What I do now is open project.clj, add dependency there, run lein deps restart repl, then use, require and so on.
The thing is that I don't really like to restart repl because the startup time is slow and I have to reload my files again.
So is there a better way to add dependency to lein project? without restarting the repl?
You can use Alembic, a dynamic classpath loader and dependencies resolver. The good thing is that it doesn't load all pomegranate dependencies.
Add the following to your .lein/profiles.clj:
{:user
{:dependencies [[alembic "0.3.2"]]}}
Then in your Repl just load the classpaths you need, they will be pulled from the repositories by leinif need:
(require 'alembic.still)
(alembic.still/distill '[enlive "1.1.5"])
(require 'net.cgrand.enlive-html) should now work.
for quick testing you can use pomegranate to add dependencies on the fly
=> (use '[cemerick.pomegranate :only (add-dependencies)])
nil
=> (add-dependencies :coordinates '[[incanter "1.2.3"]])
for actually adding a dependency I ususally hit
Alt-x nrepl-restart
ctrl-cctrl-k to reload the file,
ctrl-calt-n to get back to the namespace i in the buffer
The whole process takes the jvm startup time (which i agree is a touch painful) plus five seconds. It helps to keep your project in a state where loading a file does all the require initialization.
Related
I am using lein repl without a project so there is no project.clj.
I am running Leiningen 2.8.1 on Java 1.8.0_191 OpenJDK 64-Bit Server VM.
When I require a Clojure dependency that I assume should just work - like clojure.data.json - I notice that it is not in my .m2 directory. Is that why I am getting a FileNotFoundException Could not locate clojure/data/json__init.class or clojure/data/js
on.clj on classpath? I can't find my other Clojure dependencies there either so I don't know where they reside and if this dependancy should be in .m2 or not.
I understand the error message but without knowing its location or even knowing how to properly add it to the CLASSPATH for the REPL to see it, I remain stuck.
Is this a dependency that I still need to install? If so, how do I install it without going through a project?
I don't understand the JVM as I am new to it, so add a little extra information in your answer.
I have looked at this, this, this, this and this. I don't know if I am overlooking anything so your help will really be appreciated.
I am using lein run without a project so there is no project.clj.
If you're using Leiningen, this'll be much easier if you create a project.clj file that declares your dependencies. Leiningen will read project.clj and handle fetching any missing dependencies to your local Maven repository, and add them to your classpath when you start your REPL/application. (lein run doesn't work for me in a directory without a project.clj; I get an error: No :main namespace specified in project.clj.. Did you mean lein repl?)
When I require a Clojure dependency that I assume should just work - like clojure.data.json - I notice that it is not in my .m2 directory.
clojure.data.json doesn't ship with Clojure — it's a separate dependency that must be fetched and added to your classpath in order to use it. The classpath tells the JVM where to look when it loads class files. Leiningen will do both of these things for you if you declare the dependency in project.clj:
:dependencies [[org.clojure/clojure "1.10.0"]
[org.clojure/data.json "0.2.6"]]
You can also use the lein deps command if you only want to fetch dependencies.
You can create a new/blank Leiningen project with lein new project_name_goes_here. It will have a project.clj with a few boilerplate entries and a :dependencies key where you can declare dependencies.
I understand the error message but without knowing its location or even knowing how to properly add it to the CLASSPATH for the REPL to see it, I remain stuck. Is this a dependency that I still need to install? If so, how do I install it without going through a project?
You could manually download it from the internet, then manually add its path to your classpath, but if you're already using Leiningen it's much easier to add a line to a project.clj file and have Leiningen handle this for you.
If using a project.clj file w/Leiningen isn't an option, there are other ways to use Clojure and resolve dependencies/build a classpath at runtime. Boot accommodates this workflow, you can use Leiningen like this with a little added effort, as well as the newer tools.deps tooling. There are examples of each in this ClojureVerse thread, but note that some of these approaches are doing essentially the same thing as declaring the dependency in a file — instead declaring them as CLI arguments.
