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Add a bit about autofoo for schemas

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Always a good idea to have copiable snipplets in a porting guide...
This commit is contained in:
Matthias Clasen 2010-04-19 08:54:01 -04:00
parent a96360ad68
commit 1064097504
1 changed files with 30 additions and 7 deletions
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37
docs/reference/gio/migrating.xml
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@ -310,6 +310,36 @@ start_monitoring_trash (void)
<section>
<title>Schema conversion</title>
<para>
If you are porting your application from GConf, most likely you already
have a GConf schema. GIO comes with a commandline tool
<link linkend="gsettings-schema-convert">gsettings-schema-convert</link>
that can help with the task of converting a GConf schema into
an equivalent GSettings schema. The tool is not perfect and
may need assistence in some cases.
</para>
<para>
GSettings schemas are described by XML files that need to get installed
into <filename>$datadir/glib-2.0/schemas</filename>, and need to be
compiled into a binary form by the <link linkend="gschema-compile">gschema-compile</link>
utility. GIO provides variables <literal>gsettingsschemadir</literal>
and <literal>gsettingsupdateschemacache</literal> for the location
and the command, which can be used in <filename>configure.in</filename>
as follows:
<programlisting>
AC_SUBST(gsettingsschemadir, `pkg-config --variable gsettingsschemadir gio-2.0`)
AC_SUBST(gsettingsupdateschemacache, `pkg-config --variable gsettingsupdateschemacache gio-2.0`)
</programlisting>
The corresponding <filename>Makefile.am</filename> fragment looks like
this:
<programlisting>
gsettingsschema_DATA = my.app.gschema.xml
install-data-hook:
$(gsettingsupdateschemacache) $(gsettingsschemadir)
</programlisting>
</para>
<para>
One possible pitfall in doing schema conversion is that the default
values in GSettings schemas are parsed by the #GVariant parser.
@ -390,13 +420,6 @@ start_monitoring_trash (void)
GSettings. By the time you have finished porting your application
you must ensure that all key names are valid.
</para>
<para>
GIO comes with a commandline tool
<link linkend="gsettings-schema-convert">gsettings-schema-convert</link>
that can help with the task of converting a GConf schema into
an equivalent GSettings schema. The tool is not perfect and
may need assistence in some cases.
</para>
</section>
<section><title>Data conversion</title>