Git diff -S to show only lines that match

Question

I'm using this git hook for preventing commits that include non-ascii characters.

When I find a non-ascii character, I want to print only the line with the character (and if possible the filename and line number too)

git --no-pager diff HEAD -S$char -U0

The --unified option will show all changes in the file, but I just want to show the lines -S found.

Answer 1

I want to print only the line with the character (and if possible the filename and line number too)

This is not exactly a diff format, but you can easily get what you want by adding xargs and grep to the mix:

%git diff --name-only -S"$char"|xargs grep -n "$char" /dev/null
module/main/src/main/java/Scratchpad.java:33:    public void Reßet() {

With GNU grep, you can replace grep -n "$char" /dev/null with grep -Hn "$char"