330 lines
11 KiB
Python
330 lines
11 KiB
Python
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# -*- test-case-name: twisted.conch.test.test_recvline -*-
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# Copyright (c) Twisted Matrix Laboratories.
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# See LICENSE for details.
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"""
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Basic line editing support.
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@author: Jp Calderone
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"""
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import string
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from zope.interface import implements
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from twisted.conch.insults import insults, helper
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from twisted.python import log, reflect
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_counters = {}
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class Logging(object):
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"""Wrapper which logs attribute lookups.
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This was useful in debugging something, I guess. I forget what.
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It can probably be deleted or moved somewhere more appropriate.
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Nothing special going on here, really.
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"""
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def __init__(self, original):
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self.original = original
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key = reflect.qual(original.__class__)
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count = _counters.get(key, 0)
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_counters[key] = count + 1
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self._logFile = file(key + '-' + str(count), 'w')
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def __str__(self):
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return str(super(Logging, self).__getattribute__('original'))
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def __repr__(self):
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return repr(super(Logging, self).__getattribute__('original'))
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def __getattribute__(self, name):
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original = super(Logging, self).__getattribute__('original')
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logFile = super(Logging, self).__getattribute__('_logFile')
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logFile.write(name + '\n')
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return getattr(original, name)
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class TransportSequence(object):
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"""An L{ITerminalTransport} implementation which forwards calls to
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one or more other L{ITerminalTransport}s.
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This is a cheap way for servers to keep track of the state they
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expect the client to see, since all terminal manipulations can be
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send to the real client and to a terminal emulator that lives in
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the server process.
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"""
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implements(insults.ITerminalTransport)
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for keyID in ('UP_ARROW', 'DOWN_ARROW', 'RIGHT_ARROW', 'LEFT_ARROW',
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'HOME', 'INSERT', 'DELETE', 'END', 'PGUP', 'PGDN',
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'F1', 'F2', 'F3', 'F4', 'F5', 'F6', 'F7', 'F8', 'F9',
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'F10', 'F11', 'F12'):
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exec '%s = object()' % (keyID,)
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TAB = '\t'
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BACKSPACE = '\x7f'
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def __init__(self, *transports):
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assert transports, "Cannot construct a TransportSequence with no transports"
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self.transports = transports
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for method in insults.ITerminalTransport:
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exec """\
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def %s(self, *a, **kw):
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for tpt in self.transports:
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result = tpt.%s(*a, **kw)
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return result
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""" % (method, method)
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class LocalTerminalBufferMixin(object):
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"""A mixin for RecvLine subclasses which records the state of the terminal.
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This is accomplished by performing all L{ITerminalTransport} operations on both
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the transport passed to makeConnection and an instance of helper.TerminalBuffer.
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@ivar terminalCopy: A L{helper.TerminalBuffer} instance which efforts
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will be made to keep up to date with the actual terminal
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associated with this protocol instance.
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"""
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def makeConnection(self, transport):
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self.terminalCopy = helper.TerminalBuffer()
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self.terminalCopy.connectionMade()
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return super(LocalTerminalBufferMixin, self).makeConnection(
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TransportSequence(transport, self.terminalCopy))
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def __str__(self):
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return str(self.terminalCopy)
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class RecvLine(insults.TerminalProtocol):
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"""L{TerminalProtocol} which adds line editing features.
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Clients will be prompted for lines of input with all the usual
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features: character echoing, left and right arrow support for
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moving the cursor to different areas of the line buffer, backspace
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and delete for removing characters, and insert for toggling
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between typeover and insert mode. Tabs will be expanded to enough
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spaces to move the cursor to the next tabstop (every four
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characters by default). Enter causes the line buffer to be
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cleared and the line to be passed to the lineReceived() method
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which, by default, does nothing. Subclasses are responsible for
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redrawing the input prompt (this will probably change).
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"""
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width = 80
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height = 24
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TABSTOP = 4
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ps = ('>>> ', '... ')
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pn = 0
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_printableChars = set(string.printable)
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def connectionMade(self):
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# A list containing the characters making up the current line
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self.lineBuffer = []
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# A zero-based (wtf else?) index into self.lineBuffer.
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# Indicates the current cursor position.
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self.lineBufferIndex = 0
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t = self.terminal
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# A map of keyIDs to bound instance methods.
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self.keyHandlers = {
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t.LEFT_ARROW: self.handle_LEFT,
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t.RIGHT_ARROW: self.handle_RIGHT,
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t.TAB: self.handle_TAB,
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# Both of these should not be necessary, but figuring out
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# which is necessary is a huge hassle.
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'\r': self.handle_RETURN,
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'\n': self.handle_RETURN,
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t.BACKSPACE: self.handle_BACKSPACE,
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t.DELETE: self.handle_DELETE,
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t.INSERT: self.handle_INSERT,
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t.HOME: self.handle_HOME,
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t.END: self.handle_END}
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self.initializeScreen()
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def initializeScreen(self):
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# Hmm, state sucks. Oh well.
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# For now we will just take over the whole terminal.
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self.terminal.reset()
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self.terminal.write(self.ps[self.pn])
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# XXX Note: I would prefer to default to starting in insert
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# mode, however this does not seem to actually work! I do not
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# know why. This is probably of interest to implementors
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# subclassing RecvLine.
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# XXX XXX Note: But the unit tests all expect the initial mode
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# to be insert right now. Fuck, there needs to be a way to
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# query the current mode or something.
