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i18n: add stub Q_() wrapper for ngettext 

The Q_ function translates a string representing some pharse with an
alternative plural form and uses the 'count' argument to choose which
form to return.  Use of Q_ solves the "%d noun(s)" problem in a way
that is portable to languages outside the Germanic and Romance
families.

In English, the semantics of Q_(sing, plur, count) are roughly
equivalent to

	count == 1 ? _(sing) : _(plur)

while in other languages there can be more variants (count == 0; more
random-looking rules based on the historical pronunciation of the
number).  Behind the scenes, the singular form is used to look up a
family of translations and the plural form is ignored unless no
translation is available.

Define such a Q_ in gettext.h with the English semantics so C code can
start using it to mark phrases with a count for translation.

The name "Q_" is taken from subversion and stands for "quantity".
Many projects just use ngettext directly without a wrapper analogous
to _; we should not do so because git's gettext.h is meant not to
conflict with system headers that might include libintl.h.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jonathan Nieder 2011-03-09 21:17:58 -06:00 committed by Junio C Hamano
parent 309552295a
commit 0c9ea33b90
1 changed files with 10 additions and 2 deletions
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12
gettext.h
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@ -9,8 +9,8 @@
#ifndef GETTEXT_H
#define GETTEXT_H
#ifdef _
#error "namespace conflict: '_' is pre-defined?"
#if defined(_) || defined(Q_)
#error "namespace conflict: '_' or 'Q_' is pre-defined?"
#endif
#define FORMAT_PRESERVING(n) __attribute__((format_arg(n)))
@ -26,6 +26,14 @@ static inline FORMAT_PRESERVING(1) const char *_(const char *msgid)
return use_gettext_poison() ? "# GETTEXT POISON #" : msgid;
}
static inline FORMAT_PRESERVING(1) FORMAT_PRESERVING(2)
const char *Q_(const char *msgid, const char *plu, unsigned long n)
{
if (use_gettext_poison())
return "# GETTEXT POISON #";
return n == 1 ? msgid : plu;
}
/* Mark msgid for translation but do not translate it. */
#define N_(msgid) (msgid)