Considering add log.format and show.format configure option

Hi forks,

People including me are asking feature to use different format for log and show:

https://stackoverflow.com/questions/20579889/different-pretty-formats-for-git-log-and-git-show https://stackoverflow.com/questions/37898232/make-different-pretty-settings-for-git-log-and-git-show

Can we consider add such option to git-config

[format]
    mylogformat = <...>
    myshowformat = <...>
[log]
    format = mylogformat
[show]
    format = myshowformat

Which should work same as

git log --format=mylogformat git show --format=myshowformat