Usage:
  semver bump (major|minor|patch|release|prerel <prerel>|build <build>) <version>
  semver compare <version> <other_version>
  semver get (major|minor|patch|release|prerel|build) <version>
  semver --help
  semver --version

Arguments:
  <version>  A version must match the following regex pattern:
             \"${SEMVER_REGEX}\".
             In english, the version must match X.Y.Z(-PRERELEASE)(+BUILD)
             where X, Y and Z are positive integers, and PRERELEASE and BUILD
             are optional strings composed of alphanumeric characters, dots,
             hyphens and underscores.

  <other_version>  See <version> definition.

  <prerel>  String that must be composed of alphanumeric characters, dots,
            hyphens and underscores.

  <build>   String that must be composed of alphanumeric characters, dots,
            hyphens and underscores.

Options:
  -v, --version          Print the version of this tool.
  -h, --help             Print this help message.

Commands:
  bump     Bump <version> by one of major, minor, patch, release, prerel, build.
           The bumped version is output to stdout.

  compare  Compare <version> with <other_version>, output to stdout the
           following values: -1 if <other_version> is newer, 0 if equal, 1 if
           older.

  get      Extract given part of <version>, where part is one of major, minor,
           patch, release, prerel, build.

$ semver bump patch 0.1.0
0.1.1
$ semver bump minor 0.1.1
0.2.0
$ semver bump patch 0.2.0
0.2.1
$ semver bump major 0.2.1
1.0.0
$ semver bump patch 1.0.0
1.0.1
$ semver bump prerel rc1.1.0 1.0.1
1.0.1-rc1.1.0
$ semver bump build build.051 1.0.1-rc1.1.0
1.0.1-rc1.1.0+build.051
$ semver bump release 0.1.0-SNAPSHOT
0.1.0

$ semver compare 1.0.1-rc1.1.0+build.051 1.0.1
-1
$ semver compare 1.0.1-rc1.1.0+build.051 1.0.1-rc1.1.0
0
$ semver compare 1.0.1-rc1.1.0+build.051 1.0.1-rc1.1.0+build.052
0
$ semver compare 1.0.1-rc1.1.0+build.051 1.0.1-rb1.1.0
1
$ semver compare 10.1.4-rc4 10.4.2-rc1
-1

$ semver get patch 1.2.3
3
$ semver get minor 1.2.3
2
$ semver get major 1.2.3
1
$ semver get release 1.2.3-rc.4
1.2.3
$ semver get release 1.2.3+build.567
1.2.3
$ semver get prerel 1.2.3-rc.4
rc.4
$ semver get prerel 1.2.3-alpha.4.5
alpha.4.5
$ semver get build 1.2.3-rc.4+build.567
build.567