commit 6236025

pick randomly from if given directory

i mean, i can just add this. i have a script sitting around my bin/
that does just this, but since i have my own wallpaper setter, i
might as well add this feature only because i can, and it doesn't
add many lines.

 1@@ -1,8 +1,11 @@
 2 /* See LICENSE file for copyright and license details. */
 3 #include <byteswap.h>
 4+#include <dirent.h>
 5 #include <fcntl.h>
 6 #include <stdbool.h>
 7 #include <sys/mman.h>
 8+#include <sys/stat.h>
 9+#include <time.h>
10 #include <unistd.h>
11 #include <wayland-client-protocol.h>
12 #include <wayland-client.h>
13@@ -410,7 +413,24 @@ main(int argc, char *argv[])
14 		else if (!strcmp(argv[1], "spread")) image_modify = image_spread;
15 		else goto usage;
16 
17-		if (!(image.fp = fopen(argv[2], "rb"))) die("fopen %s:", argv[2]);
18+		struct stat st;
19+		if (stat(argv[2], &st) < 0) die("fopen %s:", argv[2]);
20+
21+		const char *path = argv[2];
22+		struct dirent **namelist = NULL;
23+		int dirn = 0;
24+
25+		if (S_ISDIR(st.st_mode)) {
26+			srand((intptr_t)path | (unsigned int)time(NULL));
27+
28+			if (chdir(path) < 0) die("chdir:");
29+			if (!(dirn = scandir(".", &namelist, NULL, alphasort))) die("scandir:");
30+			if (dirn < 3) die("no images");
31+			path = namelist[rand() % dirn]->d_name;
32+		}
33+
34+		if (!(image.fp = fopen(path, "rb"))) die("fopen %s:", path);
35+		if (namelist) free(namelist);
36 		break;
37 	default:
38 		goto usage;
39@@ -435,7 +455,7 @@ main(int argc, char *argv[])
40 	return EXIT_SUCCESS;
41 
42 usage:
43-	fprintf(stderr, "usage: %s fill|fit|spread|stretch|tile filename\n"
44+	fprintf(stderr, "usage: %s fill|fit|spread|stretch|tile filename|dir\n"
45 	                "       %s RRGGBBAA\n",
46 	        argv[0], argv[0]);
47 	return EXIT_FAILURE;