Re: enable GNU readline by default?

[Bastian M. <bma...@we...>]

Timoth=E9e Lecomte wrote:
> I like Bastian's idea to use a BSD-licensed equivalent, if it is=20
> maintained and broadly available. Otherwise it is gnuplot's license tha=
t=20
> needs some more attention. It is a matter of honesty.

The discussion about readline/libedit has come up in the past already - s=
ee e.g.
http://search.gmane.org/?query=3Dlibedit&group=3Dgmane.comp.graphics.gnup=
lot.devel
- so it wasn't my idea. But it has been on my todo-list for a while now. =
;-)

I did a quick and dirty test if gnuplot/libedit may be compiled using
cygwin. Here're some observations:

command.c (restore_prompt()):
	rl_forced_update_display() is not supported by libedit
gp_hist.h:
	have to include <editline/readline.h> instead of <readline/history.h>
history.c (write_history_list()):
	history_list() is not supported by libedit
mouse.c (alert()):
	rl_ding() is not supported by libedit
plot.c:
	have to include <editline/readline.h> instead of <readline/tilde.h>
	variable rl_complete_with_tilde_expansion is not available (main())
readline.h:
	include <editline/readline.h> instead of <readline/readline.h>


Most of the changes needed to get it compiling are really minor.
But there're some problems:
* The missing rl_forced_update_display() causes some text display problem=
s.
* It is not clear (to me) if the lack of rl_complete_with_tilde_expansion=
 is one
* write_history_list() has to be rewritten using the available functions
* some of the functions in libedit are stubs only and I haven't checked i=
f
   gnuplot uses any of these (see editline/readline.h)
* on my box not all keys worked as expected (might be a configuration pro=
blem
   on my side though)

Bastian