patch_profile

#!/bin/sh

check_previous_patch() {
    if grep -q 'Setting PATH for JRuby' "$1"
        then return 1
    fi
    return 0
}

declare -x PR

# add current directory to the user's profile
if [ `id -ur` = 0 ]; then
    # Run from the installer, do some trickery to fetch the information
    # we need.
    theShell="`finger $USER | grep Shell: | head  -1 | awk '{ print $NF }'`"
else
    theShell="${SHELL}"
fi

BSH="`basename "${theShell}"`"
case "${BSH}" in
*csh)
    if [ -f "${HOME}/.tcshrc" ]; then
        PR="${HOME}/.tcshrc"
    else
        PR="${HOME}/.cshrc"
    fi
    ;;
bash)
    if [ -e "${HOME}/.bash_profile" ]; then
        PR="${HOME}/.bash_profile"
    elif [ -e "${HOME}/.bash_login" ]; then
        PR="${HOME}/.bash_login"
    elif [ -e "${HOME}/.profile" ]; then
        PR="${HOME}/.profile"
    else
        PR="${HOME}/.bash_profile"
    fi
    ;;
*sh)
    PR="${HOME}/.profile"
    ;;
esac

# Create backup copy before patching
patch_profile() {
    if [ -f "${PR}" ]; then
        cp -fp "${PR}" "${PR}.jrubysave"
    fi
    echo "" >> "${PR}"
    echo "# Setting PATH for JRuby ${JRUBYVER}" >> "${PR}"
    echo "# The orginal version is saved in `basename ${PR}`.jrubysave" >> "${PR}"
    echo 'PATH="${PATH}:'"${JRUBY_CURRENT_PATH}/bin"'"' >> "${PR}"
    echo 'export PATH' >> "${PR}"
    if [ `id -ur` = 0 ]; then
        chown "${USER}" "${PR}"
    fi
}

try_patch_profile() {
    check_previous_patch $PR
    if [ $? -eq 0 ]
    then
        patch_profile
    fi
}

try_revert_patch() {
    check_previous_patch $PR
    patched=$?
    if [ $patched -eq 1 ]
    then
        if [ -f "${PR}.jrubysave" ]
        then
            cp -fp "${PR}.jrubysave" "${PR}"
        else
            sed -iE '/JRuby/,/export/d' ${PR}
        fi
    fi
}