From 3f06f6b19c53d3f1580fbcc1291e14190c1578cd Mon Sep 17 00:00:00 2001
From: CJ van den Berg <cj@vdbonline.com>
Date: Tue, 21 Jan 2025 22:29:39 +0100
Subject: [PATCH] feat(buffers): add buffer switcher

---
 src/buffer/Manager.zig                  |  8 ++---
 src/keybind/builtin/flow.json           |  2 ++
 src/tui/mode/overlay/buffer_palette.zig | 44 +++++++++++++++++++++++++
 src/tui/tui.zig                         |  5 +++
 4 files changed, 55 insertions(+), 4 deletions(-)
 create mode 100644 src/tui/mode/overlay/buffer_palette.zig

diff --git a/src/buffer/Manager.zig b/src/buffer/Manager.zig
index 26a1448..6b68e78 100644
--- a/src/buffer/Manager.zig
+++ b/src/buffer/Manager.zig
@@ -51,15 +51,15 @@ pub fn retire(_: *Self, buffer: *Buffer) void {
     buffer.update_last_used_time();
 }
 
-pub fn list(self: *Self, allocator: std.mem.Allocator) error{OutOfMemory}![]*const Buffer {
-    var buffers: std.ArrayListUnmanaged([]*const Buffer) = .{};
+pub fn list_most_recently_used(self: *Self, allocator: std.mem.Allocator) error{OutOfMemory}![]*Buffer {
+    var buffers: std.ArrayListUnmanaged(*Buffer) = .{};
     var i = self.buffers.iterator();
     while (i.next()) |kv|
-        (try buffers.addOne()).* = kv.value_ptr.*;
+        (try buffers.addOne(allocator)).* = kv.value_ptr.*;
 
     std.mem.sort(*Buffer, buffers.items, {}, struct {
         fn less_fn(_: void, lhs: *Buffer, rhs: *Buffer) bool {
-            return lhs.mtime > rhs.mtime;
+            return lhs.utime > rhs.utime;
         }
     }.less_fn);
 
diff --git a/src/keybind/builtin/flow.json b/src/keybind/builtin/flow.json
index 33c5ec9..6876aee 100644
--- a/src/keybind/builtin/flow.json
+++ b/src/keybind/builtin/flow.json
@@ -1,6 +1,7 @@
 {
     "project": {
         "press": [
+            ["ctrl+shift+e", "switch_buffers"],
             ["ctrl+0", "reset_fontsize"],
             ["ctrl+plus", "adjust_fontsize", 1.0],
             ["ctrl+minus", "adjust_fontsize", -1.0],
@@ -250,6 +251,7 @@
             ["ctrl+p", "palette_menu_up"],
             ["ctrl+n", "palette_menu_down"],
             ["ctrl+e", "palette_menu_down"],
+            ["ctrl+shift+e", "palette_menu_down"],
             ["ctrl+r", "palette_menu_down"],
             ["ctrl+t", "palette_menu_down"],
             ["ctrl+v", "system_paste"],
diff --git a/src/tui/mode/overlay/buffer_palette.zig b/src/tui/mode/overlay/buffer_palette.zig
new file mode 100644
index 0000000..a8cff8e
--- /dev/null
+++ b/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);
+}
diff --git a/src/tui/tui.zig b/src/tui/tui.zig
index 2b1d28c..fc385ea 100644
--- a/src/tui/tui.zig
+++ b/src/tui/tui.zig
@@ -815,6 +815,11 @@ const cmds = struct {
     }
     pub const open_recent_project_meta = .{ .description = "Open recent project" };
 
+    pub fn switch_buffers(self: *Self, _: Ctx) Result {
+        return self.enter_overlay_mode(@import("mode/overlay/buffer_palette.zig").Type);
+    }
+    pub const switch_buffers_meta = .{ .description = "Switch buffers" };
+
     pub fn change_theme(self: *Self, _: Ctx) Result {
         return self.enter_overlay_mode(@import("mode/overlay/theme_palette.zig").Type);
     }