#include "config.h"
#include <stdio.h>
#include <string.h>

/**
 * ungraph - extract a graph from an ASCII diagram.
 *
 * This code takes an ASCII diagram and converts it to a graph.
 * The following things are assumed:
 * 1. The input consists of \n-terminated lines
 * 2. /-\|+ are used for edges.
 * 3. <^>v are used for arrowheads.
 * 4. + can be used to cross-over.
 * 5. No arrowheads or both-ended arrowheads are shortcuts for "both ways".
 * 6. Edges can turn with or without a +, by up to 90 degrees.
 * 7. Edges must go from one node name to another.
 * 8. Any other text is an edge label which must be next to an edge or
 *    another label.
 *
 * License: BSD-MIT
 * Example:
 * // Convert an ASCII graph to Graphviz dot format
 * #include <ccan/err/err.h>
 * #include <ccan/grab_file/grab_file.h>
 * #include <ccan/ungraph/ungraph.h>
 *
 * // Just return the name as our node.
 * static void *add_node(const tal_t *ctx,
 *                       const char *name,
 *                       const char **errstr,
 *                       void *unused)
 * {
 *         return (void *)name;
 * }
 *
 * static const char *add_edge(const tal_t *ctx,
 *                             void *source_node,
 *                             void *dest_node,
 *                             bool bidir,
 *                             const char **labels,
 *                             void *arg)
 * {
 *         printf("%s -> %s;\n", 
 *                (char *)source_node, (char *)dest_node);
 *         if (bidir)
 *                 printf("%s -> %s;\n", 
 *                        (char *)dest_node, (char *)source_node);
 *         return NULL;
 * }
 *
 * int main(int argc, char *argv[])
 * {
 *         const char *graph = grab_file(NULL, argv[1], NULL), *errmsg;
 *	   printf("digraph %s {\n", argv[1] ? argv[1] : "stdin");
 *         errmsg = ungraph(NULL, graph, add_node, add_edge, NULL);
 *         if (errmsg)
 *                 errx(1, "%s", errmsg);
 *         printf("}");
 * }
 *
 * Author: Rusty Russell <rusty@rustcorp.com.au>
 */
int main(int argc, char *argv[])
{
	/* Expect exactly one argument */
	if (argc != 2)
		return 1;

	if (strcmp(argv[1], "depends") == 0) {
		printf("ccan/tal\n");
		printf("ccan/tal/str\n");
		printf("ccan/typesafe_cb\n");
		return 0;
	}

	return 1;
}