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# Copyright 2014-2016 OpenMarket Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import curses
import curses.wrapper
from curses.ascii import isprint
from twisted.internet import reactor
class CursesStdIO:
def __init__(self, stdscr, callback=None):
self.statusText = "Synapse test app -"
self.searchText = ""
self.stdscr = stdscr
self.logLine = ""
self.callback = callback
self._setup()
def _setup(self):
self.stdscr.nodelay(1) # Make non blocking
self.rows, self.cols = self.stdscr.getmaxyx()
self.lines = []
curses.use_default_colors()
self.paintStatus(self.statusText)
self.stdscr.refresh()
def set_callback(self, callback):
self.callback = callback
def fileno(self):
""" We want to select on FD 0 """
return 0
def connectionLost(self, reason):
self.close()
def print_line(self, text):
""" add a line to the internal list of lines"""
self.lines.append(text)
self.redraw()
def print_log(self, text):
self.logLine = text
self.redraw()
def redraw(self):
""" method for redisplaying lines
based on internal list of lines """
self.stdscr.clear()
self.paintStatus(self.statusText)
i = 0
index = len(self.lines) - 1
while i < (self.rows - 3) and index >= 0:
self.stdscr.addstr(self.rows - 3 - i, 0, self.lines[index], curses.A_NORMAL)
i = i + 1
index = index - 1
self.printLogLine(self.logLine)
self.stdscr.refresh()
def paintStatus(self, text):
if len(text) > self.cols:
raise RuntimeError("TextTooLongError")
self.stdscr.addstr(
self.rows - 2, 0, text + " " * (self.cols - len(text)), curses.A_STANDOUT
)
def printLogLine(self, text):
self.stdscr.addstr(
0, 0, text + " " * (self.cols - len(text)), curses.A_STANDOUT
)
def doRead(self):
""" Input is ready! """
curses.noecho()
c = self.stdscr.getch() # read a character
if c == curses.KEY_BACKSPACE:
self.searchText = self.searchText[:-1]
elif c == curses.KEY_ENTER or c == 10:
text = self.searchText
self.searchText = ""
self.print_line(">> %s" % text)
try:
if self.callback:
self.callback.on_line(text)
except Exception as e:
self.print_line(str(e))
self.stdscr.refresh()
elif isprint(c):
if len(self.searchText) == self.cols - 2:
return
self.searchText = self.searchText + chr(c)
self.stdscr.addstr(
self.rows - 1,
0,
self.searchText + (" " * (self.cols - len(self.searchText) - 2)),
)
self.paintStatus(self.statusText + " %d" % len(self.searchText))
self.stdscr.move(self.rows - 1, len(self.searchText))
self.stdscr.refresh()
def logPrefix(self):
return "CursesStdIO"
def close(self):
""" clean up """
curses.nocbreak()
self.stdscr.keypad(0)
curses.echo()
curses.endwin()
class Callback:
def __init__(self, stdio):
self.stdio = stdio
def on_line(self, text):
self.stdio.print_line(text)
def main(stdscr):
screen = CursesStdIO(stdscr) # create Screen object
callback = Callback(screen)
screen.set_callback(callback)
stdscr.refresh()
reactor.addReader(screen)
reactor.run()
screen.close()
if __name__ == "__main__":
curses.wrapper(main)
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