is there a specific directory where I should be executing the lein script from: https://github.com/technomancy/leiningen#installation ? I did brew uninstall leiningen. Now I downloaded the script and ran it in the terminal. It outputted some available tasks but I can't get "lein" command to be recognized by the system after it supposedly installed.

Leiningen is a tool for working with Clojure projects.

Several tasks are available:
change              Rewrite project.clj by applying a function.
check               Check syntax and warn on reflection.
classpath           Print the classpath of the current project.
clean               Remove all files from project's target-path.
compile             Compile Clojure source into .class files.
deploy              Build and deploy jar to remote repository.
deps                Download all dependencies.
do                  Higher-order task to perform other tasks in succession.
help                Display a list of tasks or help for a given task.
install             Install the current project to the local repository.
jar                 Package up all the project's files into a jar file.
javac               Compile Java source files.
new                 Generate project scaffolding based on a template.
plugin              DEPRECATED. Please use the :user profile instead.
pom                 Write a pom.xml file to disk for Maven interoperability.
release             Perform :release-tasks.
repl                Start a repl session either with the current project or standalone.
retest              Run only the test namespaces which failed last time around.
run                 Run a -main function with optional command-line arguments.
search              Search Central and Clojars for published artifacts.
show-profiles       List all available profiles or display one if given an argument.
test                Run the project's tests.
trampoline          Run a task without nesting the project's JVM inside Leiningen's.
uberjar             Package up the project files and dependencies into a jar file.
update-in           Perform arbitrary transformations on your project map.
upgrade             Upgrade Leiningen to specified version or latest stable.
vcs                 Interact with the version control system.
version             Print version for Leiningen and the current JVM.
with-profile        Apply the given task with the profile(s) specified.

Run `lein help $TASK` for details.

Global Options:
  -o             Run a task offline.
  -U             Run a task after forcing update of snapshots.
  -h, --help     Print this help or help for a specific task.
  -v, --version  Print Leiningen's version.

These aliases are available:
downgrade, expands to upgrade

See also: readme, faq, tutorial, news, sample, profiles, deploying, gpg,
mixed-source, templates, and copying.
[tlomberg@tlomberg-mac /Users/tlomberg/workspace] $ lein install
-bash: lein: command not found

@tlomberg did you add it to your path?

how do I do that?

Depending on your OS, I'd Google it. Typically there's an environment variable, PATH, where you add directories. If you're on Linux/Mac type 'echo $PATH' in a shell and you can install lein into something found in the result. I have mine in /usr/local/bin.

There's also a #leiningen channel that is better suited for these questions.

i'm on a mac

[tlomberg@tlomberg-mac /usr/local/bin] $ echo $PATH /Users/tlomberg/:/usr/local/mysql/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/MacGPG2/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin:/usr/kerberos/sbin:/usr/kerberos/bin

i have the script under /usr/local/bin

seeing same behavior

Did you follow the instructions in the link you posted above? Have you made the script executable? What behavior do you see?

[tlomberg@tlomberg-mac /usr/local/bin] $ . lein-install-script.sh
dirname: illegal option -- b
usage: dirname path
dirname: illegal option -- b
usage: dirname path
Leiningen is a tool for working with Clojure projects.

Several tasks are available:
change              Rewrite project.clj by applying a function.
check               Check syntax and warn on reflection.
classpath           Print the classpath of the current project.
clean               Remove all files from project's target-path.
compile             Compile Clojure source into .class files.
deploy              Build and deploy jar to remote repository.
deps                Download all dependencies.
do                  Higher-order task to perform other tasks in succession.
help                Display a list of tasks or help for a given task.
install             Install the current project to the local repository.
jar                 Package up all the project's files into a jar file.
javac               Compile Java source files.
new                 Generate project scaffolding based on a template.
plugin              DEPRECATED. Please use the :user profile instead.
pom                 Write a pom.xml file to disk for Maven interoperability.
release             Perform :release-tasks.
repl                Start a repl session either with the current project or standalone.
retest              Run only the test namespaces which failed last time around.
run                 Run a -main function with optional command-line arguments.
search              Search Central and Clojars for published artifacts.
show-profiles       List all available profiles or display one if given an argument.
test                Run the project's tests.
trampoline          Run a task without nesting the project's JVM inside Leiningen's.
uberjar             Package up the project files and dependencies into a jar file.
update-in           Perform arbitrary transformations on your project map.
upgrade             Upgrade Leiningen to specified version or latest stable.
vcs                 Interact with the version control system.
version             Print version for Leiningen and the current JVM.
with-profile        Apply the given task with the profile(s) specified.

