#!/bin/bash
# From Matt Brophy 2/16/2012 --Fred

# Download scripts available from the http://www.bristle.com/Tips/ website.
#
# Assumptions: 
# - Specified script URL's are simply Apache directory listings.
#   As of 2/16/12, they are generated by: 
#     Apache/2.2.9 (Fedora) Server at bristle.com Port 80
# - wget is installed and available on the given machine
#

if [ $# -lt 1 ] || [ $# -gt 2 ]; then
  echo "Usage: ${0} <url> [dir]"
  echo
  echo "  url   Bristle.com URL to download scripts from.  For example:    "
  echo "          http://www.bristle.com/Tips/Mac/Unix/                    "
  echo
  echo "  dir   Where to save the downloaded scripts.  Defaults to the     "
  echo "          current working directory.  Note that all files in [dir] " 
  echo "          will be chmod 755'd following the download               "
  echo
  exit
fi

URL="${1}"

DIR="."
if [ $# -eq 2 ]; then 
  DIR="${2}";
  if [ ! -e "${DIR}" ]; then
    echo "The directory ${DIR} does not exist, create it? [y/N]"
    read ANS
    if [ "${ANS}" == "y" ] || [ "$ANS" == "Y" ]; then
      mkdir "${DIR}";
      if [ ! -e "${DIR}" ]; then
        echo "Unable to create directory ${DIR}.  Exiting."
        exit
      fi  
    else
      echo "Directory not created.  Exiting."
      exit
    fi
  fi

  if [ ! -d "${DIR}" ]; then
    echo "${DIR} is not a directory.  Exiting."
    exit;
  fi

  if [ ! -w "${DIR}" ]; then
    echo "No write permissions to dir ${DIR}.  Exiting."
    exit
  fi
fi

# wget options:
#   -r           Recursively retrieve files from the specified url 
#                  (i.e., those linked to by the page)
#   -np          Do not traverse to parent directories
#   -l 1         Limit recursive traversal to only the specified directory
#   -N           Turn on timestamping, which will allow newer versions of remote files 
#                  to overwrite older, local versions
#   -nH          Do not create a local host directory (i.e., www.bristle.com/)
#   -nd          Do not create a hierarchy of directories, simply save all 
#                  files to the working dir
#   -R "*.*,*/"  Reject files with extensions and links to subdirectories 
#   -w 0.5       Wait half a second in between each download
pushd "${DIR}" > /dev/null
wget -r -np -l 1 -N -nH -nd -R "*.*,*/" -w 0.5 "${URL}"
chmod 755 ./*
popd > /dev/null