Providing the command argument from a config file does not work

[simonmichael]

When a command argument is not provided on the command line, but in the general section of a config file, I expected that it would be used as the command, but is not; rather it is ignored. (Reported by sol in chat.)

CLI parsing is already complicated, so implementing this is tricky. If it worked,

• it would restrict hledger to that one command when using that config file
• a command-specific config file section for that command would also take effect
• any command-specific sections for other commands would be ignored.

As a workaround, you can achieve the same effect by making the config file a shebang script and adding the command argument to the shebang line.

But it may seem surprising/inconsistent that this doesn't work. We should implement it or document it.

[simonmichael]

Documented for now.

[simonmichael]

This now works in master.