#clojure – 2015-07-15

2015-07-15

00:16	mercwithamouth	does anyone have an example of connecting to postgres with clojure.java.jdbc
00:16	mercwithamouth	scratch that =P
00:18	mercwithamouth	actually..examples are welcome
00:19	mercwithamouth	i'm using luminus and the sample project but trying to figure out how to make it work with postgres...which i'm also new to
00:32	mercwithamouth	this is what i'm being thrown https://gist.github.com/anonymous/c4f85ad9f3a8792bf846
00:39	mercwithamouth	oooh
00:40	mercwithamouth	profiles.clj =P
01:12	mercwithamouth	anyone ever gotten .DS_Store' does not appear to be a valid migration ?
01:33	noidi	mercwithamouth, that's a file generated by OS X's finder https://en.wikipedia.org/wiki/.DS_Store
01:35	noidi	I guess your migration library expects every file in a particular directory to be a migration
01:38	mercwithamouth	noidi: yeah i just fixed it a few secs ago. i goofed and manually tried to create a migration file opposed to running 'lein migratus create ...' apparently there's some more stuff going on in the background
01:38	mercwithamouth	didn't make any sense =P
06:02	Pupeno	I should use the version 0.1.0-SNAPSHOT should be while developing, then, for release, I should switch that to 0.1.0 and then, when starting developing 0.2.0-SNAPSHOT?
08:24	lodin_	rs0: I went with resource, thanks.
09:53	xificurC	hi, what does one use to build a GUI nowadays? I played around with seesaw quite a while ago, is it still used? The last github commit is from Feb. Any alternatives one can recommend?
11:27	justin_smith	xificurC: I think there's some stuff for javaFX, can't remember any library names
11:28	justin_smith	and figwheel + react with cljs makes a great platform for developing browser based apps, if that's an option
11:34	xificurC	justin_smith: thanks, might check that out
11:42	tmtwd	what is the command in cider to pull in a function in nrepl without having to call (load-file)?
11:44	justin_smith	tmtwd: should be something like cider-eval-defun with a default binding that's something like Control-Alt-x
11:44	tmtwd	justin_smith, cool
11:44	justin_smith	will work with the cursor anywhere inside the form
11:53	csd_	Hi -- what are thoughts on using :pre assertions for type checking? I.e. that an arg is an instance of a certain class
11:56	justin_smith	csd_: better to check that it implements some protocol or interface
11:56	justin_smith	but sure
11:56	justin_smith	also look into prismatic/schema which has it's own version of defn that does type checking
11:57	csd_	but inside a :pre, or inside the code body?
11:57	csd_	like i'm wondering whether its better to throw an exception, or to violate the assertion
11:58	justin_smith	I'd use :pre for things that would be dev errors, (since assertions can be turned off as a runtim optimization), maybe just have regular condition checks and throw exceptions for runtime irregularities that would not be caused by bad code
11:58	justin_smith	:pre creates assertions
11:59	csd_	like, thinking in terms of contracts, my function should only take an instance of class Foo, and from that perspective an assertion makes sense
11:59	justin_smith	right, breaking that would be a code error, not a runtime condition
12:00	justin_smith	but once again, good clojure code should require some protocol or interface, not some class
12:01	csd_	justin_smith: the java object in question doesn't rely on a unique interface
12:01	csd_	should i in that case create a protocol?
12:01	justin_smith	csd_: oh, if it's some specific java object that's up to you
12:02	csd_	yeah its a custom business object. what did you have in mind?
12:02	justin_smith	unless of course it implements some interface, but you shouldn't break your back to fix someone else's bad design, sure
12:03	justin_smith	if you wanted to be extra proper you could make a protocol that abstracts the object and extend it for that object and rest knowing you could be flexible even if the original business object isn't, but really that's probably only marginally useful
12:03	justin_smith	csd_: the advice about coding to protocols/interfaces is more applicable when designing something new
12:03	csd_	yeah
12:03	csd_	ok
12:07	csd_	justin_smith: unrelated other question for you. what do you think about defining fn's as private and then unit testing them by doing something like (def the-fn #'my.ns/the-fn) ?
12:07	justin_smith	csd_: I'm not religious about test coverage, and usually I avoid testing anything that isn't public actually. But I'm probably doing it wrong.
