On Wed, Jan 6, 2010 at 10:02 AM, Andrea Bolognani <[email protected]> wrote:
> On Tue, Jan 05, 2010 at 11:53:50AM +0330, golnaz nilieh wrote:
>
>> Hello everybody!
>> I'm a newbie to vala language, I faced to a strange problem recently and
>> couldn't find any help in vala documentations.
>> In my app, I have declared a class named "Global" in a file "global.vala":
>>
>> using GLib;
>> public class MyApp.Global : GLib.Object {
>> public static string dataDir = "/usr/local/share/";
>> }
>>
>> And I have a "main.vala" file, whith this code inside:
>>
>> using GLib;
>> using Gtk;
>> public class MyApp.MainWindow : Window {
>> static int main (string[] args) {
>> stdout.printf ("all data is in: " + Global.dataDir);
>> return 0;
>> }
>> }
>
> Hi,
>
> I'm really sorry, I can't help you.
>
> But since I'm doing something similar in a software I'm writing, I'll take
> the occasion and ask a little piece of advice on the list.
>
> You are hard-coding dataDir into your application; assuming you're using
> the GNU autotools, the data directory can be configured using the --prefix
> option of configure. If that value is changed, the hard-coded dataDir will
> not point to the right directory.
>
> What I've done to work around the issue is to create a small utility class,
> where I replace the value of prefix at build time:
>
> public class AutotoolsSupport : GLib.Object {
> public static const string DATA_DIR = "@prefix@/share/";
> }
>
> The above snippet goes in autotoolssupport.vala.in, so that a suitable
> autotoolssupport.vala is generated when AC_SUBS(prefix) is called in
> configure.ac.
>
> I would like to have a cleaner way to refer to @datadir@ from inside a Vala
> source file. Any suggestion?
>
Well actually the best way is to add a target to your Makefile.am like this:
BUILT_SOURCES=config.vala
CLEANFILES=config.vala
config.vala: config.h
echo 'namespace Config {' >$@
echo ' internal const string PACKAGE = "$(PACKAGE)";' >>$@
echo ' internal const string PACKAGE_BUGREPORT =
"$(PACKAGE_BUGREPORT)";' >>$@
echo ' internal const string PACKAGE_NAME = "$(PACKAGE_NAME)";' >>$@
echo ' internal const string PACKAGE_STRING = "$(PACKAGE_STRING)";'
>>$@
echo ' internal const string PACKAGE_TARNAME = "$(PACKAGE_TARNAME)";'
>>$@
echo ' internal const string PACKAGE_URL = "$(PACKAGE_URL)";' >>$@
echo ' internal const string PACKAGE_VERSION = "$(PACKAGE_VERSION)";'
>>$@
echo ' internal const string PACKAGE_DATADIR = "$(datadir)";' >>$@
echo '}' >>$@
because it is also possible to specify --datadir= or --datarootdir=
when calling the configure script.
--
Ali
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