Add support for rendering Markdown commit messages (issue-203)

src/main/distrib/data/gitblit.properties

 # SINCE 0.8.0
 web.repositoryListSwatches = true
 
+# Defines the default commit message renderer.  This can be configured
+# per-repository.
+#
+# Valid values are: plain, markdown
+#
+# SINCE 1.4.0
+web.commitMessageRenderer = plain
+
 # Choose the diff presentation style: gitblt, gitweb, or plain
 #
 # SINCE 0.5.0

src/main/java/com/gitblit/Constants.java

 			return this == LOCAL;
 		}
 	}
+	
+	public static enum CommitMessageRenderer {
+		PLAIN, MARKDOWN;
+		
+		public static CommitMessageRenderer fromName(String name) {
+			for (CommitMessageRenderer renderer : values()) {
+				if (renderer.name().equalsIgnoreCase(name)) {
+					return renderer;
+				}
+			}
+			return CommitMessageRenderer.PLAIN;
+		}
+	}
 
 	@Documented
 	@Retention(RetentionPolicy.RUNTIME)

src/main/java/com/gitblit/GitBlit.java

 import java.nio.charset.Charset;
 import java.security.Principal;
 import java.text.MessageFormat;
+import java.text.ParseException;
 import java.text.SimpleDateFormat;
 import java.util.ArrayList;
 import java.util.Arrays;
 import com.gitblit.Constants.AccountType;
 import com.gitblit.Constants.AuthenticationType;
 import com.gitblit.Constants.AuthorizationControl;
+import com.gitblit.Constants.CommitMessageRenderer;
 import com.gitblit.Constants.FederationRequest;
 import com.gitblit.Constants.FederationStrategy;
 import com.gitblit.Constants.FederationToken;
 import com.gitblit.utils.JGitUtils;
 import com.gitblit.utils.JGitUtils.LastChange;
 import com.gitblit.utils.JsonUtils;
+import com.gitblit.utils.MarkdownUtils;
 import com.gitblit.utils.MetricUtils;
 import com.gitblit.utils.ModelUtils;
 import com.gitblit.utils.ObjectCache;
 			model.showReadme = getConfig(config, "showReadme", false);
 			model.skipSizeCalculation = getConfig(config, "skipSizeCalculation", false);
 			model.skipSummaryMetrics = getConfig(config, "skipSummaryMetrics", false);
+			model.commitMessageRenderer = CommitMessageRenderer.fromName(getConfig(config, "commitMessageRenderer",
+					settings.getString(Keys.web.commitMessageRenderer, null)));
 			model.federationStrategy = FederationStrategy.fromName(getConfig(config,
 					"federationStrategy", null));
 			model.federationSets = new ArrayList<String>(Arrays.asList(config.getStringList(
 					Constants.CONFIG_GITBLIT, null, "indexBranch")));
 			model.metricAuthorExclusions = new ArrayList<String>(Arrays.asList(config.getStringList(
 					Constants.CONFIG_GITBLIT, null, "metricAuthorExclusions")));
-			
+					
 			// Custom defined properties
 			model.customFields = new LinkedHashMap<String, String>();
 			for (String aProperty : config.getNames(Constants.CONFIG_GITBLIT, Constants.CONFIG_CUSTOM_FIELDS)) {
 			config.setInt(Constants.CONFIG_GITBLIT, null, "maxActivityCommits", repository.maxActivityCommits);
 		}
 
