Support for deps tools instead of lein

[holyjak]

With this change you can use clj-new
(or still lein new) and then use the
clojure CLI instead of leiningen to build/
serve the site.

An advantage is that it is possible to switch
to versions of libraries based on local paths or
git URLs and SHAs.

[holyjak]

I have no experience with lein new so I do not know how to test the changes. Any guidance welcome!

[bombaywalla]

Thanks for this PR.

I tested to check whether the lein and clj versions generate the same HTML files, by doing the following:

git clone https://github.com/holyjak/cryogen
cd cryogen
git checkout --track origin/feat/deps-edn
lein new cryogen foobar
cd foobar
lein run
mv public public-lein
clj -M:build
diff -r public public-lein

The results were the same (except for timestamps).

[bombaywalla]

Would you please make the following changes to this PR.

1. Add .lein-failures to the .gitignore file. Might also want to add the other lein-related ignore lines.
2. Add the clj commands to the README.md in the appropriate places. clj -M:build near the lein run and clj -X:serve near the lein ring server.

[bombaywalla]

I'd be okay merging this PR with the above changes.

Separately, wondering whether it might be a good idea to use the lein-tools-deps plugin so that there is only one place to update any dependencies. Currently, if any dependencies change, they will need to be updated in the generated project.clj and in the deps.edn.

[holyjak]

Thanks a lot! Done.

I am not sure how well the lein-tools-deps plugin works and did not want to risk causing any problems.

[bombaywalla]

Agree on lein-tools-deps for now.