12:28	tmtwd	[org.postgresql/postgresql "9.4-1201-jdbc41"] how would I require this dep in a core.clj file for example?
12:28	tmtwd	I tried [postgresql :as post] but it did not work
12:28	justin_smith	tmtwd: there is no relationship between package names and namespaces provided
12:29	tmtwd	oh
12:29	justin_smith	tmtwd: it defines something like jdbc-postgresql-adaptor that you can use with clojure.java.jdbc
12:29	justin_smith	but your code would almost all reference functions from c.j.jdbc itself
12:29	tmtwd	so I would require jdbc?
12:30	tmtwd	like [clojure.java.jdbc :as sql] ?
12:30	justin_smith	right
12:30	tmtwd	but how would I specify that it is for postgres and not mysql for example?
12:31	justin_smith	and I forget the exact mechanism, but somehow jdbc figures out that you are accessing postgres, and it loads the right adaptor for you
12:31	justin_smith	based on the connection? brb have to do morning standup
12:32	sobel	is there a preferred lib for hiding file url details? i want to get a stream from a local, sftp, or ftp URL
12:51	tmtwd	(defquery "createtables.sql" {:connection db-spec-post}) why is this a bad query for yesql?
12:53	justin_smith	sobel: as far as jvm is concerned, sftp and ftp accessed things are not and cannot be instances of File
12:53	justin_smith	sobel: but you could use a weaker and more abstract concept (like InputStream)
12:55	justin_smith	sobel: I should qualify that. I suspect they can't be File, but there may be a way to do it I don't know of.
12:55	tmtwd	http://pastebin.com/3h9BwtR2 I'm trying to create a db connections and create a db like this, but I'm getting the error that a persistent array cannot be cast to a String
12:55	tmtwd	with yesql
12:56	justin_smith	tmtwd: you are missing the name argument to defquery
12:56	justin_smith	so it things the hash-map (PersistentArrayMap) is supposed to be the file string
12:57	justin_smith	tmtwd: perhaps you meant to use defqueries
12:58	tmtwd	oh I seeee...
12:58	tmtwd	I thought defqueries and defquery did the same thing
14:24	blake_	Welp. I found the source of my problem. I cannot deploy to Wildfly if I don't have ring-jetty-adapter as a dependency.
14:27	justin_smith	wait wat?
14:27	justin_smith	that's super weird
14:32	blake_	It doesn't comport with my understanding of things either.
14:32	jcrossley3	blake_: i concur with justin_smith :)
14:32	blake_	Yet if I have ring-jetty-adapter in my project.clj, the project deploys. If I don't, it does not.
14:33	justin_smith	blake_: does your "wildfly deploy" exist of some construction paper and crayons that say "SeRver" and really it just runs your jar as a standalone?
14:33	blake_	Is it picking up java.servlet with that? I note that I tried all combinations: with servlet, with jetty, with neither.
14:33	blake_	justin_smith: lol...I dunno...how would I tell?
14:34	blake_	(That is CERTAINLY within the realm of possibility, I should say.)
14:34	justin_smith	because a container should not need the jetty-adapter, the jetty-adapter is for when you don't have a container
14:34	justin_smith	"my car only works when I also use a bicycle"
14:35	jcrossley3	yeah, i'm guessing it's pulling in another dep you need. what does 'lein deps :tree' say?
14:35	blake_	Well, maybe that's why I could get it to run locally (after taking out SSL). I thought it was a Widlfly 9 thing but that didn't hold up.
14:35	justin_smith	jcrossley3: oh, that's much more likely than construction paper and crayons
14:36	blake_	rin-jetty pulls in jetty-server, javax.servlet-api (3.1 not 2.5 like I had formerly specified), jetty-http, jetty-util and jetty-io.
14:38	jcrossley3	blake_: none of those with 'jetty' in the name should matter to wildfly, and i would've thought javax libs would already be in the classpath, but maybe not
14:38	jcrossley3	and if that's the problem, there should be some pertinent stack trace in server.log
14:39	blake_	jcrossley3: Well, yeah, there were complaints about javax.servlet. But I also got those when it worked. So.
14:39	blake_	Why don't I need jetty to run using "lein ring server" locally?
14:40	jcrossley3	you do
14:43	blake_	Hmmm. My whole development process has been code, lein ring server, more code, etc. All without explicitly pulling in jetty. That's how the problem arose: I removed jetty at one point and deployments to Wildfly stopped working.
