Add select object rail

src/tui.zig

@@ -33,6 +33,7 @@ const PrefixRail = enum {
     none,
     insert_space,
     match,
+    select_object,
     go,
     repeat,
     delete,
@@ -568,6 +569,7 @@ pub const Client = struct {
             .none => if (self.pending_count != 0) "count pending" else "",
             .insert_space => "insert-space: n normal  Space literal  text commits space+text",
             .match => "match: m jump  s inside  a around  ( { [ quotes",
+            .select_object => "select-object: w word  l line  i indent  p param  f form  d diagnostic",
             .go => "go: d definition  r references  e diagnostic  a parameter",
             .repeat => "repeat: digits count  . repeat-last",
             .delete => "delete: d line  h previous-char  l char",
@@ -1198,6 +1200,7 @@ pub const Client = struct {
                 if (std.mem.eql(u8, text, "b")) return self.repeatSelectionProtocol("command move_word_back", self.takeRepeat());
                 if (std.mem.eql(u8, text, "e")) return self.repeatSelectionProtocol("command move_word_end", self.takeRepeat());
                 if (std.mem.eql(u8, text, "m")) return self.openPrefix(.match);
+                if (std.mem.eql(u8, text, "o")) return self.openPrefix(.select_object);
                 if (std.mem.eql(u8, text, "g")) return self.openPrefix(.go);
                 if (text.len == 1) {
                     if (self.objectRangeForKey(text[0])) |range| {
@@ -1256,6 +1259,9 @@ pub const Client = struct {
             .match => self.applyMatchRail(event) catch |err| {
                 self.message = @errorName(err);
             },
+            .select_object => self.applySelectObjectRail(event) catch |err| {
+                self.message = @errorName(err);
+            },
             .go => try self.applyGoRail(event),
             .repeat => self.applyKnownRailOrMessage(event, "repeat rail ready"),
             .delete => try self.applyDeleteRail(event),
@@ -1878,6 +1884,18 @@ pub const Client = struct {
         self.applyKnownRailOrMessage(event, "go rail ready");
     }
 
+    fn applySelectObjectRail(self: *Client, event: input.Event) !void {
+        const text = eventText(event) orelse return self.unknownPrefixOrInput("select object");
+        if (text.len == 1) {
+            const range = try self.objectRangeForKey(text[0]);
+            try self.session.selectRange(range.start, range.end);
+            self.mode = .select;
+            self.message = "selected object";
+            return;
+        }
+        self.unknownPrefixOrInput("select object");
+    }
+
     const ParameterDirection = enum { next, previous };
 
     fn moveParameter(self: *Client, direction: ParameterDirection) !void {