/projects/netbeans-7.3/dlight.remote.impl/src/org/netbeans/modules/remote/impl/FindBasedExecutablesCompletionProviderFactory.java

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package org.netbeans.modules.remote.impl;

import org.netbeans.modules.remote.api.ui.AutocompletionProvider;
import org.netbeans.modules.remote.spi.AutocompletionProviderFactory;
import org.netbeans.modules.remote.util.ExecSupport;
import org.netbeans.modules.remote.util.ExecSupport.Status;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.TreeSet;
import java.util.concurrent.Callable;
import java.util.concurrent.FutureTask;
import org.netbeans.modules.nativeexecution.api.ExecutionEnvironment;
import org.netbeans.modules.nativeexecution.api.NativeProcessBuilder;
import org.netbeans.modules.nativeexecution.api.util.ConnectionManager;
import org.openide.util.Exceptions;
import org.openide.util.RequestProcessor;

/**
 *
 * @author ak119685
 */

//@ServiceProvider(service = AutocompletionProviderFactory.class)
// This provider is not, actualy, very useful, as it doesn't give the full path
// to the executable at the end... Plus in dialogs it is not a common practice
// to have completion for executables, taken from PATH...
//
//@ServiceProvider(service = AutocompletionProviderFactory.class)

public class FindBasedExecutablesCompletionProviderFactory implements AutocompletionProviderFactory {

    public AutocompletionProvider newInstance(ExecutionEnvironment env) {
        try {
            return new Provider(env);
        } catch (IOException ex) {
            Exceptions.printStackTrace(ex);
        }

        return null;
    }

    public boolean supports(ExecutionEnvironment env) {
        return ConnectionManager.getInstance().isConnectedTo(env);
    }

    private final static class Provider implements AutocompletionProvider {

        private String[] executables = null;
        private final FutureTask<String[]> fetchTask;

        private Provider(ExecutionEnvironment env) throws IOException {
            fetchTask = new FutureTask<String[]>(new Find(env));
            RequestProcessor.getDefault().post(fetchTask);
        }

        public List<String> autocomplete(String str) {
            if ("".equals(str)) { // NOI18N
                return Collections.<String>emptyList();
            }

            if (executables == null) {
                try {
                    executables = fetchTask.get();
                } catch (Exception ex) {
                    Exceptions.printStackTrace(ex);
                }
            }

            List<String> result = new ArrayList<String>();

            boolean found = false;

            for (String exec : executables) {
                if (exec.startsWith(str)) {
                    result.add(exec);
                    found = true;
                } else if (found) {
                    break;
                }
            }

            return result;
        }

        private final class Find implements Callable<String[]> {

            private final ExecutionEnvironment env;

            private Find(ExecutionEnvironment env) {
                this.env = env;
            }

            public String[] call() throws Exception {
                TreeSet<String> result = new TreeSet<String>();

                try {
                    NativeProcessBuilder npb = NativeProcessBuilder.newProcessBuilder(env);
                    npb.setExecutable("/bin/sh").setArguments("-c", "find `echo $PATH|tr : ' '` -type f -perm -+x 2>/dev/null"); // NOI18N
                    Status rc = ExecSupport.call(npb);
                    for (String s : rc.output) {
                        int idx = s.lastIndexOf('/') + 1;
                        if (idx > 0) {
                            result.add(s.substring(idx));
                        }
                    }
                } catch (Exception ex) {
                }

                return result.toArray(new String[0]);
            }
        }
    }
}