14:43	blake_	Cached?
14:43	justin_smith	blake_: the lein ring plugin should be pulling in the jetty dep
14:44	justin_smith	blake_: so my theory is that you were relying on jetty (via lein ring) and coincidentially there is some transitive dep of the jetty adapter that wildfly actually needs
14:44	justin_smith	so when you add an explicit jetty-adapter dep, that causes the one thing you need (plus a bunch of extra cruft) to deploy
14:45	hiredman	lein ring server uses the lein-ring plugin, which due to this that and the other implicitly adds dependencies on various bits of ring (including ring-jetty, and by extension jetty) when running its tasks, such as lein ring server
14:45	jcrossley3	blake_: lein deps :plugin-tree
14:46	hiredman	plugin-tree likely only works on the transitive dependencies of plugins
14:46	blake_	Hmmm. :plugin-tree shows leinjacker, some clojure.core stuff and data.xml.
14:46	hiredman	of course lein plugins can also throw random stuff in to the projects dependencies while running tasks
14:46	jcrossley3	ah
14:47	hiredman	which is almost certainly how lein-ring works, as do several others (like cljsbuild)
14:47	blake_	So...ring-jetty gets pulled in on the sly, perhaps?
14:48	hiredman	it depends what you mean by on the sly
14:49	blake_	Well, without me having to explicitly state it.
14:49	hiredman	and only for certain things
14:49	hiredman	how are you packaging this project?
14:49	blake_	So, the only thing I can see ring-jetty pulling in that might be needed for Wildfly is java.servlet.
14:49	blake_	lein ring uberwar
14:50	csd_	I want to test a value coming over an async channel. How can I run this value through clojure.test?
14:50	hiredman	right, that should get you ring-servlet, which should get you java.servlet
14:51	blake_	hiredman: But wait, wouldn't that mean I =don't= need the java.servlet pulled in by ring?
14:51	hiredman	https://github.com/ring-clojure/ring/blob/master/ring-servlet/project.clj well actually ring-servlet expects java.servlet to be provided, and since I've never looked in to his before, but have used ring uberwar, it must mean other servlet containers do provide it
14:51	csd_	Only thing I can think of is to do the deftest inside the go loop
14:51	hiredman	blake_: for whatever reason, wildfly must not provide it
14:52	hiredman	(how that is possible, I have no idea)
14:52	blake_	I also had javax.servlet specified! I mean, tried with java.xservlet/servlet-api specified, and no ring-jetty-adapter and it failed.
14:53	justin_smith	csd_: what about a blocking read of a channel in a test but outside the go loop? the test should wait for the read to complete before exiting
14:53	blake_	But with ring-jetty-adapter and no javax.servlet, it worked.
14:53	hiredman	blake_: what do you mean by failed?
14:53	blake_	(That's where I am right now, actually, trying to figure out how to get rid of ring-jetty-adapter.)
14:53	hiredman	was there an error or some exception?
14:53	csd_	justin_smith: but a go block cant ever return anything, can it?
14:54	justin_smith	csd_: go blocks return a channel that will transmit the final value from the go block
14:54	justin_smith	you can block on reading that channel
14:54	csd_	oh never realized that
14:54	blake_	hiredman: Oh, right, sorry. What happens is that it deploys but then when you hit it, the 8443 redirect returns nothing or an error.
14:54	justin_smith	also, if you need more flexibility, you can pass a channel into the go block, then do a blocking read on that channel, arranging to eventually write to the channel in the go block
14:55	hiredman	what does the log say?
14:55	justin_smith	csd_: but the default channel returned by the go block is totally what you should use
14:55	blake_	hiredman: The log doesn't report any errors. Or anything. I get some warnings in deployment but nothing when it's running.
14:55	hiredman	and what do you mean by nothing or an error, those are different things
14:55	csd_	justin_smith: what would the blocking read you're referring to look like? just a <!!?
14:55	hiredman	what warnings do you get in dpeloyment?
14:56	justin_smith	csd_: yup
14:56	justin_smith	csd_: it will prevent the test from returning until the go loop writes to its result channel
14:57	justin_smith	and you can also use the value that <!! returns, obvs.
14:57	csd_	and then juse use an alt with the other channel and (timeout)
14:57	csd_	just*
14:57	justin_smith	sure, if you need that logic, that makes sense
14:57	csd_	thank you
14:58	blake_	hiredman: Not installing org.eclipse.jetty.continuation, Deployment contains CDI annotations but no bean archive.
