gistfile1.txt

#!/bin/bash

echo_error () {
    echo "Error: $@" 1>&2
}

if [ $(uname) == 'Darwin' ]; then
    rlink='greadlink'
else
    rlink='readlink'
fi

if [ "$1" = '-n' ]; then
    OPERATION='dry_run'
else
    OPERATION='go_for_it'
fi

set -u

# detect if current working directory is the same
# as the directory this script is in
if [ "$(dirname $($rlink -e $0))" != "$($rlink -e $(pwd))" ]; then
    echo_error 'Your current working directory must be your dotfiles repository'
    exit 1
else
    REPO="$($rlink -e $(pwd))"
fi

create_links () {
    for T in $REPO/*; do
        TARGET=$($rlink -e $T)
        LINK_NAME="$HOME/.$(basename $TARGET)"
        # test if a file, working symlink, or broken symlink already exists
        if [ -e $LINK_NAME -o -L $LINK_NAME ]; then
            CURRENT_TARGET=$($rlink -m $LINK_NAME)
            if [ $CURRENT_TARGET != $TARGET ]; then
                echo_error "$LINK_NAME already exists (and is really $CURRENT_TARGET)"
            fi
        else
            if [ $OPERATION = 'dry_run' ]; then
                echo ln -s $TARGET $LINK_NAME
            else
                ln -s $TARGET $LINK_NAME
            fi
        fi
    done
}

remove_stale_links () {
    for L in $(find $HOME -maxdepth 1 -type l -name '.*'); do
        if [ ! -e $L ]; then
            if [ $OPERATION = 'dry_run' ]; then
                echo rm $L;
            else
                rm $L
            fi
        fi
    done
}

create_links
remove_stale_links