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# self.setTypeoverMode()
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self.setInsertMode()
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def currentLineBuffer(self):
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s = ''.join(self.lineBuffer)
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return s[:self.lineBufferIndex], s[self.lineBufferIndex:]
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def setInsertMode(self):
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self.mode = 'insert'
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self.terminal.setModes([insults.modes.IRM])
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def setTypeoverMode(self):
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self.mode = 'typeover'
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self.terminal.resetModes([insults.modes.IRM])
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def drawInputLine(self):
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"""
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Write a line containing the current input prompt and the current line
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buffer at the current cursor position.
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"""
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self.terminal.write(self.ps[self.pn] + ''.join(self.lineBuffer))
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def terminalSize(self, width, height):
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# XXX - Clear the previous input line, redraw it at the new
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# cursor position
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self.terminal.eraseDisplay()
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self.terminal.cursorHome()
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self.width = width
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self.height = height
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self.drawInputLine()
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def unhandledControlSequence(self, seq):
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pass
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def keystrokeReceived(self, keyID, modifier):
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m = self.keyHandlers.get(keyID)
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if m is not None:
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m()
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elif keyID in self._printableChars:
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self.characterReceived(keyID, False)
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else:
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log.msg("Received unhandled keyID: %r" % (keyID,))
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def characterReceived(self, ch, moreCharactersComing):
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if self.mode == 'insert':
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self.lineBuffer.insert(self.lineBufferIndex, ch)
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else:
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self.lineBuffer[self.lineBufferIndex:self.lineBufferIndex+1] = [ch]
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self.lineBufferIndex += 1
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self.terminal.write(ch)
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def handle_TAB(self):
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n = self.TABSTOP - (len(self.lineBuffer) % self.TABSTOP)
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self.terminal.cursorForward(n)
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self.lineBufferIndex += n
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self.lineBuffer.extend(' ' * n)
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def handle_LEFT(self):
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if self.lineBufferIndex > 0:
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self.lineBufferIndex -= 1
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self.terminal.cursorBackward()
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def handle_RIGHT(self):
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if self.lineBufferIndex < len(self.lineBuffer):
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self.lineBufferIndex += 1
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self.terminal.cursorForward()
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def handle_HOME(self):
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if self.lineBufferIndex:
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self.terminal.cursorBackward(self.lineBufferIndex)
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self.lineBufferIndex = 0
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def handle_END(self):
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offset = len(self.lineBuffer) - self.lineBufferIndex
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if offset:
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self.terminal.cursorForward(offset)
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self.lineBufferIndex = len(self.lineBuffer)
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def handle_BACKSPACE(self):
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if self.lineBufferIndex > 0:
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self.lineBufferIndex -= 1
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del self.lineBuffer[self.lineBufferIndex]
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self.terminal.cursorBackward()
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self.terminal.deleteCharacter()
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def handle_DELETE(self):
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if self.lineBufferIndex < len(self.lineBuffer):
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del self.lineBuffer[self.lineBufferIndex]
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self.terminal.deleteCharacter()
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def handle_RETURN(self):
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line = ''.join(self.lineBuffer)
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self.lineBuffer = []
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self.lineBufferIndex = 0
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self.terminal.nextLine()
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self.lineReceived(line)
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def handle_INSERT(self):
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assert self.mode in ('typeover', 'insert')
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if self.mode == 'typeover':
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self.setInsertMode()
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else:
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self.setTypeoverMode()
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def lineReceived(self, line):
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pass
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class HistoricRecvLine(RecvLine):
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"""L{TerminalProtocol} which adds both basic line-editing features and input history.
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Everything supported by L{RecvLine} is also supported by this class. In addition, the
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up and down arrows traverse the input history. Each received line is automatically
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added to the end of the input history.
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"""
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def connectionMade(self):
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RecvLine.connectionMade(self)
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self.historyLines = []
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self.historyPosition = 0
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t = self.terminal
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self.keyHandlers.update({t.UP_ARROW: self.handle_UP,
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t.DOWN_ARROW: self.handle_DOWN})
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def currentHistoryBuffer(self):
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b = tuple(self.historyLines)
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return b[:self.historyPosition], b[self.historyPosition:]
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def _deliverBuffer(self, buf):
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if buf:
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for ch in buf[:-1]:
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self.characterReceived(ch, True)
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self.characterReceived(buf[-1], False)
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def handle_UP(self):
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if self.lineBuffer and self.historyPosition == len(self.historyLines):
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self.historyLines.append(self.lineBuffer)
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if self.historyPosition > 0:
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self.handle_HOME()
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self.terminal.eraseToLineEnd()
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self.historyPosition -= 1
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self.lineBuffer = []
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self._deliverBuffer(self.historyLines[self.historyPosition])
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def handle_DOWN(self):
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if self.historyPosition < len(self.historyLines) - 1:
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self.handle_HOME()
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self.terminal.eraseToLineEnd()
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self.historyPosition += 1
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self.lineBuffer = []
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self._deliverBuffer(self.historyLines[self.historyPosition])
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else:
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self.handle_HOME()
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self.terminal.eraseToLineEnd()
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self.historyPosition = len(self.historyLines)
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self.lineBuffer = []
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self.lineBufferIndex = 0
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def handle_RETURN(self):
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if self.lineBuffer:
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self.historyLines.append(''.join(self.lineBuffer))
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self.historyPosition = len(self.historyLines)
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return RecvLine.handle_RETURN(self)
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