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# -*- coding: utf-8 -*-
#
# File: portato/gui/qt/terminal.py
# This file is part of the Portato-Project, a graphical portage-frontend.
#
# Copyright (C) 2007 René 'Necoro' Neumann
# This is free software. You may redistribute copies of it under the terms of
# the GNU General Public License version 2.
# There is NO WARRANTY, to the extent permitted by law.
#
# Written by René 'Necoro' Neumann <necoro@necoro.net>
from PyQt4 import Qt
from threading import Thread, Lock
from os import read
from portato.gui.wrapper import Console
from portato.helper import debug
class BoldFormat (Qt.QTextCharFormat):
def __init__(self):
Qt.QTextCharFormat.__init__(self)
self.setFontWeight(Qt.QFont.Bold)
class UnderlineFormat (Qt.QTextCharFormat):
def __init__(self):
Qt.QTextCharFormat.__init__(self)
self.setFontUnderline(True)
class ColorFormat (Qt.QTextCharFormat):
def __init__(self, color):
Qt.QTextCharFormat.__init__(self)
self.setForeground(Qt.QBrush(Qt.QColor(color)))
# we only support a subset of the commands
esc_seq = ("\x1b", "[")
reset_seq = "39;49;00"
seq_end = "m"
seq_sep = ";"
backspace = 8
title_seq = ("\x1b", "]")
title_end = "\x07"
# the attributes
attr = {}
attr[0] = None # normal
attr[1] = BoldFormat() # bold
attr[4] = UnderlineFormat() # underline
attr[30] = ColorFormat("black")
attr[31] = ColorFormat("red")
attr[32] = ColorFormat("green")
attr[33] = ColorFormat("yellow")
attr[34] = ColorFormat("blue")
attr[35] = ColorFormat("magenta")
attr[36] = ColorFormat("cyan")
attr[37] = ColorFormat("white")
attr[39] = None # default
class QtConsole (Console, Qt.QTextEdit):
"""Self implemented emulation of a terminal emulation.
This only supports a subset of instructions known to normal terminals."""
def __init__ (self, parent):
"""Constructor.
@param parent: parent widget
@type parent: Qt.QWidget"""
Qt.QTextEdit.__init__(self, parent)
self.pty = None
self.running = False
self.stdFormat = self.currentCharFormat()
self.formatQueue = []
self.formatLock = Lock()
self.title = None
self.setReadOnly(True)
# we need these two signals, as threads are not allowed to access the GUI
# solution: thread sends signal, which is handled by the main loop
Qt.QObject.connect(self, Qt.SIGNAL("doSomeWriting"), self._write)
Qt.QObject.connect(self, Qt.SIGNAL("deletePrevChar()"), self._deletePrev)
def _deletePrev (self):
"""Deletes the previous character."""
self.textCursor().deletePreviousChar()
def _write (self, text):
"""Writes some text. A text of "\\x1b" signals _write() to reload
the current char format.
@param text: the text to print
@type text: string"""
if text == esc_seq[0]: # \x1b -> reload format
self.setCurrentCharFormat(self.get_format())
else:
if not self.textCursor().atEnd(): # move cursor and re-set format
f = self.currentCharFormat()
self.moveCursor(Qt.QTextCursor.End)
self.setCurrentCharFormat(f)
# insert the text
self.textCursor().insertText(text)
# scroll down if needed
self.ensureCursorVisible()
def write(self, text):
"""Convenience function for emitting the writing signal."""
self.emit(Qt.SIGNAL("doSomeWriting"), text)
def start_new_thread (self):
"""Starts a new thread, which will listen for some input.
@see: QtTerminal.__run()"""
self.run = True
self.current = Thread(target=self.__run, name="QtTerminal Listener")
self.current.setDaemon(True) # close application even if this thread is running
self.current.start()
def set_pty (self, pty):
if not self.running:
self.pty = pty
self.start_new_thread()
self.running = True
else: # quit current thread
self.run = False
self.clear()
self.pty = pty # set this after clearing to lose no chars :)
self.start_new_thread()
def __run (self):
"""This function is mainly a loop, which looks for some new input at the terminal,
and parses it for text attributes."""
while self.run:
s = read(self.pty, 1)
if s == "": break # nothing read -> finish
if ord(s) == backspace: # BS
self.emit(Qt.SIGNAL("deletePrevChar()"))
continue
if s == esc_seq[0]: # -> 0x27
s = read(self.pty, 1)
if s == esc_seq[1]: # -> [
while True:
_s = read(self.pty, 1)
s += _s
if _s == seq_end: break
self.parse_seq(s[1:-1])
continue
elif s == title_seq[1]: # -> ]
while True:
_s = read(self.pty, 1)
s += _s
if _s == title_end: break
self.parse_title(s[1:-1])
continue
else:
self.write(esc_seq[0]+s)
if s == "\r": continue
self.write(s)
def parse_seq (self, seq):
"""Parses a sequence of bytes.
If a new attribute has been encountered, a new format is created and added
to the internal format queue.
@param seq: sequence to parse
@type seq: string"""
global attr # the dict of attributes
format = self.virgin_format()
if seq != reset_seq: # resettet -> done
seq = seq.split(seq_sep)
for s in seq:
try:
s = int(s)
except ValueError:
format = self.virgin_format()
break
try:
if attr[s] is not None:
format.merge(attr[s])
else:
format = self.virgin_format()
break
except KeyError: # no such attribute
format = self.virgin_format()
break
self.add_format(format)
self.write(esc_seq[0]) # write \x1b to signal the occurence of a new format
def parse_title (self, seq):
if not seq.startswith("0;"):
return
self.title = seq[2:]
def get_window_title (self):
return self.title
def add_format (self, format):
"""Adds a format to the queue.
We have to take a queue, because the write-signals might occur asynchronus,
so we set a format for the wrong characters.
@param format: the format to add
@type format: Qt.QTextCharFormat"""
self.formatLock.acquire()
self.formatQueue.append(format)
self.formatLock.release()
def get_format (self):
"""Returns a format from the queue.
We have to take a queue, because the write-signals might occur asynchronus,
so we set a format for the wrong characters.
@returns: the popped format
@rtype: Qt.QTextCharFormat"""
self.formatLock.acquire()
f = self.formatQueue.pop(0)
self.formatLock.release()
return f
def virgin_format (self):
"""The normal standard format. It is necessary to create it as a new one for some
dubious reasons ... only Qt.QGod knows why."""
return Qt.QTextCharFormat(self.stdFormat)
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