14:59	hiredman	my wild guess, not supported by any evidence at all is wildfly has a different version of javax.servlet, then the one you explicitly spec'd with your servlet dependency, or the one you implicitly get from lein-ring
15:00	hiredman	if that is the case it may be tricky to fix
15:00	blake_	hiredman: It's better than anything I got. I need to see if I can get it working without the ring jetty.
15:01	blake_	I also think maybe more than one thing is going on here.
15:04	blake_	The "no bean archive" doesn't matter, right?
15:25	blake_	I've broken it again. The deployment is successful but I get an exception "Attempting to call unbound fn: #'myapp.servlet/service-method". I think that might be progress.
15:28	blake_	looks at chat logs, sees exact same error message from 6 days ago...
15:32	TimMc	sobel: You can probably use URI for handling different data sources.
16:02	jcrossley3	blake_: are you saying that with those jetty deps, the 8443 redirect works in wildfly? because that sounds crazy. :)
16:02	blake_	jcrossley3: Well, yeah. That's the way it's been running for months.
16:03	jcrossley3	blake_: without an https-listener configured in wildfly, i respectfully don't believe you
16:04	blake_	jcrossley3: There may well be an https-listener configured in wildfly. (In production. I've got local problems and I just have OOTB wildfly.)
16:05	jcrossley3	blake_: until you know exactly what you have in production, and can replicate it locally, you're just flailing
16:06	blake_	jcrossley3: It's a common situation, unfortunately. They do things in production and keep that from us for "security".
16:06	jcrossley3	blake_: so you may in fact have things correct in your app, but to replicate the behavior in production locally, you'll need to add an https-listener to your OOTB wildfly
16:07	blake_	jcrossley3: Yeah, that's probably my next step.
16:08	jcrossley3	blake_: and for your purposes, you may not even care about https (other than the redirect occurring). it may be simplest to just remove the security-constraint locally
16:10	blake_	jcrossley3: I've done that. The problem for me is that I can't go to deployment and say "It works without security."
16:14	jcrossley3	blake_: you should at least confirm that the https request is hitting wildfly in production, i.e. no reverse proxy, because if it's not, then you absolutely can say that
16:15	blake_	jcrossley3: If I can nail down the problem exactly then, yeah.
16:23	csd_	Maybe someone can understand this behavior. `scheduler.clj` has quartzite boilerplate and defines a simple job. core_test.clj kills any running scheduler, starts the scheduler, and schedules the job, and then listens over an async channel for whether the job was successful. I see that when I make a change to the scheduler file and it refreshes, the test will always fail, but then after i edit the test file, it will succeed again.
16:23	csd_	Any idea what might be going on?
16:23	csd_	i think this has to be due to the test-refresh code
16:24	justin_smith	top level channel definition that is getting redefined?
16:24	blkcat	win 32
16:24	blkcat	oops
16:24	csd_	justin_smith: the channel is being redefined, but its also getting passed to the new job
16:25	justin_smith	hmm
16:25	csd_	it seems like the job never even runs
16:26	justin_smith	csd_: I'd be tempted to defonce an atom holding a vector, then change the job definition so that it always conj's a new timestamp to the end
16:26	justin_smith	the contents might end up being informative
16:29	gfredericks	~defonce is a temptation
16:29	clojurebot	Ok.
16:39	justin_smith	gfredericks:
16:40	justin_smith	it's my sloppy debugging style
16:40	justin_smith	so it does feel like a temptation, or crutch
16:41	gfredericks	oh if it's just debugging then do whatever you want
16:41	gfredericks	my favorite is using (def ...) inside a function
16:41	justin_smith	gfredericks: that'll be my alibi when I murder Donald Trump
16:41	justin_smith	"I was debugging my code, see"
16:42	gfredericks	~justin_smith is a political debugger
16:42	clojurebot	'Sea, mhuise.
16:42	justin_smith	trump dies, code works, you can't explain that
16:44	csd_	justin_smith: sorry, colleague grabbed me. it's gotta be directly related to how test-refresh reloads code
16:49	blake_	Gonna be yoooge.
16:52	atomi	yeah
17:10	lgas	Hi. Can anyone point me to a good library project that's written in 1.7 and uses reader conditionals to provide Clojure and ClojureScript versions that shows how to set up a project.clj appropriately?