For example, using Clojure CLI tooling:
$ clj -Sdeps "{:deps {org.clojure/data.json {:mvn/version \"0.2.6\"}}}"
Clojure 1.9.0
user=> (require '[clojure.data.json :as json])
nil
user=> (json/write-str {:foo "bar"})
"{\"foo\":\"bar\"}"
user=> (System/getProperty "java.class.path")
"src:
/Users/me/.m2/repository/org/clojure/clojure/1.9.0/clojure-1.9.0.jar:
/Users/me/.m2/repository/org/clojure/data.json/0.2.6/data.json-0.2.6.jar:
/Users/me/.m2/repository/org/clojure/spec.alpha/0.1.143/spec.alpha-0.1.143.jar:
/Users/me/.m2/repository/org/clojure/core.specs.alpha/0.1.24/core.specs.alpha-0.1.24.jar"
You could create a deps.edn file containing {:deps {org.clojure/data.json {:mvn/version \"0.2.6\"}}} in the same directory, and clj would read that, resolve the dependencies if necessary, and build the classpath accordingly.
This is a great opportunity to use lein try. Once you add it to your ~/.lein/profiles.clj, you'd simply run: lein try org.clojure/data.json and you'll be greeted with a running REPL with that dependency just a require away.
I play with this great Gorilla REPL powered project ( https://bitbucket.org/probprog/anglican-examples/ to be specific), and want to use it under certain restricted circumstances.
Is there a way to produce an uberjar that can be started using only a JVM?
Well, I know how to create an uberjar for this project, but can I start a Gorilla REPL from it? If not what do I have to add and how do I start it?
EDITED Note on Juraj's answer:
I added a start file src/gorillaproxy/gorillaproxy.clj with the following content:
(ns gorillaproxy.gorillaproxy
(:use [gorilla-repl.core :only [run-gorilla-server]])
(:gen-class))
(defn -main
[& args]
(run-gorilla-server {:port 8990}))
Then I added [gorilla-repl "0.4.0"] to the dependency list (in project.clj), and the line
:main gorillaproxy.gorillaproxy
In that way the uberjar started the Gorilla REPL, and when I put the worksheets (and data, resources, .. if needed) into the same directory, everything worked fine.
Gorilla is typically run via the lein-gorilla plugin and thus isn't a part of an uberjar.
If you really want to create a bundle containing gorilla repl dependencies, then you need to add it this capability manually to your project.
The question is why would you want to do that.
Do you want to distribute these samples to somebody else? If that's the case, you'll still need to have all those worksheets in the current directory from where your uberjar is run because that's how gorilla repl discovers worksheets.
You can look at lein-gorilla source code to see how gorilla repl can be started.
I'd then at the same code to your project (create new src/core.clj file or whatever) and configure it in your project.clj as :main.
You'll also need to add gorilla-repl as a dependency to your project.clj
Notice however, that you'll need to run that uberjar from a directory where your anglican worksheets are (or a parent directory of such a directory).
For the development of a library I started from a lein project, invoked like so:
lein new mylib
if I call lein install now, I can access my library in other projects. But trying to immidiately test the functions I wrote failed:
lein repl
...
(dir mylib.core)
Exception No namespace: mylib.core found clojure.core/the-ns (core.clj:4008)
Do I have to add something to the project.clj file maybe?
In order to use a library you must cause the code to be loaded - that it be on the classpath is not sufficient.
You can do this easily in an ns declaration in a file of course, but in the repl it can be easier to use (require '[my-lib.whatever :as w]) after which one can call (w/foo) (w/bar) etc. as expected. You can also use (in-ns 'my-lib.whatever) in order to switch to the namespace, but this will not give you a good result unless you have previously used require or use or load-file etc. to get the definitions first.
Let's say you created a new library named clj-foo.
% lein new clj-foo
Start your repl.
% cd clj-foo
% lein repl
In the repl, load the main entry point to your library and switch to its namespace.
(load-file "src/clj_foo/core.clj")
(ns clj-foo.core)
Now you're in the clj-foo.core namespace, make sure to add back in the repl ns to get things like doc available.
(use 'clojure.repl)
That's it. You're all set to start calling functions in your library. Note that other library files will be available from the clj-foo.core namespace if they were loaded by namespace declaration at the top of clj_foo/core.clj. If not, then you'll need to invoke load-file with their path as well.
