cd to the root of a git repo, even from .git or from submodules (bash)

cd-to-git-root.sh

# Edit as noted below, then source this from your .bashrc, or paste it in there.  Then
#    cdgr
# will move you to the root of the current git repo (if any).
# If you are in a submodule, it will move you to the top of the containing repo.

# Edits:
#  - If you are not on Cygwin, remove line 16
#  - If you are on Cygwin, change YOUR_USERNAME on line 16 to ... your username ;) .
#    This is to map from /cygdrive paths back to Cygwin-native paths.

function cdgr_munge_dirs() {
    sed '
        s#^true$#'"${PWD%%/.git*}"'# ;

        1 {
            s#/cygdrive/c/Users/YOUR_USERNAME#'"$HOME"'#i ;
            q
        }'
}

alias cdgr='cd "$(git rev-parse --show-superproject-working-tree --show-toplevel --is-inside-git-dir | cdgr_munge_dirs)"'