Add third_party/pexpect

third_party/pexpect/examples/ftp.py

Index: third_party/pexpect/examples/ftp.py
diff --git a/third_party/pexpect/examples/ftp.py b/third_party/pexpect/examples/ftp.py
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+++ b/third_party/pexpect/examples/ftp.py
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+#!/usr/bin/env python
+
+'''This demonstrates an FTP "bookmark". This connects to an ftp site; does a
+few ftp stuff; and then gives the user interactive control over the session. In
+this case the "bookmark" is to a directory on the OpenBSD ftp server. It puts
+you in the i386 packages directory. You can easily modify this for other sites.
+
+PEXPECT LICENSE
+
+    This license is approved by the OSI and FSF as GPL-compatible.
+        http://opensource.org/licenses/isc-license.txt
+
+    Copyright (c) 2012, Noah Spurrier <noah@noah.org>
+    PERMISSION TO USE, COPY, MODIFY, AND/OR DISTRIBUTE THIS SOFTWARE FOR ANY
+    PURPOSE WITH OR WITHOUT FEE IS HEREBY GRANTED, PROVIDED THAT THE ABOVE
+    COPYRIGHT NOTICE AND THIS PERMISSION NOTICE APPEAR IN ALL COPIES.
+    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+    MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+'''
+
+from __future__ import absolute_import
+from __future__ import print_function
+from __future__ import unicode_literals
+
+import pexpect
+import sys
+
+# Note that, for Python 3 compatibility reasons, we are using spawnu and
+# importing unicode_literals (above). spawnu accepts Unicode input and
+# unicode_literals makes all string literals in this script Unicode by default.
+child = pexpect.spawnu('ftp ftp.openbsd.org')
+
+child.expect('(?i)name .*: ')
+child.sendline('anonymous')
+child.expect('(?i)password')
+child.sendline('pexpect@sourceforge.net')
+child.expect('ftp> ')
+child.sendline('cd /pub/OpenBSD/3.7/packages/i386')
+child.expect('ftp> ')
+child.sendline('bin')
+child.expect('ftp> ')
+child.sendline('prompt')
+child.expect('ftp> ')
+child.sendline('pwd')
+child.expect('ftp> ')
+print("Escape character is '^]'.\n")
+sys.stdout.write (child.after)
+sys.stdout.flush()
+child.interact() # Escape character defaults to ^]
+# At this point this script blocks until the user presses the escape character
+# or until the child exits. The human user and the child should be talking
+# to each other now.
+
+# At this point the script is running again.
+print('Left interactve mode.')
+
+# The rest is not strictly necessary. This just demonstrates a few functions.
+# This makes sure the child is dead; although it would be killed when Python exits.
+if child.isalive():
+    child.sendline('bye') # Try to ask ftp child to exit.
+    child.close()
+# Print the final state of the child. Normally isalive() should be FALSE.
+if child.isalive():
+    print('Child did not exit gracefully.')
+else:
+    print('Child exited gracefully.')
+