From cf4374c4ed58d4b4ace64d95bd24cfb11601b68a Mon Sep 17 00:00:00 2001
From: Rusty Russell <rusty@rustcorp.com.au>
Date: Sat, 16 Jul 2022 22:48:27 +0930
Subject: [PATCH] devtools/rune: simple decode tool.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
---
 devtools/Makefile |  4 ++-
 devtools/rune.c   | 81 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 84 insertions(+), 1 deletion(-)
 create mode 100644 devtools/rune.c

diff --git a/devtools/Makefile b/devtools/Makefile
index 2c32b024b..a18548c66 100644
--- a/devtools/Makefile
+++ b/devtools/Makefile
@@ -1,4 +1,4 @@
-DEVTOOLS := devtools/bolt11-cli devtools/decodemsg devtools/onion devtools/dump-gossipstore devtools/gossipwith devtools/create-gossipstore devtools/mkcommit devtools/mkfunding devtools/mkclose devtools/mkgossip devtools/mkencoded devtools/mkquery devtools/lightning-checkmessage devtools/topology devtools/route devtools/bolt12-cli devtools/encodeaddr devtools/features devtools/fp16
+DEVTOOLS := devtools/bolt11-cli devtools/decodemsg devtools/onion devtools/dump-gossipstore devtools/gossipwith devtools/create-gossipstore devtools/mkcommit devtools/mkfunding devtools/mkclose devtools/mkgossip devtools/mkencoded devtools/mkquery devtools/lightning-checkmessage devtools/topology devtools/route devtools/bolt12-cli devtools/encodeaddr devtools/features devtools/fp16 devtools/rune
 ifeq ($(HAVE_SQLITE3),1)
 DEVTOOLS += devtools/checkchannels
 endif
@@ -48,6 +48,8 @@ DEVTOOLS_COMMON_OBJS :=				\
 
 devtools/features: common/features.o common/utils.o wire/fromwire.o wire/towire.o devtools/features.o
 
+devtools/rune: common/utils.o common/autodata.o common/setup.o common/version.o wire/fromwire.o wire/towire.o devtools/rune.o
+
 devtools/fp16: common/fp16.o common/utils.o common/setup.o common/autodata.o devtools/fp16.o
 
 devtools/bolt11-cli: $(DEVTOOLS_COMMON_OBJS) $(JSMN_OBJS) $(BITCOIN_OBJS) wire/fromwire.o wire/towire.o devtools/bolt11-cli.o
diff --git a/devtools/rune.c b/devtools/rune.c
new file mode 100644
index 000000000..37322e06c
--- /dev/null
+++ b/devtools/rune.c
@@ -0,0 +1,81 @@
+/* Decodes a rune. */
+#include "config.h"
+#include <ccan/err/err.h>
+#include <ccan/opt/opt.h>
+#include <ccan/rune/rune.h>
+#include <common/configdir.h>
+#include <common/setup.h>
+#include <common/utils.h>
+#include <common/version.h>
+#include <stdio.h>
+
+int main(int argc, char *argv[])
+{
+	struct rune *rune;
+	common_setup(argv[0]);
+
+	opt_register_noarg("--help|-h", opt_usage_and_exit,
+			   "<rune>", "Show this message");
+	opt_register_version();
+
+	opt_early_parse(argc, argv, opt_log_stderr_exit);
+	opt_parse(&argc, argv, opt_log_stderr_exit);
+	if (argc != 2)
+		opt_usage_exit_fail("needs rune");
+
+	rune = rune_from_base64(NULL, argv[1]);
+	if (!rune)
+		opt_usage_exit_fail("invalid rune");
+
+	printf("string encoding: %s\n", rune_to_string(rune, rune));
+	for (size_t i = 0; i < tal_count(rune->restrs); i++) {
+		const struct rune_restr *restr = rune->restrs[i];
+		const char *sep = "- ";
+		for (size_t j = 0; j < tal_count(restr->alterns); j++) {
+			const struct rune_altern *alt = restr->alterns[j];
+			if (streq(alt->fieldname, "")) {
+				printf("Unique id is %s", alt->value);
+			} else {
+				printf("%s", sep);
+				switch (alt->condition) {
+				case RUNE_COND_IF_MISSING:
+					printf("%s is missing", alt->fieldname);
+					break;
+				case RUNE_COND_EQUAL:
+					printf("%s equal to %s", alt->fieldname, alt->value);
+					break;
+				case RUNE_COND_NOT_EQUAL:
+					printf("%s unequal to %s", alt->fieldname, alt->value);
+					break;
+				case RUNE_COND_BEGINS:
+					printf("%s starts with %s", alt->fieldname, alt->value);
+					break;
+				case RUNE_COND_ENDS:
+					printf("%s ends with %s", alt->fieldname, alt->value);
+					break;
+				case RUNE_COND_CONTAINS:
+					printf("%s contains %s", alt->fieldname, alt->value);
+					break;
+				case RUNE_COND_INT_LESS:
+					printf("%s < %s", alt->fieldname, alt->value);
+					break;
+				case RUNE_COND_INT_GREATER:
+					printf("%s > %s", alt->fieldname, alt->value);
+					break;
+				case RUNE_COND_LEXO_BEFORE:
+					printf("%s sorts before %s", alt->fieldname, alt->value);
+					break;
+				case RUNE_COND_LEXO_AFTER:
+					printf("%s sorts after %s", alt->fieldname, alt->value);
+					break;
+				case RUNE_COND_COMMENT:
+					printf("comment: %s%s", alt->fieldname, alt->value);
+					break;
+				}
+				sep = " OR ";
+			}
+		}
+		printf("\n");
+	}
+	common_shutdown();
+}