[CLI] read topic, priority, etc from environment variables or config file

[kzshantonu]

If a topic, priority, etc is not specified when using ntfy publish, the CLI tool could read value from config file or environment. Could be handy for users who push to one topic most of the time

[binwiederhier]

The syntax for the publish command is this: ntfy publish TOPIC [MESSAGE...], so you could write:

ntfy pub mytopic "my message"
ntfy pub mytopic my message
ntfy pub mytopic   # sends the message "triggered"

Since topic is the first argument, it's quite impossible to leave it blank, e.g. this:

ntfy pub "my message" 

would not work, because the first argument is the topic, not the message. The best I could do is this:

ntfy pub . "my message"  # where . means "use env"

# or this

ntfy pub -T "my message" # where -T means "use env"

but that's super ugly.

Thoughts?

[kzshantonu]

I guess dot is easier to type

[binwiederhier]

Implemented in 1552d81 as

NTFY_TOPIC=mytopic ntfy pub -P "my message"