Run `lein help $TASK` for details.

Global Options:
  -o             Run a task offline.
  -U             Run a task after forcing update of snapshots.
  -h, --help     Print this help or help for a specific task.
  -v, --version  Print Leiningen's version.

These aliases are available:
downgrade, expands to upgrade

See also: readme, faq, tutorial, news, sample, profiles, deploying, gpg,
mixed-source, templates, and copying.

[Process completed]

i made it executable

what you downloaded and named lein-install-script.sh is literally the lein command. You would copy that script to /usr/local/bin/lein (for example) and chmod +x /usr/local/bin/lein

and at that point if you type which lein in your shell, it should respond /usr/local/bin/lein

Right, I see that now 🙂 Change the file to 'lein' as @gonewest818 says.

In your transcript above, I see you are also sourcing the file (`. lein-install-script.sh`) but when all is said and done you will just run lein at the prompt.

The “installation” they are referring to is really just downloading the leiningen jar. By default the jar is placed in ~/.lein/self-installs/leiningen-$(VERSION)-standalone.jar. Because in general different projects may use different versions of leiningen you could end up with more than one jar in the self-installs directory and that’s fine. You shouldn’t really need to worry about that.

How could I turn [0 1 2 3] into [[0 1] [1 2] [2 3]]? kind of like joining them.

@caleb.macdonaldblack sounds like partition...

@seancorfield Awesome thanks! (partition 2 1 [0 1 2 3]) => ((0 1) (1 2) (2 3))

@gonewest818 @the2bears @noisesmith @tanzoniteblack Thank you for your help!

I can't believe (def a-?-2 30) is valid code.

- ? are both valid constituent characters for symbols

Still having leiningen problems, after I installed lein script in /usr/local/bin and started using it, I’m seeing strange behavior: When I try to package a jar, I see the following:

[tlomberg@tlomberg-mac /Users/tlomberg/workspace/recruit-app] $ lein deploy
Tried to use insecure HTTP repository without TLS.
This is almost certainly a mistake; however in rare cases where it's
intentional please see `lein help faq` for details.Tried to use insecure HTTP repository without TLS.
This is almost certainly a mistake; however in rare cases where it's
intentional please see `lein help faq` for details.

i get it in different projects

[tlomberg@tlomberg-mac /Users/tlomberg/workspace/gardner] $ lein deploy
Created /Users/tlomberg/workspace/gardner/target/gardner-0.4.9-SNAPSHOT.jar
Wrote /Users/tlomberg/workspace/gardner/pom.xml
Tried to use insecure HTTP repository without TLS.
This is almost certainly a mistake; however in rare cases where it's
intentional please see `lein help faq` for details.

where are you trying to deploy?

This is something that leiningen 2.8.1 does if you are using http repositories in your setup. If you can't switch from http to https you can run lein upgrade 2.7.1 for a temporary workaround

if all you want is to make a jar, you don't need to use deploy, just use lein jar or even lein install to put it in your local cache (in case you literally meant "package a jar" and not put a jar in a repo)

you can use jar, install or uberjar, depending on what you want, if you actually just want to package it

we use nexus

i need to package it and import it into another project as a dep

either upgrade your nexus to use https, or downgrade to 2.7.1

could be as simple as replacing http with https in your profile/config

https is the better option, though I know that isn't always under your control

if it's already setup for https

are you doing this on the same machine? Unless you need this go through nexus you can just use lein install

but yes, upgrading/reconfiguring nexus to use TLS is the correct answer, even if that means badgering IT to do an upgrade

what's the most modern way to quickly bring in a dependency for an experiment without doing a project? I'm trying to use Clojure like a scripting language. Ie. Do lein repl run a few commands and then be done with it. lein-try seems to be an option (https://github.com/rkneufeld/lein-try) seems to be an option but it's kinda old and not sure if it's best practice

is the clj command that came with 1.9 a path I should consider?

