Command aliases about lets HOT 4 CLOSED

Hi, I like this idea. Is seems like @ identifier can be safely used as an accessor to aliases.

Also, I have another idea to reach the same result.
We can basically have some kind of pre command (just like before-script in gitlab-ci.yaml).
What it does is just execute some bash (sh) before an actual command so the result is accessible from actual cmd.

How it might look like:

shell: bash

before: |
  function my_docker() {
    docker run --rm -v ${PWD}:/go/src/app helloworld "$@"
  }

commands:
  run:
    cmd: my_docker go test

But, as I can tell, its a bit different from an aliases idea. Its rather a bash script including.

Anyway, aliases seem ok and feels like it solves the problem

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Also, I was thinking about an alias field for a command. It could help with migrations from old to new commands. Just thinking if it's wouldn't interfere with aliases global directive

commands:
  old-run:
    alias: run
    cmd: node app.js

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Wow. concernedly:

1. Proposal about bash pre scripts - I strongly support this feature `cause it provides much more flexible functionality;
2. Directive alias: maybe, it would be even a better idea to allow multiple aliases? Like:

commands:
  upgrade:
    cmd: alembic upgrade head
    aliases:
      - migrate
      - apply
      - up

from lets.

Implemented before directive (similar to gitlab ci before_script)

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