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clojurians | clojure | yeah, waiting for all the pings is weird if the pings are looping… | 2017-12-11T16:25:37.000219 | Margaret |
clojurians | clojure | well, is there any way to pass reference futre itself to ping-host? | 2017-12-11T16:26:43.000066 | Lois |
clojurians | clojure | so I have all futures references and kill them all from outside | 2017-12-11T16:27:25.000016 | Lois |
clojurians | clojure | maybe you want core.async or something - it sounds like your flow of data / execution design is still fuzzy? | 2017-12-11T16:28:22.000283 | Margaret |
clojurians | clojure | because if there’s a loop in a future, what does someone wait on when waiting on a ping? | 2017-12-11T16:28:38.000715 | Margaret |
clojurians | clojure | It´s in that way because I have to compare all the results with each other | 2017-12-11T16:29:21.000466 | Lois |
clojurians | clojure | but if it’s a loop you have multiple results to compare - | 2017-12-11T16:29:55.000125 | Margaret |
clojurians | clojure | the loop is only when waiting ssh session until ends | 2017-12-11T16:31:13.000437 | Lois |
clojurians | clojure | If I understand what you mean :slightly_smiling_face: | 2017-12-11T16:31:49.000360 | Lois |
clojurians | clojure | so really what you want is one function that simultaneously opens an ssh connection and also loops on a ping, and then based on the ping time conditionally restarts the ssh connection? | 2017-12-11T16:32:58.000034 | Margaret |
clojurians | clojure | so one thread does `(ssh host)` and the other does `(when (ping-takes-longer host reference) (restart-ssh host))` ? | 2017-12-11T16:33:37.000723 | Margaret |
clojurians | clojure | this is happening already, I want to know how to stop it when it´s runnig, any time I want | 2017-12-11T16:34:23.000720 | Lois |
clojurians | clojure | so the thread you want to cancel isn’t the ping, it’s the ssh | 2017-12-11T16:35:23.000118 | Margaret |
clojurians | clojure | I´m saying ping and ssh because it´s remote ssh ping | 2017-12-11T16:36:13.000156 | Lois |
clojurians | clojure | I have to ssh to some router/firewall and get the output ping from it | 2017-12-11T16:37:21.000577 | Lois |
clojurians | clojure | this is working already, but I have stop control from outside | 2017-12-11T16:38:04.000646 | Lois |
clojurians | clojure | that came from kill sign | 2017-12-11T16:38:24.000705 | Lois |
clojurians | clojure | then store the future somewhere that the code that wants to cancel can call `cancel-future` on it? | 2017-12-11T16:38:41.000132 | Margaret |
clojurians | clojure | yes, but how can I get the references of `futres` from that maps? | 2017-12-11T16:39:33.000326 | Lois |
clojurians | clojure | `(->> ["<http://www.google.com|www.google.com>" "<http://www.microsoft.com|www.microsoft.com>"] (mapv #(future (ping-host %))) (mapv #(deref %)))` using other function outside future? | 2017-12-11T16:41:32.000006 | Lois |
clojurians | clojure | `(->> ["<http://www.google.com|www.google.com>" "<http://www.microsoft.com|www.microsoft.com>"] (mapv #(store-future (future (ping-host %)))) (mapv #(deref %)))` ? | 2017-12-11T16:41:56.000772 | Lois |
clojurians | clojure | you need a let block to get the future itself | 2017-12-11T16:43:21.000163 | Margaret |
clojurians | clojure | `(let [hosts ["<http://www.google.com|www.google.com>" "<http://www.microsoft.com|www.microsoft.com>"] futures (mapv #(future (ping-host %)) hosts)] {:futures futures :results (mapv deref futures)})` | 2017-12-11T16:44:35.000140 | Margaret |
clojurians | clojure | that way you can get results you can check, and also the futures | 2017-12-11T16:44:45.000533 | Margaret |
clojurians | clojure | yes, you right, but I have to use some atom passed from outside to use it in other stoping function. Thanks alot | 2017-12-11T16:47:04.000240 | Lois |
clojurians | clojure | ```
(defn update-something [stack f]
(conj (pop stack) (f (peek stack))))
```
