#! /usr/local/bin/python
#
# Send a remote control command to Grail.
#
# Example:
#
# You can use this script with Emacs so that clicking on a URL causes
# Grail to load the page instead of W3 or Netscape.  I use this stuff
# in XEmacs 19.13; YMMV if you use a different version.
#
# For VM, use:
# (setq vm-url-browser "~/.grail/user/rcgrail.py")
#
# For GNUS use:
# (defun baw:send-url-to-grail (url)
#   (message "Sending URL to Grail...")
#   (save-excursion
#     (set-buffer (get-buffer-create "*Shell Command Output*"))
#     (erase-buffer)
#     ;; don't worry about this failing...
#     (call-process "~/.grail/user/rcgrail.py" nil 0 nil url)
#     (message "Sending URL to Grail... done")))
#
# (setq gnus-button-url 'baw:send-url-to-grail ; GNUS 5
#       highlight-headers-follow-url-function 'baw:send-url-to-grail) ; GNUS 4


import sys
import getopt
import socket
import tempfile
import os


# The file structure.  Modeled after X11
RCDIR = '.grail-unix'
GRAILCMD = 'grail'

try:
    FILENAME = os.environ['GRAIL_REMOTE']
except KeyError:
    FILENAME = ''
GRAIL_CMD = '/bin/sh'
GRAIL_ARGS = ('-c', GRAILCMD)

def rc_filename(user=None, display=None):
    tmpdir = tempfile.gettempdir()
    user = os.environ['USER'] or os.environ['LOGNAME']
    if not display:
	display = os.environ['DISPLAY'] or ':0'
    sfile = '%s-%s' % (user, display)
    return os.path.join(tmpdir, os.path.join(RCDIR, sfile))

def usage(progname):
    print 'Usage:', progname, '[-b] [-d display] [-h] URI'
    print '    -b fires up a new browser window'
    print '    -d send URI to Grail on display'
    print '    -h prints this message'
    print '    URI is the URI string to tell Grail to load'



def main():
    progname = sys.argv[0]
    filename = FILENAME
    #
    # if I have it, try :0.1 first, then :0
    # yeah, this is pretty damn Solaris specific!
    #
    display = None
    if os.path.exists('/dev/fb1'):
	display = ':0.1'
    if not filename:
	filename = rc_filename(display=display)
    cmd = 'LOAD'
    try:
	optlist, args = getopt.getopt(sys.argv[1:], 'bdh')
	if not args:
	    raise getopt.error
	else:
	    uri = args[0]
	for switch, arg in optlist:
	    if switch == '-b' and cmd[-3:] <> 'NEW':
		cmd = cmd + 'NEW'
	    elif switch == '-d':
		display = arg
		filename = rc_filename(display=display)
	    elif switch == '-h':
		usage(progname)
		sys.exit(0)
	    else:
		raise getopt.error
    except getopt.error:
	usage(progname)
	sys.exit(-1)
    if not os.path.exists(filename):
	# No Grail started yet, try starting it up...
	if os.fork() == 0:
	    os.environ['DISPLAY'] = display or ':0'
	    os.execvpe(GRAIL_CMD, GRAIL_ARGS + (uri,), os.environ)
	else:
	    sys.exit(0)
    # calculate the command
    cmd = cmd + ' ' + uri
    # now do the remote connection and command
    s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
    s.connect(filename)
    s.send(cmd)
    s.close()

main()