I use the standard grep command a lot. When I execute it, the minibuffer is populated with the following the text, allowing me to complete the command:
Run grep (like this): grep --color -nH --null -e
I almost always prefer to use Perl regex and ignore casing, so I'm finding myself replacing the last argument very often like so:
Run grep (like this): grep --color -nH --null -Pi
I would like to change the behavior of grep so that it loads with the argument -Pi instead of -e by default.
When I use describe-function and inspect grep, I can see the lines (in /usr/share/emacs/26.3/lisp/progmodes/grep.el.gz) that define this behavior. Beginning line 650, there is a codeblock like so:
(let ((grep-options
(concat (if grep-use-null-device "-n" "-nH")
(if grep-use-null-filename-separator " --null")
(if (grep-probe grep-program
`(nil nil nil "-e" "foo" ,null-device)
nil 1)
" -e"))))
(...
How do I override these grep-options in my Emacs config? I cannot find a variable named grep-probe or grep-options which I could just overwrite, for example, so what's the best practice then?