how should I name this function? neither -last nor -first makes sense since stack can either be list or vector | 2017-12-11T17:18:14.000601 | Berry |
clojurians | clojure | update-top ? is that the best? | 2017-12-11T17:18:26.000206 | Berry |
clojurians | clojure | <@Berry> poke? | 2017-12-11T17:21:51.000394 | Bibi |
clojurians | clojure | or some combination of that with another word | 2017-12-11T17:22:09.000293 | Bibi |
clojurians | clojure | In case anyone cares, I’ve submitted a pull request to `twitter-api` that adds support for `media/upload`, including chunked upload, which means you can now post tweets with images, videos and animated gifs from clojure: <https://github.com/adamwynne/twitter-api/pull/77> | 2017-12-11T19:49:26.000290 | Alline |
clojurians | clojure | so i notice that my code has this pattern around quite a bit
```(if (some? x)
(do-stuff x)
x)```
what's the idiomatic way to address this more elegantly ? am i simply oblivious to a function that exists for this ? | 2017-12-12T02:49:43.000040 | Catharine |
clojurians | clojure | i guess ```(some-> x do-stuff)``` does the trick ? | 2017-12-12T02:50:34.000019 | Catharine |
clojurians | clojure | `some?` returns true if its argument isn't nil … depends on whether you really care about nil or logical false. If logical false is ok:
```(when x
(do-stuff x))```
also works | 2017-12-12T03:32:12.000034 | Buck |
clojurians | clojure | it will return nil in the case where the test doesn't return logical true, so be aware of that ... | 2017-12-12T03:32:51.000207 | Buck |
clojurians | clojure | Your else case always returns nil here I guess, so there's that. | 2017-12-12T03:42:50.000062 | Jodie |
clojurians | clojure | yeah i think i gave a bit wrong example | 2017-12-12T03:43:26.000167 | Catharine |
clojurians | clojure | <http://clojuredocs.org/clojure.core/when-some>
This is useful if there's an expression involved | 2017-12-12T03:43:53.000302 | Jodie |
clojurians | clojure | i think this better illustrates the pattern:
```(if (condition x)
(do-stuff x)
x)``` | 2017-12-12T03:44:03.000401 | Catharine |
clojurians | clojure | i ended up rewriting this as
```(cond-> x
(condition x)
(do-stuff))``` | 2017-12-12T03:45:25.000242 | Catharine |
clojurians | clojure | Struggling to get `clj` / tools.deps to work, getting: `Error building classpath. Unknown coordinate type for org.clojure/clojure: {:type :mvn, :version "1.8.0"}` Anyone know why that could be? | 2017-12-12T04:15:19.000164 | Renata |
clojurians | clojure | Yeah, I find myself doing that a lot, don't like it either. | 2017-12-12T04:35:47.000372 | Jodie |
clojurians | clojure | <@Renata> what's your command line? | 2017-12-12T04:36:18.000055 | Fe |
clojurians | clojure | and your deps.edn? | 2017-12-12T04:36:38.000454 | Fe |
clojurians | clojure | There's a macro by a JUXTer called condas-> which solves this a little I think. | 2017-12-12T04:36:43.000053 | Jodie |
clojurians | clojure | <@Fe> just `clojure` or `clj`. I do have a deps.edn which contains this:
```
{:deps
{clj-time {:mvn/version “0.14.2”}}}
``` | 2017-12-12T04:36:48.000283 | Renata |
clojurians | clojure | does it work from an empty directory? | 2017-12-12T04:37:05.000143 | Fe |
clojurians | clojure | (which is copied from the guide) | 2017-12-12T04:37:09.000076 | Renata |
clojurians | clojure | same error in empty directory | 2017-12-12T04:37:29.000408 | Renata |
clojurians | clojure | is it the latest version? (`brew upgrade clojure`) | 2017-12-12T04:37:31.000250 | Fe |
clojurians | clojure | I did reinstall / make sure it’s up to date | 2017-12-12T04:37:54.000011 | Renata |
clojurians | clojure | what's the output of `clojure -Sverbose` | 2017-12-12T04:38:04.000156 | Fe |
clojurians | clojure | (also `which clojure`) | 2017-12-12T04:38:12.000085 | Fe |
clojurians | clojure | check the files in ```config_paths = /usr/local/Cellar/clojure/1.8.0.193/deps.edn /Users/me/.clojure/deps.edn deps.edn``` | 2017-12-12T04:38:31.000115 | Fe |
