add simple stats applet

src/Makefile

@@ -24,7 +24,7 @@ endif
 progs-y			+= apk
 apk-objs		:= apk.o add.o del.o fix.o update.o info.o \
 			   search.o upgrade.o cache.o ver.o index.o fetch.o \
-			   audit.o verify.o dot.o policy.o
+			   audit.o verify.o dot.o policy.o stats.o
 
 libapk.so-objs		:= common.o database.o package.o archive.o \
 			   version.o io.o url.o gunzip.o blob.o hash.o print.o \

src/blob.c

@@ -651,7 +651,7 @@ static apk_blob_t atom_hash_get_key(apk_hash_item item)
 	return ((struct apk_blob_atom *) item)->blob;
 }
 
-static struct apk_hash atom_hash;
+struct apk_hash atom_hash;
 static struct apk_hash_ops atom_ops = {
 	.node_offset = offsetof(struct apk_blob_atom, hash_node),
 	.get_key = atom_hash_get_key,

src/stats.c

@@ -0,0 +1,65 @@
+/* stats.c - Alpine Package Keeper (APK)
+ *
+ * Copyright (C) 2013 Timo Teräs <timo.teras@iki.fi>
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation. See http://www.gnu.org/ for details.
+ */
+
+#include <stdio.h>
+#include "apk_defines.h"
+#include "apk_applet.h"
+#include "apk_database.h"
+
+static int list_count(struct list_head *h)
+{
+	struct list_head *n;
+	int c = 0;
+
+	list_for_each(n, h)
+		c++;
+
+	return c;
+}
+
+static int stats_main(void *ctx, struct apk_database *db, struct apk_string_array *args)
+{
+	extern struct apk_hash atom_hash;
+
+	printf(
+		"installed:\n"
+		"  packages: %d\n"
+		"  dirs: %d\n"
+		"  files: %d\n"
+		"  bytes: %zu\n"
+		"  triggers: %d\n"
+		"available:\n"
+		"  names: %d\n"
+		"  packages: %d\n"
+		"atoms:\n"
+		"  num: %d\n"
+		,
+		db->installed.stats.packages,
+		db->installed.stats.dirs,
+		db->installed.stats.files,
+		db->installed.stats.bytes,
+		list_count(&db->installed.triggers),
+		db->available.names.num_items,
+		db->available.packages.num_items,
+		atom_hash.num_items
+		);
+	return 0;
+}
+
+static struct apk_applet stats_applet = {
+	.name = "stats",
+	.help = "Show statistics about repositories and installations",
+	.open_flags = APK_OPENF_READ,
+	.main = stats_main,
+};
+
+APK_DEFINE_APPLET(stats_applet);
+
+