Maintain whitespace (#678)

CHANGELOG.md

@@ -9,6 +9,7 @@ Each tagged version of Datastar is accompanied by a release note. Read the [rele
 ### Changed
 
 - Updated Idiomorph to version [0.7.1](https://github.com/bigskysoftware/idiomorph/blob/main/CHANGELOG.md#071---2025-02-13).
+- Whitespace is now maintained in merged fragments ([#658](https://github.com/starfederation/datastar/issues/658)).
 
 ### Fixed
 

library/src/plugins/official/backend/actions/sse.ts

@@ -132,7 +132,7 @@ export const sse = async (
             argLines = []
             argsRawLines[key] = argLines
           }
-          const value = line.slice(colonIndex + 1).trim()
+          const value = line.slice(colonIndex + 1)
           argLines.push(value)
         }
 

site/routes_tests.go

@@ -33,6 +33,7 @@ func setupTests(ctx context.Context, router chi.Router, signals sessions.Store)
 				{ID: "local_signals"},
 				{ID: "merge_fragment"},
 				{ID: "merge_fragment_signal"},
+				{ID: "merge_fragment_whitespace"},
 				{ID: "on_load"},
 				{ID: "ref"},
 				{ID: "remove_fragment"},
@@ -91,6 +92,7 @@ func setupTests(ctx context.Context, router chi.Router, signals sessions.Store)
 
 		if err := errors.Join(
 			setupTestsMergeFragment(testsRouter),
+			setupTestsMergeFragmentWhitespace(testsRouter),
 			setupTestsMergeFragmentSignal(testsRouter),
 			setupTestsOnLoad(testsRouter),
 			setupTestsRemoveFragment(testsRouter),

site/routes_tests_merge_fragment_whitespace.go

@@ -0,0 +1,20 @@
+package site
+
+import (
+	"net/http"
+
+	"github.com/go-chi/chi/v5"
+	datastar "github.com/starfederation/datastar/sdk/go"
+)
+
+func setupTestsMergeFragmentWhitespace(testsRouter chi.Router) error {
+
+	testsRouter.Get("/merge_fragment_whitespace/data", func(w http.ResponseWriter, r *http.Request) {
+		sse := datastar.NewSSE(w, r)
+		c := `<pre id="fragment" data-signals-result="ctx.el.innerHTML == 'foo\n    bar' ? 1 : 0">foo
+    bar</pre>`
+		sse.MergeFragments(c)
+	})
+
+	return nil
+}

site/smoketests/merge_fragment_whitespace_test.go

@@ -0,0 +1,9 @@
+package smoketests
+
+import (
+	"testing"
+)
+
+func TestMergeFragmentWhitespace(t *testing.T) {
+	setupPageTestOnClick(t, "tests/merge_fragment_whitespace")
+}

site/static/md/tests/merge_fragment_whitespace.md

@@ -0,0 +1,13 @@
+# Merge Fregment Whitespace
+
+Tests that merging a fragment maintains whitespace.
+
+<div>
+  <pre id="fragment" data-signals-result="0"></pre>
+  <button data-on-click="@get('/tests/merge_fragment_whitespace/data')" class="btn">Merge</button>
+  <hr />
+  Result:
+  <code data-text="$result">0</code>
+  <hr />
+  Expected result on click: <code>1</code>
+</div>