feat(tarot): occasionally reverse

configs/tarot.nix

@@ -14,14 +14,22 @@ in
     script = ''. ${pkgs.writers.writeDash "tarot" ''
       case "$Method $Request_URI" in
         "GET /")
-          if item=$(find ${toString tarotFiles} -type f | shuf -n1); then
+          if item=$(${pkgs.findutils}/bin/find ${toString tarotFiles} -type f | ${pkgs.coreutils}/bin/shuf -n1); then
+            card=$(mktemp --tmpdir tarot.XXX)
+            trap 'rm $card' EXIT
+            reverse=$(${pkgs.coreutils}/bin/shuf -i0-1 -n1)
+            if [ "$reverse" -eq 1 ]; then
+              ${pkgs.imagemagick}/bin/convert -rotate 180 "$item" "$card"
+            else
+              ${pkgs.coreutils}/bin/cp "$item" "$card"
+            fi
             printf 'HTTP/1.1 200 OK\r\n'
-            printf 'Content-Type: %s\r\n' "$(file -ib $item)"
+            printf 'Content-Type: %s\r\n' "$(${pkgs.file}/bin/file -ib "$card")"
             printf 'Server: %s\r\n' "$Server"
             printf 'Connection: close\r\n'
-            printf 'Content-Length: %d\r\n' $(wc -c < $item)
+            printf 'Content-Length: %d\r\n' $(${pkgs.coreutils}/bin/wc -c < "$card")
             printf '\r\n'
-            cat $item
+            cat "$card"
             exit
           fi
         ;;