[recipes] Add a function to get release info

[Matthias Clasen <matthiasc src gnome org>]

commit 676894aa30d7cff6487f7f543fdfc2bb08d96eb3
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Feb 25 20:22:34 2017 -0500

    Add a function to get release info
    
    This works by parsing our own appdata.

 configure.ac     |    2 +-
 meson.build      |    4 ++
 src/Makefile.am  |   10 ++++-
 src/gr-appdata.c |  122 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/gr-appdata.h |   36 ++++++++++++++++
 src/meson.build  |    1 +
 6 files changed, 173 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 365b67f..6e7e080 100644
--- a/configure.ac
+++ b/configure.ac
@@ -139,11 +139,11 @@ dnl ***********************************************************************
 PKG_CHECK_MODULES(RECIPES, [gmodule-2.0
                             gio-2.0 >= 2.42
                             gtk+-3.0 >= 3.22
+                            appstream-glib
                             $AUTOAR_DEP
                             $GSPELL_DEP
                             $CANBERRA_DEP])
 
-
 LIBGD_INIT([tagged-entry static])
 
 dnl ***********************************************************************
diff --git a/meson.build b/meson.build
index aafccb1..1dc30a6 100644
--- a/meson.build
+++ b/meson.build
@@ -62,11 +62,14 @@ endif
 
 deps = [ dependency('gtk+-3.0', version : '>=3.22'),
          dependency('gmodule-export-2.0'),
+         dependency('appstream-glib'),
          autoar_dep,
          gspell_dep,
          canberra_dep,
          libgd_dep ]
 
+datadir = join_paths([ get_option('prefix'),
+                       get_option('datadir') ])
 pkgdatadir = join_paths([ get_option('prefix'),
                           get_option('datadir'),
                           'gnome-recipes' ])
@@ -75,6 +78,7 @@ conf.set_quoted('G_LOG_DOMAIN', 'org.gnome.Recipes')
 conf.set_quoted('PACKAGE_NAME', 'gnome-recipes')
 conf.set_quoted('PACKAGE_VERSION', meson.project_version())
 conf.set_quoted('GETTEXT_PACKAGE', 'gnome-recipes')
+conf.set_quoted('DATADIR', datadir)
 conf.set_quoted('PKGDATADIR', pkgdatadir)
 conf.set_quoted('LOCALEDIR', join_paths([ get_option('prefix'),
                                           get_option('datadir'),
diff --git a/src/Makefile.am b/src/Makefile.am
index cb7c17c..520bd6e 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -10,6 +10,7 @@ gnome_recipes_CFLAGS = \
        $(RECIPES_CFLAGS)               \
        -DPACKAGE_NAME=\"$(PACKAGE_NAME)\"      \
        -DPKGDATADIR=\"$(pkgdatadir)\"  \
+       -DDATADIR=\"$(datadir)\"        \
        -DLOCALEDIR=\"$(localedir)\"    \
        -DCOMMIT_ID=\"$(commitid)\"     \
        -DLIBGD_INFO=\"$(libgd_info)\"  \
@@ -31,6 +32,8 @@ gnome_recipes_SOURCES = \
        gr-account.c            \
        gr-app.h                \
        gr-app.c                \
+       gr-appdata.h            \
+       gr-appdata.c            \
        gr-category-tile.h      \
        gr-category-tile.c      \
        gr-chef.h               \
@@ -149,7 +152,9 @@ BUILT_SOURCES = \
 DISTCLEANFILES = \
        ingredients.inc         \
        no-ingredients.inc      \
-       segments.inc
+       segments.inc            \
+       cuisine.css             \
+       news
 
 MAINTAINERCLEANFILES = \
        resources-ui.c          \
@@ -207,6 +212,9 @@ gr-shell-search-provider-dbus.h gr-shell-search-provider-dbus.c: Makefile.am $(s
 cuisine.css: cuisine.css.in
        $(AM_V_GEN) sed -e "s|\@pkgdatadir\@|$(pkgdatadir)|" $< > $@
 
