Hi

Attached is the patch that allows you to turn off any option by prefixing the name with "no-"

For example:

mkgmap --description="hello world" 00000001.pbf --no-description 00000002.pbf

will result in the first file having the description "hello world" but
the second one will have no description at all.

..Steve

Index: resources/help/en/copyright
===================================================================
--- resources/help/en/copyright	(revision 2383)
+++ resources/help/en/copyright	(working copy)
@@ -1,5 +1,5 @@
 
-This software is Copyright 2006-2008 by the mkgmap authors
+This software is Copyright 2006-2012 by the mkgmap authors
 and contributors.
 
 This program is free software; you can redistribute it and/or modify
Index: src/uk/me/parabola/imgfmt/FileSystemParam.java
===================================================================
--- src/uk/me/parabola/imgfmt/FileSystemParam.java	(revision 2383)
+++ src/uk/me/parabola/imgfmt/FileSystemParam.java	(working copy)
@@ -40,6 +40,8 @@
 
 	public void setMapDescription(String mapDescription) {
 		this.mapDescription = mapDescription;
+		if (this.mapDescription == null)
+			this.mapDescription = "";
 	}
 
 	public int getBlockSize() {
Index: src/uk/me/parabola/mkgmap/ArgumentProcessor.java
===================================================================
--- src/uk/me/parabola/mkgmap/ArgumentProcessor.java	(revision 2383)
+++ src/uk/me/parabola/mkgmap/ArgumentProcessor.java	(working copy)
@@ -24,15 +24,25 @@
 public interface ArgumentProcessor  {
 
 	/**
-	 * Process an option.  This is intended for options that change state or
-	 * that say how the next filename is to be operated upon.
+	 * Process an option. In general you do not do anything in this callback for most options.
+	 * Options that determine how a particular file are processed are saved into a map that
+	 * is handed to the map building process.
 	 *
+	 * Options that are processed here are things like --help or --list-styles that have an
+	 * actual effect by themselves.
+	 *
 	 * @param opt The option name.
 	 * @param val The option value.
 	 */
 	public void processOption(String opt, String val);
 
 	/**
+	 * Called when an option is reset, eg --no-tdbfile.
+	 * @param opt The option name.
+	 */
+	public void removeOption(String opt);
+
+	/**
 	 * Process a filename.
 	 *
 	 * @param args A copy of the option arguments in force when this filename
Index: src/uk/me/parabola/mkgmap/CommandArgsReader.java
===================================================================
--- src/uk/me/parabola/mkgmap/CommandArgsReader.java	(revision 2383)
+++ src/uk/me/parabola/mkgmap/CommandArgsReader.java	(working copy)
@@ -293,8 +293,13 @@
 		}
 
 		public void processArg() {
-			args.setProperty(option.getOption(), option.getValue());
-			proc.processOption(option.getOption(), option.getValue());
+			if (option.isReset()) {
+				args.remove(option.getOption());
+				proc.removeOption(option.getOption());
+			} else {
+				args.setProperty(option.getOption(), option.getValue());
+				proc.processOption(option.getOption(), option.getValue());
+			}
 		}
 
 		public String getOption() {
Index: src/uk/me/parabola/mkgmap/Option.java
===================================================================
--- src/uk/me/parabola/mkgmap/Option.java	(revision 2383)
+++ src/uk/me/parabola/mkgmap/Option.java	(working copy)
@@ -1,18 +1,14 @@
 /*
- * Copyright (C) 2008 Steve Ratcliffe
- * 
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License version 2 as
- *  published by the Free Software Foundation.
- * 
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- * 
- * 
- * Author: Steve Ratcliffe
- * Create date: May 26, 2008
+ * Copyright (C) 2008, 2011.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 3 or
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
  */
 package uk.me.parabola.mkgmap;
 
@@ -23,6 +19,7 @@
 	private final String option;
 	private final String value;
 	private final boolean experimental;
+	private final boolean reset;
 
 	protected Option(String optval) {
 		String[] v = optval.split("[=:]", 2);
@@ -38,6 +35,13 @@
 			val = "";
 		}
 
