tweak

#!/bin/sh

# tweak - Automated tweaks management
#
# A part of confman (https://github.com/ianayl/confman)

TWEAKDIR="$HOME/etc/tweaks"

usage () {
    >&2 echo "Usage: tweak [options] [tweak]
\t-i\tinstalls selected tweak
\t-r\tremoves selected tweak
\t-q\tlists all tweaks
\t-p\tlists installed tweaks
\t-a\tassisted prompt to help install tweaks one by one
\t-h\tbrings up this help message"
    exit
}

install () {
    if [ "$(grep $1 $TWEAKDIR/.installed)" ]
    then
        echo "Selected tweak $1 already installed! Are you sure you want to install again?"
        printf "(NOTE: tweak does not automatically uninstall for you) [y/n] "
        read confirmation_selection
        case $confirmation_selection in
            y|Y) ;;
            *) exit 1 ;;
        esac
    fi
    if [ ! -e "$TWEAKDIR/$1/install.sh" ]
    then
        echo "Tweak: Selected tweak $1 does not exist."
        exit 1
    fi
    TWEAKDIR=$TWEAKDIR $TWEAKDIR/$1/install.sh $1
    echo $1 >> $TWEAKDIR/.installed
}

remove () {
    if [ ! -e "$TWEAKDIR/$1/remove.sh" ]
    then
        if [ ! -e "$TWEAKDIR/$1/install.sh" ]
        then
            echo "Tweak: Selected tweak $1 does not exist."
        else
            echo "Tweak: Selected tweak $1 does not have an uninstall method."
        fi
        exit 1
    fi 
    # make sure .installed is there so grep doesn't error
    touch .installed
    if [ -z "$(grep $1 $TWEAKDIR/.installed)" ]
    then
        echo "Selected tweak $1 not installed! Are you sure you want to proceed anyway?"
        printf "(NOTE: COULD BE DANGEROUS!) [y/n] "
        read confirmation_selection
        case $confirmation_selection in
            y|Y) ;;
            *) exit 1 ;;
        esac
    fi
    TWEAKDIR=$TWEAKDIR $TWEAKDIR/$1/remove.sh $1
    sed -i "/^$1\$/d" $TWEAKDIR/.installed
}

query () {
    current_dir=$PWD
    cd $TWEAKDIR
    ls
    cd $current_dir
}

installed () {
    cat $TWEAKDIR/.installed
}

automatic () {
    for tweak in $TWEAKDIR/*/; do
        [ -d "$tweak" ] || continue
        tweak=$(basename $tweak)
        [ "$(grep $tweak $TWEAKDIR/.installed)" ] && continue
        printf "Install tweak $tweak? [y/n] "
        read confirmation_selection
        case $confirmation_selection in
            y|Y) ;;
            *) echo "Skipped tweak $tweak" && continue ;;
        esac
        install "$tweak"
    done
}

[ "$1" ] || usage
case $1 in
    -i) install $2 ;;
    -r) remove $2 ;;
    -q) query ;;
    -p) installed ;;
    -a) automatic ;;
    *) usage ;;
esac
sac