Wrapper functions for cd and git to swtich SSH hosts on "git clone" depending on which directory you are in

git-account-switcher.sh

# What this does
# Switch SSH hosts on "git clone" depending on where you run it:
# Run "git clone" in a subdirectory of "work" -> Your work account clones the repo
# Run "git clone" in a subdirectory of "private" -> Your private account clones the repo

# How to configure
# 1. Create directories ~/work and ~/private
# 2. Configure SSH hosts in ~/.ssh/config and set public keys to your Github accounts
# 3. Define these functions in an rc file (.bashrc or whatever you are using)
# 4. Modify environment variables below
# 5. (Optional) Create ~/.scripts/git-set-gpg-key.sh with https://gist.github.com/KeyAmam/74d4aefcd161410bf1487714b829a6ce and uncomment line 68 below.
# 6. Run source command (Nothing happens)
# You can run "type git" and "echo $GIT_PARENT_DIR_BASENAME" to see if those functions are configured properly

# Note
# This script doesn't work well with specifying a target directory on git clone
# Make sure you are in a directory you want to clone to and run git clone
# To prevent it from overriding the default behavior in ~/private and ~/work,
# use --force-url option like so:
# git clone --force-url [email protected]:some_user/some_repo.git

GIT_USER_NAME_WORK='work user'
GIT_USER_EMAIL_WORK='work email'
GIT_SSH_NAME_WORK='github_w'

GIT_USER_NAME_PRIVATE='KeyAmam'
GIT_USER_EMAIL_PRIVATE='[email protected]'
GIT_SSH_NAME_PRIVATE='github_p'

WORK_DIR_BASENAME='work'
PRIVATE_DIR_BASENAME='private'

function __clone() {
    local git_parent_dir="$1"; shift

    case $git_parent_dir in
        work)
            local git_user_name="$GIT_USER_NAME_WORK"
            local git_user_email="$GIT_USER_EMAIL_WORK"
            local git_ssh_name="$GIT_SSH_NAME_WORK"
            ;;
        private)
            local git_user_name="$GIT_USER_NAME_PRIVATE"
            local git_user_email="$GIT_USER_EMAIL_PRIVATE"
            local git_ssh_name="$GIT_SSH_NAME_PRIVATE"
            ;;
        *)
            ;;
    esac

    if ! printf '%s\n' "$@" | grep -q '^--force-url$'; then
        # Replace the first occurrence of "[email protected]" with GIT_SSH_NAME_REPLACED_WITH and reassign $@
        # GIT_SSH_NAME_REPLACED_WITH is passed from define_git() 
        set -- $(echo "$@" | sed "s/[email protected]/$git_ssh_name/")
        echo -e "  URL overridden: git $@"
    fi

    # git clone
    command git "$@" &&
        # navigate to root dir of repo
        cd $(basename ${1%.*}) &&
            # configure .git/config
            (
                command git config --local user.name "$git_user_name"
                command git config --local user.email "$git_user_email"
                command git config --local url."$git_ssh_name".insteadOf "[email protected]"
                # if you want to set gpg key to git, put this gist() to ~/.scripts/git-set-gpg-key.sh and uncomment below
                # ~/.scripts/git-set-gpg-key.sh
            )
}

function define_git() {
    # defined globally since used in nested definition
    GIT_PARENT_DIR_BASENAME="$1"

    if [ -z "$GIT_PARENT_DIR_BASENAME" ]; then
        # if GIT_SSH_NAME_REPLACED_WITH is not specified, put back to default behavior
        function __git() {
            command git "$@"
        }
    else
        function __git() {
            # $1 and $@ are different from those of define_git()
            # When running git clone without --force-url
            if [[ "$1" == "clone" ]]; then
                __clone "$GIT_PARENT_DIR_BASENAME" "$@"
            else
                command git "$@"
            fi
        }
    fi

    alias git=__git
}

function __cd () {
    command cd "$@"
    # if subdirectory of "work"
    if [[ "${PWD#$HOME/$WORK_DIR_BASENAME}" != "$PWD" ]]; then
        define_git "$WORK_DIR_BASENAME"
    # if subdirectory of "private" 
    elif [[ "${PWD#$HOME/$PRIVATE_DIR_BASENAME}" != "$PWD" ]]; then
        define_git "$PRIVATE_DIR_BASENAME"
    # unless subdirectory of "work" or "private"
    else
        # put back to default behavior
        define_git
    fi
}

alias cd=__cd