feat(command): select_all_children

helix-core/src/object.rs

@@ -63,7 +63,21 @@ pub fn select_all_siblings(tree: &Tree, text: RopeSlice, selection: Selection) -
         root_node
             .descendant_for_byte_range(from, to)
             .and_then(find_parent_with_more_children)
-            .map(|parent| select_children(parent, text, range.direction()))
+            .and_then(|parent| select_children(parent, text, range.direction()))
+            .unwrap_or_else(|| vec![range].into_iter())
+    })
+}
+
+pub fn select_all_children(tree: &Tree, text: RopeSlice, selection: Selection) -> Selection {
+    let root_node = &tree.root_node();
+
+    selection.transform_iter(|range| {
+        let from = text.char_to_byte(range.from());
+        let to = text.char_to_byte(range.to());
+
+        root_node
+            .descendant_for_byte_range(from, to)
+            .and_then(|parent| select_children(parent, text, range.direction()))
             .unwrap_or_else(|| vec![range].into_iter())
     })
 }
@@ -72,10 +86,11 @@ fn select_children(
     node: Node,
     text: RopeSlice,
     direction: Direction,
-) -> <Vec<Range> as std::iter::IntoIterator>::IntoIter {
+) -> Option<<Vec<Range> as std::iter::IntoIterator>::IntoIter> {
     let mut cursor = node.walk();
 
-    node.named_children(&mut cursor)
+    let children = node
+        .named_children(&mut cursor)
         .map(|child| {
             let from = text.byte_to_char(child.start_byte());
             let to = text.byte_to_char(child.end_byte());
@@ -86,8 +101,13 @@ fn select_children(
                 Range::new(from, to)
             }
         })
-        .collect::<Vec<_>>()
-        .into_iter()
+        .collect::<Vec<_>>();
+
+    if !children.is_empty() {
+        Some(children.into_iter())
+    } else {
+        None
+    }
 }
 
 fn find_sibling_recursive<F>(node: Node, sibling_fn: F) -> Option<Node>

helix-term/src/commands.rs

@@ -440,7 +440,8 @@ impl MappableCommand {
         shrink_selection, "Shrink selection to previously expanded syntax node",
         select_next_sibling, "Select next sibling in the syntax tree",
         select_prev_sibling, "Select previous sibling the in syntax tree",
-        select_all_siblings, "Select all siblings in the syntax tree",
+        select_all_siblings, "Select all siblings of the current node",
+        select_all_children, "Select all children of the current node",
         jump_forward, "Jump forward on jumplist",
         jump_backward, "Jump backward on jumplist",
         save_selection, "Save current selection to jumplist",
@@ -4995,6 +4996,23 @@ fn select_all_siblings(cx: &mut Context) {
     cx.editor.apply_motion(motion);
 }
 
+fn select_all_children(cx: &mut Context) {
+    let motion = |editor: &mut Editor| {
+        let (view, doc) = current!(editor);
+
+        if let Some(syntax) = doc.syntax() {
+            let text = doc.text().slice(..);
+            let current_selection = doc.selection(view.id);
+            let selection =
+                object::select_all_children(syntax.tree(), text, current_selection.clone());
+            doc.set_selection(view.id, selection);
+        }
+    };
+
+    motion(cx.editor);
+    cx.editor.last_motion = Some(Motion(Box::new(motion)));
+}
+
 fn match_brackets(cx: &mut Context) {
     let (view, doc) = current!(cx.editor);
     let is_select = cx.editor.mode == Mode::Select;

helix-term/src/keymap/default.rs

@@ -87,6 +87,7 @@ pub fn default() -> HashMap<Mode, KeyTrie> {
         "A-;" => flip_selections,
         "A-o" | "A-up" => expand_selection,
         "A-i" | "A-down" => shrink_selection,
+        "A-I" | "A-S-down" => select_all_children,
         "A-p" | "A-left" => select_prev_sibling,
         "A-n" | "A-right" => select_next_sibling,
         "A-e" => move_parent_node_end,

helix-term/tests/test/commands/movement.rs

@@ -601,3 +601,128 @@ async fn select_all_siblings() -> anyhow::Result<()> {
 
     Ok(())
 }
+
+#[tokio::test(flavor = "multi_thread")]
+async fn select_all_children() -> anyhow::Result<()> {
+    let tests = vec![
+        // basic tests
+        (
+            helpers::platform_line(indoc! {r##"
+                let foo = bar#[(a, b, c)|]#;
+            "##}),
+            "<A-I>",
+            helpers::platform_line(indoc! {r##"
+                let foo = bar(#[a|]#, #(b|)#, #(c|)#);
+            "##}),
+        ),
+        (
+            helpers::platform_line(indoc! {r##"
+                let a = #[[
+                    1,
+                    2,
+                    3,
+                    4,
+                    5,
+                ]|]#;
+            "##}),
+            "<A-I>",
+            helpers::platform_line(indoc! {r##"
+                let a = [
+                    #[1|]#,
+                    #(2|)#,
+                    #(3|)#,
+                    #(4|)#,
+                    #(5|)#,
+                ];
+            "##}),
+        ),
+        // direction is preserved
+        (
+            helpers::platform_line(indoc! {r##"
+                let a = #[|[
+                    1,
+                    2,
+                    3,
+                    4,
+                    5,
+                ]]#;
+            "##}),
+            "<A-I>",
+            helpers::platform_line(indoc! {r##"
+                let a = [
+                    #[|1]#,
+                    #(|2)#,
+                    #(|3)#,
+                    #(|4)#,
+                    #(|5)#,
+                ];
+            "##}),
+        ),
+        // can't pick any more children - selection stays the same
+        (
+            helpers::platform_line(indoc! {r##"
+                let a = [
+                    #[1|]#,
+                    #(2|)#,
+                    #(3|)#,
+                    #(4|)#,
+                    #(5|)#,
+                ];
+            "##}),
+            "<A-I>",
+            helpers::platform_line(indoc! {r##"
+                let a = [
+                    #[1|]#,
+                    #(2|)#,
+                    #(3|)#,
+                    #(4|)#,
+                    #(5|)#,
+                ];
+            "##}),
+        ),
+        // each cursor does the sibling select independently
+        (
+            helpers::platform_line(indoc! {r##"
+                let a = #[|[
+                    1,
+                    2,
+                    3,
+                    4,
+                    5,
+                ]]#;
+
+                let b = #([
+                    "one",
+                    "two",
+                    "three",
+                    "four",
+                    "five",
+                ]|)#;
+            "##}),
+            "<A-I>",
+            helpers::platform_line(indoc! {r##"
+                let a = [
+                    #[|1]#,
+                    #(|2)#,
+                    #(|3)#,
+                    #(|4)#,
+                    #(|5)#,
+                ];
+
+                let b = [
+                    #("one"|)#,
+                    #("two"|)#,
+                    #("three"|)#,
+                    #("four"|)#,
+                    #("five"|)#,
+                ];
+            "##}),
+        ),
+    ];
+
+    for test in tests {
+        test_with_config(AppBuilder::new().with_file("foo.rs", None), test).await?;
+    }
+
+    Ok(())
+}