feat: support pre-compressed-assets

[curbengh]

Serve pre-compressed assets when found, else fallback to dynamic compression (when both compress and pre_compressed are enabled).

compress is independent from pre_compressed, so either one can be enabled.

Adapted from pre-compressed-assets middleware plus this fix, with es6 syntax and utilize hexo router (instead of node-glob).

[curbengh]

WIP, haven't add test case.

[coveralls]

Coverage decreased (-2.6%) to 92.771% when pulling 40fe06df25e5d914292e9dcd2743721d6dbf7948 on curbengh:pre-compressed into a146d2dcb9333be8409afd4f238824bb04daa722 on hexojs:master.

[coveralls]

Coverage decreased (-3.8%) to 90.291% when pulling 36ce99ba669213c6ddc52beb3291efc4efacdaf5 on curbengh:pre-compressed into fc029327d359d051d1c137a0297e8dbafb61b192 on hexojs:master.

[SukkaW]

I don't see how pre-compressed files can be served in hexo-server. I mean, most of the theme doesn't provide pre-compressed js & css.

[curbengh]

With a compression plugin like hexo-yam.

How to test:

package.json
-  "hexo-server": "^1.0.0"
+  "hexo-server": "curbengh/hexo-server#pre-compressed",
+  "hexo-yam": "^3.1.0"

_config.yml
+server:
+  pre_compressed: true

$ rm -r node_modules/
$ npm i
$ hexo s

Check response header.

[curbengh]

Added test.

[curbengh]

not compatible with https://github.com/hexojs/hexo-server/pull/111 yet

---

fixed https://github.com/hexojs/hexo-server/pull/100/commits/40fe06df25e5d914292e9dcd2743721d6dbf7948

[tomap]

I would say that hexo-server is a debug server only, not a prod server. Should absolutely not be used to serve a site except for testing!

So in that context, really no need to have compression, pre compression, ....