add show_subtree command for viewing tree-sitter subtree in Popup (#1453)

* add show_subtree command for viewing tree-sitter subtree in Popup

* remove '.slice(..)' from show_subtree command

* name docs and subtree Popups 'hover'

2 files changed, 34 insertions, 2 deletions

diff --git a/helix-term/src/commands.rs b/helix-term/src/commands.rs
index 71ac8f09..1a53f14e 100644
--- a/helix-term/src/commands.rs
+++ b/helix-term/src/commands.rs
@@ -400,6 +400,7 @@ impl MappableCommand {
         decrement, "Decrement",
         record_macro, "Record macro",
         replay_macro, "Replay macro",
+        show_subtree, "Show tree-sitter subtree under primary selection",
     );
 }
 
@@ -5388,8 +5389,8 @@ fn hover(cx: &mut Context) {
                 // skip if contents empty
 
                 let contents = ui::Markdown::new(contents, editor.syn_loader.clone());
-                let popup = Popup::new("documentation", contents);
-                if let Some(doc_popup) = compositor.find_id("documentation") {
+                let popup = Popup::new("hover", contents);
+                if let Some(doc_popup) = compositor.find_id("hover") {
                     *doc_popup = popup;
                 } else {
                     compositor.push(Box::new(popup));
@@ -6210,3 +6211,33 @@ fn replay_macro(cx: &mut Context) {
         },
     ));
 }
+
+fn show_subtree(cx: &mut Context) {
+    let (view, doc) = current!(cx.editor);
+
+    if let Some(syntax) = doc.syntax() {
+        let primary_selection = doc.selection(view.id).primary();
+        let text = doc.text();
+        let from = text.char_to_byte(primary_selection.from());
+        let to = text.char_to_byte(primary_selection.to());
+        if let Some(selected_node) = syntax
+            .tree()
+            .root_node()
+            .descendant_for_byte_range(from, to)
+        {
+            let contents = format!("```tsq\n{}\n```", selected_node.to_sexp());
+
+            cx.callback = Some(Box::new(
+                move |compositor: &mut Compositor, cx: &mut compositor::Context| {
+                    let contents = ui::Markdown::new(contents, cx.editor.syn_loader.clone());
+                    let popup = Popup::new("hover", contents);
+                    if let Some(doc_popup) = compositor.find_id("hover") {
+                        *doc_popup = popup;
+                    } else {
+                        compositor.push(Box::new(popup));
+                    }
+                },
+            ));
+        }
+    }
+}
diff --git a/languages.toml b/languages.toml
index e9d5af0e..af15c654 100644
--- a/languages.toml
+++ b/languages.toml
@@ -378,6 +378,7 @@ scope = "source.tsq"
 file-types = ["scm"]
 roots = []
 comment-token = ";"
+injection-regex = "tsq"
 indent = { tab-width = 2, unit = "  " }
 
 [[language]]