+		CommitMessageRenderer defaultRenderer = CommitMessageRenderer.fromName(settings.getString(Keys.web.commitMessageRenderer, null));
+		if (repository.commitMessageRenderer == null || repository.commitMessageRenderer == defaultRenderer) {
+			// use default from config
+			config.unset(Constants.CONFIG_GITBLIT, null, "commitMessageRenderer");
+		} else {
+			// repository overrides default
+			config.setString(Constants.CONFIG_GITBLIT, null, "commitMessageRenderer",
+					repository.commitMessageRenderer.name());
+		}
+		
 		updateList(config, "federationSets", repository.federationSets);
 		updateList(config, "preReceiveScript", repository.preReceiveScripts);
 		updateList(config, "postReceiveScript", repository.postReceiveScripts);
 	 * Returns an html version of the commit message with any global or
 	 * repository-specific regular expression substitution applied.
 	 * 
+	 * This method uses the preferred renderer to transform the commit message.
+	 * 
+	 * @param repository
+	 * @param text
+	 * @return html version of the commit message
+	 */
+	public String processCommitMessage(RepositoryModel repository, String text) {
+		switch (repository.commitMessageRenderer) {
+		case MARKDOWN:
+			try {
+				String prepared = processCommitMessageRegex(repository.name, text);
+				return MarkdownUtils.transformMarkdown(prepared);
+			} catch (ParseException e) {
+				logger.error("Failed to render commit message as markdown", e);
+			}
+			break;
+		default:
+			// noop
+			break;
+		}
+		
+		return processPlainCommitMessage(repository.name, text);
+	}
+	
+	/**
+	 * Returns an html version of the commit message with any global or
+	 * repository-specific regular expression substitution applied.
+	 * 
+	 * This method assumes the commit message is plain text.
+	 * 
 	 * @param repositoryName
 	 * @param text
 	 * @return html version of the commit message
 	 */
-	public String processCommitMessage(String repositoryName, String text) {
-		String html = StringUtils.breakLinesForHtml(text);
+	public String processPlainCommitMessage(String repositoryName, String text) {
+		String html = StringUtils.escapeForHtml(text, false);
+		html = processCommitMessageRegex(repositoryName, html);
+		return StringUtils.breakLinesForHtml(html);
+		
+	}
+	
+	/**
+	 * Apply globally or per-repository specified regex substitutions to the
+	 * commit message.
+	 * 
+	 * @param repositoryName
+	 * @param text
+	 * @return the processed commit message
+	 */
+	protected String processCommitMessageRegex(String repositoryName, String text) {
 		Map<String, String> map = new HashMap<String, String>();
 		// global regex keys
 		if (settings.getBoolean(Keys.regex.global, false)) {
 			String definition = entry.getValue().trim();
 			String[] chunks = definition.split("!!!");
 			if (chunks.length == 2) {
-				html = html.replaceAll(chunks[0], chunks[1]);
+				text = text.replaceAll(chunks[0], chunks[1]);
 			} else {
 				logger.warn(entry.getKey()
 						+ " improperly formatted.  Use !!! to separate match from replacement: "
 						+ definition);
 			}
 		}
-		return html;
+		return text;
 	}
 
 	/**

src/main/java/com/gitblit/SyndicationServlet.java

 						StringUtils.encodeURL(model.name.replace('/', fsc)), commit.getName());
 				entry.published = commit.getCommitterIdent().getWhen();
 				entry.contentType = "text/html";
-				String message = GitBlit.self().processCommitMessage(model.name,
+				String message = GitBlit.self().processCommitMessage(model,
 						commit.getFullMessage());
 				entry.content = message;
 				entry.repository = model.name;

src/main/java/com/gitblit/models/RepositoryModel.java

 
 import com.gitblit.Constants.AccessRestrictionType;
 import com.gitblit.Constants.AuthorizationControl;
+import com.gitblit.Constants.CommitMessageRenderer;
 import com.gitblit.Constants.FederationStrategy;
 import com.gitblit.utils.ArrayUtils;
 import com.gitblit.utils.ModelUtils;
 	public int gcPeriod;
 	public int maxActivityCommits;	
 	public List<String> metricAuthorExclusions;
+	public CommitMessageRenderer commitMessageRenderer;
 	
 	public transient boolean isCollectingGarbage;
 	public Date lastGC;

