Hi all… I’m trying to figure out how to integrate command-line argument processing with mount, and having some trouble with it

My basic idea is that my app starts up and reads a config file config.edn

…and then I parse the command-line via tools.cli and override certain values, like maybe I’ve got a --port 3000 command-line option

So ideally everything looking for the config, eg the web server, just requires [foo.config :refer [app-config]] to get the config

…but I can’t figure out how to set the ns dependency tree up so this is possible

Any ideas?

@timgilbert: have you looked at https://github.com/tolitius/mount#runtime-arguments?

Uh...

edited the link..

Oh, I totally missed that in the README, sorry

all good, let me know how it goes, and/or if you have more questions

Ok, great. Thanks, that’s exactly what I was wondering about

Reading comprehension fail

nah.. the readme is too large, I might need to organize it a bit better

So in this case, I wouldn’t be able to refer to the parsed config from the main ns, right? Otherwise I’d get a circular dependency on config?

do you mean how to refer to the cli args?

I can probably just deal with the processing inside of config, I guess

https://github.com/tolitius/mount/blob/with-args/test/app/config.clj#L8

this is one way

Yeah, so like maybe I define addresses for three deployment environments in the config and the CLI args specify one

Ok, right, so the validation would occur when I’m reconciling the args and the file, that makes sense actually

mount will remember those args, so you can use them to override / create a namespace level config

Ok, I think I see how to proceed. Thanks! mount seems like a great library

great, thanks for the feedback let me know how it goes

I will

btw that branch with the example is from the old mount version, which still makes the example valid, but uses some "older ways", e.g. https://github.com/tolitius/mount/blob/with-args/test/app/config.clj#L2 should be mount.core :refer, etc..