mswitch/source/modules/monitors.d

module modules.monitors;

import std.conv;
import std.string;

extern (C)
{
    enum Relation
    {
        left_of,
        right_of,
        above,
        below,
        same_as,
    }

    struct x_change
    {
        immutable(char)* first_monitor;
        immutable(char)* second_monitor;
        int is_position;
        Relation position;
        int primary;
    }

    struct x_monitor
    {
        char[10] name = "\0";
        int width;
        int height;
        int primary;
    }

    struct x_info
    {
        int count;
        x_monitor[5] monitor;
    }

    int XInfo(x_info* info);
    int XChange(x_change* settings);
}

struct Monitor
{
    string name;
    bool primary;
    int width;
    int height;
}

Monitor[] getMonitorsInfo()
{
    Monitor[] m;

    x_info monitors;
    if (!XInfo(&monitors))
    {
        foreach (i; 0 .. monitors.count)
        {
            Monitor current;
            current.name = fromStringz(monitors.monitor[i].name.idup);
            current.primary = to!bool(monitors.monitor[i].primary);
            current.width = monitors.monitor[i].width;
            current.height = monitors.monitor[i].height;

            m ~= current;
        }
    }

    return m;
}

bool setPrimaryMonitor(string monitor)
{
    x_change settings;

    settings.first_monitor = toStringz(monitor);
    settings.primary = 1;
    settings.is_position = 0;

    return to!bool(XChange(&settings));
}

bool swapMonitors(string first, string second, Relation position)
{
    x_change settings;

    settings.first_monitor = toStringz(first);
    settings.second_monitor = toStringz(second);
    settings.is_position = 1;
    settings.position = position;
    settings.primary = 0;

    return to!bool(XChange(&settings));
}