17:11	lgas	That is, so that it generates a jar that can be referenced from a clojure or clojurescript project.
17:12	justin_smith	lgas: here's a project that works in clj and cljs https://github.com/littlebird/conduit
17:12	justin_smith	I have been working on it lately (it's an abstraction for passing messages between a client and server)
17:13	justin_smith	lgas: as you'll see, there is not cljc setup in the project.clj at all, just a list of deps
17:13	lgas	Yeah, so everything else just works with the defaults?
17:13	justin_smith	lgas: yes, it just works
17:13	lgas	Hmmm interesting
17:14	justin_smith	as compared to eg. cljx
17:14	justin_smith	because cljc is handled on a language level, by clojure.core itself, so there is no tooling setup needed to make it work at all
17:14	justin_smith	other than using a recent enough clojure of course
17:14	lgas	right
17:16	justin_smith	other than certain tools that need fixing on the implementation level (eg. eastwood), but that's not a config thing at all
17:17	Bronsa	justin_smith: i might be wrong but I think eastwood can't really work with cljc until lein starts using 1.7 by default?
17:17	justin_smith	Bronsa: yeah, I don't think it's strictly eastwood's fault, it's just that the tooling doesn't enumerate cljc files as interesting yet, at some level
17:18	justin_smith	so eastwood is an example of something that doesn't work with cljc yet, is all
17:18	justin_smith	as is lein test
17:18	Bronsa	oh no nevermind. eastwood actually uses tools.reader
17:18	lgas	Yeah I nuked all the cruft I had in my project.clj and just left the deps and it looks like it's working. Awesome. Thanks!
17:19	justin_smith	lgas: I wish the answer was always as simple as "delete all of it and it will work"
17:19	justin_smith	LOL
17:19	lgas	no kidding
17:32	justin_smith	Bronsa: the issue with eastwood is just the part that figures out which files it should be linting, right?
17:34	Bronsa	justin_smith: and the fact that it uses a version of tools.reader that doesn't support reader conditionals
17:34	justin_smith	ahh, so it's deeper than that
17:34	justin_smith	interesting
17:35	Bronsa	justin_smith: yeah needs updated tools.reader and tools.namespace deps
17:35	justin_smith	Bronsa: I keep forgetting tools.reader is not part of core
17:35	Bronsa	justin_smith: it's entirely possible that andyf already updated them btw
17:35	Bronsa	might just need a release
17:36	justin_smith	Bronsa: most recent commits are "small typo in readme" and "mention in readme that 1.7 cljc files are not linted yet"
17:37	Bronsa	oh well then
18:45	weebz	I'm wondering, is there a way to start a secure nREPL on a server so only I can connect to it? I'm having trouble finding anything related to this
18:46	arrdem	weebz: it is possible to tell nrepl to bind to a port or address that's only locally exposed
18:46	Surgo	you could use the box's firewall to limit incoming connections
18:46	Surgo	and just bind to 0.0.0.0
18:46	arrdem	or you could bind to localhost.
18:46	arrdem	but there's nothing I know of that's an auth layer for nREPL
18:47	Surgo	I figured from the question that he wanted to connect remotely
18:47	weebz	Surgo: yes, start the nREPL on my remote server and then connect from my laptop at home
18:47	saimoon44	Hi all, I was wondering is there a way to provide to not use the default template structure of a leiningen project? I want my file containing the main function to be on the same level as the project.clj file. is is possible? Thanks a lot!
18:48	Surgo	I don't know of any auth either but there's some stuff that's on a slightly lower level you could use. You could bind to 0.0.0.0 and use iptables to restrict. Or you could bind to localhost and use a ssh tunnel, or netcat to tie together some connections
18:48	Surgo	ssh tunnel is probably the most secure way :p
18:49	Surgo	http://blog.trackets.com/2014/05/17/ssh-tunnel-local-and-remote-port-forwarding-explained-with-examples.html
18:50	justin_smith	Surgo: by default nrepl won't accept connections from hosts other than localhost
18:50	justin_smith	and yeah, if you need a remote connection, don't do it without a tunnel
18:50	justin_smith	even the localhost thing is a privelege escalation waiting to happen :P
18:51	justin_smith	saimoon44: :src-paths "." but this is a terrible idea, still, because top level namespaces are terrible
18:52	justin_smith	so you should still have some directory structure nesting unless you are evil
18:53	justin_smith	sorry, that's :src-paths ["."]
