Squeeze a federated wiki page by replacing a huge image with a smaller copy

gistfile1.coffee

# replace an image with a much smaller one
# work in localhost, then post with scp
# scp pages/degrees-of-publicness fed.wiki.org:wiki/farm-8080/data/farm/mehaffy.fed.wiki.org/pages/

fs = require 'fs'
destFileName = '../pages/degrees-of-publicness'

# find source image
source = JSON.parse fs.readFileSync '../pages/scratch', 'utf-8'
images = (item for item in source.story when item.type is 'image')
throw "trouble: expect one source image" unless images.length is 1
image = images[0]

# find dest image
dest = JSON.parse fs.readFileSync destFileName, 'utf-8'
destImages = (item for item in dest.story when item.type is 'image')
throw "trouble: expect one dest image" unless images.length is 1
destImage = destImages[0]

# revise the story
destImage.url = image.url

# revise the journal
for action in dest.journal
  continue unless action.id is destImage.id and action.type in ['add', 'edit']
  console.log action.type
  action.item.url = image.url

# write revised dest
data = JSON.stringify dest, null, 2
fs.writeFileSync destFileName, data, 'utf-8'
console.log 'done'