xrandrl/scripts/xrandrl

#!/usr/bin/env python3
# PYTHON_ARGCOMPLETE_OK

"""
sudo apt-get install libx11-dev libxrandr-dev
https://cgit.freedesktop.org/xorg/app/xrandr/tree/xrandr.c
"""

import ctypes
import sys

Time = ctypes.c_ulong
"""
#ifndef _XTYPEDEF_XID
#  define _XTYPEDEF_XID
#  ifndef _XSERVER64
typedef unsigned long XID;
#  else
typedef CARD32 XID;
#  endif
#endif
"""
XID = ctypes.c_ulong
"""
typedef XID RROutput;
"""
RROutput = XID
"""
typedef XID RRCrtc;
"""
RRCrtc = XID
""" /usr/include/X11/extensions/Xrandr.h
typedef XID RRMode;
"""
RRMode = XID
""" /usr/include/X11/extensions/randr.h
#define RR_Connected		0
"""
RR_Connected = 0
""" /usr/include/X11/extensions/randr.h
typedef unsigned short	Connection;
"""
Connection = ctypes.c_ushort
""" /usr/include/X11/extensions/randr.h
typedef unsigned short	SubpixelOrder;
"""
SubpixelOrder = ctypes.c_ushort

""" /usr/include/X11/extensions/Xrandr.h
typedef struct _XRRScreenResources {
    Time	timestamp;
    Time	configTimestamp;
    int		ncrtc;
    RRCrtc	*crtcs;
    int		noutput;
    RROutput	*outputs;
    int		nmode;
    XRRModeInfo	*modes;
} XRRScreenResources;
"""


class XRRScreenResources(ctypes.Structure):
    _fields_ = [
        ('timestamp', Time),
        ('configTimestamp', Time),
        ('ncrtc', ctypes.c_int),
        ('crtcs', ctypes.POINTER(RRCrtc)),
        ('noutput', ctypes.c_int),
        ('outputs', ctypes.POINTER(RROutput)),
        ('nmode', ctypes.c_int),
        ('modes', ctypes.c_void_p),  # ctypes.POINTER(XRRModeInfo)
    ]

"""
typedef struct _XRROutputInfo {
    Time	    timestamp;
    RRCrtc	    crtc;
    char	    *name;
    int		    nameLen;
    unsigned long   mm_width;
    unsigned long   mm_height;
    Connection	    connection;
    SubpixelOrder   subpixel_order;
    int		    ncrtc;
    RRCrtc	    *crtcs;
    int		    nclone;
    RROutput	    *clones;
    int		    nmode;
    int		    npreferred;
    RRMode	    *modes;
} XRROutputInfo;
"""


class XRROutputInfo(ctypes.Structure):
    _fields_ = [
        ('timestamp', Time),
        ('crtc', RRCrtc),
        ('name', ctypes.c_char_p),
        ('nameLen', ctypes.c_int),
        ('mm_width', ctypes.c_ulong),
        ('mm_height', ctypes.c_ulong),
        ('connection', Connection),
        ('subpixel_order', SubpixelOrder),
        ('ncrtc', ctypes.c_int),
        ('crtcs', ctypes.POINTER(RRCrtc)),
        ('nclone', ctypes.c_int),
        ('clones', ctypes.POINTER(RROutput)),
        ('nmode', ctypes.c_int),
        ('npreferred', ctypes.c_int),
        ('modes', ctypes.POINTER(RRMode)),
    ]

X11 = ctypes.cdll.LoadLibrary("libX11.so")
Xrandr = ctypes.cdll.LoadLibrary("libXrandr.so")
Xrandr.XRRGetScreenResourcesCurrent.restype = ctypes.POINTER(
    XRRScreenResources)
"""
XRROutputInfo *
XRRGetOutputInfo (Display *dpy, XRRScreenResources *resources, RROutput output);
"""
Xrandr.XRRGetOutputInfo.restype = ctypes.POINTER(XRROutputInfo)


def get_xrandr_output_infos(xdisplay):
    screen_resrcs = Xrandr.XRRGetScreenResourcesCurrent(
        xdisplay,
        X11.XDefaultRootWindow(xdisplay),
    )
    assert isinstance(screen_resrcs.contents, XRRScreenResources)
    return [Xrandr.XRRGetOutputInfo(xdisplay, screen_resrcs, screen_resrcs.contents.outputs[o])
            for o in range(screen_resrcs.contents.noutput)]


def process(connected):
    xdisplay = X11.XOpenDisplay(None)
    for output_info in get_xrandr_output_infos(xdisplay):
        if not connected or output_info.contents.connection == RR_Connected:
            output_name = output_info.contents.name \
                .decode(sys.getfilesystemencoding())
            print(output_name)
    X11.XCloseDisplay(xdisplay)


def _init_argparser():
    import argparse
    argparser = argparse.ArgumentParser(description=None)
    argparser.add_argument(
        '--connected',
        action='store_true',
        help='connected only',
    )
    return argparser


def main(argv):
    argparser = _init_argparser()
    try:
        import argcomplete
    except ImportError:
        pass
    args = argparser.parse_args(argv)
    process(**vars(args))
    return 0

if __name__ == "__main__":
    sys.exit(main(sys.argv[1:]))