Usage: titan-upload.sh [-c CERT_FILE] [-k KEY_FILE] [-t TOKEN] [-m MIMETYPE] URI [FILE]

Upload FILE to titan uri URI.
If FILE is omitted, create file in $EDITOR then upload.
If FILE is -, it will be read from standard input.

If -m is not used, the mimetype will be:
* text/gemini if FILE ends in .gmi or if FILE was omitted or was -;
* determined using the 'file' command otherwise.

Paths to a client certificate and its private key may optionally be provided,
using either environment variables CLIENT_CERT and CLIENT_KEY,
or the -c and -k options (which take priority over variables).