Re: psql and readline

On Sat, Feb 15, 2003 at 03:10:19PM -0600, Ross J. Reedstrom wrote:
> On Fri, Feb 14, 2003 at 11:32:02AM -0500, Tom Lane wrote:
> > Patrick Welche <prlw1@newn.cam.ac.uk> writes:
> > > On Thu, Feb 13, 2003 at 10:25:52AM -0500, Tom Lane wrote:
> > >> Well, is that a bug in your wrapper?  Or must we add a configure test
> > >> for the presence of replace_history_entry()?
> > 
> > > Good question. Easiest for now for me would be add a configure test.
> > 
> > Okay with me --- Ross, can you handle that?

O.K., I found the 'editline' wrapper around 'libedit' that provides
a subset of readline functionality, and used that for testing. On my
Debian Linux systems, editline installs readline compatability headers
(readline.h, history.h) into /usr/include/editline/, so I added tests
for those into configure.in, and src/include/pg_config.h.in, and usage
in src/bin/psql/input.h

I added a test for replace_history_entry() to configure.in, and usage
of it to src/bin/psql/command.c. As you may recall, the original purpose
of this patch was to deal with the interaction of '\e' with the history
buffer.  I implemented replacing the '\e' entry in the buffer with the
query as returned by the edit session and sent to the backend. If the
replace_history_entry function is missing, I now just push the edited
entry onto the history stack, leaving the '\e' in place as well.

Tested on systems with readline, editline, and --without-readline.

Since the patch has now grown to 25 lines, I've posted it over to PATCHES.

Ross