src/main/java/com/gitblit/wicket/GitBlitWebApp.properties

 gb.todaysActivityStats = today / {1} commits by {2} authors
 gb.todaysActivityNone = today / none
 gb.noActivityToday = there has been no activity today
-gb.anonymousUser= anonymous
+gb.anonymousUser= anonymous
+gb.commitMessageRenderer = commit message renderer

src/main/java/com/gitblit/wicket/pages/CommitDiffPage.html

 	<div wicket:id="commitHeader">[commit header]</div>
 
 	<!-- full message -->
-	<pre style="border-style:none" "class="commit_message" wicket:id="fullMessage">[commit message]</pre>
+	<div wicket:id="fullMessage">[commit message]</div>
 
 	<!-- commit legend -->
 	<div class="hidden-phone" style="text-align:right;" wicket:id="commitLegend"></div>

src/main/java/com/gitblit/wicket/pages/CommitDiffPage.java

 
 		add(new CommitHeaderPanel("commitHeader", repositoryName, commit));
 
-		addFullText("fullMessage", commit.getFullMessage(), true);
+		addFullText("fullMessage", commit.getFullMessage());
 
 		// changed paths list
 		List<PathChangeModel> paths = JGitUtils.getFilesInCommit(r, commit);

src/main/java/com/gitblit/wicket/pages/CommitPage.html

 	</div>
 	
 	<!-- full message -->
-	<pre class="commit_message" wicket:id="fullMessage">[commit message]</pre>
+	<div class="topborder" wicket:id="fullMessage">[commit message]</div>
 
 	<!--  git notes -->
 	<table class="gitnotes">

src/main/java/com/gitblit/wicket/pages/CommitPage.java

 		};
 		add(parentsView);
 
-		addFullText("fullMessage", c.getFullMessage(), true);
+		addFullText("fullMessage", c.getFullMessage());
 
 		// git notes
 		List<GitNote> notes = JGitUtils.getNotesOnCommit(r, c);
 				item.add(new GravatarImage("noteAuthorAvatar", entry.notesRef.getAuthorIdent()));
 				item.add(WicketUtils.createTimestampLabel("authorDate", entry.notesRef
 						.getAuthorIdent().getWhen(), getTimeZone(), getTimeUtils()));
-				item.add(new Label("noteContent", GitBlit.self().processCommitMessage(
-						repositoryName, entry.content)).setEscapeModelStrings(false));
+				item.add(new Label("noteContent", GitBlit.self().processPlainCommitMessage(repositoryName,
+						entry.content)).setEscapeModelStrings(false));
 			}
 		};
 		add(notesView.setVisible(notes.size() > 0));

