set_up_homebrew.sh

#!/bin/bash
set -ue
NEW_BREW_PREFIX="local"

if [[ $PATH == */usr/stsci/*ssb* ]]
then
    echo "There's an SSB environment activated (ssbdev, ssbx, or ssbrel)."
    echo "Things could go unpredictably if this script were to continue. Try running without a Ureka / SSB environment activated."
    exit 1
fi

if [[ $(which ruby) != "/usr/bin/ruby" ]]
then
    echo "Ruby wasn't found in the default location. Perhaps you've customized things?"
    exit 1
fi

cd
destination="$HOME/$NEW_BREW_PREFIX/homebrew"
if [ -d $destination ];
then
    echo "There's already something in $destination"
    echo "Remove $HOME/$NEW_BREW_PREFIX to get a fresh start"
    exit 1
fi

echo "Copying the Homebrew package manager into $destination"
git clone https://github.com/Homebrew/homebrew.git $destination

mkdir -p "$HOME/$NEW_BREW_PREFIX/bin" \
    "$HOME/$NEW_BREW_PREFIX/share/man/man1" \
    "$HOME/$NEW_BREW_PREFIX/etc"

ln -s "$HOME/$NEW_BREW_PREFIX/homebrew/bin/brew" \
    "$HOME/$NEW_BREW_PREFIX/bin/brew"

ln -s "$HOME/$NEW_BREW_PREFIX/homebrew/share/man/man1/brew.1" \
    "$HOME/$NEW_BREW_PREFIX/share/man/man1/brew.1"

export PATH="$HOME/$NEW_BREW_PREFIX/bin:$PATH"

brew --version
brew tap homebrew/homebrew-science

echo "
setenv _old_PATH \"$PATH\"
setenv PATH \"\$HOME/$NEW_BREW_PREFIX/bin:\$PATH\"
setenv _old_MANPATH \"$MANPATH\"
setenv MANPATH \"\$HOME/$NEW_BREW_PREFIX/share/man:\$MANPATH\"" > "$HOME/$NEW_BREW_PREFIX/bin/brew_activate.csh"

echo "
setenv PATH \$_old_PATH
unsetenv _old_PATH
setenv MANPATH \$_old_MANPATH
unsetenv _old_MANPATH" > "$HOME/$NEW_BREW_PREFIX/bin/brew_deactivate.csh"

echo
echo
echo "***** Install complete *****"
echo
echo "If you use tcsh/csh (the default at the Institute), add an alias
to ~/.cshrc:

alias brew_activate \"source $HOME/$NEW_BREW_PREFIX/bin/brew_activate.csh\"
alias brew_deactivate \"source $HOME/$NEW_BREW_PREFIX/bin/brew_deactivate.csh\"

If you use bash (the default everywhere else), add a function
to ~/.bash_profile:

brew_activate() {
  export _old_PATH=\"\$PATH\"
  export PATH=\"\$HOME/$NEW_BREW_PREFIX/bin:\$PATH\"
  export _old_MANPATH=\"\$MANPATH\"
  export MANPATH=\"\$HOME/$NEW_BREW_PREFIX/share/man:\$MANPATH\"
}

brew_deactivate() {
    export PATH=\"\$_old_PATH\"
    unset _old_PATH
    export MANPATH=\"\$_old_MANPATH\"
    unset _old_MANPATH
}

Then, open a new shell. Type 'brew_activate' to add Homebrew to the path.

You can add brew_activate to the end of your shell rc file (.bashrc,
.bash_profile, or .cshrc) to ensure the 'brew' command is always available."