feat: new command to open hover documentation in a new buffer instead of a popup

book/src/generated/static-cmd.md

@@ -200,6 +200,7 @@
 | `remove_primary_selection` | Remove primary selection | normal: `` <A-,> ``, select: `` <A-,> `` |
 | `completion` | Invoke completion popup | insert: `` <C-x> `` |
 | `hover` | Show docs for item under cursor | normal: `` <space>k ``, select: `` <space>k `` |
+| `hover_dump` | Show docs for item under cursor in a new buffer | normal: `` <space>K ``, select: `` <space>K `` |
 | `toggle_comments` | Comment/uncomment selections | normal: `` <C-c> ``, `` <space>c ``, select: `` <C-c> ``, `` <space>c `` |
 | `toggle_line_comments` | Line comment/uncomment selections | normal: `` <space><A-c> ``, select: `` <space><A-c> `` |
 | `toggle_block_comments` | Block comment/uncomment selections | normal: `` <space>C ``, select: `` <space>C `` |

book/src/keymap.md

@@ -290,6 +290,7 @@ This layer is a kludge of mappings, mostly pickers.
 | `g`     | Open changed file picker                                                | `changed_file_picker`                      |
 | `G`     | Debug (experimental)                                                    | N/A                                        |
 | `k`     | Show documentation for item under cursor in a [popup](#popup) (**LSP**) | `hover`                                    |
+| `K`     | Show documentation for item under cursor in a new buffer (**LSP**)      | `hover_dump`                                    |
 | `s`     | Open document symbol picker (**LSP**)                                   | `symbol_picker`                            |
 | `S`     | Open workspace symbol picker (**LSP**)                                  | `workspace_symbol_picker`                  |
 | `d`     | Open document diagnostics picker (**LSP**)                              | `diagnostics_picker`                       |

helix-term/src/commands.rs

@@ -476,6 +476,7 @@ impl MappableCommand {
         remove_primary_selection, "Remove primary selection",
         completion, "Invoke completion popup",
         hover, "Show docs for item under cursor",
+        hover_dump, "Show docs for item under cursor in a new buffer",
         toggle_comments, "Comment/uncomment selections",
         toggle_line_comments, "Line comment/uncomment selections",
         toggle_block_comments, "Block comment/uncomment selections",

helix-term/src/commands/lsp.rs

@@ -14,7 +14,7 @@ use tui::{text::Span, widgets::Row};
 use super::{align_view, push_jump, Align, Context, Editor};
 
 use helix_core::{
-    syntax::LanguageServerFeature, text_annotations::InlineAnnotation, Selection, Uri,
+    syntax::LanguageServerFeature, text_annotations::InlineAnnotation, Rope, Selection, Uri,
 };
 use helix_stdx::path;
 use helix_view::{
@@ -1008,7 +1008,10 @@ pub fn signature_help(cx: &mut Context) {
         .trigger_signature_help(SignatureHelpInvoked::Manual, cx.editor)
 }
 
-pub fn hover(cx: &mut Context) {
+pub fn hover_impl<T>(cx: &mut Context, callback: T)
+where
+    T: FnOnce(String, &mut Editor, &mut Compositor) + std::marker::Send + 'static,
+{
     let (view, doc) = current!(cx.editor);
 
     // TODO support multiple language servers (merge UI somehow)
@@ -1049,16 +1052,31 @@ pub fn hover(cx: &mut Context) {
                     lsp::HoverContents::Markup(contents) => contents.value,
                 };
 
-                // skip if contents empty
-
-                let contents = ui::Markdown::new(contents, editor.syn_loader.clone());
-                let popup = Popup::new("hover", contents).auto_close(true);
-                compositor.replace_or_push("hover", popup);
+                callback(contents, editor, compositor);
             }
         },
     );
 }
 
+pub fn hover_dump(cx: &mut Context) {
+    hover_impl(cx, |contents, editor, _compositor| {
+        editor.new_file_from_document(
+            Action::VerticalSplit,
+            Document::from(Rope::from(contents), None, editor.config.clone()),
+        );
+        let hover_doc = doc_mut!(editor);
+        let _ = hover_doc.set_language_by_language_id("markdown", editor.syn_loader.clone());
+    })
+}
+
+pub fn hover(cx: &mut Context) {
+    hover_impl(cx, |contents, editor, compositor| {
+        let contents = ui::Markdown::new(contents, editor.syn_loader.clone());
+        let popup = Popup::new("hover", contents).auto_close(true);
+        compositor.replace_or_push("hover", popup);
+    })
+}
+
 pub fn rename_symbol(cx: &mut Context) {
     fn get_prefill_from_word_boundary(editor: &Editor) -> String {
         let (view, doc) = current_ref!(editor);

helix-term/src/keymap/default.rs

@@ -281,6 +281,7 @@ pub fn default() -> HashMap<Mode, KeyTrie> {
             "R" => replace_selections_with_clipboard,
             "/" => global_search,
             "k" => hover,
+            "K" => hover_dump,
             "r" => rename_symbol,
             "h" => select_references_to_symbol_under_cursor,
             "c" => toggle_comments,

helix-view/src/editor.rs

@@ -1689,7 +1689,7 @@ impl Editor {
         id
     }
 
-    fn new_file_from_document(&mut self, action: Action, doc: Document) -> DocumentId {
+    pub fn new_file_from_document(&mut self, action: Action, doc: Document) -> DocumentId {
         let id = self.new_document(doc);
         self.switch(id, action);
         id