Re: [ESPResSo-devel] Tcl interpreter changed?

[Olaf Lenz]

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Hello!

I have had a look at the "tclline.tcl" file, and I located the problem
in lines 133 and 134:

            set col [expr {$cursorLen % $env(COLUMNS)}]
            set row [expr {$n + ($cursorLen / $env(COLUMNS)) + 1}]

The environment-variable "COLUMNS" is most probably only defined on
Linux systems. This is not very nice. In general, the code seems to rely
on a number of Linux-specific features.
As stated in the file, the code originates from the Tcl wiki at
http://wiki.tcl.tk/. After I have done some reading on the page, it
seems to me that the copyright status of the code is not completely
clear. Although very improbable, in theory, one of the contributors
might sue us for copyright infringement if we simply put it into
ESPResSo. I know, this is annoying and not in the spirit of the thing,
but still, the legal status is unclear.

I would vote to look for a better replacement. In principle, there is a
real Tcl readline[1] package that we could incorporate into ESPResSo.
However, this would require us to generally check how the Tcl/Tk
interpreter of ESPResSo can be extended with additional packages.

Olaf

References:
[1]http://wiki.tcl.tk/12192 or
http://tclreadline.sourceforge.net/tclreadline.html
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