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Re: gnulib and gettextize


From: Eric Blake
Subject: Re: gnulib and gettextize
Date: Sat, 09 Sep 2006 11:40:15 -0600
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According to Bruno Haible on 9/9/2006 11:26 AM:
> Gary V. Vaughan wrote:
>> Untested:
>>
>> m4_define([gt__NEED_NGETTEXT_FU],
>> [shell code to execute after expansion of AM_GNU_GETTEXT,
>>   whenever AM_GETTEXT_NEED_NGETTEXT is present somewhere])
>>
>> AC_DEFUN([AM_GNU_GETTEXT],
>> [
>> ...current contents of AM_GNU_GETTEXT definition...
>>
>> dnl make sure gt__NEED_NGETTEXT_FU is always expanded in the
>> dnl presence of AM_GETTEXT_NEED_NGETTEXT:
>> AC_PROVIDE_IFELSE([AM_GETTEXT_NEED_NGETTEXT],
>>          [gt__NEED_NGETTEXT_FU],
>>    [m4_define([AM_GETTEXT_NEED_NGETTEXT],
>>      [defn([AM_GETTEXT_NEED_NGETTEXT])
>>      gt__NEED_NGETTEXT_FU
>>    ])dnl
>> ])# AM_GNU_GETTEXT
> 
> Thanks for the idea. With this one can have some shell code be executed
> after the last invocation of any of the two given macros. But what I'm
> looking for is even more: make it known at the beginning of the first
> macro that an invocation of the second macro is coming later.

It is not possible to know what macros will be invoked later in the file.
 But with diversions, it is possible for macros invoked later to emit
shell code that will be invoked earlier, by making sure that
gt__NEED_NGETTEXT_FU expands to shell code in a lower diversion number
than AM_GNU_GETTEXT.  That way, AM_GNU_GETTEXT can emit shell code that
depends on the value of a shell variable, where the shell variable is
guaranteed to be set (either to a default if gt__NEED_NGETTEXT_FU is never
called, or to a non-default by gt__NEED_NGETTEXT_FU) in an earlier diversion.

- --
Life is short - so eat dessert first!

Eric Blake             address@hidden
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