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anonymous /localiseImages.rb
Created Aug 15, 2010

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#!/usr/bin/env ruby
# This script will download all images referenced in URL (URLs ending in
# jpg/gif/png), stick them in an images/ directory if they're not already there,
# and make a new file referencing the local directory.
#
# The script depends on the http://github.com/nahi/httpclient library.
#
# USAGE
# localiseImages.rb index.html
# ... will create images/ containing images and local.index.html pointing to them.
#
# The point is to cache images so your HTML works offline. See also spa.py
# http://mini.softwareas.com/using-fnds-excellent-spapy-to-make-a-single-p
require 'httpclient'
### UTILITIES
IMAGES_DIR = 'images'
Dir.mkdir(IMAGES_DIR) unless File.directory?(IMAGES_DIR)
def filenameize(url)
IMAGES_DIR + '/' + url.sub('http://','').gsub('/','__')
end
def save(filename,contents)
file = File.new(filename, "w")
file.write(contents)
file.close
end
### CORE
def saveImage(url)
save(filenameize(url), HTTPClient.new().get_content(url))
end
def extractImages(filename)
contents = File.open(filename, "rb").read
localContents = String.new(contents)
contents.scan(/http:\/\/\S+?\.(?:jpg|gif|png)/im) { |url|
puts url
saveImage(url) unless File.file?(filenameize(url))
localContents.gsub!(url, filenameize(url))
}
save("local."+filename, localContents)
end
### COMMAND-LINE
extractImages(ARGV[0])
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