feat: support multiple prefix keys (#4653)

* feat: support multiple prefix keys

keys.prefix accepts an array in addition to a single string so one
config can define several prefix keys. Every configured prefix enters
the same prefix mode, and the help panel lists them all.

Published keybinding profiles keep the primary prefix as a scalar and
carry the rest in an optional extra_prefixes field so older clients
keep working with the primary prefix.

* fix: reject an empty prefix list on reload

An explicitly empty keys.prefix array now stays empty through config
parsing so validation rejects it and a reload keeps the current
keybindings instead of silently falling back to ctrl+b.

1 files changed, 16 insertions, 2 deletions

diff --git a/src/input/keybind_help.rs b/src/input/keybind_help.rs
index 2f89b861..cb1fdb99 100644
--- a/src/input/keybind_help.rs
+++ b/src/input/keybind_help.rs
@@ -63,13 +63,13 @@ fn indexed_range_prefix(bindings: &[IndexedKeybind]) -> Option<&str> {
 
 pub(crate) fn keybind_help_groups(
     keybinds: &Keybinds,
-    prefix: (crossterm::event::KeyCode, crossterm::event::KeyModifiers),
+    prefixes: &[crate::config::KeyCombo],
 ) -> Vec<KeybindHelpGroup> {
     let mut groups = vec![
         (
             "global",
             vec![
-                entry(crate::config::format_key_combo(prefix), "prefix mode"),
+                entry(crate::config::format_prefix_combos(prefixes), "prefix mode"),
                 entry(binding_label(&keybinds.help), "keybinds"),
                 entry(binding_label(&keybinds.settings), "settings"),
                 entry(binding_label(&keybinds.detach), "detach"),
@@ -267,4 +267,18 @@ mod tests {
         assert_eq!(filtered[0].1[0].1, "close pane");
         assert!(filter_keybind_help_groups(groups(), "panes").is_empty());
     }
+
+    #[test]
+    fn help_lists_every_configured_prefix() {
+        let groups = keybind_help_groups(
+            &Keybinds::default(),
+            &[
+                (KeyCode::Char(' '), KeyModifiers::CONTROL),
+                (KeyCode::Char('s'), KeyModifiers::CONTROL),
+            ],
+        );
+        let global = &groups[0].1;
+        assert_eq!(global[0].0, "ctrl+space / ctrl+s");
+        assert_eq!(global[0].1, "prefix mode");
+    }
 }