test and doc whitespace control for expressions

README.md

@@ -260,13 +260,14 @@ env.set_trim_blocks(true);
 env.set_lstrip_blocks(true);
 ```
 
-With both `trim_blocks` and `lstrip_blocks` enabled, you can put statements on their own lines. Furthermore, you can also strip whitespaces by hand. If you add a minus sign (`-`) to the start or end of a statement, the whitespaces before or after that block will be removed:
+With both `trim_blocks` and `lstrip_blocks` enabled, you can put statements on their own lines. Furthermore, you can also strip whitespaces for both statements and expressions by hand. If you add a minus sign (`-`) to the start or end, the whitespaces before or after that block will be removed:
 
 ```.cpp
+render("Hello       {{- name -}}     !", data); // "Hello Inja!"
 render("{% if neighbour in guests -%}   I was there{% endif -%}   !", data); // Renders without any whitespaces
 ```
 
-Stripping behind a statement also remove any newlines.
+Stripping behind a statement or expression also removes any newlines.
 
 ### Callbacks
 

test/test-renderer.cpp

@@ -204,6 +204,10 @@ TEST_CASE("templates") {
     CHECK(env.render("Test\n   {%- if is_happy %}{{ name }}{% endif %}   ", data) == "Test\nPeter   ");
     CHECK(env.render("   {%+ if is_happy %}{{ name }}{% endif %}", data) == "   Peter");
     CHECK(env.render("   {%- if is_happy %}{{ name }}{% endif -%}   \n   ", data) == "Peter");
+
+    CHECK(env.render("   {{- name -}}   \n   ", data) == "Peter");
+    CHECK(env.render("Test\n   {{- name }}   ", data) == "Test\nPeter   ");
+    CHECK(env.render("   {{ name }}\n ", data) == "   Peter\n ");
 
     // Nothing will be stripped if there are other characters before the start of the block.
     CHECK(env.render(".  {%- if is_happy %}{{ name }}{% endif -%}\n", data) == ".  Peter");