Allow platform dependencies

[kbx81]

What does this implement/fix?

Small PR that enables the ability to specify platform dependencies. For example:

DEPENDENCIES = ["ota.esphome"]

...would require the platform esphome be present within the ota component configuration:

ota:
  - platform: esphome

This enables more user-friendly validation errors should a required platform not be present.

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other

Related issue or feature (if applicable): fixes

Pull request in esphome-docs with documentation (if applicable): esphome/esphome-docs#

Test Environment

• ESP32
• ESP32 IDF
• ESP8266
• RP2040
• BK72xx
• RTL87xx

Example entry for config.yaml:

# Example config.yaml

Checklist:

• The code change is tested and works locally.
• Tests have been added to verify that the new code works (under tests/ folder).

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated in esphome-docs.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 27.27273% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 53.44%. Comparing base (4d8b5ed) to head (e9e2803).
Report is 481 commits behind head on dev.

Files	Patch %	Lines
esphome/config.py	27.27%	5 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #6623      +/-   ##
==========================================
- Coverage   53.70%   53.44%   -0.27%     
==========================================
  Files          50       50              
  Lines        9408     9554     +146     
  Branches     1654     1687      +33     
==========================================
+ Hits         5053     5106      +53     
- Misses       4056     4135      +79     
- Partials      299      313      +14     

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[nielsnl68]

Nice idea @kbx81, is there a reason why you choose "esphome.ota" and not "ota.esphome"? To me the last version makes more sense to me. But maybe you have something else in mind that makes it easier to extend this later on?

[kbx81]

Nice idea @kbx81, is there a reason why you choose "esphome.ota" and not "ota.esphome"? To me the last version makes more sense to me. But maybe you have something else in mind that makes it easier to extend this later on?

It was sort of arbitrary -- but it seems we use this arrangement for the logger tags, so I just copied that. It's trivial to change, so if we agree we should swap platform.component for component.platform, I've got no issues with that. 😄

[kbx81]

I have switched it to use component.platform syntax as I generally think it makes more sense here. Also added some additional logic to better handle various types of config errors.