[IPython-User] Problem: Custom Tab-Completion through Pyreadline
Thu Jul 1 16:07:51 CDT 2010
Sorry, here's the file itself. The relevant code is on line 42-49, 91-198, and 846-850. Since a number of other files are also needed in order to fully run it, however, I'll just go ahead and provide the link to the project's site if anyone's interested: https://seattle.cs.washington.edu/html/
and the specific place to download the client: https://seattlegeni.cs.washington.edu/geni/download/flibble/
The seash.py in the download package is outdated, so replace it with the one I've attached here. Also, pyreadline needs to be custom installed into the directory that you unzip, which is somewhat similarly structured as the Python 2.5's installed directory. Other than that, you can just directly run the seash.py in the directory that you unzip it from, under ..\seattle\seattle_repy, without worrying too much about the other stuff for the purpose of testing.
From: email@example.com [firstname.lastname@example.org] on behalf of Jörgen Stenarson [email@example.com]
Sent: Thursday, July 01, 2010 11:39 AM
Subject: Re: [IPython-User] Problem: Custom Tab-Completion through Pyreadline
If you could provide a complete example that we can test for ourselves,
i.e. attached .py files, it would be easier to answer your question.
firstname.lastname@example.org skrev 2010-06-30 09:08:
> I'm helping build a cross-platform custom tab completer for a Python
> research project, and I'm using Pyreadline to substitute for the the
> lack of readline on Windows. However, upon installation, despite trying
> to set-up the custom tab completion through the use of readline's
> set_completer function, pyreadline automatically uses the completer
> under basemode.py, shown when it printed out a list of files in the
> directory when I tabbed despite changing the custom tab complete
> function to raise an exception instead. When I ran through the code
> using the Python Debugger, I saw that set_completer(completer.complete)
> was clearly called under rlmain.py, yet the custom tab complete function
> wasn't implemented in the readline somehow.
> I'm using version 1.5 of Pyreadline, installed under a custom directory
> of the research project that essentially uses Python 2.5. I'm testing
> all this through Windows command prompt. I might have overlooked some
> details since I'm still fairly new to Python, but any help would be much
> For reference, I didn't write the TabCompleter code, and it works when
> used in a Unix system with their GNU Readline.
> Alan Loh
> This is the code for the custom tab completion part of the project:
> tabcompletion = True
> import readline
> except ImportError:
> print "Auto tab completion is off, because it is not available on your
> operating system."
> tabcompletion = False
> # Set up the tab completion environment
> if tabcompletion:
> completer = TabCompleter()
> readline.parse_and_bind("tab: complete")
> readline.set_completer_delims(" ")
> ...and this is the TabCompleter class I'm trying to help implement.
> class TabCompleter:
> # Constructor that initializes all the private variables
> def __init__(self):
> # list of files that match the directory of the given prefix
> self._words = 
> # list of files that match the given prefix
> self._matching_words = 
> self._prefix = None
> # Returns the path from a given prefix, by extracting the string up to the
> # last forward slash in the prefix. If no forward slash is found, returns an
> # empty string.
> def _getpath(self, prefix):
> slashpos = prefix.rfind("/")
> currentpath = ""
> if slashpos > -1:
> currentpath = prefix[0 : slashpos+1]
> return currentpath
> # Returns the file name, or a part of the file name, from a given prefix, by
> # extracting the string after the last forward slash in the prefix. If no
> # forward slash is found, returns an empty string.
> def _getfilename(self, prefix):
> # Find the last occurrence of the slash (if any), as it separates the path
> # and the file name.
> slashpos = prefix.rfind("/")
> filename = ""
> # If slash exists and there are characters after the last slash, then the
> # file name is whatever that follows the last slash.
> if slashpos > -1 and slashpos+1 <= len(prefix)-1:
> filename = prefix[slashpos+1:]
> # If no slash is found, then we assume that the entire user input is the
> # prefix of a file name because it does not contain a directory
> elif slashpos == -1:
> filename = prefix
> # If both cases fail, then the entire user input is the name of a
> # directory. Thus, we return the file name as an empty string.
> return filename
> # Returns a list of file names that start with the given prefix.
> def _listfiles(self, prefix):
> # Find the directory specified by the prefix
> currentpath = self._getpath(prefix)
> if not currentpath:
> currentpath = "./"
> filelist = 
> # Attempt to list files from the directory
> currentpath = os.path.expanduser(currentpath)
> filelist = os.listdir(currentpath)
> # We are silently dropping all exceptions because the directory specified
> # by the prefix may be incorrect. In this case, we're returning an empty
> # list, similar to what you would get when you TAB a wrong name in the
> # Unix shell.
> return filelist
> # The completer function required as a callback by the readline module. See
> # also http://docs.python.org/library/readline.html#readline.set_completer
> def complete(self, prefix, index):
> # If the user updates the prefix, then we list files that start with the
> # prefix.
> if prefix != self._prefix:
> self._words = self._listfiles(prefix)
> fn = self._getfilename(prefix)
> # Find the files that match the prefix
> self._matching_words = 
> for word in self._words:
> if word.startswith(fn):
> self._prefix = prefix
> return self._getpath(prefix) + self._matching_words[index]
> except IndexError:
> return None
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