Observr script for comiling a Rust project and running tests when files are saved.

observer-rust.rb

require 'open3'

def test
  puts
  puts '========================================='
  puts
  _, stdout, wait_thr = Open3.popen2('cargo test -- --nocapture --test-threads=1')
  print stdout.getc until stdout.eof?
  wait_thr.value.success?
end

def build
  puts
  puts '========================================='
  puts
  _, stdout, wait_thr = Open3.popen2('cargo build')
  print stdout.getc until stdout.eof?
  wait_thr.value.success?
end

def bench
  puts
  puts '========================================='
  puts
  _, stdout, wait_thr = Open3.popen2('cargo bench -- --nocapture')
  print stdout.getc until stdout.eof?
  wait_thr.value.success?
end

watch('^src/.*') { test && build }