Output the configured engine in version option

[yhatt]

Improve --version (-v) option to output the version of engine based on the current configuration / arguments.

Cases

Default

$ marp -v
@marp-team/marp-cli v0.0.14 (/w bundled @marp-team/marp-core v0.2.1)

Use engine specified by package name

$ npm install @marp-team/marpit --save-dev
$ marp -v --engine @marp-team/marpit
@marp-team/marp-cli v0.0.14 (/w customized engine in @marp-team/marpit v0.3.3)

Use engine specified by JS file in your project

$ marp -v --engine ./your-engine.js
@marp-team/marp-cli v0.0.14 (/w customized engine in your-project v1.0.0)

Use functional engine

$ npm install @marp-team/marp-core --save-dev
$ echo "const { Marp } = require('@marp-team/marp-core'); module.exports={engine: opts => new Marp(opts)}" > conf.js
$ marp -v -c ./conf.js
@marp-team/marp-cli v0.0.14 (/w customized engine)

ToDo

• Add test
  • Specify the installed engine (=> show package name and version)
  • Specify the functional engine (=> show as using customized engine)