AppDebugJob: Add PYTHONUNBUFFERED variable

Buffered stdout from python script causes that BufferedReader is
waiting infinitely. This change works around not to use buffered
IO for python.

Signed-off-by: Justin Kim <justin.kim@collabora.com>
Reviewed-by: Guillaume Desmottes <guillaume.desmottes@collabora.co.uk>
Differential Revision: https://phabricator.apertis.org/D5375

plugins/eclipse-plugin/src/org/apertis/plugin/jobs/AppDebugJob.java

@@ -13,6 +13,9 @@ import java.io.BufferedReader;
 import java.io.BufferedWriter;
 import java.io.InputStreamReader;
 import java.io.OutputStreamWriter;
+import java.util.ArrayList;
+import java.util.Enumeration;
+import java.util.List;
 import java.util.Map;
 import java.util.Properties;
 
@@ -93,13 +96,39 @@ public class AppDebugJob extends Job {
 		}
 		args[4] = "--app=" + this.exePath;
 		args[5] = this.arguments;
-
+		
+		/* FIXME: We need "Advanced Preferences" for the Apertis eclipse plugin
+		 * to set environment variables.
+		 * 
+		 * https://phabricator.apertis.org/T3299
+		 * 
+		 * python uses buffered stdout by default so it can cause infinite waiting
+		 * when BufferedReader tries to read strings. Rather than modifying 'ade'
+		 * not to use buffered stdout (python -u option), this works around to make
+		 * 'ade' print strings immediately.
+		 * 
+		 * The below iteration for all existing environment variables is required to
+		 * preserve the values.
+		 */
+		List<String> envList = new ArrayList<String>();
+		
+		Properties envProps = launcher.getEnvironment();
+		Enumeration<Object> enumProps = envProps.keys();
+		
+		while (enumProps.hasMoreElements()) {
+			Object key = enumProps.nextElement();
+			
+			envList.add(key + "=" + envProps.get(key));
+		}
+		
+		envList.add("PYTHONUNBUFFERED=1");
+		
 		try {
 			console.start(this.project);
 			
 			BufferedWriter stdout = new BufferedWriter(new OutputStreamWriter(console.getOutputStream()));
 
-			this.process = launcher.execute(new Path("ade"), args, null, location, null);
+			this.process = launcher.execute(new Path("ade"), args, envList.toArray(new String[envList.size()]), location, null);
 			
 			stdout.write(launcher.getCommandLine());
 			stdout.newLine();