[gimp] desktop: make the appstream metainfo file translatable.

[Jehan Pagès <jehanp src gnome org>]

commit 60f09c3482754f19e057b4f5ed20eb60e0231034
Author: Jehan <jehan girinstud io>
Date:   Sat Jun 17 04:31:22 2017 +0200

    desktop: make the appstream metainfo file translatable.
    
    To have the name and summary translatable, rename as .in file, add
    underscore on localizable tags and add to POTFILES.in.
    Also clean out trailing whitespace and weird characters, add indentation
    and fix tag s/updatecontact/update_contact/.
    Finally add an appstream-util validation so that the file syntax is
    checked during a `make check`.

 desktop/Makefile.am                      |   28 +++++++++++++---------------
 desktop/gimp-data-extras.metainfo.xml    |   14 --------------
 desktop/gimp-data-extras.metainfo.xml.in |   13 +++++++++++++
 desktop/test-appdata.sh                  |    1 +
 po/POTFILES.in                           |    1 +
 5 files changed, 28 insertions(+), 29 deletions(-)
---
diff --git a/desktop/Makefile.am b/desktop/Makefile.am
index 04e432d..5c84625 100644
--- a/desktop/Makefile.am
+++ b/desktop/Makefile.am
@@ -3,10 +3,8 @@
 desktop_in_files = gimp.desktop.in.in
 desktop_files = $(desktop_in_files:.desktop.in.in=.desktop)
 
-appdata_in_files = gimp.appdata.xml.in
-appdata_files = \
-       $(appdata_in_files:.appdata.xml.in=.appdata.xml) \
-       gimp-data-extras.metainfo.xml
+appstream_in_files = gimp.appdata.xml.in gimp-data-extras.metainfo.xml.in
+appstream_files = $(appstream_in_files:.xml.in=.xml)
 
 if DESKTOP_DATADIR
 
@@ -14,7 +12,7 @@ applicationsdir = $(DESKTOP_DATADIR)/applications
 applications_DATA = $(desktop_files)
 
 appdatadir = $(DESKTOP_DATADIR)/appdata
-appdata_DATA = $(appdata_files)
+appdata_DATA = $(appstream_files)
 
 icons16dir = $(DESKTOP_DATADIR)/icons/hicolor/16x16/apps
 icons16_DATA = 16x16/gimp.png
@@ -42,19 +40,19 @@ install-data-hook:
 endif
 
 EXTRA_DIST = \
-       $(appdata_in_files)     \
-       test-appdata.sh         \
-       gimp.desktop.in.in      \
-       16x16/gimp.png          \
-       22x22/gimp.png          \
-       24x24/gimp.png          \
-       32x32/gimp.png          \
-       48x48/gimp.png          \
-       64x64/gimp.png          \
+       $(appstream_in_files) \
+       test-appdata.sh       \
+       gimp.desktop.in.in    \
+       16x16/gimp.png        \
+       22x22/gimp.png        \
+       24x24/gimp.png        \
+       32x32/gimp.png        \
+       48x48/gimp.png        \
+       64x64/gimp.png        \
        256x256/gimp.png
 
 
-DISTCLEANFILES = $(desktop_files) $(appdata_files)
+DISTCLEANFILES = $(desktop_files) $(appstream_files)
 
 @INTLTOOL_XML_RULE@
 
diff --git a/desktop/gimp-data-extras.metainfo.xml.in b/desktop/gimp-data-extras.metainfo.xml.in
new file mode 100644
index 0000000..0d7cc39
--- /dev/null
+++ b/desktop/gimp-data-extras.metainfo.xml.in
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Copyright 2015 Jiri Eischmann <eischmann redhat com> -->
+<component type="addon">
+  <id>gimp-data-extras</id>
+  <extends>gimp.desktop</extends>
+  <_name>Extra files for GIMP</_name>
+  <_summary>Patterns, gradients, and other extra files for GIMP</_summary>
+  <url type="homepage">http://www.gimp.org/</url>
+  <url type="bugtracker">https://bugzilla.gnome.org/enter_bug.cgi?product=GIMP</url>
+  <metadata_license>CC0-1.0</metadata_license>
+  <project_license>GPL-3.0+</project_license>
+  <update_contact>alexandre prokoudine gmail com</update_contact>
+</component>
diff --git a/desktop/test-appdata.sh b/desktop/test-appdata.sh
index e263b70..5419aa7 100755
--- a/desktop/test-appdata.sh
+++ b/desktop/test-appdata.sh
@@ -1,3 +1,4 @@
 #!/bin/sh
 
 appstream-util validate-strict ${GIMP_TESTING_ABS_TOP_SRCDIR}/desktop/gimp.appdata.xml.in
+appstream-util validate-strict ${GIMP_TESTING_ABS_TOP_SRCDIR}/desktop/gimp-data-extras.metainfo.xml.in
diff --git a/po/POTFILES.in b/po/POTFILES.in
index 6e6327d..1dd6dc7 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -4,6 +4,7 @@
 [encoding: UTF-8]
 
 desktop/gimp.appdata.xml.in
+desktop/gimp-data-extras.metainfo.xml.in
 desktop/gimp.desktop.in.in
 
 app/about.h