Autocompile tex files with latexmk, simply run 'watchr latex.rb'. Works very well with Dropbox

latex.rb

watch ('./(.*).tex') { compile }

def execute(cmd)
  puts(cmd)
  `#{cmd}`
end

def compile
    run 'make all'
end

def run(command)
  system('clear')
  result = execute command
  puts result
end

@interrupted = false

# Ctrl-C
Signal.trap 'INT' do
  if @interrupted then
    @wants_to_quit = true
    abort("\n")
  else
    puts "Interrupt a second time to quit"
    @interrupted = true
    Kernel.sleep 1.5
    # raise Interrupt, nil # let the run loop catch it
    compile
  end
end

compile

Makefile

TEXFILES := $(shell find . -name "*.tex")
PDFFILES := $(patsubst %.tex,%.pdf,$(TEXFILES))

all: $(PDFFILES) clean

%.pdf: %.tex
		@latexmk -pdf $<

clean:
		@rm -f *.aux
		@rm -f *.maf
		@rm -f *.mtc
		@rm -f *.mtc0
		@rm -f *.log
		@rm -f *.fdb_latexmk
		@rm -f *.ilg
		@rm -f *.out
		@rm -f *.ind
		@rm -f *.toc
		@rm -f *.idx