river/river/command/enter_mode.zig

// This file is part of river, a dynamic tiling wayland compositor.
//
// Copyright 2020 The River Developers
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.

const std = @import("std");

const Error = @import("../command.zig").Error;
const Seat = @import("../Seat.zig");

/// Switch to the given mode
pub fn enterMode(
    allocator: *std.mem.Allocator,
    seat: *Seat,
    args: []const []const u8,
    out: *?[]const u8,
) Error!void {
    if (args.len < 2) return Error.NotEnoughArguments;
    if (args.len > 2) return Error.TooManyArguments;

    if (seat.mode_id == 1) {
        out.* = try std.fmt.allocPrint(
            allocator,
            "manually exiting mode 'locked' is not allowed",
            .{},
        );
        return Error.Other;
    }

    const config = seat.input_manager.server.config;
    const target_mode = args[1];
    const mode_id = config.mode_to_id.get(target_mode) orelse {
        out.* = try std.fmt.allocPrint(
            allocator,
            "cannot enter non-existant mode '{}'",
            .{target_mode},
        );
        return Error.Other;
    };

    if (mode_id == 1) {
        out.* = try std.fmt.allocPrint(
            allocator,
            "manually entering mode 'locked' is not allowed",
            .{},
        );
        return Error.Other;
    }

    seat.mode_id = mode_id;
}