ci.sh

# recursively replace all occurrences of something.
find dir -type f -name '*.hs' -print0 | \\
  xargs -0 sed -i 's/Find/Replace/g'

# recursively remove all trailing whitespace
find dir -type f -print0 | \\
  xargs -0 sed -i 's/[ \t]*S//'

# recursively add newlines to the end of files that don't have them.
find dir -type f -print0 | xargs -0 sed -i -e '$a\'

# recursively change a 'oldString' which are in uncommented lines with
# 'newString', but respect comments at the end of a line.
# (Haskell style comments here, not hard to change)
find dir -type f -name '*.hs' -print0 | \\
  xargs -0 sed -i 's/^\([^--]*\)newString/\1oldString/'