clojurians | clojure | you may need to delete `~/.clojure` | 2017-12-12T04:38:40.000248 | Fe |
clojurians | clojure | that was it, thanks! | 2017-12-12T04:38:56.000469 | Renata |
clojurians | clojure | :information_desk_person: | 2017-12-12T04:39:01.000316 | Fe |
clojurians | clojure | I looked for the user config but didn find it (thought I never created one so probably just didn’t look hard enough) | 2017-12-12T04:39:34.000328 | Renata |
clojurians | clojure | Would be nice if the error indicated which file the error comes from | 2017-12-12T04:40:02.000393 | Renata |
clojurians | clojure | The config is an overlay of the 3 edn files laid on top of each other, so this might be difficult | 2017-12-12T04:40:33.000042 | Fe |
clojurians | clojure | But maybe it could say "Error: ... - the config files used were x, y and z" | 2017-12-12T04:42:18.000257 | Fe |
clojurians | clojure | yeah I guess that would already be a good improvement | 2017-12-12T04:43:11.000026 | Renata |
clojurians | clojure | there's <https://dev.clojure.org/jira/browse/TDEPS> | 2017-12-12T04:43:34.000156 | Fe |
clojurians | clojure | <@Fe> do you know if the `clj` command does any preprocessing of the deps.edn file? | 2017-12-12T04:47:15.000348 | Renata |
clojurians | clojure | ```
(tools-deps/resolve-deps (read-string (slurp "deps.edn")) {})
```
trying this but getting `Unknown coordinate type for clj-time: #:mvn{:version “0.14.2”}` | 2017-12-12T04:47:58.000060 | Renata |
clojurians | clojure | just running `clj` works fine | 2017-12-12T04:48:06.000197 | Renata |
clojurians | clojure | is it because of the overlay effect I mentioned? | 2017-12-12T04:48:56.000267 | Fe |
clojurians | clojure | Try using this instead: ```(->> "/usr/local/Cellar/clojure/1.9.0.273/deps.edn /Users/me/.clojure/deps.edn deps.edn" split-by-space (map slurp) (map read-string) (apply merge))``` | 2017-12-12T04:50:06.000138 | Fe |
clojurians | clojure | (pseudo-code) | 2017-12-12T04:50:20.000572 | Fe |
clojurians | clojure | not sure how that explains the error message though | 2017-12-12T04:51:36.000091 | Fe |
clojurians | clojure | same issue | 2017-12-12T04:52:07.000020 | Renata |
clojurians | clojure | not sure then | 2017-12-12T04:52:43.000091 | Fe |
clojurians | clojure | FWIW all files seem to be using the same syntax as my local `deps.edn` | 2017-12-12T04:52:49.000259 | Renata |
clojurians | clojure | There's <#C6QH853H8|tools-deps> as well btw - Alex is hanging out there | 2017-12-12T04:54:30.000340 | Fe |
clojurians | clojure | ```
(defn vec->map [v]
(into {} (reverse (for [[i k] (keep-indexed vector v)]
[k i]))))
(vec->map [:a :b :a :d])
(comment
{:d 3, :a 0, :b 1})
```
is there a builtin for this/ it builds a map of "first of index" for each value | 2017-12-12T07:59:46.000090 | Berry |
clojurians | clojure | I actually just wrote this code for a coercer. | 2017-12-12T08:40:55.000026 | Jodie |
clojurians | clojure | <@Berry>
```
(vec->map [:a :b :c])
=> {:c 2, :b 1, :a 0}
(zipmap [:a :b :c] (range))
=> {:a 0, :b 1, :c 2}
```
but I assume I'm missing some aspect of the requirement here? | 2017-12-12T09:11:07.000244 | Joette |
clojurians | clojure | <@Joette> that will give you the last index instead of the first if you have duplicates in the array | 2017-12-12T09:12:02.000474 | Noella |
clojurians | clojure | ah, ok just saw the second `:a` | 2017-12-12T09:12:21.000430 | Joette |
clojurians | clojure | here’s my variation:
```(reduce (fn [m [i k]] (if (get m k) m (assoc m k i))) {} (map-indexed vector [:a :b :a :d]))``` | 2017-12-12T09:18:06.000432 | Noella |
clojurians | clojure | you could still go zipmap:
```
(defn f[v]
(zipmap (reverse v) (reverse (range 0 (count v)))))
``` | 2017-12-12T09:21:24.000309 | Joette |
clojurians | clojure | that will be slow if you have large sequences though | 2017-12-12T09:22:52.000155 | Noella |
clojurians | clojure | how about:
```
(defn f[v]
(zipmap (rseq v) (range (dec (count v)) -1 -1)))
```
?
