A PDF Action menu item for OS X that saves to a folder hierarchy incorporating the current date

save-dated-pdf.sh

#!/bin/bash
#
# save-dated-pdf.sh
# 
# Save PDFs from the OS X PDF menu to a folder
# named according to the current date, of the
# form /path/YYYY/MM/
# 
# For example, you could use this to export receipts
# you receive via email during February 2012 to 
# ~/Documents/Receipts/2012/02/some-receipt.pdf
# 
# USAGE
# 
#   save-dated-pdf.sh title options inputfile
# 
# (But see installation below for using as a PDF
# workflow.)
# 
# INSTALLATION
# 
# Put save-dated-pdf.sh in the folder where you
# want the date-specific folders rooted. In the above
# example this would be ~/Documents/Receipts/
# 
# Create an alias to the shell script in 
# ~/Library/PDF Services, and name it accordingly
# e.g. "Save PDF to this month's receipts.sh".
# (Note: that's an alias, not a symlink. So e.g.
# drag it in the Finder while holding down CMD+ALT.
# A symlink might work too, but I haven't tried it.)
# 
# Now when you have something you want to save as a 
# PDF in that folder, just print it (File > Print from 
# the menu, or CMD+P) and choose your new entry from
# the PDF dropdown.
# 
# SEE ALSO
# 
# http://bit.ly/w0g4zc for documentation on using
# shell scripts as PDF workflow options

unique_path()
{
    # Given an absolute file path as input, 
    # generates a unique file path by appending
    # an incrementing integer to the end of the
    # filename portion. 
    # 
    # e.g. if input is /path/to/foo.txt and that
    # path already exists, will return
    # /path/to/foo-1.txt. If foo.txt and foo-1.txt
    # exist, returns /path/to/foo-2.txt, and so on.
    
    if [ -z "$1" ]; then
        echo "unique_path requires an argument"
        return 1
    fi
    
    path="$1"
    directory=$(dirname "$path")
    filename_with_ext=$(basename "$path")
    extension=${filename_with_ext##*.}
    filename=${filename_with_ext%.*}

    suffix=1

    while [ -e "$path" ]; do
       path="${directory}/${filename}-${suffix}.${extension}"
       suffix=$(( $suffix + 1 ))
    done

    echo "${path}"    
    return 0
}

pdf_title=$1
pdf_input_file=$3
current_year=$(date "+%Y")
current_month=$(date "+%m")

target_basedir=$(dirname "$0")
target_dir="${target_basedir}/${current_year}/${current_month}/"
target_path=$(unique_path "${target_dir}/${pdf_title}.pdf")
target_filename=$(basename "$target_path")

growl_notify="/usr/local/bin/growlnotify"
growl_app_name="Dated PDF Saver"

mkdir -p "$target_dir"

mv "$pdf_input_file" "$target_path" 

# If the move succeeded and we've got growlnotify installed,
# send a Growl notification
if [ $? -a -x $growl_notify ]; then
     $growl_notify \
        -n "$growl_app_name" \
        -a Preview \
        -m "File was saved to $target_dir" "Saved $target_filename"
fi