18:53	saimoon44	justin_smith: oh thanks :) How terrible are they?
18:54	justin_smith	saimoon44: I'm being a bit hyperbolic of course, but don't use top level namespaces for anything that you would expect someone else to use
18:54	justin_smith	saimoon44: also, consider the security implications - if your various paths are inside the top level dir, you can have things in your repo that never end up in a built jar
18:55	justin_smith	saimoon44: if the top level dir is the root of the source path, then all files in your repo will end up in the jar, because they are all on that path
18:55	justin_smith	which could easily have unexpected consequences
18:55	saimoon44	justin_smith: all right, I will look into that, thanks a lot for all the details :)
19:13	tmtwd	can I use figwheel or something similar for use on server side (clj) code?
19:15	justin_smith	tmtwd: ring has wrap-reload which will reload source files when requests come in
19:16	tmtwd	justin_smith, thanks :) I wanted it so I don't have to press f5, but I think I will have to do it with websockets
19:16	justin_smith	I think there are more general auto-refreshing tools too, maybe even some functionality in clojure.tools.namespace
19:16	justin_smith	oh, with websockets ring auto-reload won't help yeah
19:17	justin_smith	but then again, with websockets you wouldn't want to disconnect all your socket connections when you change your code either, so you have to be picky about your reloading (or design things so reloading doesn't break them)
19:51	lodin_	How does future-cancel work? Where can the code be interrupted? If I for instance write to a file in a future and cancel the future, is it possible to end up with half a file?
19:52	arrdem	Using futures for side effects is probably a bad idea... futures as a mechanism are designed for expressing value computations which can occur in parallel.
20:00	lodin_	arrdem: OK. What do you use when you have a couple of concurrent operations with side effects that each return a value when done?
20:00	lodin_	core.async?
20:00	clojurebot	core.async is 100% imperative
20:02	arrdem	lodin_: futues would work here, I'm just concerned that you're thinking about them getting caceled somehow.
20:02	arrdem	damnit Bronsa is probably asleep...
20:03	lodin_	arrdem: I'm specifically thinking that canceling would be bad, but I wonder because it could be good to be able to have any waiting derefs return nil immediately.
20:04	arrdem	lodin_: so if you cancel a future, it will return nil but if the process computing its value has started it will not be killed.
20:05	arrdem	at least that seems to be the behavior.
20:06	amalloy	arrdem: if you cancel a future, an effort is made to stop the process that was computing its value, but there are no guarantees
20:07	lodin_	arrdem: This is what I'm wondering. I haven't found any documentation about this. I think that if you have a Thread/sleep in there, it will listen for interruptions and the thread will be stopped.
20:18	saimoon44	Is there any way to pass options to leiningen from the command line? Like starting a repl with options that you would provide inside project.clj usually (like init-ns) or a new user profile, etc. ?
20:19	arrdem	saimoon44: the :injections keyword is a vector of unquoted code that will get evaluated in the user ns
20:20	pydave6367	Rookie question: say I have two collections [:a :b :c] [1 2 3] and I want to get a list of maps out of them: [{:a 1} {:b 2} {:c 3}]. Is there an easy/idiomatic way to do that?
20:20	kristof	arrdem: Sounds invasive.
20:21	arrdem	pydave6367: (map #(assoc nil %1 %2) keyvec valvec)
20:21	saimoon44	arrdem: but can you provide this on the command line? Or do you have to write into a file anytime you want to pass some different args?
20:22	pydave6367	arrdem: Thank you so much! Been wrestling with that one for a while!
20:23	arrdem	saimoon44: you can set that in the project.clj, alternatively you can write a user.clj file. If you want to manually invoke the Clojure jar I've seen a way to add an expression to be evaluated at the command line lemme dic for it.
20:24	lodin_	pydave6367, arrdem: Or (map hash-map keyvec valvec).
20:25	noncom\|2	,(keyword "heeeeeey that's rather cool!")
20:25	clojurebot	:heeeeeey that's rather cool!
20:25	saimoon44	arrdem: yeah I have heard of this user.clj file thing, it is still a file with conventional path I guess, is there any way to provide from the command line a specific file to be read to overrride it?
