Feature Request: More granular config printing options with ghostty +show-config

[archcorsair]

Current Behavior

Currently, running ghostty +show-config prints all the "changes-only" keys in the configuration. While helpful, this can be inconvenient if you're only interested in the value of a specific key.

Request

It would be beneficial to have more granular control over what configuration information is displayed. I propose the following:

• Ability to specify a key: Allow users to specify a single configuration key to display its value
• Option to show default values: Add the --default flag to display the default value of a given key

Example

# Show the current value of the 'font-family' key
ghostty +show-config font-family

# Show the default value of the 'font-size' key
ghostty +show-config font-size --default

Benefits

• Usability: Makes it easier to quickly find the value of a specific configuration option
• Debugging: Helps users identify discrepancies between their current configuration and the default settings
• Clarity: Provides a more concise and focused output when inspecting configuration values

[jparise]

I like the idea of being able to show the details for a single configuration key (or maybe also a list/pattern).

I was actually looking for something similar recently when I was considering adding a "look up the documentation for the configuration key under the cursor" command to our bundled vim plugin. This would make it pretty easy to implement that.