Public bug reported:
There is a bug in the 12.04 pexpect package that results in the ANSI
library throwing an exception when it receives the "Erase in Line"
escape code ("ESC[2K"):
Traceback (most recent call last):
File "./pexpect-check.py", line 12, in <module>
screen.write("%c[2K" %(0x1B))
File "/usr/lib/python2.7/dist-packages/ANSI.py", line 257, in write
self.process(c)
File "/usr/lib/python2.7/dist-packages/ANSI.py", line 248, in process
self.state.process(c)
File "/usr/lib/python2.7/dist-packages/FSM.py", line 223, in process
self.action (self)
File "/usr/lib/python2.7/dist-packages/ANSI.py", line 118, in DoEraseLine
if arg == 0:
NameError: global name 'arg' is not defined
The following test code can be used to test for this failure:
#!/usr/bin/env python
import sys
import ANSI
print "Testing operation of \"DoEraseLine\" in ANSI library: ",
screen = ANSI.ANSI(25,80)
screen.write("This line should be deleted")
#print screen.pretty()
try:
screen.write("%c[2K" %(0x1B))
#print screen.pretty()
except:
print "FAIL"
sys.exit(1)
print "PASS"
sys.exit(0)
This has been fixed in later versions of pexpect, but is broken in the (still
supported?) version in precise. The minimal patch required to resolve this
issue is:
--- ANSI.py.orig 2015-07-23 10:22:11.561742106 +0100
+++ ANSI.py 2015-07-23 10:22:29.841339490 +0100
@@ -114,6 +114,7 @@
def DoEraseLine (fsm):
+ arg = int(fsm.memory.pop())
screen = fsm.memory[0]
if arg == 0:
screen.end_of_line()
** Affects: pexpect (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1477472
Title:
Failure of ANSI library when reciving "Erase in Line" ANSI escape code
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