Bash script to symlink a shard into lib to make development easier

link_local_shard

#!/bin/bash

#
# Usage: link_local_shard ../myshard
# 
# Run from target project root. Deletes existing dir in lib (presumably
# added by shards) and replaces with a symlink to the path you provide.
#

if [ ! -d ./lib ]; then
  echo "Must run from project root dir."
  exit 1
fi

shard_dir=${1%/} # remove trailing slash
shard_name=${shard_dir##*/}

if [[ $shard_dir != ./* ]] && [[ $shard_dir != ../* ]]; then
  echo "Path to shard must start with ./ or ../"
  exit 1
fi

if [ ! -d $shard_dir ]; then
  echo "Specified shard dir does not exist."
  exit 1
fi

if [[ $shard_name == '' ]]; then
  echo "Shard name was blank."
  exit 1
fi

echo
echo 'About to run the following commands:'
echo
echo "  rm -rf './lib/${shard_name}'"
echo "  ln -s '../${shard_dir}' './lib/${shard_name}'"
echo
echo -n 'If everything looks good, hit ENTER to continue (or Ctrl-C to abort)... '
read

rm -rf -- "./lib/${shard_name}" &&
  ln -v -s -- "../${shard_dir}" "./lib/${shard_name}"