Hi John,
> Useful blog post, thanks!
Thanks!
> I've been using lein-oneoff for this. What are the differences between
> lein-exec and lein-oneoff?
Current latest versions of lein-exec (0.2.0) and lein-oneoff (0.2.0)
have some overlap, but let me list few differences AFAIC:
1. lein-oneoff works with Lein 1.x, lein-exec works with Lein 2
2. lein-oneoff can start up REPL, which is rather cool. lein-exec
cannot.
3. lein-oneoff can start up swank, lein-exec doesn't know about swank
4. Let's say we have a file hello.clj with content as follows:
(println "Hello World!")
How long does it take for lein-exec and lein-oneoff to run it?
This is what I got:
tmp shantanu$ time lein oneoff hello.clj
Hello World!
real 0m5.935s
user 0m15.050s
sys 0m0.795s
tmp shantanu$ time lein2 exec hello.clj
Hello World!
real 0m2.115s
user 0m6.809s
sys 0m0.277s
I think the improvements may be due to Leiningen 2.
5. lein-exec supports piping, not sure about lein-oneoff (I couldn't
figure out a way to.)
6. lein-exec can work both with and without project-context. lein-
oneoff works only without project context. This capability is new in
Leiningen 2.
7. In lein-oneoff you specify all dependencies in the beginning using
#_(defdeps ..). In lein-exec you are free to pull in dependencies at
any point in the code.
8. lein-oneoff doesn't preserve the name of the script in *command-
line-args*; lein-exec does.
Hope that helps.
Shantanu
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