fix(server-cache): must match exact alias

[curbengh]

What does it do?

Improve compatibility with 3rd-party console plugins that start with an 's'.

By default, server command has the following alias (using abbrev):

• 's'
• 'se'
• 'ser'
• ...
• 'server'

However, if there is a 3rd-party console that also starts with an 's', like 'save', 'server' will no longer have 's' alias; instead, its alias will start with 'se'. Another example is 'selenium', 'server' alias will start with 'ser'.

These examples illustrate cmd.startsWith('s') might match other commands than the intended 'server'.

How to test

git clone -b abbrev-compat https://github.com/hexojs/hexo.git
cd hexo
npm install
npm test

Pull request tasks

• Add test cases for the changes.
• Passed the CI test.

[coveralls]

Coverage remained the same at 97.828% when pulling e98d9ed on curbengh:abbrev-compat into 65961d3 on hexojs:master.

[SukkaW]

Suggested change

	if (Object.keys(alias).filter(key => alias[key] === 'server').includes(this.env.cmd) && cache) {
	if (alias[this.env.cmd] === 'server' && cache) {

It is much simpler, and could do the same job.

[curbengh]

👍