dot-linker.sh

#!/usr/bin/env sh

#  Copyright Pedro Rodriguez Tavarez (c) 2017
#
#  All rights reserved.
#
#  Redistribution and use in source and binary forms, with or without
#  modification, are permitted provided that the following conditions are met:
#
#      * Redistributions of source code must retain the above copyright
#      notice, this list of conditions and the following disclaimer.
#
#      * Redistributions in binary form must reproduce the above
#      copyright notice, this list of conditions and the following
#      disclaimer in the documentation and/or other materials provided
#      with the distribution.
#
#      * Neither the name of Pedro Rodriguez Tavarez nor the names of other
#      contributors may be used to endorse or promote products derived
#      from this software without specific prior written permission.
#
#  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
#  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
#  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
#  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
#  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
#  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
#  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
#  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
#  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
#  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
#  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

envsubst < dot.mappings | while read l
do
    if [ -z "$l" ] ; then
        continue
    fi
    pair=`echo $l | awk '{split($0,a,":[ ]+"); print a[1],a[2]}'`
    src=$(echo $pair | cut -f1 -d' ')
    des=$(echo $pair | cut -f2 -d' ')
    if ! [ -e "$src" ]; then
        echo "$src doesn't exist. Skipping..."
        continue
    fi
    if [ -e "$des" ]; then
        echo "$des already exists. Skipping..."
        continue
    fi
    realP=`realpath $src`
    echo "$src -> $des"
    mkdir -p $(dirname $des) # ensure that the path exists
    ln -s $realP $des
done