20:26	arrdem	saimoon44: no. clojure.core is hard wired to read user.clj if it exists
20:26	noncom\|2	,(symbol ":so, generally isn't that really wonderful::::")
20:26	clojurebot	:so, generally isn't that really wonderful::::
20:26	lodin_	(Or maybe array-map even since it's small.)
20:26	kaiyin	is there way to autocomplete file paths in cursive? in vim it's c-x c-f.
20:28	saimoon44	oh this is clojure thing? I would have thought this was coming from leiningen
20:32	saimoon44	Ok, well thanks arrdem, too bad that nothing can be provided to override repl options and such from the command line
20:36	pydave6367	lodin_: That's nice. I totally missed that. Thank you!
20:46	danielpcox	does anyone know what it means if you get this exception while using proxy? https://github.com/clojure/clojure/blob/master/src/clj/clojure/core_proxy.clj#L24 I was trying to make a proxy object of a Scala abstract class, and I got "Incompatible return types".
21:27	danielpcox	I found an example in the standard scala libs:
21:27	danielpcox	(import scala.collection.immutable.StringOps)
21:27	danielpcox	=> scala.collection.immutable.StringOps
21:27	danielpcox	(proxy [StringOps] [])
21:27	danielpcox	Exception Incompatible return types clojure.core/most-specific (core_proxy.clj:23)
21:34	lvh	I'm getting a weird compilation error: java.lang.ClassNotFoundException: taoensso.sente, compiling:(taoensso/sente.clj:1144:5)
21:34	lvh	I don't understand what it means for the class not to be found while compiling the clj file itself?
21:35	lvh	Here's the full stacktrace, but it doesn't really seem to help: https://gist.github.com/lvh/1eace2ad8963f12212cf
21:35	gfredericks	it probably doesn't mean that there is supposed to be such a class
21:36	gfredericks	(like if everything were working correctly)
21:36	gfredericks	it's probably clojure misinterpreting a symbol like taoensso.sente/foo for some reason
21:39	lvh	gfredericks: Huh, okay. How do I debug that? I think I know which ns is causing it, but I can't figure out what it's doing that the compiler doesn't like.
21:41	gfredericks	I think if you try to use a fully qualified symbol w/o requiring the ns you'd get that msg
21:41	gfredericks	,taoensso.symbol/foo
21:41	clojurebot	#error {\n :cause "taoensso.symbol"\n :via\n [{:type clojure.lang.Compiler$CompilerException\n :message "java.lang.ClassNotFoundException: taoensso.symbol, compiling:(NO_SOURCE_PATH:0:0)"\n :at [clojure.lang.Compiler analyze "Compiler.java" 6543]}\n {:type java.lang.ClassNotFoundException\n :message "taoensso.symbol"\n :at [java.net.URLClassLoader$1 run "URLClassLoader.java" 366]}]\n :tra...
21:41	gfredericks	^ yep
21:42	gfredericks	might be other ways to get it, I don't know
21:42	lvh	hm
21:44	hiredman	lvh: the name of a namespace is not bound to anything
21:44	tmtwd	do lispers dislike yesql?
21:44	hiredman	,ns
21:44	clojurebot	#object[clojure.lang.Namespace 0x627ae8af "sandbox"]
21:44	hiredman	,sandbox
21:44	clojurebot	#error {\n :cause "Unable to resolve symbol: sandbox in this context"\n :via\n [{:type clojure.lang.Compiler$CompilerException\n :message "java.lang.RuntimeException: Unable to resolve symbol: sandbox in this context, compiling:(NO_SOURCE_PATH:0:0)"\n :at [clojure.lang.Compiler analyze "Compiler.java" 6543]}\n {:type java.lang.RuntimeException\n :message "Unable to resolve symbol: sandbox i...
21:44	hiredman	^-
21:45	hiredman	but most namespace names contain dots, with the clojure compiler uses as a heuristic to decide if it should try and treat a name as a class reference
21:46	hiredman	so somewhere in the sente.clj (most likely at the line and column given in the error) you will have the symbol taoensso.sente
21:46	hiredman	(or you have some badly written macro generating it)
21:47	lvh	hiredman: OK, but the file it's attempting to compile just requires [taoensso.sente :as sente] and only uses sente/whatever, so, hm
21:47	hiredman	you are looking in the wrong file
21:47	lvh	the thing I get the error about is from compiling upstream's sente.clj
21:47	lvh	okay
21:48	lvh	Huh, why isn't sente in ~/.m2/repository?
