feat(lsp): implement show document request (#8865)

* feat(lsp): implement show document request

Implement [window.showDocument](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#window_showDocument)
LSP server-sent request.

This PR builds on top of helix-editor#5820,
moves the external-URL opening functionality into shared crate-level
function that returns a callback that is now used by both the
`open_file` command as well as the window.showDocument handler if
the URL is marked as external.

* add return

* use vertical split

* refactor

---------

Co-authored-by: Michael Davis <mcarsondavis@gmail.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/helix-lsp/src/lib.rs b/helix-lsp/src/lib.rs
index 34278cd5..83625897 100644
--- a/helix-lsp/src/lib.rs
+++ b/helix-lsp/src/lib.rs
@@ -549,6 +549,7 @@ pub enum MethodCall {
     WorkspaceConfiguration(lsp::ConfigurationParams),
     RegisterCapability(lsp::RegistrationParams),
     UnregisterCapability(lsp::UnregistrationParams),
+    ShowDocument(lsp::ShowDocumentParams),
 }
 
 impl MethodCall {
@@ -576,6 +577,10 @@ impl MethodCall {
                 let params: lsp::UnregistrationParams = params.parse()?;
                 Self::UnregisterCapability(params)
             }
+            lsp::request::ShowDocument::METHOD => {
+                let params: lsp::ShowDocumentParams = params.parse()?;
+                Self::ShowDocument(params)
+            }
             _ => {
                 return Err(Error::Unhandled);
             }