Add support for Unicode input

ref: https://github.com/helix-editor/helix/issues/1438
ref: https://github.com/helix-editor/helix/pull/2852

2 files changed, 50 insertions, 0 deletions

diff --git a/helix-term/src/commands.rs b/helix-term/src/commands.rs
index 2094aafe..c9874e8c 100644
--- a/helix-term/src/commands.rs
+++ b/helix-term/src/commands.rs
@@ -511,6 +511,7 @@ impl MappableCommand {
         extend_to_word, "Extend to a two-character label",
         open_or_focus_explorer, "Open or focus explorer",
         reveal_current_file, "Reveal current file in explorer",
+        insert_digraph, "Insert Unicode characters with prompt",
     );
 }
 
@@ -6268,3 +6269,50 @@ fn jump_to_word(cx: &mut Context, behaviour: Movement) {
     }
     jump_to_label(cx, words, behaviour)
 }
+
+fn insert_digraph(cx: &mut Context) {
+    ui::prompt(
+        cx,
+        "digraph:".into(),
+        Some('K'), // todo: decide on register to use
+        move |editor, input| {
+            editor
+                .config()
+                .digraphs
+                .search(input)
+                .take(10)
+                .map(|entry| {
+                    // todo: Prompt does not currently allow additional text as part
+                    // of it's suggestions. Show the user the symbol and description
+                    // once prompt has been made more robust
+                    #[allow(clippy::useless_format)]
+                    ((0..), Cow::from(format!("{}", entry.sequence)))
+                })
+                .collect()
+        },
+        move |cx, input, event| {
+            match event {
+                PromptEvent::Validate => (),
+                _ => return,
+            }
+            let config = cx.editor.config();
+            let symbols = if let Some(entry) = config.digraphs.get(input) {
+                &entry.symbols
+            } else {
+                cx.editor.set_error("Digraph not found");
+                return;
+            };
+
+            let (view, doc) = current!(cx.editor);
+            let selection = doc.selection(view.id);
+            let mut changes = Vec::with_capacity(selection.len());
+
+            for range in selection.ranges() {
+                changes.push((range.from(), range.from(), Some(symbols.clone().into())));
+            }
+            let trans = Transaction::change(doc.text(), changes.into_iter());
+            doc.apply(&trans, view.id);
+            doc.append_changes_to_history(view);
+        },
+    )
+}
diff --git a/helix-term/src/keymap/default.rs b/helix-term/src/keymap/default.rs
index 5b165613..3cd4c0e3 100644
--- a/helix-term/src/keymap/default.rs
+++ b/helix-term/src/keymap/default.rs
@@ -138,6 +138,8 @@ pub fn default() -> HashMap<Mode, KeyTrie> {
         "N" => search_prev,
         "*" => search_selection,
 
+        "\\" => insert_digraph,
+
         "u" => undo,
         "U" => redo,
         "A-u" => earlier,