Move components into dedicated subdirectory

This brings us a lot more tidiness.

components/num_files.c

@@ -0,0 +1,30 @@
+/* See LICENSE file for copyright and license details. */
+#include <dirent.h>
+#include <err.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "../util.h"
+
+const char *
+num_files(const char *dir)
+{
+	struct dirent *dp;
+	DIR *fd;
+	int num = 0;
+
+	if ((fd = opendir(dir)) == NULL) {
+		warn("Failed to get number of files in directory %s", dir);
+		return NULL;
+	}
+
+	while ((dp = readdir(fd)) != NULL) {
+		if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
+			continue; /* skip self and parent */
+		num++;
+	}
+
+	closedir(fd);
+
+	return bprintf("%d", num);
+}