Show version requirements for disabled starters

This commit writes the version range information in human readable
format and adds it to the starter list when starters are disabled.

Closes gh-293

initializr-generator/src/main/groovy/io/spring/initializr/metadata/Dependency.groovy

@@ -16,6 +16,7 @@
 
 package io.spring.initializr.metadata
 
+import com.fasterxml.jackson.annotation.JsonIgnore
 import com.fasterxml.jackson.annotation.JsonInclude
 import groovy.transform.AutoClone
 import groovy.transform.AutoCloneStyle
@@ -81,6 +82,9 @@ class Dependency extends MetadataElement {
 
 	String versionRange
 
+	@JsonIgnore
+	String versionRequirement
+
 	String bom
 
 	String repository
@@ -157,7 +161,8 @@ class Dependency extends MetadataElement {
 		}
 		if (versionRange) {
 			try {
-				VersionRange.parse(versionRange)
+				def range = VersionRange.parse(versionRange)
+				versionRequirement = range.toString()
 			} catch (InvalidVersionException ex) {
 				throw new InvalidInitializrMetadataException("Invalid version range '$versionRange' for " +
 						"dependency with id '$id'")
@@ -183,6 +188,7 @@ class Dependency extends MetadataElement {
 				dependency.groupId = mapping.groupId ? mapping.groupId : this.groupId
 				dependency.artifactId = mapping.artifactId ? mapping.artifactId : this.artifactId
 				dependency.version = mapping.version ? mapping.version : this.version
+				dependency.versionRequirement = mapping.range.toString()
 				dependency.mappings = null
 				return dependency
 			}

initializr-generator/src/main/groovy/io/spring/initializr/util/VersionRange.groovy

@@ -38,7 +38,6 @@ import org.springframework.util.Assert
  * @author Stephane Nicoll
  * @since 1.0
  */
-@ToString
 @EqualsAndHashCode
 class VersionRange {
 
@@ -80,6 +79,18 @@ class VersionRange {
 		return true
 	}
 
+	@Override
+	String toString() {
+		StringBuffer sb = new StringBuffer()
+		if (lowerVersion) {
+			sb.append("${lowerInclusive ? '>=' : '>'}${lowerVersion}")
+		}
+		if (higherVersion) {
+		   sb.append(" and ${higherInclusive ? '<=' : '<'}${higherVersion}")
+		}
+		return sb.toString()
+	}
+
 	/**
 	 * Parse the string representation of a {@link VersionRange}. Throws an
 	 * {@link InvalidVersionException} if the range could not be parsed.

initializr-generator/src/test/groovy/io/spring/initializr/metadata/DependencyTests.groovy

@@ -155,6 +155,16 @@ class DependencyTests {
 		dependency.resolve()
 	}
 
+	@Test
+	void resolveVersionRequirement() {
+		def dependency = new Dependency(id: 'web')
+		dependency.mappings << new Dependency.Mapping(
+				versionRange: '[1.1.0.RELEASE, 1.2.0.RELEASE)', version: '0.1.0.RELEASE')
+		dependency.resolve()
+		def resolved = dependency.resolve(Version.parse('1.1.5.RELEASE'))
+		assertEquals ">=1.1.0.RELEASE and <1.2.0.RELEASE", resolved.versionRequirement
+	}
+
 	@Test
 	void resolveMatchingVersionMapping() {
 		def dependency = new Dependency(id: 'web', description: 'A web dependency', version: '0.3.0.RELEASE',

initializr-web/src/main/resources/static/css/spring.css

@@ -69,6 +69,13 @@ input[type=text] {
     margin: 1em 0;
 }
 
+.version-requirement {
+    display: none;
+}
+.disabled .version-requirement {
+    display: block;
+}
+
 /* autocomplete */
 
 #autocomplete, .twitter-typeahead, .tt-hint {

initializr-web/src/main/resources/static/js/start.js

@@ -125,12 +125,12 @@ $(function () {
     var refreshDependencies = function (versionRange) {
         var versions = new Versions();
         $("#dependencies div.checkbox").each(function (idx, item) {
-            if ($(item).attr('data-range') === 'null' || versions.matchRange($(item).attr('data-range'))(versionRange)) {
+            if (!$(item).attr('data-range') || versions.matchRange($(item).attr('data-range'))(versionRange)) {
                 $("input", item).removeAttr("disabled");
-                $(item).removeClass("disabled");
+                $(item).removeClass("disabled has-error");
             } else {
                 $("input", item).prop('checked', false);
-                $(item).addClass("disabled");
+                $(item).addClass("disabled has-error");
                 $("input", item).attr("disabled", true);
                 removeTag($("input", item).val());
             }

initializr-web/src/main/resources/templates/home.html

@@ -139,11 +139,13 @@
                     <div class="form-group col-sm-6">
                         <h3>${it.name}</h3>
                         <% it.content.each { %>
-                        <div class="checkbox" data-range="${it.versionRange}">
+                        <div class="checkbox" data-range="${it.versionRange?:''}">
                             <label>
-                                <input tabindex="13" type="checkbox" name="style" value="${it.id}">
+                                <input tabindex="13" type="checkbox" name="style" value="${it.id}">${it.name}
-                                ${it.name}
                                 <p class="help-block">${it.description}</p>
+                                <% if (it.versionRequirement) { %>
+                                <p class="help-block version-requirement">requires Spring Boot ${it.versionRequirement}</p>
+                                <% } %>
                             </label>
                         </div>
                         <% } %>