GNU bug report logs - #18127
add-to-load-path adds a path twice

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Alex Kost <alezost <at> gmail.com>
Subject: bug#18127: closed (Re: bug#18127: add-to-load-path adds a path twice)
Date: Wed, 30 Jul 2014 18:37:03 +0000

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Your bug report

#18127: add-to-load-path adds a path twice

which was filed against the guile package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 18127 <at> debbugs.gnu.org.

-- 
18127: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=18127
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Ian Price <ianprice90 <at> googlemail.com>
To: Alex Kost <alezost <at> gmail.com>
Cc: 18127-done <at> debbugs.gnu.org, 18127 <at> debbugs.gnu.org
Subject: Re: bug#18127: add-to-load-path adds a path twice
Date: Wed, 30 Jul 2014 19:36:36 +0100

Alex Kost <alezost <at> gmail.com> writes:

> taylanub from #guile explained that it may happen because in the REPL
> the compilation and execution happen in the same session and
> “‘add-to-load-path’ takes care of modifying the path both at
> compile-time and at run-time.” (from manual).

This is correct, it will also happen in scripts if they are
auto-compiled, but you will only see it once on subsequent runs, since
macro-expansion doesn't need to happen again.

The fix is simple, and there is no harm in it, so I've pushed a fix to
stable-2.0.

> Also I have a question: Why there is no ‘add-to-load-compiled-path’?  I
> think such function may also be useful.

Fair question. I have no idea about the answer, but I've not touched
this one. As a general principle, I wouldn't like to see us have a
separate macro for each of these.

Thanks

-- 
Ian Price -- shift-reset.com

"Programming is like pinball. The reward for doing it well is
the opportunity to do it again" - from "The Wizardy Compiled"

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From: Alex Kost <alezost <at> gmail.com>
To: bug-guile <at> gnu.org
Subject: add-to-load-path adds a path twice
Date: Mon, 28 Jul 2014 17:06:22 +0400

Hello, I noticed that ‘add-to-load-path’ adds a path 2 times when it is
called in Guile REPL.

taylanub from #guile explained that it may happen because in the REPL
the compilation and execution happen in the same session and
“‘add-to-load-path’ takes care of modifying the path both at
compile-time and at run-time.” (from manual).

Here is the session for illustrating the bug (if it's a bug) :

$ guile
GNU Guile 2.0.11
Copyright (C) 1995-2014 Free Software Foundation, Inc.

Guile comes with ABSOLUTELY NO WARRANTY; for details type `,show w'.
This program is free software, and you are welcome to redistribute it
under certain conditions; type `,show c' for details.

Enter `,help' for help.
scheme@(guile-user)> %load-path
$1 = ( "/usr/share/guile/2.0" "/usr/share/guile/site/2.0" "/usr/share/guile/site" "/usr/share/guile")
scheme@(guile-user)> (add-to-load-path "foo")
scheme@(guile-user)> %load-path
$2 = ("foo" "foo" "/usr/share/guile/2.0" "/usr/share/guile/site/2.0" "/usr/share/guile/site" "/usr/share/guile")
scheme@(guile-user)> ,q


Also I have a question: Why there is no ‘add-to-load-compiled-path’?  I
think such function may also be useful.

Thanks,
Alex

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