219 lines
8.8 KiB
Python
219 lines
8.8 KiB
Python
#!/bin/python
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# -*- coding: utf-8 -*-
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# Fenrir TTY screen reader
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# By Chrys, Storm Dragon, and contributers.
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import os, struct, sys, pty, tty, termios, shlex, signal, pyte, time, fcntl ,getpass
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from select import select
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from fenrirscreenreader.core import debug
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from fenrirscreenreader.core.eventData import fenrirEventType
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from fenrirscreenreader.core.screenDriver import screenDriver
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from fenrirscreenreader.utils import screen_utils
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class fenrirScreen(pyte.Screen):
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def set_margins(self, *args, **kwargs):
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kwargs.pop("private", None)
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super(fenrirScreen, self).set_margins(*args, **kwargs)
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class Terminal:
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def __init__(self, columns, lines, p_in):
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self.text = ''
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self.attributes = None
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self.screen = fenrirScreen(columns, lines)
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self.screen.write_process_input = \
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lambda data: p_in.write(data.encode())
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self.stream = pyte.ByteStream()
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self.stream.attach(self.screen)
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def feed(self, data):
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self.stream.feed(data)
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def updateAttributes(self, initialize = False):
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buffer = self.screen.buffer
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lines = None
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if not initialize:
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lines = self.screen.dirty
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else:
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lines = range(self.screen.lines)
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self.attributes = [[list(attribute[1:]) + [False, 'default', 'default'] for attribute in line.values()] for line in buffer.values()]
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for y in lines:
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try:
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t = self.attributes[y]
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except:
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self.attributes.append([])
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self.attributes[y] = [list(attribute[1:]) + [False, 'default', 'default'] for attribute in (buffer[y].values())]
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if len(self.attributes[y]) < self.screen.columns:
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diff = self.screen.columns - len(self.attributes[y])
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self.attributes[y] += [['default', 'default', False, False, False, False, False, False, 'default', 'default']] * diff
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def resize(self, lines, columns):
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self.screen.resize(lines, columns)
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self.setCursor()
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self.updateAttributes(True)
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def setCursor(self, x = -1, y = -1):
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xPos = x
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yPos = y
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if xPos == -1:
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xPos = self.screen.cursor.x
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if yPos == -1:
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yPos = self.screen.cursor.y
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self.screen.cursor.x = min(self.screen.cursor.x, self.screen.columns - 1)
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self.screen.cursor.y = min(self.screen.cursor.y, self.screen.lines - 1)
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def GetScreenContent(self):
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cursor = self.screen.cursor
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self.text = '\n'.join(self.screen.display)
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self.updateAttributes(self.attributes == None)
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self.screen.dirty.clear()
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return {"cursor": (cursor.x, cursor.y),
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'lines': self.screen.lines,
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'columns': self.screen.columns,
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"text": self.text,
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'attributes': self.attributes.copy(),
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'screen': 'pty',
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'screenUpdateTime': time.time(),
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}.copy()
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class driver(screenDriver):
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def __init__(self):
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screenDriver.__init__(self)
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self.signalPipe = os.pipe()
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self.p_out = None
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self.terminal = None
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self.p_pid = -1
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signal.signal(signal.SIGWINCH, self.handleSigwinch)
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def initialize(self, environment):
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self.env = environment
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self.command = self.env['runtime']['settingsManager'].getSetting('general','shell')
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self.shortcutType = self.env['runtime']['inputManager'].getShortcutType()
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self.env['runtime']['processManager'].addCustomEventThread(self.terminalEmulation)
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def getCurrScreen(self):
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self.env['screen']['oldTTY'] = 'pty'
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self.env['screen']['newTTY'] = 'pty'
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def injectTextToScreen(self, msgBytes, screen = None):
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if not screen:
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screen = self.p_out.fileno()
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if isinstance(msgBytes, str):
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msgBytes = bytes(msgBytes, 'UTF-8')
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os.write(screen, msgBytes)
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def getSessionInformation(self):
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self.env['screen']['autoIgnoreScreens'] = []
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self.env['general']['prevUser'] = getpass.getuser()
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self.env['general']['currUser'] = getpass.getuser()
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def readAll(self, fd, timeout = 0.3, interruptFd = None, len = 65536):
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msgBytes = b''
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fdList = []
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fdList += [fd]
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if interruptFd:
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fdList += [interruptFd]
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starttime = time.time()
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while True:
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r = screen_utils.hasMoreWhat(fdList, 0.0001)
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# nothing more to read
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if not fd in r:
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break
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data = os.read(fd, len)
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if data == b'':
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raise EOFError
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msgBytes += data
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# exit on interrupt available
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if interruptFd in r:
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break
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# respect timeout but wait a little bit of time to see if something more is here
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if (time.time() - starttime) >= timeout:
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break
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return msgBytes
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def openTerminal(self, columns, lines, command):
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p_pid, master_fd = pty.fork()
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if p_pid == 0: # Child.