@husain.mohssen lein-try should totally work, it’s using a very slow-moving part of the ecosystem. did you try it? they used it to verify all the recipes in the Clojure Cookbook. clj command will be a fun learning experience, if it doesn’t work 🙂 i know @mfikes has already got a lot of practice putting these one-liners together

@robert-stuttaford thanks! what does the last line mean? Can I bring external dependencies using the new clj from the command line?

ah - i don’t know - i was kinda going on the idea that you knew 🙂

reading https://clojure.org/guides/deps_and_cli and https://github.com/clojure/tools.deps.alpha now

ok. seems you need a deps.edn @husain.mohssen. you’ll probably win through in 10 minutes if you try it out

yes that works, but in that case Im better off using lein try since that does not require an external file. btw is there a reason to prefer clj over lein repl in 1.9?

@husain.mohssen @robert-stuttaford you do not need a deps.edn:

~$ clj -Sdeps "{:deps {org.clojure/core.async {:mvn/version \"0.4.474\"}}}"
Clojure 1.9.0
user=> (require '[clojure.core.async :as async])
nil
user=> (async/chan)
#object[clojure.core.async.impl.channels.ManyToManyChannel 0x276b68af "clojure.core.async.impl.channels.ManyToManyChannel@276b68af"]

if you don’t want to use lein any more, that’d be one great reason 🙂

clj starts a lot faster than lein/boot repl

and tools.deps allows you to use git repos and local directories as deps, first-class. no more lein install / checkouts shenanigans

that is rad @sundarj

(i deliberately chose a dep i had downloaded before)

clj --help @husain.mohssen

you can open a cljs repl with it too:

clj -Sdeps "{:deps {org.clojure/clojurescript {:mvn/version \"1.9.946\"}}}" -m cljs.repl.node
ClojureScript Node.js REPL server listening on 49391
To quit, type: :cljs/quit
cljs.user=> (.log js/console "hello node")
hello node
nil

@sundarj where did you find -Sdeps in the docs? rather, where is it documented

@robert-stuttaford it's here: https://clojure.org/reference/deps_and_cli#_usage

It’s new if you don’t have the latest

thanks - i don’t know how i missed it on there 🙈

in deps, is git gonna be able to use ssh?

yes, it talks to your local ssh-agent

to provide credentials

so works with github private repos for example

ssh://???

yeah (presuming you register your identity with your ssh agent)

instead of I must use

I have the identity

yes

Thanks!!

with github, most people use the [email protected]:user/project.git url

which is ssh

the thing it gives you on a project page under the “clone or download” button

I tried that url and it didnt work, but under gitlab

UnknownHostKey: http://gitlab.com. RSA key fingerprint is b6:03:0e:39:97:9e:d0:e7:24:ce:a3:77:3e:01:42:09

@alexmiller most people do not use ssh at github

UnknownHostKey: . RSA key fingerprint is b6:03:0e:39:97:9e:d0:e7:24:ce:a3:77:3e:01:42:09

@rcustodio to avoid that issue, first do ssh and accept the host key -- then try again with clj

This helps in company provate repositories

I see

Okey, thanks

@ghadi I did it, still the error

one sec -- there is a way to force a particular algorithm for the host key, digging it up

the other thing that has come up is host keys in non-rsa keys, which the current path doesn’t handle by default

ed25519 keys do work, it's JSch's key order that bungles things up

(through an ssh-agent it does the right thing, but not if you have entries in .ssh/config)

It worked, but I had to use it like

oh, cool. Did you mess with known_hosts at all?

interesting

Nope, just changed the URL

what was the URL before?

:user/project.git

interesting x2

yeah, that’s interesting

@chris @noisesmith @mpenet Thank you! downgrading to 2.7.1 worked for me

I use Mac if that makes any diff

eventually we will uncover and document all of the complexities around using git deps :)

Now, I dunno what this error means

Error building classpath. Manifest type not detected when finding deps for vikingmakt/njord in coordinate {:git/url "", :tag "0.3.0", :sha "862c1f6d91293e5ba7b621a6db2a07149c90eab7"}

it’s trying to understand the dependencies of that project

by detecting a manifest file like deps.edn or pom.xml

Right now the latest tools.deps reads through maven poms, and deps.edn

So the project should have deps.edn as well?

it does not (yet) understand project.clj

I see, good to know

so yes, you’ll need a deps.edn to declare deps for now

I will talk with ppl in the company to start doing the deps.edn

if it doesn’t have any deps, you could add :deps/manifest :deps to force deps.edn and it will tolerate the missing manifest file

I see, thanks!!!

