A watchr one-liner shell script, perfect for single .rb projects

wtchr

#!/usr/bin/env bash
# wtchr shell script - @squarism

# INSTALL
#   gem install watchr
#   cp wtchr ~/bin
#   chmod u+x ~/bin/wtchr

# Run with: wtchr foo.rb


##################
# Main, as it were

# the file passed in as argument 1
FILE=$1

# horrifying formatting for bash and gist
watchr -e "system('clear'); \
puts 'Watchr is watching ${FILE}.  O_o (wtchr)'; \
puts '-' * 52; \
watch('${FILE}') \
{ system('clear'); \
p=\`pwd\`.strip; \
cmd = 'ruby ' << p << '/${FILE}'; \
o = \`#{cmd}\`; \
puts o }"