I setup emacs slime/clojure as written here.
When I run (doseq [p (.getURLs (java.lang.ClassLoader/getSystemClassLoader))] (println (.getPath p))) to get classpath, I get the following.
/Users/smcho/.swank-clojure/clojure-1.1.0-master-20091202.150145-1.jar
/Users/smcho/.swank-clojure/clojure-contrib-1.1.0-master-20091212.205045-1.jar
/Users/smcho/.swank-clojure/swank-clojure-1.1.0.jar
How can I add classpath for emacs/slime for clojure?
The procedure differs depending on whether you are using slime-connect to start slime (by connect to a remote swank server, created with lein swank, for example) or you are starting slime using M-X slime.
If you're using slime-connect, you'll need to modify the classpath of the java process that is running the swank server. If you're starting the swank server using lein swank, simply add the jars you want to be part of your classpath to the project's lib directory.
On the other hand, if you're starting slime using M-X slime, the following elisp code will do the magic for you (just place it in your ~/.emacs file).
(eval-after-load "swank-clojure"
'(progn
(add-to-list 'swank-clojure-classpath
"/Users/smcho/.clojure/")
(add-to-list 'swank-clojure-classpath
"/Users/smcho/.clojure/blah.jar")))
This will add /Users/smcho/.clojure/ and /Users/smcho/.clojure/blah.jar to the classpath. (Please note that you'll either need to restart emacs or reload the .emacs file: type M-X load-library and then type .emacs on the next prompt.)
I believe the advised way to fire up a clojure reple nowadays is to use lein swank, and use \M-x slime-connect. See http://github.com/technomancy/leiningen/ for a detailed description of this tool.
Using leiningen, you can configure your project using a configuration file, project.clj. On this file you may require remotely (maven-)published jars, and by running lein deps you will get a "lib" directory with all the jars. Since the lein swank command uses that directory as a classpath, all you have to do is to add your jars to that directory.
That said, if you're still using \M-x swank-clojure-project, it will also detect your jars under that directory.
However, if you're just using a plain \M-x slime to fire a clojure repl, then I think there's no "clean" solution (aside from adding the path to your global environment's $CLASSPATH or to use some elisp voodoo - like the one in seh's answer - to change the java vm command arguments. But I believe this is only intended to do some quite basic experiments, and shouldn't be used for any project-based work (exactly for this reason!)
If you're willing to hard-code the list of Jar files, this Emacs Lisp form should suffice:
(let ((base-path "/Users/smcho/.swank-clojure"))
(setq swank-clojure-classpath
(append
swank-clojure-classpath
(mapcar (lambda (d)
(expand-file-name d base-path))
'("clojure-1.1.0-master-20091202.150145-1.jar"
"clojure-contrib-1.1.0-master-20091212.205045-1.jar"
"swank-clojure/swank-clojure-1.1.0.jar")))))
That takes your list of Jar files and adds them to the variable swank-clojure-classpath. Note that this form must be evaluated by Emacs, not SLIME's Swank. It's used by Emacs to start up the Java process that will run Clojure and Swank within it.
There are more elaborate ways to set up the class path for a project, such as including Maven-style paths below a designated project root directory.
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).
This question is a follow up to How does one pre-load a clojure file in the leiningen repl?.
My ~/.lein/profiles.clj looks as follows:
{
:user {:source-paths ["C:/Users/username/.lein/src"] }
}
My ~/.lein/src/user.clj might look as follows:
(ns user)
(println "user file loaded")
When I run lein repl within a folder containing a project.clj, then the user.clj file is executed, but when I run lein repl from another folder it doesn't load my user profile. Is there a workaround for this or is this behavior by design? In fact, I know that Leinigen is indeed loading my profile.clj (even when there is no project.clj) because there are also other things inside (taken from the excellent pimp my repl article). Leinigen is just having problems with my additional source-paths setting.
One other question related to this is the fact that I need to specify the full path of the folder for my user.clj file : "C:/Users/username/.lein/src". When I change that to "~/.lein/src" leiningen fails to load my file.
It sounds like you just want some code loaded for your lein repl sessions. This is done with the :init key of the :repl-options in your profiles.clj. You can load-file other files in init if you want to organize in that fashion.
{:user
{:repl-options
{:init (load-file "path-to-file/user.clj")}
...}}
Note: If you are using Windows-style path delimiters /, you'll need to escape them //.
I am very new to both Clojure and Leiningen. I have installed Clojure on Windows at C:\clojure-1.5.1 and leiningen-win-installer beta1 at C:\.lein\bin.
