git grep and git blame. two great tastes that taste great together

gistfile1.sh

# from i8ramin - http://getintothis.com/blog/2012/04/02/git-grep-and-blame-bash-function/
# runs git grep on a pattern, and then uses git blame to who did it
ggb() {
    git grep -n $1 | while IFS=: read i j k; do git blame -L $j,$j $i | cat; done
}

# small modification for git egrep bash
geb() {
    git grep -E -n $1 | while IFS=: read i j k; do git blame -L $j,$j $i | cat; done
}

usage looks like ggb "someClass" or geb "[[:space:]]+$"

Combine with awk for a simple scoreboard:
geb "[[:space:]]+$" | awk '{author = $2 " " $3; lines[author] += 1 } END { for (author in lines) { printf "%s: %d\n", substr(author, 2), lines[author]}}'

Very nice trick, I've used it to grep and blame all occurrences of #if 0 in Godot Engine and cleanup some dead code, that's quite efficient.

I tweaked ggb() a bit to show the filename and support spaces in the argument:

ggb() {     git grep -n "$1" | while IFS=: read i j k; git blame -L $j,$j $i | cat | sed 's|^|'$i':\t|'; done; }

(I know my sed is ugly and it could likely be done more cleverly with awk or similar, but it does the trick)

what is the purpose of using cat?

Love it

A little -f makes sure the file name is always printed, and cat is not necessary:

ggb() { git grep -n "$1" | while IFS=: read i j k; do git blame -f -L $j,$j $i; done }

fish shell:

function git_grep_blame -d "git grep + git blame"
    set -l IFS :
    command git grep -En $argv[1] | while read -l file line code
        git blame -f -L $line,$line $file | grep -E --color "$argv[1]|\$"
    end
end

Love the fish shell, thanks! Unfortunately, can't pass grep arguments.

I use this alias in .gitconfig:

grame = "!r() { git grep -n $1 $2 | while IFS=: read i j k; do echo $i; git blame -f -L $j,$j $i; done }; r"

(To see the filename, I added echo $i to @henrik242's command mentioned above.)