@alexmiller Any chance future versions of clj will have syntactic sugar for dependencies that make it less verbose to quickly test something (a-la lein try) ?

you can already do that through clj -Sdeps @husain.mohssen

see https://twitter.com/mfikes/status/955957557184614401

(if you single quote the outer argument, then you don't have to escape the inner string)

In maven we have -U to download the repositories to the internal repository if its not present there -U,--update-snapshots Forces a check for missing releases and updated snapshots on remote repositories

What is the similar option in Leiningen ?

@rnagpal same flag, -U

but also, in case there's any miscommunication - every dep leiningen uses is put in the local cache, -U is for checking for a newer snapshot even if you have one that's been fetched within the last 24 hours

@noisesmith -U doesn’t have any affect

what do you expect that isn't happening/

but if I declare the same dependency in pom.xml and run mvn -U

it will download the dependencies missing in the internal repository

leiningen always does this

unless you mean some actual repo other than the .m2 cache?

yeah not the local .m2

but internal

mvn -U just checks for new snapshots, according to the man page

which is what lein -U does

Forces a check for missing releases and updated snapshots on remote repositories

so it checks the releases also

on the remote repository

are you expecting auto version upgrading?

you need a different kind of dep version tag for that, it's the same syntax used for maven though

the leiningen team and community are highly opinionated against version ranges

so yo uwont' see many examples of that in the wild

but if you ask for a version range, you get compatible behavior

nopes, I dont want auto version upgrades. I just want to pull the missing release jars in the internal repo if they are missing there

I have no idea what's going on here or what you are expecting, maybe someone else can help, sorry

Thanks for trying to help @noisesmith

Does anyone know of a tool that will scan a clojure project dependencies and collect the license information from clojars? There are several tools that will do the java libraries, but they don’t seem to know about clojars.

maybe https://github.com/clojars/clojars-web/wiki/Data

yeah, I’ll probably have to resort to writing my own crawler against the clojars api. Was hoping someone already did. 🙂

I think it would be fairly straightforward to add the license to https://github.com/clojars/clojars-web/wiki/Data#useful-extracts-from-the-poms

you could also visit each pom.xml accompanying each jar on the classpath, and extract the license data

or that!

ah, interesting, thanks!

You could probably crib some code from lein-ancient for doing the Maven scan…

so… let’s say i’ve got a java dependency i’d like to bring in that requires jvm 1.8. what are my options, if i want to support 1.6/1.7 users in some way (across lein, boot, tools.deps.alpha, maven)? spitballing ideas so far: - use a “provided” dependency and require the consumer to decide whether to pull it in; have the code see if the relevant classes are available at runtime (similar to what clojure.core.reducers does) - abandon pre-jvm-1.8; require consumers to upgrade is there anything else?

- Create two variants of the JAR for consumers to pick ?

There are some options, I new of some java collogues using some library where they could use lambda's, and still compile to 1.7. but when the incompatibilities are in libraries, and not in your own code, it might be more challenging.

at this point... abandon < 1.8

Java 9 has Multi-Release JARs, but that doesn't help you yet @trptcolin

https://github.com/orfjackal/retrolambda

7 is long EOLed

Yes, but some companies are very conservative unfortunately.

yeah, including mine, unfortunately

I would say unless you are supporting something specific for, say, enterprise you can safely say sayonara

so if we go non-hypothetical: this is for reply (which is the leiningen / boot repl). i don’t think abandoning < 1.8 is realistic [could be wrong]

maybe the 2018 clojure survey results will have a different answer than i expect 🙂

:thinking_face: > After April 2015, Oracle will no longer post updates of Java SE 7 to its public download sites.

[hi @bhauman 😉]

2017 survey results had minimal java 7 (sorry not trying to make your life hard @chris )

I’m ready to abandon java 7 for clojure :)

2018 results so far are showing ~6% of people still using java 7 and <0.4% still using java 6

iiiiinteresting…

90% are using java 8

the new clj tool requires 1.8

java 1.8 that is

java 1.8 is set to end public updates in Jan 2019

Google is only testing Closure-compiler using 1.8 and is using 1.8 features on tests at least (it might still be possible to run Closure, and Cljs, on Java 1.8, but probably not for long)

thanks y’all, good stuff. seems like there’s a pretty reasonable case for abandoning pre-1.8, good news

for anyone else looking to enumerate licenses, https://github.com/technomancy/lein-licenses does the trick!