Add modal input state and rails

src/leader.zig

@@ -21,6 +21,8 @@ pub const Action = union(enum) {
     quit,
     open: []u8,
     symbol: symbol_mod.Symbol,
+    repeat_rail,
+    restore_last,
     not_built: Feature,
 
     pub fn deinit(self: Action, allocator: std.mem.Allocator) void {
@@ -66,7 +68,7 @@ pub const Leader = struct {
         if (self.message) |message| return message;
         return switch (self.mode) {
             .idle => "",
-            .rail => "leader: s save  q quit  o open  p symbols  / search  x close",
+            .rail => "leader: s save  q quit  o open  p symbols  r repeat  / search  x close",
             .symbol_rail => symbol_mod.rail_status,
             .open_prompt => "open: type path, Enter opens, Esc cancels",
         };
@@ -84,6 +86,10 @@ pub const Leader = struct {
         return self.open_prompt.items;
     }
 
+    pub fn isPromptActive(self: *const Leader) bool {
+        return self.mode == .open_prompt;
+    }
+
     fn handleIdle(self: *Leader, event: input.Event) Action {
         self.message = null;
         switch (event) {
@@ -117,6 +123,10 @@ pub const Leader = struct {
                     self.mode = .symbol_rail;
                     return .none;
                 }
+                if (std.mem.eql(u8, text, "r")) {
+                    self.mode = .idle;
+                    return .repeat_rail;
+                }
                 if (std.mem.eql(u8, text, "/")) {
                     self.mode = .idle;
                     self.message = "search is not built in this profile yet";
@@ -137,7 +147,10 @@ pub const Leader = struct {
                     self.message = "leader cancelled";
                     return .none;
                 },
-                .space => return .none,
+                .space => {
+                    self.mode = .idle;
+                    return .restore_last;
+                },
                 else => {
                     self.mode = .idle;
                     self.message = "unknown leader key";
@@ -233,7 +246,7 @@ test "regular: space opens a visible leader rail and save dispatches" {
     defer leader.deinit();
 
     try expectActionTag(.none, try leader.handleEvent(input.normalize(" ")));
-    try std.testing.expectEqualStrings("leader: s save  q quit  o open  p symbols  / search  x close", leader.status());
+    try std.testing.expectEqualStrings("leader: s save  q quit  o open  p symbols  r repeat  / search  x close", leader.status());
 
     try expectActionTag(.save, try leader.handleEvent(input.normalize("s")));
     try std.testing.expect(!leader.isActive());