+news:
+       $(AM_V_GEN) $(top_builddir)/tools/get-news 
$(top_srcdir)/data/appdata/org.gnome.Recipes.appdata.xml.in $(PACKAGE_VERSION) > $@
+
 EXTRA_DIST = \
        shell-search-provider-dbus-interfaces.xml       \
        recipes-ui.gresource.xml                        \
diff --git a/src/gr-appdata.c b/src/gr-appdata.c
new file mode 100644
index 0000000..3f9df1b
--- /dev/null
+++ b/src/gr-appdata.c
@@ -0,0 +1,122 @@
+/* gr-appdata.c:
+ *
+ * Copyright (C) 2017 Matthias Clasen <mclasen redhat com>
+ *
+ * Licensed under the GNU General Public License Version 3
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <appstream-glib.h>
+#include <gr-appdata.h>
+
+static void
+release_info_free (gpointer data)
+{
+        ReleaseInfo *ri = data;
+
+        g_free (ri->version);
+        g_date_time_unref (ri->date);
+        g_free (ri->news);
+        g_free (ri);
+}
+
+static int
+version_compare (const char *v1,
+                 const char *v2)
+{
+        const char *p1, *p2;
+        char *q;
+        int a1, a2;
+        int i;
+
+        p1 = v1;
+        p2 = v2;
+        for (i = 0; i < 3; i++) {
+                a1 = (int)g_ascii_strtoll (p1, &q, 10);
+                if (q) {
+                        if (*q == '.') q++;
+                        p1 = (const char *)q;
+                }
+                a2 = (int)g_ascii_strtoll (p2, &q, 10);
+                if (q) {
+                        if (*q == '.') q++;
+                        p2 = (const char *)q;
+                }
+
+                if (a1 < a2) return -1;
+                if (a1 > a2) return 1;
+        }
+
+        return 0;
+}
+
+static gboolean
+version_between (const char *v,
+                 const char *lower,
+                 const char *upper)
+{
+        return version_compare (lower, v) <= 0 && version_compare (v, upper) <= 0;
+}
+
+GPtrArray *
+get_release_info (const char *new_version,
+                  const char *old_version)
+{
+        GPtrArray *news;
+        g_autoptr(AsApp) app = NULL;
+        GPtrArray *releases = NULL;
+        unsigned int i;
+        g_autofree char *file = NULL;
+        g_autoptr(GError) error = NULL;
+
+        file = g_build_filename (DATADIR, "appdata", "org.gnome.Recipes.appdata.xml", NULL);
+
+        news = g_ptr_array_new_with_free_func (release_info_free);
+
+        app = as_app_new ();
+        if (!as_app_parse_file (app, file, 0, &error)) {
+                g_warning ("Failed to parse %s: %s", file, error->message);
+                return news;
+        }
+
+        releases = as_app_get_releases (app);
+        for (i = 0; i < releases->len; i++) {
+                AsRelease *rel = g_ptr_array_index (releases, i);
+                ReleaseInfo *ri;
+                const char *tmp;
+
+                if (!version_between (as_release_get_version (rel), old_version, new_version))
+                        continue;
+
+                ri = g_new0 (ReleaseInfo, 1);
+                g_ptr_array_insert (news, -1, ri);
+
+                ri->version = g_strdup (as_release_get_version (rel));
+
+                if (as_release_get_timestamp (rel) > 0)
+                        ri->date = g_date_time_new_from_unix_utc ((gint64) as_release_get_timestamp (rel));
+
+                tmp = as_release_get_description (rel, NULL);
+                if (tmp != NULL)
+                        ri->news = as_markup_convert (tmp, AS_MARKUP_CONVERT_FORMAT_SIMPLE, NULL);
+                else {
+                        g_warning ("Failed to convert markup in %s", file);
+                }
+        }
+
+        return news;
+}
diff --git a/src/gr-appdata.h b/src/gr-appdata.h
new file mode 100644
index 0000000..c05f04a
--- /dev/null
+++ b/src/gr-appdata.h
@@ -0,0 +1,36 @@
+/* gr-appdata.h:
+ *
+ * Copyright (C) 2017 Matthias Clasen <mclasen redhat com>
+ *
+ * Licensed under the GNU General Public License Version 3
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <gtk/gtk.h>
+
+G_BEGIN_DECLS
+
+typedef struct {
+        char *version;
+        GDateTime *date;
+        char *news;
+} ReleaseInfo;
+
+GPtrArray *get_release_info (const char *new_version,
+                             const char *old_version);
+
+G_END_DECLS
diff --git a/src/meson.build b/src/meson.build
index af3108a..cd6b4bb 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -57,6 +57,7 @@ src += ['main.c',
        'gr-about-dialog.c',
        'gr-account.c',
        'gr-app.c',
+       'gr-appdata.c',
        'gr-category-tile.c',
        'gr-chef.c',
        'gr-chef-dialog.c',