Bug 1204623

Summary:	emacs and editing features do not function under SWI-prolog
Product:	[Fedora] Fedora	Reporter:	Sean A. Fulop <sfulop>
Component:	pl	Assignee:	Petr Pisar <ppisar>
Status:	CLOSED NOTABUG	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	high	Docs Contact:
Priority:	unspecified
Version:	20	CC:	bagnara, mefoster, ppisar
Target Milestone:	---
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-04-03 11:12:52 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Sean A. Fulop 2015-03-23 08:33:00 UTC

Description of problem:
When running swipl, attempted built-in command emacs provides an error that the predicate emacs/0 does not exist.

Furthermore, attempt to use the commmand edit(filename) also returns an error.  Jan Wielemaker has confirmed that this behaviour signifies an improper package build.


Version-Release number of selected component (if applicable):
pl-6.4.1 fc20

How reproducible:


Steps to Reproduce:
1. run swipl
2. try command emacs
3. try command edit(filename)

Actual results:
Errors, commands do not perform

Expected results:
command emacs is supposed to launch the GUI pce-emacs integrated development environment

command edit(filename) is supposed to launch whichever text editor is set as default in swipl; neither command should provide an error


Additional info:

Comment 1 Petr Pisar 2015-04-03 11:12:52 UTC

Executing editor works for me:

?- edit(file('new')).
% Waiting for editor ... 
% Running make to reload modified files
true.

It spawns vim, which is my $EDITOR, on `new' file.

If I install `pl-xpce' package which brings your desired GUI, then it will spawn an XPCE editor. Also if `pl-xpce' package is installed, emacs goal will be available and it spawn XPCE with an Emacs imitiation.

The XPCE is not part of the `pl' package because not all SWI Prolog users needs XPCE or even does not have X server available.

Comment 2 Sean A. Fulop 2015-04-22 07:11:29 UTC

OK I see.  Here is the text that appears in YUM to document the contents of the pl rpm package:

ISO/Edinburgh-style Prolog compiler including modules, auto-load,
libraries, Garbage-collector, stack-expandor, C/C++-interface,
GNU-readline interface, very fast compiler.  Including packages clib
(Unix process control and sockets), cpp (C++ interface), sgml (reading
XML/SGML), sgml/RDF (reading RDF into triples) and XPCE (Graphics UI
toolkit, integrated editor (Emacs-clone) and source-level debugger).


Notice that it states XPCE is included in the pl package.  I had no idea to install a separate package to get it.  I think this documentation should be changed to state that pl-xpce is a separate package.

Comment 3 Petr Pisar 2015-04-22 10:32:58 UTC

Fair enough. I updated the pl's package description in pl-6.6.6-6.fc23. As this is very low severity issue, it will get into older Fedoras only if another update will be necessary there.