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// 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 Orientation = enum {
left,
right,
top,
bottom,
};
/// This is an implementation of the default "tiled" layout of dwm and the
/// 3 other orientations thereof. This code is written with the left
/// orientation in mind and then the input/output values are adjusted to apply
/// the necessary transformations to derive the other 3.
///
/// With 4 views and one main view, the left layout looks something like this:
///
/// +-----------------------+------------+
/// | | |
/// | | |
/// | | |
/// | +------------+
/// | | |
/// | | |
/// | | |
/// | +------------+
/// | | |
/// | | |
/// | | |
/// +-----------------------+------------+
pub fn main() !void {
const args = std.os.argv;
if (args.len != 7) printUsageAndExit();
// first arg must be left, right, top, or bottom
const main_location = std.meta.stringToEnum(Orientation, std.mem.spanZ(args[1])) orelse
printUsageAndExit();
// the other 5 are passed by river and described in river-layouts(7)
const num_views = try std.fmt.parseInt(u32, std.mem.spanZ(args[2]), 10);
const main_count = try std.fmt.parseInt(u32, std.mem.spanZ(args[3]), 10);
const main_factor = try std.fmt.parseFloat(f64, std.mem.spanZ(args[4]));
const width_arg: u32 = switch (main_location) {
.left, .right => 5,
.top, .bottom => 6,
};
const height_arg: u32 = if (width_arg == 5) 6 else 5;
const output_width = try std.fmt.parseInt(u32, std.mem.spanZ(args[width_arg]), 10);
const output_height = try std.fmt.parseInt(u32, std.mem.spanZ(args[height_arg]), 10);
const secondary_count = if (num_views > main_count) num_views - main_count else 0;
// to make things pixel-perfect, we make the first main and first secondary
// view slightly larger if the height is not evenly divisible
var main_width: u32 = undefined;
var main_height: u32 = undefined;
var main_height_rem: u32 = undefined;
var secondary_width: u32 = undefined;
var secondary_height: u32 = undefined;
var secondary_height_rem: u32 = undefined;
if (main_count > 0 and secondary_count > 0) {
main_width = @floatToInt(u32, main_factor * @intToFloat(f64, output_width));
main_height = output_height / main_count;
main_height_rem = output_height % main_count;
secondary_width = output_width - main_width;
secondary_height = output_height / secondary_count;
secondary_height_rem = output_height % secondary_count;
} else if (main_count > 0) {
main_width = output_width;
main_height = output_height / main_count;
main_height_rem = output_height % main_count;
} else if (secondary_width > 0) {
main_width = 0;
secondary_width = output_width;
secondary_height = output_height / secondary_count;
secondary_height_rem = output_height % secondary_count;
}
// Buffering the output makes things faster
var stdout_buf = std.io.bufferedOutStream(std.io.getStdOut().outStream());
const stdout = stdout_buf.outStream();
var i: u32 = 0;
while (i < num_views) : (i += 1) {
var x: u32 = undefined;
var y: u32 = undefined;
var width: u32 = undefined;
var height: u32 = undefined;
if (i < main_count) {
x = 0;
y = i * main_height + if (i > 0) main_height_rem else 0;
width = main_width;
height = main_height + if (i == 0) main_height_rem else 0;
} else {
x = main_width;
y = (i - main_count) * secondary_height + if (i > main_count) secondary_height_rem else 0;
width = secondary_width;
height = secondary_height + if (i == main_count) secondary_height_rem else 0;
}
switch (main_location) {
.left => try stdout.print("{} {} {} {}\n", .{ x, y, width, height }),
.right => try stdout.print("{} {} {} {}\n", .{ output_width - x - width, y, width, height }),
.top => try stdout.print("{} {} {} {}\n", .{ y, x, height, width }),
.bottom => try stdout.print("{} {} {} {}\n", .{ y, output_width - x - width, height, width }),
}
}
try stdout_buf.flush();
}
fn printUsageAndExit() noreturn {
const usage: []const u8 =
\\Usage: rivertile left|right|top|bottom [args passed by river]
\\
;
std.debug.warn(usage, .{});
std.os.exit(1);
}
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