small script to download webcomics

robo.lua

local start_url = 'http://www.atomic-robo.com/atomicrobo/v1ch1-cover'
local next_page_pattern = '<a href="([^"]+)" class="next" rel="next"></a>'
local last_page_pattern = '<a href="([^"]+)" class="last" rel="index"></a>'
local image_pattern = '<img title="([^"]+)" src="([^"]+)" id="cc-c'

local http = require('socket.http')

local page_url = start_url
local count = 0

while not exit do
    local page, code = http.request(page_url)
    if code ~= 200 then
        print('downloading page failed with code ' .. code)
        exit = true
    end
    
    page_url = string.match(page, next_page_pattern)
    title, image_url = string.match(page, image_pattern)
    
    --print(string.format('curl -s %s > "%04d - %s.jpg"', image_url, count, title))
    os.execute(string.format('curl -s %s > "%04d - %s.jpg"', image_url, count, title))
    count = count + 1
    print('Downloaded ' .. image_url)
end