Download top 50 highest voted ${tag} questions on stackoverflow, and convert them to pdf. depends on web2pdf.sh

highvote.mk

.PHONY: all

all: highvote-pdf.mk
	make -j4 -f $< WEB2PDF=/home/henix/web2pdf.sh

highvote-pdf.mk: highvote.html
	xmllint --html --xpath "//a[@class='question-hyperlink']/@href" $< 2> /dev/null | sed -e 's/ href="//g' -e 's/"/\n/g' | lua link2mk.lua > $@

highvote.html:
	curl 'http://stackoverflow.com/questions/tagged/scala?sort=votes&pagesize=50' > $@

link2mk.lua

local pdfnames = {}
local output = {}

local nu = 1
for line in io.lines() do
	local id, title = string.match(line, "/questions/([^/]*)/(.*)")
	local fname = tostring(nu)..'-'..title
	table.insert(output, fname..".pdf:")
	table.insert(output, "\t$(WEB2PDF) "..fname.." http://stackoverflow.com/questions/"..id.."/"..title)
	table.insert(output, '')
	table.insert(pdfnames, fname..".pdf")
	nu = nu + 1
end

print(".PHONY: all\n")
io.write("all: ", table.concat(pdfnames, ' '), '\n\n')
io.write(table.concat(output, '\n'))