1 files changed, 76 insertions, 0 deletions
diff --git a/src/applet.c b/src/applet.c
new file mode 100644
index 0000000..1d47662
--- /dev/null
+++ b/src/applet.c
@@ -0,0 +1,76 @@
+/* help.c - Alpine Package Keeper (APK)
+ *
+ * Copyright (C) 2020 Timo Teräs <timo.teras@iki.fi>
+ * All rights reserved.
+ *
+ * SPDX-License-Identifier: GPL-2.0-only
+ */
+
+#include <zlib.h>
+#include "apk_applet.h"
+#include "apk_print.h"
+
+static struct list_head apk_applet_list;
+
+#define apk_applet_foreach(iter) list_for_each_entry(iter, &apk_applet_list, node)
+
+void apk_applet_register(struct apk_applet *applet)
+{
+	list_init(&applet->node);
+	list_add_tail(&applet->node, &apk_applet_list);
+}
+
+void apk_applet_register_builtin(void)
+{
+	extern apk_init_func_t __start_initapplets[], __stop_initapplets[];
+	apk_init_func_t *p;
+
+	list_init(&apk_applet_list);
+	for (p = __start_initapplets; p < __stop_initapplets; p++)
+		(*p)();
+}
+
+struct apk_applet *apk_applet_find(const char *name)
+{
+	struct apk_applet *a;
+
+	apk_applet_foreach(a) {
+		if (strcmp(name, a->name) == 0)
+			return a;
+	}
+	return NULL;
+}
+
+static inline int is_group(struct apk_applet *applet, const char *topic)
+{
+	if (!applet) return strcasecmp(topic, "apk") == 0;
+	if (strcasecmp(topic, applet->name) == 0) return 1;
+	for (int i = 0; applet->optgroups[i] && i < ARRAY_SIZE(applet->optgroups); i++)
+		if (strcasecmp(applet->optgroups[i]->desc, topic) == 0) return 1;
+	return 0;
+}
+
+void apk_applet_help(struct apk_applet *applet, struct apk_out *out)
+{
+#include "help.h"
+
+#ifndef NO_HELP
+	char buf[uncompressed_help_size], *ptr, *msg;
+	unsigned long len = sizeof buf;
+	int num = 0;
+
+	uncompress((unsigned char*) buf, &len, compressed_help, sizeof compressed_help);
+	for (ptr = buf; *ptr && ptr < &buf[len]; ptr = msg + strlen(msg) + 1) {
+		msg = ptr + strlen(ptr) + 1;
+		if (is_group(applet, ptr)) {
+			fputc('\n', stdout);
+			fwrite(msg, strlen(msg), 1, stdout);
+			num++;
+		}
+	}
+	if (num == 0) apk_err(out, "Help not found");
+#else
+	fputc('\n', stdout);
+	apk_err(out, "This apk-tools has been built without help");
+#endif
+}