Please support a :quiet option

[tmarble]

Currently there is no way to prevent the output from the println messages in

• https://github.com/emezeske/lein-cljsbuild/blob/master/plugin/src/leiningen/cljsbuild.clj#L86
• https://github.com/emezeske/lein-cljsbuild/blob/master/support/src/cljsbuild/compiler.clj#L72 (also line 83)

Allow me to propose adding a :quiet option to the compiler-options map as demonstrated in

https://github.com/tmarble/lein-cljsbuild/commit/bd4a856c16d39cfef5b0ab8e0e6e50cd7204d6be

[mneise]

Instead of adding another option, I was thinking to replace the println statements with leiningen.core.main/info, leiningen.core.main/warn, or leiningen.core.main/debug. Users could then set LEIN_SILENT to true to suppress info-level and warning-level output and set DEBUG to true to see debug-level output. PRs for this are welcome.

[danielcompton]

This is kind of related to #397 too.

[tmarble]

@mneise I have created PR #418 and setting LEIN_SILENT=true is now effective to silence the output (please see the PR comments).

@danielcompton upon reviewing #397 I believe it is of sufficiently different scope that it doesn't make sense to propose a solution to that bug in this one.