Paste v2 is up!
Published the 2019-12-12

[paste]: https://paste.artemix.org/

In this article, I'm gonna introduce the changes that came with the second major
release of the [paste][paste] ephemeral pastebin tool.

## Changelist

### Refactors

- cleaned up data storage providers and UoWs
- isolated form validation, defined proper types
- optimized view filters
- isolated configuration
- changed router library
- simplified and disambiguated key id format
- unified error handling
- updated code to Go 1.13
- re-wrote the logging

### New features

- integrated second-server prometheus monitoring
- now logging HTTP requests
- now supporting and recommending `.toml` configuration format
- now able to provide the configuration folder path through a CLI argument
- now using a common generic HTTP error page design and format
- now providing a markdown-rendering service

### Deprecated features

- deprecating the `.yaml` configuration format, due to its ambigous format.
    Use `.toml` instead.

## Dev' comment

Paste needed some fresh air, especially since the version was quickly
(i.e. badly) done, with lots of bad practices, clunky code, and hard-to-maintain
choices.

The first step consisted on cleaning pretty much the entire code-base.

Once that was done, I decided to provide the two "small" features:

- the CLI argument, to be able to customize where the configuration would be
searched;
- the prometheus statistics, to be able to have a nice dashboard to look at.

Discussing with a friend made me realise the void that are pastebin tools for
markdown content.
So, I decided to implement a dumb commonmark view, as proof of concept.

Which means that paste now supports Markdown rendering!

The last step was about error pages.

Before this change, you'd end up on a crashed `text/plain; charset=ascii` page
that would just dump the error without anything else.

I decided to make some quick'n'dumb generic HTML error page for 404, 500, etc.