This file is indexed.

/usr/lib/python2.7/dist-packages/curtsies/input.py is in python-curtsies 0.2.6-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
import locale
import os
import signal
import select
import sys
import termios
import time
import tty

import logging
logger = logging.getLogger(__name__)


from .termhelpers import Nonblocking
from . import events

PY3 = sys.version_info[0] >= 3

READ_SIZE = 1024
assert READ_SIZE >= events.MAX_KEYPRESS_SIZE
# if a keypress could require more bytes than we read to be identified,
# the paste logic that reads more data as needed might not work.


class ReplacedSigIntHandler(object):
    def __init__(self, handler):
        self.handler = handler

    def __enter__(self):
        self.orig_sigint_handler = signal.getsignal(signal.SIGINT)
        signal.signal(signal.SIGINT, self.handler)

    def __exit__(self, type, value, traceback):
        signal.signal(signal.SIGINT, self.orig_sigint_handler)


class Input(object):
    """Keypress and control event generator"""
    def __init__(self, in_stream=None, keynames='curtsies',
                 paste_threshold=events.MAX_KEYPRESS_SIZE+1, sigint_event=False):
        """Returns an Input instance.

        Args:
            in_stream (file): Defaults to sys.__stdin__
            keynames (string): How keypresses should be named - one of
              'curtsies', 'curses', or 'plain'.
            paste_threshold (int): How many bytes must be read in one
              os.read on the in_stream to trigger the keypresses they
              represent to be combined into a single paste event
            sigint_event (bool): Whether SIGINT signals from the OS
              should be intercepted and returned as SigIntEvent objects
        """
        if in_stream is None:
            in_stream = sys.__stdin__
        self.in_stream = in_stream
        self.unprocessed_bytes = []  # leftover from stdin, unprocessed yet
        self.keynames = keynames
        self.paste_threshold = paste_threshold
        self.sigint_event = sigint_event
        self.sigints = []

        self.readers = []
        self.queued_interrupting_events = []
        self.queued_events = []
        self.queued_scheduled_events = []

    # prospective: this could be useful for an external select loop
    def fileno(self):
        return self.in_stream.fileno()

    def __enter__(self):
        self.original_stty = termios.tcgetattr(self.in_stream)
        tty.setcbreak(self.in_stream, termios.TCSANOW)

        if sys.platform == 'darwin':
            attrs = termios.tcgetattr(self.in_stream)
            VDSUSP = termios.VSUSP + 1
            attrs[-1][VDSUSP] = 0
            termios.tcsetattr(self.in_stream, termios.TCSANOW, attrs)

        if self.sigint_event:
            self.orig_sigint_handler = signal.getsignal(signal.SIGINT)
            signal.signal(signal.SIGINT, self.sigint_handler)
        return self

    def __exit__(self, type, value, traceback):
        if self.sigint_event:
            signal.signal(signal.SIGINT, self.orig_sigint_handler)
        termios.tcsetattr(self.in_stream, termios.TCSANOW, self.original_stty)

    def sigint_handler(self, signum, frame):
        self.sigints.append(events.SigIntEvent())

    def __iter__(self):
        return self

    def next(self):
        return self.send(None)

    __next__ = next

    def unget_bytes(self, string):
        """Adds bytes to be internal buffer to be read

        This method is for reporting bytes from an in_stream read
        not initiated by this Input object"""

        self.unprocessed_bytes.extend(string[i:i + 1]
                                      for i in range(len(string)))

    def _wait_for_read_ready_or_timeout(self, timeout):
        """Returns tuple of whether stdin is ready to read and an event.

        If an event is returned, that event is more pressing than reading
        bytes on stdin to create a keyboard input event.
        If stdin is ready, either there are bytes to read or a SIGTSTP
        triggered by dsusp has been received"""
        remaining_timeout = timeout
        t0 = time.time()
        while True:
            try:
                (rs, _, _) = select.select(
                    [self.in_stream.fileno()] + self.readers,
                    [], [], remaining_timeout)
                if not rs:
                    return False, None
                r = rs[0]  # if there's more than one, get it in the next loop
                if r == self.in_stream.fileno():
                    return True, None
                else:
                    os.read(r, 1024)
                    if self.queued_interrupting_events:
                        return False, self.queued_interrupting_events.pop(0)
                    elif remaining_timeout is not None:
                        remaining_timeout = max(0, t0 + timeout - time.time())
                        continue
                    else:
                        continue

            except select.error:
                if self.sigints:
                    return False, self.sigints.pop()
                if remaining_timeout is not None:
                    remaining_timeout = max(timeout - (time.time() - t0), 0)

    def send(self, timeout=None):
        """Returns an event or None if no events occur before timeout."""
        if self.sigint_event:
            with ReplacedSigIntHandler(self.sigint_handler):
                return self._send(timeout)
        else:
            return self._send(timeout)

