Coursier

1.1.0-M13-1

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Extra

Direct former README import (possibly not up-to-date)

Printing trees

E.g. to print the dependency tree of io.circe:circe-core:0.4.1,

$ coursier resolve -t io.circe:circe-core_2.11:0.4.1
  Result:
└─ io.circe:circe-core_2.11:0.4.1
   ├─ io.circe:circe-numbers_2.11:0.4.1
   |  └─ org.scala-lang:scala-library:2.11.8
   ├─ org.scala-lang:scala-library:2.11.8
   └─ org.typelevel:cats-core_2.11:0.4.1
      ├─ com.github.mpilquist:simulacrum_2.11:0.7.0
      |  ├─ org.scala-lang:scala-library:2.11.7 -> 2.11.8
      |  └─ org.typelevel:macro-compat_2.11:1.1.0
      |     └─ org.scala-lang:scala-library:2.11.7 -> 2.11.8
...

From SBT, with sbt-coursier enabled, the command coursierDependencyTree prints the dependency tree of the various sub-projects,

> coursierDependencyTree
io.get-coursier:coursier_2.11:1.0.1-SNAPSHOT
├─ com.lihaoyi:fastparse_2.11:0.3.7
|  ├─ com.lihaoyi:fastparse-utils_2.11:0.3.7
|  |  ├─ com.lihaoyi:sourcecode_2.11:0.1.1
|  |  |  └─ org.scala-lang:scala-library:2.11.7 -> 2.11.8
|  |  └─ org.scala-lang:scala-library:2.11.7 -> 2.11.8
|  ├─ com.lihaoyi:sourcecode_2.11:0.1.1
|  |  └─ org.scala-lang:scala-library:2.11.7 -> 2.11.8
|  └─ org.scala-lang:scala-library:2.11.7 -> 2.11.8
├─ org.jsoup:jsoup:1.9.2
...

Note that this command can be scoped to sub-projects, like proj/coursierDependencyTree.

The printed trees highlight version bumps, that only change the patch number, in yellow. The 2.11.7 -> 2.11.8 above mean that the parent dependency wanted version 2.11.7, but version 2.11.8 landed in the classpath, pulled in this version by other dependencies.

They highlight in red version bumps that may not be binary compatible, changing major or minor version number.

Generating bootstrap launchers

The coursier bootstrap command generates tiny bootstrap launchers (~30 kB). These are able to download their dependencies upon first launch, then launch the corresponding application. E.g. to generate a launcher for scalafmt,

$ coursier bootstrap com.geirsson:scalafmt-cli_2.11:0.2.3 -o scalafmt

This generates a scalafmt file, which is a tiny JAR, corresponding to the bootstrap sub-project of coursier. It contains resource files, with the URLs of the various dependencies of scalafmt. On first launch, these are downloaded under ~/.coursier/bootstrap/com.geirsson/scalafmt-cli_2.11 (following the organization and name of the first dependency - note that this directory can be changed with the -D option). Nothing needs to be downloaded once all the dependencies are there, and the application is then launched straightaway.

Credentials

To use artifacts from repositories requiring credentials, pass the user and password via the repository URL, like

$ coursier fetch -r https://user:pass@company.com/repo com.company:lib:0.1.0

From SBT, add the setting coursierUseSbtCredentials := true for sbt-coursier to use the credentials set via the credentials key. This manual step was added in order for the credentials setting not to be checked if not needed, as it seems to acquire some (good ol') global lock when checked, which sbt-coursier aims at avoiding.

Extra protocols

By default, coursier and sbt-coursier handle the http://, https://, and file:// protocols. It should also be fine by protocols supported by java.net.URL (not thoroughly tested). Support for other protocols can be added via plugins. coursier-s3, a plugin for S3, is under development, and illustrates how to write such plugins.

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