#clojure – 2015-02-13

2015-02-13

18:14	rhg135	edit the output of (into {} (for [[s v] (ns-publics 'clojure.core)] [s (deref v)]))
18:14	justin_smith	that's one way to do it, heh
18:29	nicferrier	anyone know about logging?
18:29	justin_smith	nicferrier: timbre makes it pretty easy
18:29	nicferrier	I'd like to alter the format of my logging messages... seems to be less popular than in java
18:30	nicferrier	justin_smith: I guess I'll look. I'm a bit worried about dependencies...
18:30	justin_smith	the deps list on timbre is really small
18:31	justin_smith	anyway, you can also use properties files or xml and use the standard java logging config
18:31	justin_smith	but timbre is much more clojure-friendly
18:32	nicferrier	timbre does look good. I didn't mean I was worried about timbre's deps. but about me adding deps.
18:33	nicferrier	I am inside a regulated environment where they regulate the software we use.
18:33	nicferrier	which means I have to have every tiny bit of code I use approved.
18:33	nicferrier	which means I am sad and angry a lot of the time.
18:33	justin_smith	oh, I can imagine
19:28	raspasov	does anyone know if using (apply + [1 2 3]) has a performance overhead compared to pure (+ 1 2 3)
19:28	raspasov	?
19:29	justin_smith	raspasov: check out the source for +
19:29	hiredman	yes
19:29	raspasov	justin_smith: I'm talking about any IFn in general, not only +
19:29	raspasov	i.e. is the performance overheard "just" the creation of the vector, or there's more?
19:30	justin_smith	raspasov: different functions handle multiple args differently, but apply by itself does not have a very large overhead
19:30	raspasov	justin_smith: ok, thanks, I guess I should benchmark (as always) lol
19:31	justin_smith	yeah, can't hurt to throw your code at criterium/bench
19:31	cddr	nicferrier: Congrats on sneaking clojure into that environment
19:32	nicferrier	cddr: thanks.
19:32	nicferrier	we are sneaking too.
19:36	nicferrier	still not many examples of how to configure a log instance with timbre
19:36	nicferrier	lots on the logging config... nothing on how to do it.
19:37	justin_smith	nicferrier: timbre/set-config!
19:37	nicferrier	yeah... but I want to change the format of the logger. no example.
19:37	justin_smith	and that config ends up altering the behavior of logging
19:37	justin_smith	it's a single global atom
19:37	nicferrier	this is a stackoverflow world. I need to cut and paste.
19:37	nicferrier	:-)
19:37	justin_smith	haha
19:39	nicferrier	gotta crash now anyway. too tired to work it out.
20:05	raspasov	just saw this for the first time: java.lang.IllegalArgumentException: fns taking primitives support only 4 or fewer args
20:05	raspasov	any idea why that is? :)
20:06	justin_smith	raspasov: combinatorial explosion of required declarations in the java source
20:06	justin_smith	so you are limited to 4
20:06	raspasov	makes sense :)
20:18	justin_smith	raspasov: you can see something similar for java methods that support primitives - each combo of primitives must be a separate method declaration
20:19	raspasov	justin_smith: thanks
22:11	vas	so I have been working on an app using compojure and ring and it's going pretty well, but every time I change an HTML file it seems like I must restart my server. Or do these automagically refresh and it's just the browser at fault?
22:12	justin_smith	vas: you are refreshing the pages but not seeing the new content?
22:13	vas	truth
22:13	ianhedoesit	do you have any errors in the program?
22:13	justin_smith	vas: how do you start the ring server?
22:14	vas	justin_smith: lein ring server-headless
22:14	justin_smith	vas: typically what is needed is to use #'handler instead of handler as the argument passed to the ring server on startup
22:14	vas	justin_smith: interesting. i've seen that in some source but didn't know what it was for.
