1 files changed, 43 insertions, 0 deletions
diff --git a/src/help.c b/src/help.c
new file mode 100644
index 0000000..a27992a
--- /dev/null
+++ b/src/help.c
@@ -0,0 +1,43 @@
+/* help.c - Alpine Package Keeper (APK)
+ *
+ * Copyright (C) 2020 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 <zlib.h>
+#include "apk_applet.h"
+#include "apk_print.h"
+
+static 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]->name, topic) == 0) return 1;
+	return 0;
+}
+
+void apk_help(struct apk_applet *applet)
+{
+#include "help.h"
+
+	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_error("Help not found");
+}