Add an input stream and an error stream to TextBuiltin base class

Leverage these streams to remove calls to System.in and System.err

Bug: 413522
Change-Id: I8396f3e273c93e23861e8bcfb2ab8182fb09220d
Signed-off-by: Guillaume Nodet <gnodet@gmail.com>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/AbstractFetchCommand.java

@@ -50,7 +50,6 @@ package org.eclipse.jgit.pgm;
 import static java.lang.Character.valueOf;
 
 import java.io.IOException;
-import java.io.PrintWriter;
 import java.text.MessageFormat;
 
 import org.eclipse.jgit.lib.Constants;
@@ -60,6 +59,7 @@ import org.eclipse.jgit.lib.RefUpdate;
 import org.eclipse.jgit.pgm.internal.CLIText;
 import org.eclipse.jgit.transport.FetchResult;
 import org.eclipse.jgit.transport.TrackingRefUpdate;
+import org.eclipse.jgit.util.io.ThrowingPrintWriter;
 import org.kohsuke.args4j.Option;
 
 abstract class AbstractFetchCommand extends TextBuiltin {
@@ -92,11 +92,10 @@ abstract class AbstractFetchCommand extends TextBuiltin {
 		} finally {
 			reader.release();
 		}
-		showRemoteMessages(r.getMessages());
+		showRemoteMessages(errw, r.getMessages());
 	}
 
-	static void showRemoteMessages(String pkt) {
-		PrintWriter writer = new PrintWriter(System.err);
+	static void showRemoteMessages(ThrowingPrintWriter writer, String pkt) throws IOException {
 		while (0 < pkt.length()) {
 			final int lf = pkt.indexOf('\n');
 			final int cr = pkt.indexOf('\r');

org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/AmazonS3Client.java

@@ -116,7 +116,7 @@ class AmazonS3Client extends TextBuiltin {
 			final OutputStream os = s3.beginPut(bucket, key, null, null);
 			final byte[] tmp = new byte[2048];
 			int n;
-			while ((n = System.in.read(tmp)) > 0)
+			while ((n = ins.read(tmp)) > 0)
 				os.write(tmp, 0, n);
 			os.close();
 

org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/IndexPack.java

@@ -62,7 +62,7 @@ class IndexPack extends TextBuiltin {
 
 	@Override
 	protected void run() throws Exception {
-		BufferedInputStream in = new BufferedInputStream(System.in);
+		BufferedInputStream in = new BufferedInputStream(ins);
 		ObjectInserter inserter = db.newObjectInserter();
 		try {
 			PackParser p = inserter.newPackParser(in);

org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Push.java

@@ -161,7 +161,7 @@ class Push extends TextBuiltin {
 				printRefUpdateResult(reader, uri, result, rru);
 		}
 
-		AbstractFetchCommand.showRemoteMessages(result.getMessages());
+		AbstractFetchCommand.showRemoteMessages(errw, result.getMessages());
 		if (everythingUpToDate)
 			outw.println(CLIText.get().everythingUpToDate);
 	}

org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/ReceivePack.java

@@ -76,6 +76,6 @@ class ReceivePack extends TextBuiltin {
 		}
 
 		rp = new org.eclipse.jgit.transport.ReceivePack(db);
-		rp.receive(System.in, outs, System.err);
+		rp.receive(ins, outs, errs);
 	}
 }

org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/RevWalkTextBuiltin.java

@@ -199,10 +199,9 @@ abstract class RevWalkTextBuiltin extends TextBuiltin {
 		final int n = walkLoop();
 		if (count) {
 			final long end = System.currentTimeMillis();
-			System.err.print(n);
-			System.err.print(' ');
-			System.err
-					.println(MessageFormat.format(
+			errw.print(n);
+			errw.print(' ');
+			errw.println(MessageFormat.format(
 							CLIText.get().timeInMilliSeconds,
 							Long.valueOf(end - start)));
 		}

org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/TextBuiltin.java

@@ -50,8 +50,10 @@ import static org.eclipse.jgit.lib.Constants.R_TAGS;
 
 import java.io.BufferedWriter;
 import java.io.FileDescriptor;
+import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.io.IOException;
+import java.io.InputStream;
 import java.io.OutputStream;
 import java.io.OutputStreamWriter;
 import java.io.PrintWriter;
@@ -84,6 +86,13 @@ public abstract class TextBuiltin {
 	@Option(name = "--help", usage = "usage_displayThisHelpText", aliases = { "-h" })
 	private boolean help;
 
