Can I supply config variables on the command line?

[halloleo]

Sometimes I want to view the diff in VS Code, sometimes in emacs.

Can I supply diff.command via an environment variable or somehow via a "meta option" on the command line, so that for this one execution I don't have to change the config file?

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[twpayne]

Currently there is no way to override configuration variables in a generic way. Some specific configuration variables can be overridden with their specific flags (e.g. the interactive config variable and the --interactive flag), but most configuration variables cannot be overridden.

I agree that being able to override any config variable with a command line flag would be a valuable improvement to chezmoi.

Note that when you're using a custom diff.command you might also have to set diff.args and diff.pager, i.e. you might need to override multiple variables at the same time.

In the short term you could use two different config files, one with diff.command set to code and a second with diff.command set to emacs, and then use the -c / --config option, but I admit that this is messy.

[halloleo]

Thanks @twpayne. I might put in the config my own diff command which (based on a ENV var) calls either code or emacs.

[twpayne]

I'll track this in #4634.