21:49	TEttinger	under taoensso ?
21:49	lvh	TEttinger: nope
21:49	lvh	oh, com.taoensso
21:49	hiredman	do you have a compelling reason to use sente?
21:49	TEttinger	(also it doesn't necessarily correspond to ns, it's the maven artifact naming)
21:50	lvh	hiredman: it seemed like the easiest thing to accomplish what I wanted (push events to the browser)
21:50	lvh	also, it worked fine before, and I'm not sure what broke it, so I guess I'll git bisect
21:53	lvh	1.6.0-beta1 works like a charm, so I guess it's a sente bug?
21:55	Niac	HOW to write a php interpretor with clojure?
21:56	lvh	Niac: You want to write one from scratch?
21:57	Niac	lvh: yes
21:58	Niac	lvh: just some basic caculation
21:58	lvh	Niac: OK, so first figure out how to tokenize and parse (instaparse will probably serve you nicely if you only care about the basics)
22:00	lvh	Niac: then, you want to match on expressions and execute the equivalent clojure expression
22:00	Niac	lvh: yes
22:01	lvh	Niac: so, for example, if your parser turns "5 + 1;" into '[5 + 1], you can write e.g. a core.match rule to match on that and do (+ x y) instead.
22:01	lvh	(You'd probably want to recursively match so that you can also parse "5 + 1 + 1;")
22:02	hiredman	(of course the semantics won't be phps, just the surface syntax)
22:02	Niac	lvh: what about
22:02	Niac	Function scope
22:03	lvh	Niac: I don't know enough about PHP's scoping rules to give you a sensible answer there; sorry.
22:05	Niac	lvh: maybe you can tell me scope in the semantics
22:05	Niac	lvh: just about the mind
22:24	TEttinger	Niac: it does not sound like a quick or easy project, unless you choose a very small subset of PHP
22:25	Niac	TEttinger: yes ,just the basic part
22:26	TEttinger	such as?
22:27	TEttinger	do you want to be able to define variables or functions, and would they behave with PHP's bizarre conversion rules or Clojure's more normal ones?
22:27	TEttinger	"" + 5
22:28	TEttinger	in php, I believe that may return "5", in clojure it's an error even after you turn it into (+ "" 5)
22:31	Niac	TEttinger: that's a problem i never thought
22:35	Niac	TEttinger: in my way,when do the plus caculation , a string is for zero
22:35	TEttinger	err, nevermind, PHP does not overload +, I was thinking of JS or possibly PHP
22:35	TEttinger	err, nevermind, PHP does not overload +, I was thinking of JS or possibly PHP's equality stuff
22:36	TEttinger	in PHP: NULL < -1, and NULL == 0. Sorting is thus nondeterministic; it depends on the order in which the sort algorithm happens to compare elements.
22:37	TEttinger	http://phpsadness.com/sad/47
22:40	TEttinger	I'm getting most of this from http://eev.ee/blog/2012/04/09/php-a-fractal-of-bad-design/
22:47	TEttinger	Incrementing (++) a NULL produces 1. Decrementing (--) a NULL produces NULL. Decrementing a string likewise leaves it unchanged.
23:45	bcham	Likely a stupid question, but would you ever defmacro a macro that returns a function? I just tried one
23:45	bcham	and I got an error when I tried to use it saying that I was using a reserved name (and I definitely wasn't)
23:45	bcham	any ideas?
23:51	whomp	is there a function which returns true if the element passed in is truthy, i.e. neither nil nor false?
23:52	lvh	whomp: I'm not sure, but #(if % true false) <= looks like it does what you want obv :)
23:52	whomp	lvh, true :)
23:52	whomp	ty
23:52	lvh	whomp: heh heh heh
23:52	lvh	,(boolean "abcd")
23:52	clojurebot	true
23:53	lvh	whomp: I guess boolean does what you want?
23:53	whomp	oh cool, never knew that one
23:53	whomp	that's perfect
23:55	lvh	I wasn't sure if that's plain-old Java coercion or Clojure truthiness
23:55	lvh	,(boolean nil)
23:55	clojurebot	false
23:55	lvh	,(boolean [])
23:55	clojurebot	true
23:56	lvh	looks about right though :)