+	/**
+	 * Input stream, typically this is standard input.
+	 *
+	 * @since 3.4
+	 */
+	protected InputStream ins;
+
 	/**
 	 * Writer to output to, typically this is standard output.
 	 *
@@ -106,6 +115,20 @@ public abstract class TextBuiltin {
 	@Deprecated
 	protected PrintWriter out;
 
+	/**
+	 * Error writer, typically this is standard error.
+	 *
+	 * @since 3.4
+	 */
+	protected ThrowingPrintWriter errw;
+
+	/**
+	 * Error output stream, typically this is standard error.
+	 *
+	 * @since 3.4
+	 */
+	protected OutputStream errs;
+
 	/** Git repository the command was invoked within. */
 	protected Repository db;
 
@@ -137,16 +160,27 @@ public abstract class TextBuiltin {
 		try {
 			final String outputEncoding = repository != null ? repository
 					.getConfig().getString("i18n", null, "logOutputEncoding") : null; //$NON-NLS-1$ //$NON-NLS-2$
+			if (ins == null)
+				ins = new FileInputStream(FileDescriptor.in);
 			if (outs == null)
 				outs = new FileOutputStream(FileDescriptor.out);
-			BufferedWriter bufw;
+			if (errs == null)
+				errs = new FileOutputStream(FileDescriptor.err);
+			BufferedWriter outbufw;
+			if (outputEncoding != null)
+				outbufw = new BufferedWriter(new OutputStreamWriter(outs,
+						outputEncoding));
+			else
+				outbufw = new BufferedWriter(new OutputStreamWriter(outs));
+			out = new PrintWriter(outbufw);
+			outw = new ThrowingPrintWriter(outbufw);
+			BufferedWriter errbufw;
 			if (outputEncoding != null)
-				bufw = new BufferedWriter(new OutputStreamWriter(outs,
+				errbufw = new BufferedWriter(new OutputStreamWriter(errs,
 						outputEncoding));
 			else
-				bufw = new BufferedWriter(new OutputStreamWriter(outs));
-			out = new PrintWriter(bufw);
-			outw = new ThrowingPrintWriter(bufw);
+				errbufw = new BufferedWriter(new OutputStreamWriter(errs));
+			errw = new ThrowingPrintWriter(errbufw);
 		} catch (IOException e) {
 			throw die(CLIText.get().cannotCreateOutputStream);
 		}
@@ -184,14 +218,15 @@ public abstract class TextBuiltin {
 	 *
 	 * @param args
 	 *            the arguments supplied on the command line, if any.
+	 * @throws IOException
 	 */
-	protected void parseArguments(final String[] args) {
+	protected void parseArguments(final String[] args) throws IOException {
 		final CmdLineParser clp = new CmdLineParser(this);
 		try {
 			clp.parseArgument(args);
 		} catch (CmdLineException err) {
 			if (!help) {
-				System.err.println(MessageFormat.format(CLIText.get().fatalError, err.getMessage()));
+				this.errw.println(MessageFormat.format(CLIText.get().fatalError, err.getMessage()));
 				System.exit(1);
 			}
 		}
@@ -207,8 +242,9 @@ public abstract class TextBuiltin {
 	 * Print the usage line
 	 *
 	 * @param clp
+	 * @throws IOException
 	 */
-	public void printUsageAndExit(final CmdLineParser clp) {
+	public void printUsageAndExit(final CmdLineParser clp) throws IOException {
 		printUsageAndExit("", clp); //$NON-NLS-1$
 	}
 
@@ -217,20 +253,20 @@ public abstract class TextBuiltin {
 	 *
 	 * @param message
 	 * @param clp
+	 * @throws IOException
 	 */
-	public void printUsageAndExit(final String message, final CmdLineParser clp) {
-		PrintWriter writer = new PrintWriter(System.err);
-		writer.println(message);
-		writer.print("jgit "); //$NON-NLS-1$
-		writer.print(commandName);
-		clp.printSingleLineUsage(writer, getResourceBundle());
-		writer.println();
-
-		writer.println();
-		clp.printUsage(writer, getResourceBundle());
-		writer.println();
-
-		writer.flush();
+	public void printUsageAndExit(final String message, final CmdLineParser clp) throws IOException {
+		errw.println(message);
+		errw.print("jgit "); //$NON-NLS-1$
+		errw.print(commandName);
+		clp.printSingleLineUsage(errw, getResourceBundle());
+		errw.println();
+
+		errw.println();
+		clp.printUsage(errw, getResourceBundle());
+		errw.println();
+
+		errw.flush();
 		System.exit(1);
 	}
 

org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/UploadPack.java

@@ -82,6 +82,6 @@ class UploadPack extends TextBuiltin {
 		up = new org.eclipse.jgit.transport.UploadPack(db);
 		if (0 <= timeout)
 			up.setTimeout(timeout);
-		up.upload(System.in, outs, System.err);
+		up.upload(ins, outs, errs);
 	}
 }

org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/debug/RebuildCommitGraph.java

