From: Kevin Ryde <user42@zip.com.au>
To: 5808@debbugs.gnu.org
Subject: bug#5808: 23.1; substitute-in-file-name $NOSUCH vs ${NOSUCH}
Date: Wed, 31 Mar 2010 11:18:39 +1100 [thread overview]
Message-ID: <87ljd9cpi8.fsf@blah.blah> (raw)
Evaluating
(substitute-in-file-name "$NOSUCHVAR")
=> "$NOSUCHVAR
but
(substitute-in-file-name "${NOSUCHVAR}")
=> error
Substituting nonexistent environment variable "NOSUCHVAR"
whereas I thought the two ways of writing a variable would be treated
the same.
I'm not sure if this is a bug or a feature. I see they were both errors
in Emacs 21, but that 22 up forgives the first.
If a feature then it'd be good if the docstring had a note explaining
the difference. I'd used then first and then got bitten from the second
throwing an error.
The docstring might also note unpaired braces are an error
(substitute-in-file-name "${HOME")
=> error
primarily in the interests of knowing what circumstances you might have
to condition-case or ignore-errors.
In GNU Emacs 23.1.1 (i486-pc-linux-gnu, GTK+ Version 2.16.5)
of 2009-09-14 on raven, modified by Debian
configured using `configure '--build=i486-linux-gnu' '--host=i486-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib' '--localstatedir=/var/lib' '--infodir=/usr/share/info' '--mandir=/usr/share/man' '--with-pop=yes' '--enable-locallisppath=/etc/emacs23:/etc/emacs:/usr/local/share/emacs/23.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.1/site-lisp:/usr/share/emacs/site-lisp:/usr/share/emacs/23.1/leim' '--with-x=yes' '--with-x-toolkit=gtk' '--with-toolkit-scroll-bars' 'build_alias=i486-linux-gnu' 'host_alias=i486-linux-gnu' 'CFLAGS=-DDEBIAN -g -O2' 'LDFLAGS=-g' 'CPPFLAGS=''
Important settings:
value of $LC_ALL: nil
value of $LC_COLLATE: nil
value of $LC_CTYPE: nil
value of $LC_MESSAGES: nil
value of $LC_MONETARY: nil
value of $LC_NUMERIC: nil
value of $LC_TIME: nil
value of $LANG: en_AU
value of $XMODIFIERS: nil
locale-coding-system: iso-latin-1-unix
default-enable-multibyte-characters: t
next reply other threads:[~2010-03-31 0:18 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-31 0:18 Kevin Ryde [this message]
2010-03-31 1:29 ` bug#5808: 23.1; substitute-in-file-name $NOSUCH vs ${NOSUCH} Stefan Monnier
2010-04-03 0:02 ` Kevin Ryde
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