support for multiple config files (#2210)

[pirtleshell]

Give the --config flag support for multiple config files when generating or serving your site.

Inspired by Jekyll as suggested by @Lindsor in #2210.

Usage

List the desired config files (JSON or YAML) in a comma-separated list (no spaces) after the config flag:

hexo server --config config1.yml,config2.json

This will combine all the config files and save the merged settings to _multiconfig.yml. The later values take precedence. It works with any number of JSON and YAML files with arbitrarily deep objects.

For instance, in the above example if foo: bar is in config1.yml, but "foo": "dinosaur" is in config2.json, _multiconfig.yml will contain foo: dinosaur.

[coveralls]

Coverage increased (+0.003%) to 97.13% when pulling dbfd8d9 on PirtleShell:multiconfig into ceee832 on hexojs:master.

[pirtleshell]

I'm unable to reproduce the appveyor errors on my machine with the same node and npm versions. This may be a Windows error? Can anyone confirm?

$ npm install
......
$ node -v
v0.12.16
$ npm -v
3.10.8
$ npm test
......
  812 passing (7s)
  7 pending

[NoahDragon]

I will take a look at it sometime later to see if I can reproduce the error..

[NoahDragon]

I think this issue is caused by the AppVoyer's user permission. It works fine on my computer.

We have to fix it before merging, otherwise, this error will repeat every time.

Could you please try to fix it?

[pirtleshell]

I'll see what I can do tonight. In the tests, I check for appropriate warnings by reading the debug log, but it looks like Appveyor doesn't give itself permission to read that file... Thanks for looking into it!

[coveralls]

Coverage increased (+0.005%) to 97.132% when pulling 9b0facc on PirtleShell:multiconfig into ceee832 on hexojs:master.

[coveralls]

Coverage increased (+0.005%) to 97.132% when pulling efe40f9 on PirtleShell:multiconfig into ceee832 on hexojs:master.

[coveralls]

Coverage increased (+0.005%) to 97.132% when pulling c47f4e8 on PirtleShell:multiconfig into afe0bb1 on hexojs:master.

[coveralls]

Coverage increased (+0.005%) to 97.132% when pulling c47f4e8 on PirtleShell:multiconfig into afe0bb1 on hexojs:master.

[pirtleshell]

Well that's aggravating. Many of the Console tests timedout and thus failed.

This PR does not affect the Console submodule. These same tests passed in the previous commit and the only things that changed were some semicolons and new lines added to a test file that happens after the console tests are run.

I'm just going to force an update and see if it works...

[coveralls]

Coverage increased (+0.005%) to 97.132% when pulling c63a90c on PirtleShell:multiconfig into afe0bb1 on hexojs:master.

[NoahDragon]

Great work, LGTM.

[NoahDragon]

Tested and works well. Good job!

Usage suggestion:

1. Run hexo g with config file first;
2. Then run hexo s with config file accordingly.

E.g.

hexo g --config ./config1.yml ./config2.yml
hexo s --config ./config1.yml ./config2.yml