Actually it's fine to process extends roots in From and ImportTag

because they use child interpreters

Author: jasmith-hs

src/main/java/com/hubspot/jinjava/lib/tag/FromTag.java

@@ -95,7 +95,7 @@ public String interpret(TagNode tagNode, JinjavaInterpreter interpreter) {
         child.getContext().put(Context.IMPORT_RESOURCE_PATH_KEY, templateFile);
         JinjavaInterpreter.pushCurrent(child);
         try {
-          child.render(node, false);
+          child.render(node);
         } finally {
           JinjavaInterpreter.popCurrent();
         }

src/main/java/com/hubspot/jinjava/lib/tag/ImportTag.java

@@ -102,7 +102,7 @@ public String interpret(TagNode tagNode, JinjavaInterpreter interpreter) {
       JinjavaInterpreter.pushCurrent(child);
 
       try {
-        child.render(node, false);
+        child.render(node);
       } finally {
         JinjavaInterpreter.popCurrent();
       }

src/main/java/com/hubspot/jinjava/lib/tag/eager/EagerFromTag.java

@@ -79,7 +79,7 @@ public String getEagerTagImage(TagToken tagToken, JinjavaInterpreter interpreter
         JinjavaInterpreter.pushCurrent(child);
         String output;
         try {
-          output = child.render(node, false);
+          output = child.render(node);
         } finally {
           JinjavaInterpreter.popCurrent();
         }

src/main/java/com/hubspot/jinjava/lib/tag/eager/EagerImportTag.java

@@ -64,7 +64,7 @@ public String getEagerTagImage(TagToken tagToken, JinjavaInterpreter interpreter
       String output;
       try {
         eagerImportingStrategy.setup(child);
-        output = child.render(node, false);
+        output = child.render(node);
       } finally {
         JinjavaInterpreter.popCurrent();
       }

src/test/java/com/hubspot/jinjava/ExpectedTemplateInterpreter.java

@@ -15,6 +15,7 @@ public class ExpectedTemplateInterpreter {
   private Jinjava jinjava;
   private JinjavaInterpreter interpreter;
   private String path;
+  private boolean sensibleCurrentPath = false;
 
   public ExpectedTemplateInterpreter(
     Jinjava jinjava,
@@ -26,6 +27,26 @@ public ExpectedTemplateInterpreter(
     this.path = path;
   }
 
+  public static ExpectedTemplateInterpreter withSensibleCurrentPath(
+    Jinjava jinjava,
+    JinjavaInterpreter interpreter,
+    String path
+  ) {
+    return new ExpectedTemplateInterpreter(jinjava, interpreter, path, true);
+  }
+
+  private ExpectedTemplateInterpreter(
+    Jinjava jinjava,
+    JinjavaInterpreter interpreter,
+    String path,
+    boolean sensibleCurrentPath
+  ) {
+    this.jinjava = jinjava;
+    this.interpreter = interpreter;
+    this.path = path;
+    this.sensibleCurrentPath = sensibleCurrentPath;
+  }
+
   public String assertExpectedOutput(String name) {
     String template = getFixtureTemplate(name);
     String output = JinjavaInterpreter.getCurrent().render(template);
@@ -116,6 +137,13 @@ public String assertExpectedNonEagerOutput(String name) {
 
   public String getFixtureTemplate(String name) {
     try {
+      if (sensibleCurrentPath) {
+        JinjavaInterpreter
+          .getCurrent()
+          .getContext()
+          .getCurrentPathStack()
+          .push(String.format("%s/%s.jinja", path, name), 0, 0);
+      }
       return Resources.toString(
         Resources.getResource(String.format("%s/%s.jinja", path, name)),
         StandardCharsets.UTF_8

src/test/java/com/hubspot/jinjava/FullSnippetsTest.java

@@ -39,7 +39,7 @@ public String getString(
           JinjavaInterpreter interpreter
         ) throws IOException {
           return Resources.toString(
-            Resources.getResource(String.format("tags/macrotag/%s", fullName)),
+            Resources.getResource(relativePathResolver.resolve(fullName, interpreter)),
             StandardCharsets.UTF_8
           );
         }
@@ -66,7 +66,11 @@ public Optional<LocationResolver> getLocationResolver() {
     );
     interpreter = new JinjavaInterpreter(parentInterpreter);
     expectedTemplateInterpreter =
-      new ExpectedTemplateInterpreter(jinjava, interpreter, "snippets");
+      ExpectedTemplateInterpreter.withSensibleCurrentPath(
+        jinjava,
+        interpreter,
+        "snippets"
+      );
     localContext = interpreter.getContext();
 
     JinjavaInterpreter.pushCurrent(interpreter);
@@ -101,4 +105,11 @@ public void itUsesLowerScopeValueInMacroEvaluation() {
       "uses-lower-scope-value-in-macro-evaluation"
     );
   }
+
+  @Test
+  public void itFromTagDoesntStealExtends() {
+    expectedTemplateInterpreter.assertExpectedOutput(
+      "from-tag-doesnt-steal-extends/test"
+    );
+  }
 }

src/test/resources/snippets/from-tag-doesnt-steal-extends/base.jinja

@@ -0,0 +1,3 @@
+{% block content %}
+yo
+{% endblock %}

src/test/resources/snippets/from-tag-doesnt-steal-extends/something-to-import.jinja

@@ -0,0 +1 @@
+{% set foo = 'hi' %}

src/test/resources/snippets/from-tag-doesnt-steal-extends/test.expected.jinja

@@ -0,0 +1 @@
+<p>Test</p>

src/test/resources/snippets/from-tag-doesnt-steal-extends/test.jinja

@@ -0,0 +1,7 @@
+{% extends './base.jinja' %}
+{% from './something-to-import.jinja' import foo %}
+{{ foo }}
+Don't show me!
+{% block content %}
+  <p>Test</p>
+{% endblock %}