Add additional FastForwardMode enums for different config contexts

FastForwardMode should be represented by different enums depending on
context it is set or get from. E.g. FastForwardMode.FF_ONLY for
branch.<name>.mergeoptions is "--ff-only" but for merge.ff it is "only".

Change-Id: I3ecc16d48e715b81320b73ffae4caf3558f965f2

org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/ConfigTest.java

@@ -63,6 +63,7 @@ import java.util.Iterator;
 import java.util.LinkedList;
 import java.util.Set;
 
+import org.eclipse.jgit.api.MergeCommand.FastForwardMode;
 import org.eclipse.jgit.errors.ConfigInvalidException;
 import org.eclipse.jgit.junit.MockSystemReader;
 import org.eclipse.jgit.util.FS;
@@ -287,7 +288,7 @@ public class ConfigTest {
 		assertSame(CoreConfig.AutoCRLF.FALSE, c.getEnum("s", null, "d",
 				CoreConfig.AutoCRLF.FALSE));
 
-		c = parse("[s \"b\"]\n\tc = one two\n");
+		c = parse("[s \"b\"]\n\tc = one-two\n");
 		assertSame(TestEnum.ONE_TWO, c.getEnum("s", "b", "c", TestEnum.ONE_TWO));
 	}
 
@@ -295,7 +296,81 @@ public class ConfigTest {
 	public void testSetEnum() {
 		final Config c = new Config();
 		c.setEnum("s", "b", "c", TestEnum.ONE_TWO);
-		assertEquals("[s \"b\"]\n\tc = one two\n", c.toText());
+		assertEquals("[s \"b\"]\n\tc = one-two\n", c.toText());
+	}
+
+	@Test
+	public void testGetFastForwardMergeoptions() throws ConfigInvalidException {
+		Config c = new Config(null); // not set
+		assertSame(FastForwardMode.MergeOptions.__FF, c.getEnum(
+				ConfigConstants.CONFIG_BRANCH_SECTION, "side",
+				ConfigConstants.CONFIG_KEY_MERGEOPTIONS,
+				FastForwardMode.MergeOptions.__FF));
+		c = parse("[branch \"side\"]\n\tmergeoptions = --ff-only\n");
+		assertSame(FastForwardMode.MergeOptions.__FF_ONLY, c.getEnum(
+				ConfigConstants.CONFIG_BRANCH_SECTION, "side",
+				ConfigConstants.CONFIG_KEY_MERGEOPTIONS,
+				FastForwardMode.MergeOptions.__FF_ONLY));
+		c = parse("[branch \"side\"]\n\tmergeoptions = --ff\n");
+		assertSame(FastForwardMode.MergeOptions.__FF, c.getEnum(
+				ConfigConstants.CONFIG_BRANCH_SECTION, "side",
+				ConfigConstants.CONFIG_KEY_MERGEOPTIONS,
+				FastForwardMode.MergeOptions.__FF));
+		c = parse("[branch \"side\"]\n\tmergeoptions = --no-ff\n");
+		assertSame(FastForwardMode.MergeOptions.__NO_FF, c.getEnum(
+				ConfigConstants.CONFIG_BRANCH_SECTION, "side",
+				ConfigConstants.CONFIG_KEY_MERGEOPTIONS,
+				FastForwardMode.MergeOptions.__NO_FF));
+	}
+
+	@Test
+	public void testSetFastForwardMergeoptions() {
+		final Config c = new Config();
+		c.setEnum("branch", "side", "mergeoptions",
+				FastForwardMode.MergeOptions.valueOf(FastForwardMode.FF));
+		assertEquals("[branch \"side\"]\n\tmergeoptions = --ff\n", c.toText());
+		c.setEnum("branch", "side", "mergeoptions",
+				FastForwardMode.MergeOptions.valueOf(FastForwardMode.FF_ONLY));
+		assertEquals("[branch \"side\"]\n\tmergeoptions = --ff-only\n",
+				c.toText());
+		c.setEnum("branch", "side", "mergeoptions",
+				FastForwardMode.MergeOptions.valueOf(FastForwardMode.NO_FF));
+		assertEquals("[branch \"side\"]\n\tmergeoptions = --no-ff\n",
+				c.toText());
+	}
+
+	@Test
+	public void testGetFastForwardMerge() throws ConfigInvalidException {
+		Config c = new Config(null); // not set
+		assertSame(FastForwardMode.Merge.TRUE, c.getEnum(
+				ConfigConstants.CONFIG_KEY_MERGE, null,
+				ConfigConstants.CONFIG_KEY_FF, FastForwardMode.Merge.TRUE));
+		c = parse("[merge]\n\tff = only\n");
+		assertSame(FastForwardMode.Merge.ONLY, c.getEnum(
+				ConfigConstants.CONFIG_KEY_MERGE, null,
+				ConfigConstants.CONFIG_KEY_FF, FastForwardMode.Merge.ONLY));
+		c = parse("[merge]\n\tff = true\n");
+		assertSame(FastForwardMode.Merge.TRUE, c.getEnum(
+				ConfigConstants.CONFIG_KEY_MERGE, null,
+				ConfigConstants.CONFIG_KEY_FF, FastForwardMode.Merge.TRUE));
+		c = parse("[merge]\n\tff = false\n");
+		assertSame(FastForwardMode.Merge.FALSE, c.getEnum(
+				ConfigConstants.CONFIG_KEY_MERGE, null,
+				ConfigConstants.CONFIG_KEY_FF, FastForwardMode.Merge.FALSE));
+	}
+
+	@Test
+	public void testSetFastForwardMerge() {
+		final Config c = new Config();
+		c.setEnum("merge", null, "ff", FastForwardMode.Merge.valueOf(FastForwardMode.FF));
+		assertEquals("[merge]\n\tff = true\n", c.toText());
+		c.setEnum("merge", null, "ff",
+				FastForwardMode.Merge.valueOf(FastForwardMode.FF_ONLY));
+		assertEquals("[merge]\n\tff = only\n",
+				c.toText());
+		c.setEnum("merge", null, "ff",
+				FastForwardMode.Merge.valueOf(FastForwardMode.NO_FF));
+		assertEquals("[merge]\n\tff = false\n", c.toText());
 	}
 