@@ -117,7 +117,7 @@ class RebuildCommitGraph extends TextBuiltin {
 	@Override
 	protected void run() throws Exception {
 		if (!really && !db.getRefDatabase().getRefs(ALL).isEmpty()) {
-			System.err.println(
+			errw.println(
 				MessageFormat.format(CLIText.get().fatalThisProgramWillDestroyTheRepository
 					, db.getDirectory().getAbsolutePath(), REALLY));
 			throw die(CLIText.get().needApprovalToDestroyCurrentRepository);
@@ -294,7 +294,7 @@ class RebuildCommitGraph extends TextBuiltin {
 					rw.parseAny(id);
 				} catch (MissingObjectException mue) {
 					if (!Constants.TYPE_COMMIT.equals(type)) {
-						System.err.println(MessageFormat.format(CLIText.get().skippingObject, type, name));
+						errw.println(MessageFormat.format(CLIText.get().skippingObject, type, name));
 						continue;
 					}
 					throw new MissingObjectException(id, type);

org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/debug/ShowCommands.java

@@ -43,14 +43,16 @@
 
 package org.eclipse.jgit.pgm.debug;
 
+import java.io.IOException;
 import java.net.URL;
 
-import org.kohsuke.args4j.Option;
 import org.eclipse.jgit.pgm.Command;
 import org.eclipse.jgit.pgm.CommandCatalog;
 import org.eclipse.jgit.pgm.CommandRef;
 import org.eclipse.jgit.pgm.TextBuiltin;
 import org.eclipse.jgit.pgm.internal.CLIText;
+import org.eclipse.jgit.util.io.ThrowingPrintWriter;
+import org.kohsuke.args4j.Option;
 
 @Command(usage = "usage_displayAListOfAllRegisteredJgitCommands")
 class ShowCommands extends TextBuiltin {
@@ -67,39 +69,39 @@ class ShowCommands extends TextBuiltin {
 		width += 2;
 
 		for (final CommandRef c : list) {
-			System.err.print(c.isCommon() ? '*' : ' ');
-			System.err.print(' ');
+			errw.print(c.isCommon() ? '*' : ' ');
+			errw.print(' ');
 
-			System.err.print(c.getName());
+			errw.print(c.getName());
 			for (int i = c.getName().length(); i < width; i++)
-				System.err.print(' ');
+				errw.print(' ');
 
-			pretty.print(c);
-			System.err.println();
+			pretty.print(errw, c);
+			errw.println();
 		}
-		System.err.println();
+		errw.println();
 	}
 
 	static enum Format {
 		/** */
 		USAGE {
-			void print(final CommandRef c) {
+			void print(ThrowingPrintWriter err, final CommandRef c) throws IOException {
 				String usage = c.getUsage();
 				if (usage != null && usage.length() > 0)
-					System.err.print(CLIText.get().resourceBundle().getString(usage));
+					err.print(CLIText.get().resourceBundle().getString(usage));
 			}
 		},
 
 		/** */
 		CLASSES {
-			void print(final CommandRef c) {
-				System.err.print(c.getImplementationClassName());
+			void print(ThrowingPrintWriter err, final CommandRef c) throws IOException {
+				err.print(c.getImplementationClassName());
 			}
 		},
 
 		/** */
 		URLS {
-			void print(final CommandRef c) {
+			void print(ThrowingPrintWriter err, final CommandRef c) throws IOException {
 				final ClassLoader ldr = c.getImplementationClassLoader();
 
 				String cn = c.getImplementationClassName();
@@ -107,7 +109,7 @@ class ShowCommands extends TextBuiltin {
 
 				final URL url = ldr.getResource(cn);
 				if (url == null) {
-					System.err.print(CLIText.get().notFound);
+					err.print(CLIText.get().notFound);
 					return;
 				}
 
@@ -115,10 +117,10 @@ class ShowCommands extends TextBuiltin {
 				if (rn.endsWith(cn))
 					rn = rn.substring(0, rn.length() - cn.length());
 
-				System.err.print(rn);
+				err.print(rn);
 			}
 		};
 
-		abstract void print(CommandRef c);
+		abstract void print(ThrowingPrintWriter err, CommandRef c) throws IOException;
 	}
 }