[IPython-dev] [Pythonmac-SIG] readline support for OS X Leopard
bwaters at nrao.edu
Wed Oct 31 13:43:03 EDT 2007
The segfault was in binding to the "complete" command; it does not
segfault (and seems to work) if I bind to "rl_complete" instead.
*However*, I am not sure that this is what IPython wants.
I am going to assume that rl_complete is the correct thing (at the
moment) and that IPython maps the appropriate completer via
We have a couple of problems, though.
A) The commands that are included in the default ipythonrc use
readline syntax, and every one of them must be mapped to EditLine syntax
B) Passing plausible values into Leopard's readline.parse_and_bind
causes a segmentation fault. Sometimes. When it's compiled Python.
Problem B is a bug report to Apple and I don't know for sure that I'll
be able to fix.
Problem A - what to do about EditLine syntax in general - may best be
left to the new user prefs stuff. I don't know.
What I am doing at the moment is hard-coding the mapping of the tab-
completion as a special case in IPython's rilneimpl.py
I don't like that, but it works.
Also -- and a path to a Better World -- you can check IPython's
rpimpl.py for a "uses_libedit" boolean value. We could add some
logic in iplib.py that checks this value and reads an alternate
ipythonrc in case we're running on Leopard. I get nauseous thinking
Here are a couple of kludges for the specific case of tab-completion
1) Explicitly check for libedit on Darwin and bind the tab to
rl_complete if so:
--- IPython/rlineimpl.py 2007-10-30 17:34:13.000000000 -0600
+++ IPython/rlineimpl.py 2007-10-31 10:54:23.000000000 -0600
@@ -29,6 +29,16 @@
print "Failed GetOutputFile"
have_readline = False
+uses_libedit = False
+if sys.platform == 'darwin' and have_readline:
+ import commands
+ (status, result) = commands.getstatusoutput( "otool -L %s | grep
libedit" % _rl.__file__ )
+ if status == 0 and len(result) > 0:
+ # we are bound to libedit - new in Leopard
+ _rl.parse_and_bind("bind ^I rl_complete")
+ print "Leopard libedit detected."
+ uses_libedit = True
# the clear_history() function was only introduced in Python 2.4 and is
# actually optional in the readline API, so we must explicitly check
# existence. Some known platforms actually don't have it. This thread:
2) Ignore any attempt to re-bind the tab key in the ipythonrc if we're
--- IPython/iplib.py 2007-10-30 18:32:36.000000000 -0600
+++ IPython/iplib.py 2007-10-31 10:59:03.000000000 -0600
@@ -1325,7 +1325,10 @@
if inputrc_name is None:
home_dir = get_home_dir()
if home_dir is not None:
- inputrc_name = os.path.join(home_dir,'.inputrc')
+ inputrc_name = '.inputrc'
+ if readline.uses_libedit:
+ inputrc_name = '.editrc'
+ inputrc_name = os.path.join(home_dir, inputrc_name)
@@ -1341,8 +1344,11 @@
# Configure readline according to user's prefs
for rlcommand in self.rc.readline_parse_and_bind:
- print rlcommand
+ if rlcommand.startswith("tab"):
+ if not readline.uses_libedit:
+ print rlcommand
# remove some chars from the delimiters list
delims = readline.get_completer_delims()
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