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argv = shlex.split(command)
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env = os.environ.copy()
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#values are VT100,xterm-256color,linux
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try:
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if env["TERM"] == '':
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env["TERM"] = 'linux'
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except:
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env["TERM"] = 'linux'
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os.execvpe(argv[0], argv, env)
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# File-like object for I/O with the child process aka command.
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p_out = os.fdopen(master_fd, "w+b", 0)
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return Terminal(columns, lines, p_out), p_pid, p_out
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def resizeTerminal(self,fd):
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s = struct.pack('HHHH', 0, 0, 0, 0)
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s = fcntl.ioctl(0, termios.TIOCGWINSZ, s)
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fcntl.ioctl(fd, termios.TIOCSWINSZ, s)
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lines, columns, _, _ = struct.unpack('hhhh', s)
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return lines, columns
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def getTerminalSize(self, fd):
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s = struct.pack('HHHH', 0, 0, 0, 0)
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lines, columns, _, _ = struct.unpack('HHHH', fcntl.ioctl(fd, termios.TIOCGWINSZ, s))
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return lines, columns
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def handleSigwinch(self, *args):
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os.write(self.signalPipe[1], b'w')
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def terminalEmulation(self,active , eventQueue):
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try:
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old_attr = termios.tcgetattr(sys.stdin)
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tty.setraw(0)
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lines, columns = self.getTerminalSize(0)
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if self.command == '':
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self.command = screen_utils.getShell()
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self.terminal, self.p_pid, self.p_out = self.openTerminal(columns, lines, self.command)
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lines, columns = self.resizeTerminal(self.p_out)
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self.terminal.resize(lines, columns)
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fdList = [sys.stdin, self.p_out, self.signalPipe[0]]
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while active.value:
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r, _, _ = select(fdList, [], [], 1)
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# none
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if r == []:
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continue
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# signals
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if self.signalPipe[0] in r:
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os.read(self.signalPipe[0], 1)
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lines, columns = self.resizeTerminal(self.p_out)
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self.terminal.resize(lines, columns)
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# input
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if sys.stdin in r:
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try:
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msgBytes = self.readAll(sys.stdin.fileno(), len=4096)
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except (EOFError, OSError):
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active.value = False
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break
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if self.shortcutType == 'KEY':
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try:
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self.injectTextToScreen(msgBytes)
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except:
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active.value = False
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break
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else:
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eventQueue.put({"Type":fenrirEventType.ByteInput,
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"Data":msgBytes })
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# output
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if self.p_out in r:
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try:
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msgBytes = self.readAll(self.p_out.fileno(), interruptFd=sys.stdin.fileno())
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except (EOFError, OSError):
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active.value = False
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break
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# feed and send event bevore write, the pyte already has the right state
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# so fenrir already can progress bevore os.write what should give some better reaction time
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self.terminal.feed(msgBytes)
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eventQueue.put({"Type":fenrirEventType.ScreenUpdate,
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"Data":screen_utils.createScreenEventData(self.terminal.GetScreenContent())
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})
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self.injectTextToScreen(msgBytes, screen=sys.stdout.fileno())
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except Exception as e: # Process died?
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print(e)
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active.value = False
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finally:
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os.kill(self.p_pid, signal.SIGTERM)
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self.p_out.close()
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termios.tcsetattr(sys.stdin, termios.TCSADRAIN, old_attr)
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eventQueue.put({"Type":fenrirEventType.StopMainLoop,"Data":None})
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sys.exit(0)
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def getCurrApplication(self):
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pass
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