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, 23 insertions, 0 deletions

diff --git a/helix-term/src/lib.rs b/helix-term/src/lib.rs
index a94c5e49..a1d60329 100644
--- a/helix-term/src/lib.rs
+++ b/helix-term/src/lib.rs
@@ -12,7 +12,11 @@ pub mod keymap;
 pub mod ui;
 use std::path::Path;
 
+use futures_util::Future;
 use ignore::DirEntry;
+use url::Url;
+
+pub use keymap::macros::*;
 
 #[cfg(not(windows))]
 fn true_color() -> bool {
@@ -46,3 +50,22 @@ fn filter_picker_entry(entry: &DirEntry, root: &Path, dedup_symlinks: bool) -> b
 
     true
 }
+
+/// Opens URL in external program.
+fn open_external_url_callback(
+    url: Url,
+) -> impl Future<Output = Result<job::Callback, anyhow::Error>> + Send + 'static {
+    let commands = open::commands(url.as_str());
+    async {
+        for cmd in commands {
+            let mut command = tokio::process::Command::new(cmd.get_program());
+            command.args(cmd.get_args());
+            if command.output().await.is_ok() {
+                return Ok(job::Callback::Editor(Box::new(|_| {})));
+            }
+        }
+        Ok(job::Callback::Editor(Box::new(move |editor| {
+            editor.set_error("Opening URL in external program failed")
+        })))
+    }
+}