Now I am trying the example from Eric Rochester's book. I have included dependent libraries for Incanter in project.clj and also using dep.
How do I use the command (use 'incanter.core)? I am getting 'use' is not recognized as an internal or external command. In addition, how do I use lein commands at user=>?
Edit - I forgot "lein deps" until I saw Mars's answer
Before you start lein repl, you have to make the project (with "lein new getting-data" or whatever is in the book).
That makes a new directory, and in that directory you find and edit "project.clj" to include the dependencies (as shown in book).
cd into the directory that project.clj is in and run "lein deps" from the dos/powershell prompt.
THEN when you run lein repl, from within that same directory, at the user=> prompt, do
(use 'incanter.core)
and it will come back with "nil" and you'll be running. You might want to first run some examples from the leiningen page to get more of a feel for lein. You always type clojure commands at the "user=>" prompt, not at the "c:....>" prompt.
There's a bit of subtlety in Leiningen project.clj's. I haven't found an easy introduction. Levin Magruder's advice will no doubt get you started. The basic idea is that once the project file is set up correctly, lein deps will go out and find the libraries you need, and put them in a place where lein repl can find them. Then use will work for the libraries that have been downloaded. For more info, study of the detailed comments project.clj sample file may be helpful. (Not part of the answer to this question, but if you're having problems with use, you're likely to get tripped up by ns and filenames soon (I was): I recommend Colin Jones' introduction to ns and its options.)
I'm using emacs with clojure-swank and slime and trying to set my development environment. And I ran into a problem. When I start a repl I'm stuck in an unknown directory preventing me to load my namespace. Because the clojure repl can't find the right file.
Does anyone know how to change the current directory?
PS: I've just started using emacs and slime so I'm a noob.
If you want to change slime's notion of the current directory, press ,cd<CR> (<CR> = Enter) and type in the path.
However, this is not really the proper solution to the problem. The proper solution involves setting up the classpath so that you can (use 'your.namespace). To this end, I wonder if this very long answer I provided to a question about setting up the classpath properly might be helpful... :-)
Incidentally, I somewhat object to solutions involving add-classpath, as that is currently marked as deprecated and was never meant to be relied upon in the first place... Though on the other hand, it certainly may work perfectly well and it's worth knowing about just in case it might come in handy as a quick-and-dirty classpath injection gimmick.
Now if you want a real nice SLIME-based development environment, I'd like to point you to a very nice clojure-project elisp function by Phil Hagelberg which sets up all relevant variables and launches SLIME in the main directory of a project (to be supplied interactively). It's been posted to the Clojure group, in fact here's a link to the Mail Archive's copy of that message. Note there's one thing which needs correction in there -- swank-clojure-jar-path ought to be set to the full path to clojure.jar. Otherwise it's a fantastic tool.
Actually I mentioned that function in this response to a question about managing the classpath when using Clojure and Emacs. The other answers might be interesting as well.
And if you're only just beginning to use SLIME, do watch the SLIME video, linked to from SLIME's homepage which is now available under a link posted by Michiel in the comments. It's a very good introduction. :-)
Leiningen is a new Clojure build tool that worries about classpathing for you. You set up a simple project file in the project's root directory to specify the main class of your project, and it automagically discovers all the JARs in your lib directory and loads them for you.
I now just type "lein swank" at a command line and then M-x slime-connect in Emacs, and everything just works. (This could easily be automated with a little Elisp.)
More info in this blog post.
Short answer:
(load-file "full-path-to-definition")
Long answer:
Here's what my bootstrapping process looks like:
In ~/.clojure/user.clj (this file is auto-run when you boot slime/clojure):
(add-classpath "file://path/to/foo.jar") ; Include these jars in the classpath
(add-classpath "file://path/to/foo2.jar")
(load-file "file://workspace/bootstrap.clj")
In bootstrap.clj:
(compile 'my.package)
Package file(s) is at /workspace/my/package.clj
In package.clj:
(ns my.package)
(defn foo [] (+ 2 2))
The best approach I've found when using Emacs, SLIME and swank-clojure is to use the (Emacs Lisp) function swank-clojure-project. From its documentation:
(swank-clojure-project PATH)
Setup classpath for a clojure project and starts a new SLIME session.
Kills existing SLIME session, if any.
If you do a "M-x swank-clojure-project", it will interactively prompt you for your project directory; once you've selected it, all the jars in a lib subdirectory, as well as the src and classes folder will be added to your classpath. It will also honor a Maven/lein directory structure, in other words: it will usually just work.
If you change something, e.g. add a new jar file, simply do swank-clojure-project again.