`rseq` is constant time, range is fast as it's bound and not explicitly reversed etc | 2017-12-12T09:31:01.000859 | Joette |
clojurians | clojure | a simplistic bench seems to put them more or less on equal footing, though it seems that rseq is picky and <edited>only lkes vectors and sorted maps</edited>:
```
(def my-v (mapv (comp keyword str) (range 1000000)))
=> #'user/my-v
(defn f[v]
(zipmap (rseq v) (range (dec (count v)) -1 -1)))
=> #'user/f
(defn g [v]
(reduce (fn [m [i k]]
(if (get m k)
m
(assoc m k i)))
{}
(map-indexed vector v)))
=> #'user/g
(take 2 (time (f my-v)))
"Elapsed time: 504.559267 msecs"
=> ([:821597 821597] [:323982 323982])
(take 2 (time (g my-v)))
"Elapsed time: 744.353442 msecs"
=> ([:821597 821597] [:323982 323982])
``` | 2017-12-12T10:00:00.000047 | Joette |
clojurians | clojure | neat benchmark! | 2017-12-12T10:19:48.000580 | Noella |
clojurians | clojure | can you give it a shot with a `transient` map for the `reduce` version? | 2017-12-12T10:20:05.000809 | Noella |
clojurians | clojure | Might also consider using reduce-kv:
```
(reduce-kv assoc
{}
[4 3 2 1])
``` | 2017-12-12T11:10:27.000862 | Sandy |
clojurians | clojure | I am trying to extend a Java class (add a new method) and call a private method of that class inside it.
I tried with `proxy`, I can override an existing method (not a new one) - but can’t seem to access `this` in the overridden code.
Is `gen-class` my only option? | 2017-12-12T11:55:13.000168 | Jonnie |
clojurians | clojure | With this sort of OOP gook, it's often better to write your code in Java and then call that via Clojure. | 2017-12-12T12:12:06.000619 | Sandy |
clojurians | clojure | Or use gen-class, but that's rather hard to get right | 2017-12-12T12:12:18.000638 | Sandy |
clojurians | clojure | <@Jonnie> if you go the java route, I highly suggest trying this lein plugin: <https://github.com/ztellman/virgil> it autoreloads Java classes when the .java files change. Makes playing with Java/Clojure interop a lot faster. | 2017-12-12T12:13:14.000684 | Sandy |
clojurians | clojure | Appreciate the advice, thanks :smile:
(yeah gen-class doesn’t look like the most welcoming bit of Clojure) | 2017-12-12T12:14:48.000610 | Jonnie |
clojurians | clojure | yeah stay away from gen-class | 2017-12-12T12:15:30.000544 | Kareen |
clojurians | clojure | there's <https://dev.clojure.org/jira/browse/CLJ-1255> which would help in most cases where people now reach for proxy/gen-class | 2017-12-12T12:16:25.000247 | Kareen |
clojurians | clojure | if you care, vote for it | 2017-12-12T12:17:07.000704 | Kareen |
clojurians | clojure | it’s an option to define a protocol with the method you want to implement, then proxy the class and also that protocol | 2017-12-12T12:19:49.000443 | Margaret |
clojurians | clojure | yes the real problem is access to `this` private methods (overriding an existing method is fine, performance is not a problem)
I am actually considering a thin separate Java wrapper library now | 2017-12-12T12:21:33.000178 | Jonnie |
clojurians | clojure | I would probably have used `CLJ-1255` if it was there already - so will upvote even though I can’t comment on the actual implementation (EDIT - will upvote once I find my login back) | 2017-12-12T12:22:24.000788 | Jonnie |
clojurians | clojure | Thanks all :smile: | 2017-12-12T12:22:35.000015 | Jonnie |
clojurians | clojure | bronsa: do you think you could write that as a macro and release it as a library outside of core? | 2017-12-12T12:24:38.000389 | Rebeca |
clojurians | clojure | I could | 2017-12-12T12:24:46.000648 | Kareen |
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