#!/bin/bash
#
# develop_brew_cask
#

set -e;              # exit on any uncaught error
set +o histexpand;   # don't expand history expressions

tap_subdir="Library/Taps/phinze-cask"

if [[ $1 =~ ^-+h(elp)?$ ]]; then
    printf "develop_brew_cask

   Symlink private repo directories into Homebrew's Cellar, so
   that the 'brew cask' command will use the current development
   branch in your private repo.

   Saves the production Homebrew directories under new names.

   You can reverse this operation with 'production_brew_cask'.

   Note: it is not safe to run 'brew update' while development
   mode is in effect.

"
    exit
fi

script_dir="$(/usr/bin/dirname $0)"
cd "$script_dir"

git_root="$(git rev-parse --show-toplevel)"
brew_prefix="$(brew --prefix)"
cellar_dir="$brew_prefix/Cellar/brew-cask"
version_dir=$(/bin/ls "$cellar_dir/" | sort | tail -1)
tap_dir="$brew_prefix/$tap_subdir"

# sanity check
if [[ $(/usr/bin/stat -L -f '%i' "$tap_dir") -eq $(/usr/bin/stat -L -f '%i' "$git_root") ]]; then
    printf "\nERROR: run this script in your private repo, not inside Homebrew.\n"
    exit 1;
fi

if [ -z "$version_dir" ]; then
    echo "Can't get version dir under $cellar_dir/"
    exit 1;
fi
cd "$cellar_dir/$version_dir"

if [ -e "production_rubylib" ]; then
    echo "brew-cask is already set up for development"
    exit 1
else
    mv rubylib production_rubylib
    mv Casks   production_Casks
    ln -s "$git_root/Casks" .
    ln -s "$git_root/lib"   rubylib
    cd "$tap_dir"
    mv lib   production_lib
    mv Casks production_Casks
    ln -s "$git_root/Casks" .
    ln -s "$git_root/lib"   .

    echo "brew-cask is now in development mode"
    echo "Note: it is not safe 'brew update' while in development mode"

fi

#