An Android automake script
For Android NDK development, it was getting a little irritating bouncing back and forth from Eclipse to Textmate then to a terminal to build an NDK shared library.
There are probably other alternatives, but I was wishing there was something like autotest available for Ruby and Rails projects. Even though it isn’t really enforcing TDD by running any tests, it saves tons of keystrokes while you’re tweaking your NDK project.
I call this little ruby script robomake. It should be run from the ndk directory. It watches the source files and when a change is detected, it runs the make which will build and install the given NDK project.
If you ‘chmod +x’, remove the .rb extension and place it in your executable path, it can run like this.
robomake hello-jni
where hello-jni is the name of an NDK project under the apps folder. The script will run ‘make APP=hello-jni’ each time a dependent file is changed. Run it from the root NDK folder where you would normally do your make.
#! /usr/bin/ruby# A script to watch files and build Android NDK projects
interrupted = falsetrap("INT") { interrupted = true }
def print_separator puts "============================================="end
extensions = ["mk", "cpp", "h"]
if ARGV.size < 1 puts "Usage: robomake.rb <app>" exit 1end
app = ARGV.shiftapp_folder = "apps/#{app}"application_mk = "#{app_folder}/Application.mk"command = "make APP=#{app}"
unless File.exists?(application_mk) puts "#{application_mk} does not exist" exit 1end
jni_path = ""File.open(application_mk) do |file| while (line = file.gets) split = line.split(':=') if "#{split[0].rstrip}" == "APP_PROJECT_PATH" jni_path = split[1].strip << "/jni/**" break end end file.closeend
files = {}extensions.each { |ext| Dir[jni_path + "/*.#{ext}"].each { |file| files[file] = File.mtime(file) }}
system(command)print_separatorloop do sleep 1 if interrupted exit end
changed_file, last_changed = files.find { |file, last_changed| File.mtime(file) > last_changed }
if changed_file files[changed_file] = File.mtime(changed_file) puts "=> #{changed_file} changed, running #{command}" system(command) print_separator endend