 	@Test

org.eclipse.jgit/src/org/eclipse/jgit/api/MergeCommand.java

@@ -121,6 +121,122 @@ public class MergeCommand extends GitCommand<MergeResult> {
 		 * forward).
 		 */
 		FF_ONLY;
+
+		/**
+		 * The modes available for fast forward merges corresponding to the
+		 * options under branch.<name>.branch config option.
+		 */
+		public enum MergeOptions {
+			/**
+			 * {@link FastForwardMode#FF}.
+			 */
+			__FF,
+			/**
+			 * {@link FastForwardMode#NO_FF}.
+			 */
+			__NO_FF,
+			/**
+			 * {@link FastForwardMode#FF_ONLY}.
+			 */
+			__FF_ONLY;
+
+			/**
+			 * Map from <code>FastForwardMode</code> to
+			 * <code>FastForwardMode.MergeOptions</code>.
+			 *
+			 * @param ffMode
+			 *            the <code>FastForwardMode</code> value to be mapped
+			 * @return the mapped code>FastForwardMode.MergeOptions</code> value
+			 */
+			public static MergeOptions valueOf(FastForwardMode ffMode) {
+				switch (ffMode) {
+				case NO_FF:
+					return __NO_FF;
+				case FF_ONLY:
+					return __FF_ONLY;
+				default:
+					return __FF;
+				}
+			}
+		}
+
+		/**
+		 * The modes available for fast forward merges corresponding to the
+		 * options under merge.ff config option.
+		 */
+		public enum Merge {
+			/**
+			 * {@link FastForwardMode#FF}.
+			 */
+			TRUE,
+			/**
+			 * {@link FastForwardMode#NO_FF}.
+			 */
+			FALSE,
+			/**
+			 * {@link FastForwardMode#FF_ONLY}.
+			 */
+			ONLY;
+
+			/**
+			 * Map from <code>FastForwardMode</code> to
+			 * <code>FastForwardMode.Merge</code>.
+			 *
+			 * @param ffMode
+			 *            the <code>FastForwardMode</code> value to be mapped
+			 * @return the mapped code>FastForwardMode.Merge</code> value
+			 */
+			public static Merge valueOf(FastForwardMode ffMode) {
+				switch (ffMode) {
+				case NO_FF:
+					return FALSE;
+				case FF_ONLY:
+					return ONLY;
+				default:
+					return TRUE;
+				}
+			}
+		}
+
+		/**
+		 * Map from <code>FastForwardMode.Merge</code> to
+		 * <code>FastForwardMode</code>.
+		 *
+		 * @param ffMode
+		 *            the <code>FastForwardMode.Merge</code> value to be mapped
+		 * @return the mapped code>FastForwardMode</code> value
+		 */
+		public static FastForwardMode valueOf(FastForwardMode.Merge ffMode) {
+			switch (ffMode) {
+			case FALSE:
+				return NO_FF;
+			case ONLY:
+				return FF_ONLY;
+			default:
+				return FF;
+			}
+		}
+
+		/**
+		 * Map from <code>FastForwardMode.MergeOptions</code> to
+		 * <code>FastForwardMode</code>.
+		 *
+		 * @param ffMode
+		 *            the <code>FastForwardMode.MergeOptions</code> value to be
+		 *            mapped
+		 * @return the mapped code>FastForwardMode</code> value
+		 */
+		public static FastForwardMode valueOf(
+				FastForwardMode.MergeOptions ffMode) {
+			switch (ffMode) {
+			case __NO_FF:
+				return NO_FF;
+			case __FF_ONLY:
+				return FF_ONLY;
+			default:
+				return FF;
+			}
+		}
 	}
 
 	/**

org.eclipse.jgit/src/org/eclipse/jgit/lib/Config.java

@@ -387,7 +387,7 @@ public class Config {
 		if (value == null)
 			return defaultValue;
 
-		String n = value.replace(' ', '_');
+		String n = value.replace('-', '_');
 		T trueState = null;
 		T falseState = null;
 		for (T e : all) {
@@ -720,7 +720,7 @@ public class Config {
 	 */
 	public <T extends Enum<?>> void setEnum(final String section,
 			final String subsection, final String name, final T value) {
-		String n = value.name().toLowerCase().replace('_', ' ');
+		String n = value.name().toLowerCase().replace('_', '-');
 		setString(section, subsection, name, n);
 	}
 

org.eclipse.jgit/src/org/eclipse/jgit/lib/ConfigConstants.java

@@ -191,4 +191,7 @@ public class ConfigConstants {
 
 	/** The "mergeoptions" key */
 	public static final String CONFIG_KEY_MERGEOPTIONS = "mergeoptions";
+
+	/** The "ff" key */
+	public static final String CONFIG_KEY_FF = "ff";
 }