Gradle Exec task and process output

问题:

I have a python script which prints some strings and updates it's execution progress in console:

if __name__ == '__main__':     ...      print 'Hello, world!'      while page <= pages:         ...          done = float(page) / pages         sys.stdout.write('\r[{0:50s}] {1:.2f}%'.format('#' * int(done * 50), done * 100))          page += 1      print '' 

When I run it from console like python script.py everything is ok and I can see output and progressbar. I need to run this script as a part of Gradle build, so, I've created a task:

task process(type: Exec) {     workingDir file('src/main/python')     commandLine 'python', 'process.py', ... } 

Now, when I use gradle process to execute the script I see no output in console, the last line that is printed is > Building 0% > :process

I've tried to use Java 7's ProcessBuilder with no luck too:

task process << {     def processBuilder = new ProcessBuilder([             'python',             'process.py',             ...     ]).directory(file('src/main/python'))             .redirectInput(ProcessBuilder.Redirect.INHERIT)             .redirectOutput(ProcessBuilder.Redirect.INHERIT)             .redirectError(ProcessBuilder.Redirect.INHERIT).start().waitFor() } 

I'm stuck. I really want to see python's output in the same console. How can I achieve it?

UPD: sometimes it somehow prints gibberish:

回答1:

I worked around this issue by flushing the system output in the python script. it's not the ideal solution, but it gets the job done.

So I have the following in my python script

import sys import time  def flush_out(string):     print(string)     sys.stdout.flush()  #script does something flush_out("Waiting for 10 seconds...") time.sleep(10) flush_out("Exiting") sys.exit(0) 

回答2:

The only solution for me was to redirect output to the file:

  .redirectErrorStream(true)   .redirectOutput(ProcessBuilder.Redirect.to(new File(project.buildDir, "my-task.log"))) 

文章来源: Gradle Exec task and process output