    def _send(self, timeout):
        def find_key():
            """Returns keypress identified by adding unprocessed bytes or None"""
            current_bytes = []
            while self.unprocessed_bytes:
                current_bytes.append(self.unprocessed_bytes.pop(0))
                e = events.get_key(current_bytes,
                                   getpreferredencoding(),
                                   keynames=self.keynames,
                                   full=len(self.unprocessed_bytes)==0)
                if e is not None:
                    self.current_bytes = []
                    return e
            if current_bytes:  # incomplete keys shouldn't happen
                raise ValueError("Couldn't identify key sequence: %r" % self.current_bytes)

        if self.sigints:
            return self.sigints.pop()
        if self.queued_events:
            return self.queued_events.pop(0)
        if self.queued_interrupting_events:
            return self.queued_interrupting_events.pop(0)

        if self.queued_scheduled_events:
            self.queued_scheduled_events.sort()  #TODO use a data structure that inserts sorted
            when, _ = self.queued_scheduled_events[0]
            if when < time.time():
                logger.warning('popping an event! %r %r',
                               self.queued_scheduled_events[0],
                               self.queued_scheduled_events[1:])
                return self.queued_scheduled_events.pop(0)[1]
            else:
                time_until_check = min(max(0, when - time.time()), timeout if timeout is not None else sys.maxsize)
        else:
            time_until_check = timeout

        # try to find an already pressed key from prev input
        e = find_key()
        if e is not None:
            return e

        stdin_ready_for_read, event = self._wait_for_read_ready_or_timeout(time_until_check)
        if event:
            return event
        if self.queued_scheduled_events and when < time.time():  # when should always be defined
            # because queued_scheduled_events should not be modified during this time
            logger.warning('popping an event! %r %r', self.queued_scheduled_events[0],
                           self.queued_scheduled_events[1:])
            return self.queued_scheduled_events.pop(0)[1]
        if not stdin_ready_for_read:
            return None

        num_bytes = self._nonblocking_read()
        if num_bytes == 0:
            # thought stdin was ready, but not bytes to read is triggered
            # when SIGTSTP was send by dsusp
            return None

        if self.paste_threshold is not None and num_bytes > self.paste_threshold:
            paste = events.PasteEvent()
            while True:
                if len(self.unprocessed_bytes) < events.MAX_KEYPRESS_SIZE:
                    self._nonblocking_read()  # may need to read to get the rest of a keypress
                e = find_key()
                if e is None:
                    return paste
                else:
                    paste.events.append(e)
        else:
            e = find_key()
            assert e is not None
            return e

    def _nonblocking_read(self):
        """Returns the number of characters read and adds them to self.unprocessed_bytes"""
        with Nonblocking(self.in_stream):
            if PY3:
                try:
                    data = os.read(self.in_stream.fileno(), READ_SIZE)
                except BlockingIOError:
                    return 0
                if data:
                    self.unprocessed_bytes.extend(data[i:i+1] for i in range(len(data)))
                    return len(data)
                else:
                    return 0
            else:
                try:
                    data = os.read(self.in_stream.fileno(), READ_SIZE)
                except OSError:
                    return 0
                else:
                    self.unprocessed_bytes.extend(data)
                    return len(data)

    def event_trigger(self, event_type):
        """Returns a callback that creates events.

        Returned callback function will add an event of type event_type
        to a queue which will be checked the next time an event is requested."""
        def callback(**kwargs):
            self.queued_events.append(event_type(**kwargs))
        return callback

    def scheduled_event_trigger(self, event_type):
        """Returns a callback that schedules events for the future.

        Returned callback function will add an event of type event_type
        to a queue which will be checked the next time an event is requested."""
        def callback(when, **kwargs):
            self.queued_scheduled_events.append((when, event_type(when=when, **kwargs)))
        return callback

    def threadsafe_event_trigger(self, event_type):
        """Returns a callback to creates events, interrupting current event requests.

        Returned callback function will create an event of type event_type
        which will interrupt an event request if one
        is concurrently occuring, otherwise adding the event to a queue
        that will be checked on the next event request."""
        readfd, writefd = os.pipe()
        self.readers.append(readfd)

        def callback(**kwargs):
            self.queued_interrupting_events.append(event_type(**kwargs))  #TODO use a threadsafe queue for this
            logger.warning('added event to events list %r', self.queued_interrupting_events)
            os.write(writefd, b'interrupting event!')
        return callback


def getpreferredencoding():
    return locale.getpreferredencoding() or sys.getdefaultencoding()


def main():
    with Input() as input_generator:
        print(repr(input_generator.send(2)))
        print(repr(input_generator.send(1)))
        print(repr(input_generator.send(.5)))
        print(repr(input_generator.send(.2)))
        for e in input_generator:
            print(repr(e))

if __name__ == '__main__':
    main()