userland-book/script/markpoem

#!/bin/bash

# $1 is the first parameter to our script
POEM=$1

# Complain and exit if we weren't given a path:
if [ ! $POEM ]; then
  echo 'usage: markpoem <path>'

  # Confusingly, an exit status of 0 means to the shell that everything went
  # fine, while any other number means that something went wrong.
  exit 64
fi

if [ ! -e $POEM ]; then
  echo "$POEM not found"
  exit 66
fi

echo "marking $POEM an ok poem"

POEM_BASENAME=$(basename $POEM)

# If the target is a plain file instead of a directory, make it into
# a directory and move the content into $POEM/index:
if [ -f $POEM ]; then
  echo "making $POEM into a directory, moving content to"
  echo "  $POEM/index"
  TEMPFILE="/tmp/$POEM_BASENAME.$(date +%s.%N)"
  mv $POEM $TEMPFILE
  mkdir $POEM
  mv $TEMPFILE $POEM/index
fi

if [ -d $POEM ]; then
  # touch(1) will either create the file or update its timestamp:
  touch $POEM/meta-ok-poem
else
  echo "something broke - why isn't $POEM a directory?"
  file $POEM
fi

# Signal that all is copacetic:
echo kthxbai
exit 0