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# Copyright (C) 2015 James E. Blair <corvus@gnu.org>
#
# 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 <http://www.gnu.org/licenses/>.
import argparse
import os
import sys
import time
import urwid
import slide
import server
import rst
import palette
class Presenter(object):
def __init__(self, palette):
blank = urwid.Text(u'')
self.blank = slide.UrwidSlide('Blank', None, blank,
palette['_default'])
self.current = self.blank
self.program = []
self.palette = palette
self.pos = -1
self.loop = urwid.MainLoop(self.blank,
unhandled_input=self.unhandledInput)
self.loop.screen.set_terminal_properties(colors=256)
self.server_pipe_in = self.loop.watch_pipe(self.serverData)
r,w = os.pipe()
self.server_pipe_out_read = os.fdopen(r)
self.server_pipe_out_write = w
self.server = server.ConsoleServer(self)
self.server.start()
def serverData(self, data):
parts = data.split()
if parts[0] == 'jump':
try:
index = int(parts[1])
except Exception:
os.write(self.server_pipe_out_write, 'err\n')
return
if index < 0 or index > len(self.program)-1:
os.write(self.server_pipe_out_write, 'err\n')
return
self.transitionTo(index)
os.write(self.server_pipe_out_write, 'ok\n')
elif parts[0] == 'next':
self.nextSlide()
os.write(self.server_pipe_out_write, 'ok\n')
elif parts[0] == 'prev':
self.prevSlide()
os.write(self.server_pipe_out_write, 'ok\n')
def setProgram(self, program):
self.program = program
def run(self):
self.loop.set_alarm_in(0, self.nextSlide)
self.loop.run()
def unhandledInput(self, key):
if key in ('right', 'page down'):
self.nextSlide()
elif key in ('left', 'page up'):
self.prevSlide()
elif key == 'q':
raise urwid.ExitMainLoop()
def transitionTo(self, index, forward=True):
self.pos = index
current_slide = self.current
new_slide = self.program[index]
if forward:
transition = new_slide.transition
new_slide.resetProgressive()
else:
transition = current_slide.transition
new_slide.resetProgressive(True)
current_slide.stopAnimation()
if forward:
transition.setTargets(current_slide, new_slide)
else:
transition.setTargets(new_slide, current_slide)
self.loop.widget = transition
duration = transition.getDuration()
start = time.time()
now = start
end = start + duration
while duration:
if forward:
progress = min(1-((end-now)/duration), 1.0)
else:
progress = max(((end-now)/duration), 0.0)
transition.setProgress(progress)
self.loop.draw_screen()
now = time.time()
if now >= end:
break
end = time.time()
self.loop.widget = new_slide
self.current = new_slide
self.loop.draw_screen()
current_slide.resetAnimation()
new_slide.startAnimation(self.loop)
def nextSlide(self, loop=None, data=None):
if self.current.nextProgressive():
return
if self.pos+1 == len(self.program):
return
self.transitionTo(self.pos+1)
def prevSlide(self, loop=None, data=None):
if self.current.prevProgressive():
return
if self.pos == 0:
return
self.transitionTo(self.pos-1, forward=False)
def main():
parser = argparse.ArgumentParser(
description='Console-based presentation system')
parser.add_argument('--light', dest='light',
default=False,
action='store_true',
help='use a black on white palette')
parser.add_argument('--warnings', dest='warnings',
default=False,
action='store_true',
help='print RST parser warnings and exit if any')
parser.add_argument('file',
help='presentation file (RST)')
args = parser.parse_args()
if args.light:
plt = palette.LIGHT_PALETTE
else:
plt = palette.DARK_PALETTE
hinter = slide.ScreenHinter()
parser = rst.PresentationParser(plt, hinter)
program = parser.parse(unicode(open(args.file).read(), 'utf-8'), args.file)
if args.warnings:
w = parser.warnings.getvalue()
if w:
print w
sys.exit(1)
p = Presenter(plt)
p.setProgram(program)
hinter.setScreen(p.loop.screen)
p.run()
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