src/main/java/com/gitblit/wicket/pages/EditRepositoryPage.html

 				<tr><th><wicket:message key="gb.skipSummaryMetrics"></wicket:message></th><td class="edit"><label class="checkbox"><input type="checkbox" wicket:id="skipSummaryMetrics" tabindex="12" /> &nbsp;<span class="help-inline"><wicket:message key="gb.skipSummaryMetricsDescription"></wicket:message></span></label></td></tr>
 				<tr><th><wicket:message key="gb.maxActivityCommits"></wicket:message></th><td class="edit"><select class="span2" wicket:id="maxActivityCommits" tabindex="13" /> &nbsp;<span class="help-inline"><wicket:message key="gb.maxActivityCommitsDescription"></wicket:message></span></td></tr>
 				<tr><th><wicket:message key="gb.metricAuthorExclusions"></wicket:message></th><td class="edit"><input class="span8" type="text" wicket:id="metricAuthorExclusions" size="40" tabindex="14" /></td></tr>
+				<tr><th><wicket:message key="gb.commitMessageRenderer"></wicket:message></th><td class="edit"><select class="span2" wicket:id="commitMessageRenderer" tabindex="15" /></td></tr>
 				<tr><th colspan="2"><hr/></th></tr>
-				<tr><th><wicket:message key="gb.mailingLists"></wicket:message></th><td class="edit"><input class="span8" type="text" wicket:id="mailingLists" size="40" tabindex="15" /></td></tr>
+				<tr><th><wicket:message key="gb.mailingLists"></wicket:message></th><td class="edit"><input class="span8" type="text" wicket:id="mailingLists" size="40" tabindex="16" /></td></tr>
 			</tbody>
 		</table>
 		</div>
 		<div class="tab-pane" id="permissions">
 			<table class="plain">
 				<tbody class="settings">
-					<tr><th><wicket:message key="gb.owners"></wicket:message></th><td class="edit"><span wicket:id="owners" tabindex="16" /> </td></tr>
+					<tr><th><wicket:message key="gb.owners"></wicket:message></th><td class="edit"><span wicket:id="owners" tabindex="17" /> </td></tr>
 					<tr><th colspan="2"><hr/></th></tr>
-					<tr><th><wicket:message key="gb.accessRestriction"></wicket:message></th><td class="edit"><select class="span4" wicket:id="accessRestriction" tabindex="17" /></td></tr>
+					<tr><th><wicket:message key="gb.accessRestriction"></wicket:message></th><td class="edit"><select class="span4" wicket:id="accessRestriction" tabindex="18" /></td></tr>
 					<tr><th colspan="2"><hr/></th></tr>
 					<tr><th><wicket:message key="gb.authorizationControl"></wicket:message></th><td style="padding:2px;"><span class="authorizationControl" wicket:id="authorizationControl"></span></td></tr>
 					<tr><th colspan="2"><hr/></th></tr>
-					<tr><th><wicket:message key="gb.isFrozen"></wicket:message></th><td class="edit"><label class="checkbox"><input type="checkbox" wicket:id="isFrozen" tabindex="18" /> &nbsp;<span class="help-inline"><wicket:message key="gb.isFrozenDescription"></wicket:message></span></label></td></tr>
-					<tr><th><wicket:message key="gb.allowForks"></wicket:message></th><td class="edit"><label class="checkbox"><input type="checkbox" wicket:id="allowForks" tabindex="19" /> &nbsp;<span class="help-inline"><wicket:message key="gb.allowForksDescription"></wicket:message></span></label></td></tr>
-					<tr><th><wicket:message key="gb.verifyCommitter"></wicket:message></th><td class="edit"><label class="checkbox"><input type="checkbox" wicket:id="verifyCommitter" tabindex="20" /> &nbsp;<span class="help-inline"><wicket:message key="gb.verifyCommitterDescription"></wicket:message></span><br/><span class="help-inline" style="padding-left:10px;"><wicket:message key="gb.verifyCommitterNote"></wicket:message></span></label></td></tr>
+					<tr><th><wicket:message key="gb.isFrozen"></wicket:message></th><td class="edit"><label class="checkbox"><input type="checkbox" wicket:id="isFrozen" tabindex="19" /> &nbsp;<span class="help-inline"><wicket:message key="gb.isFrozenDescription"></wicket:message></span></label></td></tr>
+					<tr><th><wicket:message key="gb.allowForks"></wicket:message></th><td class="edit"><label class="checkbox"><input type="checkbox" wicket:id="allowForks" tabindex="20" /> &nbsp;<span class="help-inline"><wicket:message key="gb.allowForksDescription"></wicket:message></span></label></td></tr>
+					<tr><th><wicket:message key="gb.verifyCommitter"></wicket:message></th><td class="edit"><label class="checkbox"><input type="checkbox" wicket:id="verifyCommitter" tabindex="21" /> &nbsp;<span class="help-inline"><wicket:message key="gb.verifyCommitterDescription"></wicket:message></span><br/><span class="help-inline" style="padding-left:10px;"><wicket:message key="gb.verifyCommitterNote"></wicket:message></span></label></td></tr>
 					<tr><th colspan="2"><hr/></th></tr>
 					<tr><th><wicket:message key="gb.userPermissions"></wicket:message></th><td style="padding:2px;"><span wicket:id="users"></span></td></tr>
 					<tr><th colspan="2"><hr/></th></tr>
 		<div class="tab-pane" id="federation">
 			<table class="plain">
 				<tbody class="settings">
-					<tr><th><wicket:message key="gb.federationStrategy"></wicket:message></th><td class="edit"><select class="span4" wicket:id="federationStrategy" tabindex="21" /></td></tr>
+					<tr><th><wicket:message key="gb.federationStrategy"></wicket:message></th><td class="edit"><select class="span4" wicket:id="federationStrategy" tabindex="22" /></td></tr>
 					<tr><th><wicket:message key="gb.federationSets"></wicket:message></th><td style="padding:2px;"><span wicket:id="federationSets"></span></td></tr>
 				</tbody>
 			</table>

