finally put this under version control

mvwt.c

@@ -0,0 +1,58 @@
+#include <stdio.h>
+#include <unistd.h>
+
+#include <sys/stat.h>
+#include <skalibs/sgetopt.h>
+#include <skalibs/stralloc.h>
+#include <skalibs/env.h>
+#include <skalibs/bytestr.h>
+#include <skalibs/strerr.h>
+#include <skalibs/exec.h>
+
+#include "config.h"
+
+#define USAGE "mvwt [-c cachedir] id"
+#define WALLTAKER_URL "walltaker.joi.how"
+
+int
+main(int argc, char *const *argv)
+{
+	int opt;
+	subgetopt l = SUBGETOPT_ZERO;
+	stralloc envmod = STRALLOC_ZERO;
+
+	PROG = "mvwt";
+	const char *cachedir = CACHE_DIR;
+
+	while ((opt = subgetopt_r(argc, (const char * const*) argv, "c:", &l)) != -1) {
+		switch (opt) {
+		case 'c': /* wallpaper cache directory */
+			cachedir = l.arg;
+			break;
+		default:
+			printf("switch %d", argc);
+			strerr_dieusage(100, USAGE);
+			break;
+		}
+	}
+	argc -= l.ind;
+	argv += l.ind;
+	if (argc != 1) {
+		printf("argc %d", argc);
+		strerr_dieusage(100, USAGE);
+	}
+
+	if (chdir(cachedir) < 0)
+		strerr_diefu(111, "chdir to cache dir "
+				"(mkdir it if it doesn't exist)");
+
+	char const *wtc_argv[] = { "s6-tlsclient", "-N", "-Z", "--",
+		WALLTAKER_URL, "443", "mvwtc", argv[0], 0 };
+
+	if (!env_addmodif(&envmod, "CADIR", CADIR_DIR))
+		strerr_diefu(111, "set CADIR");
+
+	xmexec_m(wtc_argv, envmod.s, envmod.len);
+
+	return 111; /* uh oh! */
+}