Instead of `yay -<op> --help` printing the entire help message, it will
now print a contextual help message based on the operation being
performed. The top-level help message shows available operations and
global flags as before. It no longer shows operation-specific flags and
`pacman -S --help` output. Like the pacman output, it shows that you can
get operation-specific help by running `yay -<op> --help`.
The operation-specific help message shows the operation's flags and all
pacman operation flags pass through to pacman.
fix(parser): ensure data is piped when using '-' argument
Fixes#1626.
Check to see if data was actually piped to yay, otherwise it will hang
forever. This error will give users better feedback of how to use the
'-' argument (it is also the same exact error pacman throws for invalid
piped data).
Two tests were added. However, I didn't know how to add a test for the
actual part that detects whether data was piped or not (which is
essentially what this commit adds).
Joey Holtzman