feat: add goto_offset mini mode and command

src/tui/mode/mini/goto_offset.zig

@@ -0,0 +1,58 @@
+const fmt = @import("std").fmt;
+const command = @import("command");
+
+const tui = @import("../../tui.zig");
+const Cursor = @import("../../editor.zig").Cursor;
+
+pub const Type = @import("numeric_input.zig").Create(@This());
+pub const create = Type.create;
+
+pub const ValueType = struct {
+    cursor: Cursor = .{},
+    offset: usize = 0,
+};
+
+pub fn name(_: *Type) []const u8 {
+    return "＃goto byte";
+}
+
+pub fn start(_: *Type) ValueType {
+    const editor = tui.get_active_editor() orelse return .{};
+    return .{ .cursor = editor.get_primary().cursor };
+}
+
+pub fn process_digit(self: *Type, digit: u8) void {
+    switch (digit) {
+        0...9 => {
+            if (self.input) |*input| {
+                input.offset = input.offset * 10 + digit;
+            } else {
+                self.input = .{ .offset = digit };
+            }
+        },
+        else => unreachable,
+    }
+}
+
+pub fn delete(self: *Type, input: *ValueType) void {
+    const newval = if (input.offset < 10) 0 else input.offset / 10;
+    if (newval == 0) self.input = null else input.offset = newval;
+}
+
+pub fn format_value(_: *Type, input_: ?ValueType, buf: []u8) []const u8 {
+    return if (input_) |input|
+        fmt.bufPrint(buf, "{d}", .{input.offset}) catch ""
+    else
+        "";
+}
+
+pub const preview = goto;
+pub const apply = goto;
+pub const cancel = goto;
+
+fn goto(self: *Type, _: command.Context) void {
+    if (self.input) |input|
+        command.executeName("goto_byte_offset", command.fmt(.{input.offset})) catch {}
+    else
+        command.executeName("goto_line_and_column", command.fmt(.{ self.start.cursor.row, self.start.cursor.col })) catch {};
+}

src/tui/tui.zig

@@ -1038,6 +1038,11 @@ const cmds = struct {
     }
     pub const goto_meta: Meta = .{ .description = "Goto line" };
 
+    pub fn goto_offset(self: *Self, ctx: Ctx) Result {
+        return enter_mini_mode(self, @import("mode/mini/goto_offset.zig"), ctx);
+    }
+    pub const goto_offset_meta: Meta = .{ .description = "Goto byte offset" };
+
     pub fn move_to_char(self: *Self, ctx: Ctx) Result {
         return enter_mini_mode(self, @import("mode/mini/move_to_char.zig"), ctx);
     }