Use baked_file_system shard instead of custom implementation

[schovi]

@mperham Got inspired by your idea (because it is awesome to have assets inside binary) and parallely made standalone shard, where I learn some Crystal https://github.com/schovi/baked_file_system

I would be honored if you can give me feedack or even accept this PR .)

[jhass]

Why does it need to be a class now?

[schovi]

Good point. Works absolutly same way :)

[schovi]

I noticed original version of assets had compression and that is reason why tests for assets fail.
Should this be included in baked_file_system?

It can be done as separate functionality

require "baked_file_system"
require "baked_file_system/compress"

module Files
  BakedFileSystem.load("...")
end
file = Files.get("something")
compressed_file = file.compress
compressed_file.read
compressed_file.mime_type
# etc...

edit: nvm. It is compressed inside binary and you decompress it. Good idea. But for saving space, there should be limit for compression. Some small files are bigger when compressed.

[mperham]

Something is wrong with the Travis CI Crystal setup so the build always fails. I don't know who to contact or how to fix.

1. I would like gzip compression support. It halves the size of the web binary, from 3MB to 1.5MB.
2. It would be nice to have Accept-Encoding: gzip support so we could stream the compressed content to the browser without having to uncompress it.

[mperham]

Sorry, first of all: thank you for this work. It's great to see my off-hand comment picked up and developed by someone else thousands of miles away. OSS is so cool!

[mperham]

As for implementing compression, it looks like file outputs the word text or document in files that would compress well, data in files that are more binary. You could use that as a heuristic or simply include a whitelist or blacklist of file extensions.

$ file ~/tax1099k_2014_20150216.pdf 
~/tax1099k_2014_20150216.pdf: PDF document, version 1.7
$ file ~/201507.backup.tbz 
~/201507.backup.tbz: bzip2 compressed data, block size = 900k
$ file README.md 
README.md: ASCII English text
$ file web/assets/javascripts/application.js 
web/assets/javascripts/application.js: UTF-8 Unicode c program text, with very long lines
$ file web/assets/stylesheets/application.css 
web/assets/stylesheets/application.css: ASCII c program text, with very long lines
$ file web/assets/images/logo.png 
web/assets/images/logo.png: PNG image data, 78 x 85, 8-bit/color RGBA, non-interlaced
$ file web/assets/images/favicon.ico 
web/assets/images/favicon.ico: MS Windows icon resource - 2 icons, 16x16, 256-colors

[mperham]

Fixed by 0d9765e