Interactive Tcl describes the various facilities for using Tcl interactively.
JMN 2004-03-20: According to 'requirements' tclreadline works with at least some versions of tcl8.4. I struggled to build tclreadline 2.1.1 on FreeBSD5.1, against tcl8.4.6 only to get a core dump when running ::tclreadline::Loop
I've also tried using rlwrap, which does not appear to run on FreeBSD4.9 and which complains "could not open master pty" on my FreeBSD5.1 box.
Seeing as I really only want the basic up & down arrow cycling through history, and not the fancy readline search & autocompletion and whatever else it may offer - is there some other way I can achieve this functionality in a plain tclsh shell? (I need to run this on plain X-less boxes and ssh sessions.)
It seems to me a very unfortunate lack of cross-platform consistency that the functionality I've always taken for granted on windows boxes doesn't seem to work on Unix-like machines. I understand the gnu readline license is unsuitable for inclusion in TCL, but is there no interest in including some *basic* history editing in tclsh to bring it into line with Windows behaviour?
NEM When you say it works on Windows, you mean in the Tk console, or when running tclsh from the command prompt? If the former, then you can just use tkcon on Unix to get the same behaviour (plus a lot more). When running at the command prompt, you could use the history command. It's not as convenient, but it works. I don't think there is any code for readline style editing for tclsh on any platform, so if it works on Windows I assume it's the windows console which makes it work (somehow).
I run rlwrap tclkit and I get a % prompt with full readline history, even across invocations. Give it a try. I use it most often while debugging small scripts while logged in to a remote server.
2004-04-22: I wonder how hard it would be to integrate Tecla with the tcl shell? http://www.astro.caltech.edu/~mcs/tecla/
Unlike readline, this software has a BSD-like license. It'd be nice to have this available across all tcl platforms without having to use special wrappers and workarounds - a 'package require' would do I guess, but it'd be better if it just worked and provided a consistent environment even on platforms such as windows which already automatically provide similar console functionality.
mjs - 2010-12-02 17:15:29
Has anyone considered an alternative to tclreadline using libedit that would be friendly for no-GPL projects?
AMG: Actually, I kind of want to see linenoise get integrated. linenoise is very small and simple, so it can easily be put directly into the Tcl distribution, along with a standard extension that makes it available to the script. The trouble with libedit is that it's uncommon and too large to bundle. If I have some free time I might go ahead and write this extension, along with a Wiki page.