+		boolean reset = false;
+		if (name.startsWith("no-")) {
+			reset = true;
+			name = name.substring(3);
+			val = null;
+		}
+
 		boolean exp = false;
 		if (name.startsWith("x-")) {
 			exp = true;
@@ -47,19 +51,11 @@
 		option = name;
 		value = val;
 		experimental = exp;
+		this.reset = reset;
 	}
 
 	protected Option(String option, String value) {
-		boolean exp = false;
-		String name = option;
-		if (name.startsWith("x-")) {
-			exp = true;
-			name = name.substring(2);
-		}
-
-		this.option = name;
-		this.value = value;
-		this.experimental = exp;
+		this(option + '=' + value);
 	}
 
 	public String getOption() {
@@ -73,4 +69,8 @@
 	public boolean isExperimental() {
 		return experimental;
 	}
+
+	public boolean isReset() {
+		return reset;
+	}
 }
Index: src/uk/me/parabola/mkgmap/main/Main.java
===================================================================
--- src/uk/me/parabola/mkgmap/main/Main.java	(revision 2383)
+++ src/uk/me/parabola/mkgmap/main/Main.java	(working copy)
@@ -263,6 +263,9 @@
 		}
 	}
 
+	public void removeOption(String opt) {
+	}
+
 	private void addTdbBuilder() {
 		TdbBuilder builder = new TdbBuilder();
 		builder.setOverviewSource(new OverviewMapDataSource());
Index: test/uk/me/parabola/mkgmap/CommandArgsTest.java
===================================================================
--- test/uk/me/parabola/mkgmap/CommandArgsTest.java	(revision 2383)
+++ test/uk/me/parabola/mkgmap/CommandArgsTest.java	(working copy)
@@ -85,7 +85,7 @@
 		String SETNAME1 = "11110000";
 		String SETNAME2 = "22220000";
 
-		carg.readArgs(new String[] {
+		carg.readArgs(new String[]{
 				"--mapname=" + SETNAME1, FILE1,
 				"--mapname=" + SETNAME2, FILE2
 		});
@@ -156,17 +156,6 @@
 		assertEquals("description", "OSM-AU New South Wales", arg.getProperty("description"));
 	}
 
-	private void createFile(String name, String content) throws IOException {
-		TestUtils.registerFile(name);
-		Writer w = null;
-		try {
-			w = new FileWriter(name);
-			w.append(content);
-		} finally {
-			Utils.closeFile(w);
-		}
-	}
-
 	/**
 	 * Combinations of all mapname possibilities.
 	 */
@@ -191,6 +180,38 @@
 	}
 
 	/**
+	 * Options can be switched off by prefixing them with 'no-'.
+	 */
+	@Test
+	public void testArgReset() {
+		carg.readArgs(new String[] {
+				"--keep-going",
+				FILE1,
+				"--no-keep-going",
+				FILE2,
+				"--keep-going",
+				FILE3,
+		});
+		
+		assertEquals("first file has keep-going", "", proc.getProperty(0, "keep-going"));
+		assertEquals("second file does not have keep-going", null, proc.getProperty(1, "keep-going"));
+		assertEquals("third file does has keep-going", "", proc.getProperty(2, "keep-going"));
+		assertEquals("any option that was not present is null", null, proc.getProperty(1,
+				"invalid-option-does-not-exist"));
+	}
+
+	private void createFile(String name, String content) throws IOException {
+		TestUtils.registerFile(name);
+		Writer w = null;
+		try {
+			w = new FileWriter(name);
+			w.append(content);
+		} finally {
+			Utils.closeFile(w);
+		}
+	}
+
+	/**
 	 * Argument processor that saves the filenames and the values of
 	 * the arguments that are in scope for each argument.
 	 */
@@ -213,8 +234,11 @@
 		public void processOption(String opt, String val) {
 		}
 
+		public void removeOption(String opt) {
+		}
+
 		public void processFilename(CommandArgs args, String filename) {
-			ArgCollector.FileArgs fa = new FileArgs();
+			FileArgs fa = new FileArgs();
 			fa.name = filename;
 
 			fa.props = new Properties();
Index: test/uk/me/parabola/mkgmap/OptionTest.java
===================================================================
--- test/uk/me/parabola/mkgmap/OptionTest.java	(revision 2383)
+++ test/uk/me/parabola/mkgmap/OptionTest.java	(working copy)
@@ -60,4 +60,17 @@
 		assertEquals("value", "world", o.getValue());
 		assertTrue("experimental", o.isExperimental());
 	}
+
+	/**
+	 * Test for an negative option eg: no-route. These begin with the prefix 'no-'.
+	 * The option name is without the prefix and a flag is set to show that the option
+	 * is being reset.
+	 */
+	@Test
+	public void testOptionReset() {
+		Option o = new Option("no-hello");
+		assertEquals("name", "hello", o.getOption());
+		assertEquals("value", null, o.getValue());
+		assertTrue("reset", o.isReset());
+	}
 }
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