22:14	vas	ianhedoesit: i love your question, but i'm afraid i can't answer it. xD
22:14	justin_smith	vas: but this won't matter if you are using lein-ring
22:15	justin_smith	vas usually lein-ring server will automatically put everything inside a wrap-reload
22:15	vas	everything compiles fine, it's just that when I edit an html file, save it, and refresh the page, i don't see the changes. but now it seems more likely that it is firefox just caching things even when i have it set to not do that
22:16	vas	yeah, i was wondering if wrap-reload would be the solution. if lein does that already then awesome. it's not a big deal, just a minor glitch in the matrix of workflow
22:16	justin_smith	vas: so you are directly serving the html, and not rendering it from the handler functions?
22:17	vas	justin_smith: both. using enlive to sexify the template html.
22:18	justin_smith	vas: wrap-reload will be smart enough to redef things if your source files change, but it may not be able to automatically update things if your templates change
22:18	justin_smith	are you re-reading the templates, or loading them once?
22:18	vas	interestingly: the enlive tranforms always appear up-to-date, but the template html does not.
22:19	justin_smith	vas: are you reloading the template file on each run, or are they captured in eg. a top level def?
22:19	amalloy	yeah, i'd bet like $20 justin_smith is on the right track here
22:20	vas	justin_smith: they're in a top level def. gives $20 ...
22:20	vas	how would i make it so that they get reloaded automagically ? o.o
22:20	justin_smith	vas: tell wrap-reload to watch those files
22:20	justin_smith	use a function that memoizes, but reloads them if they change modification date
22:21	justin_smith	unconditionally reload them on every request under dev profile
22:21	justin_smith	you have a few options
22:22	vas	justin_smith: super cool! thank you.
22:23	vas	so I can just give wrap-reload a directory to watch?
22:24	vas	https://github.com/ring-clojure/ring/blob/8927e9b3f556874720321078c85a62fcf9a23f1b/ring-devel/src/ring/middleware/reload.clj
22:24	justin_smith	vas: as I mentioned, wrap-reload is in there by default
22:24	justin_smith	but I think there is a way to give it parameters when using lein ring
22:24	vas	Aha.
22:25	justin_smith	vas: https://github.com/weavejester/lein-ring#web-server-options
22:25	justin_smith	you want to set :reload-paths
22:27	vas	hrm. seems like the behavior i'm wanting is the default. some detective work to do
22:27	justin_smith	the html files are in your classpath?
22:29	vas	i think so. they are all in the /resources dir how would i verify what my classpath encompasses?
22:30	justin_smith	yeah, resources is usually on the classpath (via resource-path)
22:30	justin_smith	it could also be that wrap-reload isn't watching all filetypes?
22:31	justin_smith	the docs say it only defaults to ["src"]
22:31	justin_smith	https://ring-clojure.github.io/ring/ring.middleware.reload.html
22:31	justin_smith	try providing ["src" "resources"] for a lark, see if that helps
22:39	vas	justin_smith: so I added wrap-reload ["src" "resources"] to my def app -> thread-through, restarted my lein server, and attempted to add a simple <span> element to one of the html source files to see what would happen... no dice
22:41	justin_smith	vas: lein ring server was already using wrap-reload
22:41	justin_smith	or did you turn it off on the project.clj?
22:41	vas	na i didn't turn it off. but you are saying that i should just pass those arguments to the lein invocation on the command line somehow?
22:42	justin_smith	vas: look at the docs I linked above in that github readme
22:42	justin_smith	you can specify the args there
22:43	justin_smith	you don't want wrap-reload in your app's source, because it's only useful during dev and shouldn't be present in production
22:43	TEttinger	(inc justin_smith)
22:43	lazybot	⇒ 186
22:46	vas	justin_smith: thanks. i am not sure what it looks like to pass leiningen different args from the command line, but i guess i have some learning to do :]
22:46	justin_smith	vas: it's an option you provide inside project.clj
22:46	vas	Ohhh. cool.
22:47	justin_smith	vas: so in project.clj: :ring {:reload-paths ["src" "resources"]}
22:48	justin_smith	}
22:48	justin_smith	err wait that wasn't even needed