Add 'endsWith' handlebars helper function (#14634)

* Add 'endsWith' handlebars helper function

* add tests

* fix test

modules/openapi-generator/src/main/java/org/openapitools/codegen/templating/handlebars/StringHelpers.java

@@ -10,7 +10,7 @@ import java.util.Locale;
 public enum StringHelpers implements Helper<Object> {
 
     /**
-     * Indicates the string starts with the defined value.
+     * Indicates whether the string starts with the given value.
      * For example:
      *
      * <pre>
@@ -39,8 +39,6 @@ public enum StringHelpers implements Helper<Object> {
      * <pre>
      *   {{startsWith a b yes='y' no='n'}}
      * </pre>
-     *
-     * If value is "handlebars.java", the output will be "Handlebars.java".
      */
     startsWith {
         @Override
@@ -57,6 +55,60 @@ public enum StringHelpers implements Helper<Object> {
                 return result ? options.fn() : options.inverse();
             }
 
+            return result
+                    ? options.hash("yes", true)
+                    : options.hash("no", false);
+        }
+    },
+
+    /**
+     * Indicates whether the string ends with the given value.
+     * For example:
+     *
+     * <pre>
+     * {{endsWith a b ["insensitive"]}}
+     * </pre>
+     *
+     * <pre>
+     * {{endsWith a text='b' [insensitive=true]}}
+     * </pre>
+     *
+     * Render 'yes' or 'no':
+     * <pre>
+     *   {{#endsWith a b}}
+     *     yes
+     *   {{else}}
+     *     no
+     *   {{/endsWith}}
+     * </pre>
+     *
+     * Render 'true' or 'false':
+     * <pre>
+     *   {{endsWith a b}}
+     * </pre>
+     *
+     * Render 'y' or 'n':
+     * <pre>
+     *   {{endsWith a b yes='y' no='n'}}
+     * </pre>
+     */
+    endsWith {
+        @Override
+        public Object apply(Object value, Options options) throws IOException {
+            String match = options.param(0, options.hash("text", ""));
+            if (match.length() < 1) {
+                return false;
+            }
+
+            boolean caseInsensitive = options.hash("insensitive", false);
+            boolean result = caseInsensitive
+                    ? value.toString().toLowerCase(Locale.ROOT).endsWith(match.toLowerCase(Locale.ROOT))
+                    : value.toString().endsWith(match);
+
+            if (options.tagType == TagType.SECTION) {
+                return result ? options.fn() : options.inverse();
+            }
+
             return result
                     ? options.hash("yes", true)
                     : options.hash("no", false);

modules/openapi-generator/src/test/java/org/openapitools/codegen/templating/handlebars/StringHelpersTest.java

@@ -83,4 +83,53 @@ public class StringHelpersTest {
         template = "{{startsWith asdf b yes='y' no='n'}}";
         evaluate(data, template, "n");
     }
-}
+
+    @Test(description = "Handlebars StringHelpers.endsWith, section")
+    public void endsWithSectionalTest() throws IOException {
+        HashMap<String, Object> data = new HashMap<String, Object>() {{
+            put("asdf", "asdf");
+            put("df", "df");
+            put("b", "b");
+        }};
+
+        String template = "{{~#endsWith asdf df ~}}yes{{~else~}}no{{~/endsWith~}}";
+        evaluate(data, template, "yes");
+
+        template = "{{~#endsWith asdf b ~}}yes{{~else~}}no{{~/endsWith~}}";
+        evaluate(data, template, "no");
+    }
+
+    @Test(description = "Handlebars StringHelpers.endsWith")
+    public void endsWithTest() throws IOException {
+        HashMap<String, Object> data = new HashMap<String, Object>() {{
+            put("asdf", "asdf");
+            put("ASDF", "ASDF");
+            put("f", "f");
+            put("b", "b");
+        }};
+        evaluate(data, "{{endsWith asdf f}}", "true");
+        evaluate(data, "{{endsWith asdf b}}", "false");
+        evaluate(data, "{{endsWith ASDF f insensitive=true }}", "true");
+        evaluate(data, "{{endsWith ASDF f insensitive=false }}", "false");
+        evaluate(data, "{{endsWith ASDF 'f' insensitive=true }}", "true");
+        evaluate(data, "{{endsWith ASDF b insensitive=true }}", "false");
+        evaluate(data, "{{endsWith ASDF 'b' insensitive=true }}", "false");
+        evaluate(data, "{{endsWith ASDF insensitive=true text='f'}}", "true");
+        evaluate(data, "{{endsWith ASDF insensitive=true text='f' yes='✓' no='✘'}}", "✓");
+        evaluate(data, "{{endsWith ASDF insensitive=false text='f' yes='✓' no='✘'}}", "✘");
+    }
+
+    @Test(description = "Handlebars StringHelpers.endsWith, yes/no override")
+    public void endsWithYesOverrideTest() throws IOException {
+        HashMap<String, Object> data = new HashMap<String, Object>() {{
+            put("asdf", "asdf");
+            put("f", "f");
+            put("b", "b");
+        }};
+        String template = "{{endsWith asdf f yes='y' no='n'}}";
+        evaluate(data, template, "y");
+
+        template = "{{endsWith asdf b yes='y' no='n'}}";
+        evaluate(data, template, "n");
+    }
+}