#include <stdio.h>

#include <alpm.h>
#include <alpm_list.h>

void displaydeps(pmpkg_t *pkg) {
	alpm_list_t *i;

	for(i = alpm_pkg_get_depends(pkg); i; i = alpm_list_next(i)) {
		char *dep = alpm_list_getdata(i);
		printf("%s \n", dep);
	}
}

int main(int argc, char **argv)
{
	pmdb_t *db = NULL;
	alpm_list_t *i;

	if(argc != 2) {
		printf("usage : displaydeps <pkg>\n");
		exit(EXIT_FAILURE);
	}

	if(alpm_initialize() == -1) {
		fprintf(stderr, "cannot initialize alpm: %s\n", alpm_strerror(pm_errno));
		exit(EXIT_FAILURE);
	}

	alpm_option_set_dbpath("/var/lib/pacman");

	db = alpm_db_register_local();
	if(db == NULL) {
		fprintf(stderr, "error: could not register 'local' database (%s)\n",
				alpm_strerror(pm_errno));
		exit(EXIT_FAILURE);
	}

	/* if the package exists, list its dependencies */
	pmpkg_t *pkg = alpm_db_get_pkg(db, argv[1]);
	if(pkg) {
		displaydeps(pkg);
	} else {
		/* otherwise, search for matching packages */
		fprintf(stderr, "error: package %s does not exist\n", argv[1]);
		alpm_list_t *targets = alpm_list_add(NULL, argv[1]);
		alpm_list_t *res = alpm_db_search(db, targets);

		fprintf(stderr, "matching packages : ");
		for(i = res; i; i = alpm_list_next(i)) {
			pmpkg_t *pkg = alpm_list_getdata(i);
			printf("%s \n", alpm_pkg_get_name(pkg));
		}
	}


	if(alpm_release() == -1) {
		fprintf(stderr, "error releasing alpm: %s\n", alpm_strerror(pm_errno));
	}

	exit(EXIT_SUCCESS);
}

/* vim: set ts=2 sw=2 noet: */