Display errors and warnings in a more human-readable format

[willosborne]

Feature Request

Description of Problem:

Currently validation report is output as a JSON object. We have a --format flag that lets you optionally set JUnit for XML output, but no option for easy human-readable data in a colour-coded table.

I think there's also room for a summary of the errors, so that you can see at a glance how many errors and validations there were.

Potential Solutions:

Add a new output mode that uses a library to display validation in a table, rather than as JSON.
This may not even require a library - see the console.table() method: https://developer.mozilla.org/en-US/docs/Web/API/console/table_static

Coloured labels for errors would also help improve the glance value - one library I found was colors: https://www.npmjs.com/package/colors

[Thels]

Been looking at this on my dev-316 branch - this is what I've got so far - this is using a combination of cliui / chalk and string-table ( which is like console.table() but allows manipulation/interrogation of the generated string )

Currently if you have true under "Issues Found?` it will change colour depending on the current state. Got an error? It will be red - warning? Yellow.

I tried displaying the table of output using cliui too but it really struggles with variable length content from my experiments.