src/main/java/com/gitblit/wicket/pages/EditRepositoryPage.java

 import com.gitblit.Constants;
 import com.gitblit.Constants.AccessRestrictionType;
 import com.gitblit.Constants.AuthorizationControl;
+import com.gitblit.Constants.CommitMessageRenderer;
 import com.gitblit.Constants.FederationStrategy;
 import com.gitblit.Constants.RegistrantType;
 import com.gitblit.GitBlit;
 			}
 		});
 		
+		List<CommitMessageRenderer> renderers = Arrays.asList(CommitMessageRenderer.values());
+		DropDownChoice<CommitMessageRenderer> messageRendererChoice = new DropDownChoice<CommitMessageRenderer>("commitMessageRenderer", renderers);
+		form.add(messageRendererChoice);
+		
 		form.add(new Button("save"));
 		Button cancel = new Button("cancel") {
 			private static final long serialVersionUID = 1L;
 			return Integer.toString(index);
 		}
 	}
-	
 }

src/main/java/com/gitblit/wicket/pages/RepositoryPage.java

 		add(new RefsPanel("refsPanel", repositoryName, c, JGitUtils.getAllRefs(r, getRepositoryModel().showRemoteBranches)));
 	}
 
-	protected void addFullText(String wicketId, String text, boolean substituteRegex) {
-		String html = StringUtils.escapeForHtml(text, false);
-		if (substituteRegex) {
-			html = GitBlit.self().processCommitMessage(repositoryName, html);
-		} else {
-			html = StringUtils.breakLinesForHtml(html);
+	protected void addFullText(String wicketId, String text) {
+		RepositoryModel model = getRepositoryModel();
+		String content = GitBlit.self().processCommitMessage(model, text);
+		String html;
+		switch (model.commitMessageRenderer) {
+		case MARKDOWN:
+			html = MessageFormat.format("<div class='commit_message'>{0}</div>", content);
+			break;
+		default:
+			html = MessageFormat.format("<pre class='commit_message'>{0}</pre>", content);
+			break;
 		}
 		add(new Label(wicketId, html).setEscapeModelStrings(false));
 	}

src/main/java/com/gitblit/wicket/pages/TagPage.html

 	</div>
 	
 	<!--  full message -->
-	<pre class="commit_message" wicket:id="fullMessage">[commit message]</pre>
+	<div class="topborder" wicket:id="fullMessage">[commit message]</div>
 	
 	<wicket:fragment wicket:id="fullPersonIdent">
 		<span wicket:id="personName"></span><span wicket:id="personAddress"></span>

src/main/java/com/gitblit/wicket/pages/TagPage.java

 		}
 		add(WicketUtils.createTimestampLabel("tagDate", when, getTimeZone(), getTimeUtils()));
 
-		addFullText("fullMessage", tagRef.getFullMessage(), true);
+		addFullText("fullMessage", tagRef.getFullMessage());
 	}
 
 	@Override

src/main/resources/gitblit.css

 
 .commit_message {
 	padding: 8px;
+}
+
+.topborder {
 	border: solid #ddd;
 	border-width: 1px 0px 0px;
 	border-radius: 0px;