params
          (:label
           #("abort(AAbort aa) : void" 0 1
             (eglot--lsp-item #1))
           :kind 2 :detail "Association.abort(AAbort aa) : void" :sortText "999999035" :insertText "abort" :insertTextFormat 2 :textEdit
           (:range
            (:start
             (:line 241 :character 11)
             :end
             (:line 241 :character 11))
            :newText "abort(${1:aa});")
           :data
           (:decl_signature "Lorg.dcm4che3.net.Association;" :signature "(Lorg.dcm4che3.net.pdu.AAbort;)V" :name "abort" :pid "0" :rid "52" :uri "file:///home/narendra/code/dcm4che/dcm4che-net/src/main/java/org/dcm4che3/net/State.java")))

Before sending the completionItem/resolve request to the LSP server, we have already inserted the :label text. We are eventually going to insert the expanded snippet that's present in textEdit.

Can we use something other than the :label value as the initial text that is inserted? Is it possible to not insert anything at all and wait for things to settle down until we have a fully expanded completion string?