feat(buffers): add buffer switcher

src/tui/mode/overlay/buffer_palette.zig

@@ -0,0 +1,44 @@
+const std = @import("std");
+const cbor = @import("cbor");
+const tp = @import("thespian");
+const root = @import("root");
+const command = @import("command");
+
+const tui = @import("../../tui.zig");
+pub const Type = @import("palette.zig").Create(@This());
+
+pub const label = "Switch buffers";
+pub const name = " buffer";
+pub const description = "buffer";
+
+pub const Entry = struct {
+    label: []const u8,
+};
+
+pub fn load_entries(palette: *Type) !usize {
+    const buffer_manager = tui.get_buffer_manager() orelse return 0;
+    const buffers = try buffer_manager.list_most_recently_used(palette.allocator);
+    defer palette.allocator.free(buffers);
+    for (buffers) |buffer|
+        (try palette.entries.addOne()).* = .{ .label = buffer.file_path };
+    return if (palette.entries.items.len == 0) label.len else 0;
+}
+
+pub fn add_menu_entry(palette: *Type, entry: *Entry, matches: ?[]const usize) !void {
+    var value = std.ArrayList(u8).init(palette.allocator);
+    defer value.deinit();
+    const writer = value.writer();
+    try cbor.writeValue(writer, entry.label);
+    try cbor.writeValue(writer, matches orelse &[_]usize{});
+    try palette.menu.add_item_with_handler(value.items, select);
+    palette.items += 1;
+}
+
+fn select(menu: **Type.MenuState, button: *Type.ButtonState) void {
+    var file_path: []const u8 = undefined;
+    var iter = button.opts.label;
+    if (!(cbor.matchString(&iter, &file_path) catch false)) return;
+    tp.self_pid().send(.{ "cmd", "exit_overlay_mode" }) catch |e| menu.*.opts.ctx.logger.err("navigate", e);
+    tp.self_pid().send(.{ "cmd", "navigate", .{} }) catch |e| menu.*.opts.ctx.logger.err("navigate", e);
+    tp.self_pid().send(.{ "cmd", "navigate", .{ .file = file_path } }) catch |e| menu.*.opts.ctx.logger.err("navigate", e);
+}