Adds condition based on build description

src/main/java/pl/damianszczepanik/jenkins/buildhistorymanager/descriptors/conditions/BuildDescriptionDescriptor.java

@@ -0,0 +1,39 @@
+package pl.damianszczepanik.jenkins.buildhistorymanager.descriptors.conditions;
+
+import hudson.Extension;
+import hudson.model.Descriptor;
+import hudson.util.ListBoxModel;
+import org.jenkinsci.Symbol;
+import pl.damianszczepanik.jenkins.buildhistorymanager.Messages;
+import pl.damianszczepanik.jenkins.buildhistorymanager.model.conditions.BuildDescriptionCondition;
+import pl.damianszczepanik.jenkins.buildhistorymanager.model.conditions.BuildDescriptionCondition.MatchingMethodType;
+import pl.damianszczepanik.jenkins.buildhistorymanager.model.conditions.Condition;
+
+/**
+ * Descriptor implementation needed to render UI for {@link BuildDescriptionCondition}.
+ *
+ * @author Damian Szczepanik (damianszczepanik@github)
+ */
+@Extension
+@Symbol("BuildDescription")
+public class BuildDescriptionDescriptor extends Descriptor<Condition> {
+
+    public BuildDescriptionDescriptor() {
+        super(BuildDescriptionCondition.class);
+    }
+
+    // names must refer to the field name
+    public ListBoxModel doFillMatchingMethodItems() {
+        return new ListBoxModel(
+                // default option should be listed first
+                new ListBoxModel.Option(Messages.matchingMethodType_EQUALS(), MatchingMethodType.EQUALS.name()),
+                new ListBoxModel.Option(Messages.matchingMethodType_CONTAINS(), MatchingMethodType.CONTAINS.name()),
+                new ListBoxModel.Option(Messages.matchingMethodType_MATCHES(), MatchingMethodType.MATCHES.name())
+        );
+    }
+
+    @Override
+    public String getDisplayName() {
+        return "Build description";
+    }
+}

src/main/java/pl/damianszczepanik/jenkins/buildhistorymanager/model/conditions/BuildDescriptionCondition.java

@@ -0,0 +1,67 @@
+package pl.damianszczepanik.jenkins.buildhistorymanager.model.conditions;
+
+import hudson.Util;
+import hudson.model.Run;
+import org.kohsuke.stapler.DataBoundConstructor;
+import org.kohsuke.stapler.DataBoundSetter;
+import pl.damianszczepanik.jenkins.buildhistorymanager.model.RuleConfiguration;
+
+/**
+ * Matches builds that description is equal, contains or matches given pattern.
+ *
+ * @author Damian Szczepanik (damianszczepanik@github)
+ */
+public class BuildDescriptionCondition extends Condition {
+
+    /**
+     * Matches method for the pattern
+     */
+    public enum MatchingMethodType {
+        EQUALS,
+        CONTAINS,
+        MATCHES;
+    }
+
+    private String pattern;
+
+    private MatchingMethodType matchingMethod = MatchingMethodType.EQUALS;
+
+    @DataBoundConstructor
+    public BuildDescriptionCondition() {
+        // Jenkins stapler requires to have public constructor with @DataBoundConstructor
+    }
+
+    public String getPattern() {
+        return pattern;
+    }
+
+    @DataBoundSetter
+    public void setPattern(String pattern) {
+        this.pattern = Util.fixNull(pattern);
+    }
+
+    public String getMatchingMethod() {
+        return matchingMethod.name();
+    }
+
+    @DataBoundSetter
+    public void setMatchingMethod(String matchingMethod) {
+        this.matchingMethod = MatchingMethodType.valueOf(matchingMethod);
+    }
+
+    @Override
+    public boolean matches(Run<?, ?> run, RuleConfiguration configuration) {
+        // by default build description is null
+        String buildDescription = Util.fixNull(run.getDescription());
+
+        switch (matchingMethod) {
+            case CONTAINS:
+                return buildDescription.contains(pattern);
+            case MATCHES:
+                return buildDescription.matches(pattern);
+            case EQUALS:
+            default: // any unspecified value should be fallback to default one -> equals
+                return buildDescription.equals(pattern);
+        }
+    }
+}

src/main/resources/pl/damianszczepanik/jenkins/buildhistorymanager/Messages.properties

@@ -2,3 +2,7 @@
 notInteger=Provided value is not an integer
 # === RULE
 role.notValidMatchAtMost=Provide integer value or -1 if the rule execution should not be limited
+# === FIELDS
+matchingMethodType.EQUALS=Equals pattern
+matchingMethodType.CONTAINS=Contains pattern
+matchingMethodType.MATCHES=Matches pattern (regular expression)

src/main/resources/pl/damianszczepanik/jenkins/buildhistorymanager/model/conditions/BuildDescriptionCondition/config.jelly

@@ -0,0 +1,13 @@
+<?jelly escape-by-default='true'?>
+<j:jelly xmlns:j="jelly:core" xmlns:f="/lib/form">
+
+    <f:entry
+            title="Description matching method"
+            field="matchingMethod">
+        <f:select/>
+    </f:entry>
+    <f:entry title="Pattern" field="pattern">
+        <f:textbox/>
+    </f:entry>
+
+</j:jelly>

src/main/resources/pl/damianszczepanik/jenkins/buildhistorymanager/model/conditions/BuildDescriptionCondition/help.html

@@ -0,0 +1,12 @@
+<p><b>Description</b></p>
+<p>Matches builds that description is equal, contains or matches given pattern.</p>
+
+<p><b>Use cases</b></p>
+<p>Helpful when build description contains text that can be used for decision what to do with the build.</p>
+
+<p><b>Warning!</b></p>
+<p>Leaving <i>pattern</i> field empty makes this condition valid for all builds that have undefined or empty build what
+    is default value for new created builds.</p>
+<p>Methods <i>equals</i> and <i>contains</i> expect to have plain text pattern. To define proper regular expression
+    pattern for matching type follow <a href="https://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html">the
+        guideline</a>.</p>