brew_migrate

#!/usr/bin/env bash

function join_by { local IFS="$1"; shift; echo "$*"; }

if  [ $# -ne 1 ]; then
    echo "Please pass inventory file as argument"
    exit -1
fi

filename=$1
declare -a brews
declare -a casks
declare -a taps

while read -r line
do
    case $line in
    "## Casks")
        targets="casks";;
    "## Brews")
        targets="brews";;
    "## Installed taps")
        targets="taps";;
    "");;
    *)
        name=$(echo "$line" | awk '/- \[x\].+/ { gsub(/- \[x\] /,"");split($0, l, ":");print l[1] }')

        case $targets in
        "casks")
            casks+=($name)
            ;;
        "brews")
            brews+=($name)
            ;;
        "taps")
            case $name in
            "homebrew/binary" | "homebrew/devel-only" | "homebrew/games" | "homebrew/science"  | "homebrew/versions"  | "homebrew/x11")
                echo "Ignoring deprecated tap $name";;
            *)
                taps+=($name);;
            esac
            ;;
        esac
    ;;
    esac
done < "$filename"

cat << EOF
#!/usr/bin/env bash

# Brew installation restore
# Generated at $(date)
#

which -s brew
if [ \$? -ne 0 ]; then
    echo "Installing brew..."
    (/usr/bin/ruby -e "\$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)")
fi

# Retapping taps
#
echo "Tapping taps"
for t in ${taps[@]}; do
    brew tap \${t}
done

# Installing brews
#
echo "Installing brews"
for b in ${brews[@]}; do
    brew install \${b}
done

#
# Installing casks
echo "Installing casks"
for c in ${casks[@]}; do
    brew install --cask \${c}
done

echo "Done"
EOF