Add support for template plugin

[gernest]

This is implementation of the templates functions plugins based on the discussion on the slack channel.

The design is based on json.

A plugin is a binary/executable that accepts one argument , the name of the function to invoke. The context/payload is written to the stdin of the running plugin command in json format.

The json payload has format { "data" : SOME_VALUE } where SOME_VALUE is any valid json object.

The plugin runner expect the plugin to write to stdout the output after processing the payload, the format of the json output is the same as json input.

TODO:

• [x] send json payload in stdin
• [x] custom/default plugin directory
• [x] documentation

[gernest]

@natefinch please take a look if you get time. I think the PR is complete!

[natefinch]

Awesome. Thanks!

On Thu, Sep 21, 2017, 7:08 AM Geofrey Ernest notifications@github.com wrote:

@natefinch https://github.com/natefinch please take a look if you get time. I think the PR is complete!

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[gernest]

Done , awaiting #41 to do further tests.

[gernest]

@natefinch I have tested with #42 the relative paths works like a charm, same to absolute paths. I hope I addressed all requested changes.

[gernest]

Ping

[natefinch]

3 tiny docs changes and we're good! :)

[gernest]

Done

[natefinch]

This is really really awesome work. I just tried it out locally. It's so cool. Thanks for all your work on this!