If you make changes in core.clj. You can invoke load-file again to pick up the new code. As you progress, you can use cider to facilitate loading of individual functions and files. But that's for another question. :)
You need to add a dependency to use your library from another project. To do this add a vector (a tuple-2) to the vector that is the value of the :dependencies key in the project.clj file. Here's an example:
:dependencies [[org.clojure/clojure "1.7.0"]
[org.clojure/clojurescript "1.7.170"]
[org.clojure/core.async "0.2.371"]
[default-db-format "0.1.0-SNAPSHOT"]
[com.andrewmcveigh/cljs-time "0.3.14"]]
My own local library is called default-db-format. Its really no different to adding a dependency for com.andrewmcveigh/cljs-time.
As you say you can already do this, but are having trouble getting a REPL connection to the project of the library itself. When you go (in-ns 'some-path), you need the single quote in front of some-path. Note that some-path is a different thing to the name of your library.
Rather than use lein repl you can use the figwheel repl - if your project is setup with figwheel. My library has only one entry point and that is lein figwheel devcards. After that I had no problem going to a namespace and trying out a function:
cljs.user=> (in-ns 'default-db-format.core)
nil
default-db-format.core=> (check 1 2)
As noisesmith mentioned having a REPL in your IDE is the best setup. No fiddly typing just bring up pre-configured REPLs (per namespace) with the click of a button (or keystroke). Figwheel/Cursive setup instructions here.
I was also facing the same issue with the following configuration:
Leiningen 2.9.0 on Java 1.8.0_201 Java HotSpot(TM) 64-Bit Server VM
My file looks like this, and from the repl I desired to invoke the foo function
(ns cljtest.test
(:gen-class))
(defn foo [input]
(assoc {} "a" 123))
Both these approaches worked fine for me on the repl.
1)Switch to the appropriate name space:
cljtest.core=> (in-ns 'cljtest.test)
#object[clojure.lang.Namespace 0x90175dd "cljtest.test"]
cljtest.test=> (foo nil)
{"a" 123}
cljtest.test=>
2)Require the appropriate name space:
cljtest.core=> (require '[cljtest.test :as test])
nil
cljtest.core=> (test/foo nil)
{"a" 123}
cljtest.core=>
.lein/profiles.clj has dependencies as,
{:user {}
:repl {:dependencies [[org.clojure/clojure "1.4.0"]
[ring/ring "1.1.6"]]
}}
in repl
(require 'ring.adapter.jetty)
throws,
java.io.FileNotFoundException: Could not locate ring/adapter/jetty__init.class or ring/adapter/jetty.clj on classpath: (NO_SOURCE_FILE:0)
This means, ring dependency is not loaded in repl shell. Any mistakes?
Firstly, I would recommend reading https://github.com/technomancy/leiningen/blob/stable/doc/PROFILES.md as I'm not sure you are using profiles correctly. In particular, at the end it shows a way of debugging your profiles, which will show you what is going on.
Secondly, I'm not sure about "there is no project - I am running it from bash shell". If your loading jetty and using ring, you will also need code which sets handlers, routes and probably middleware. this means code files, which means a project tree. Create a basic project with lein new and run from the root of that project.
However, if you really do need to do it as you say, I would suggest you just do
{:user {:dependencies [[....]]}} as your profiles.clj as I suspect that what is happening is that lein is not loading your :repl profile. You could also try running lein with the explicit profile i.e. lein with-profile +repl repl
I'm running into problems because the library I have appears to conflict with the published documentation. I had a few problems with getting the right version of things installed before, and I'm wondering if this is the cause.
Is there any way to print out which jars were loaded in the repl so I can check?
You can also use query lein for
the classpath with lein classpath
a dependency tree printout with lein deps :tree
This might also help:
lein deps :tree - shows a tree of dependencies that get pulled in
[library "version" :exclusions [some-other-lib "version"]] - exclude the some-other-lib that gets pulled in by some library.
You can then manually pull in the right version of some-other-lib by defining your own dependency vector.
(System/getProperty "java.class.path")
There are several options:
using java interrop: (System/getProperty "java.class.path"), (println (seq (.getURLs (java.lang.ClassLoader/getSystemClassLoader))))
clojure/java.classpath contains useful functions: like system-classpath
lein: lein classpath and lein deps :tree
boot: boot show -p, as well as useful function in boot environnement. Maybe have a look at martinklepsch/boot-deps.
For boot, I also wrote nha/boot-deps that helps managing dependency conflicts.