Fix multiline comment parsing

Signed-off-by: rustyclock <[email protected]>

editor/sink_attribute_get.go

@@ -193,7 +193,8 @@ func GetAttributeValueAsString(attr *hclwrite.Attribute) (string, error) {
 	var valueTokens hclwrite.Tokens
 	for _, t := range exprTokens {
 		if t.Type == hclsyntax.TokenComment {
-			break
+			t.Bytes = []byte("\n")
+			t.SpacesBefore = 0
 		}
 		valueTokens = append(valueTokens, t)
 	}

editor/sink_attribute_get_test.go

@@ -2,6 +2,8 @@ package editor
 
 import (
 	"testing"
+
+	"github.com/google/go-cmp/cmp"
 )
 
 func TestAttributeGetSink(t *testing.T) {
@@ -52,6 +54,33 @@ a1 = v1
 			ok:      true,
 			want:    "v0\n",
 		},
+		{
+			name: "multiline attribute with comments",
+			src: `
+// attr comment
+a0 = v0
+a1 = [
+  "val1",
+  "val2", // inline comment
+  "val3", # another comment
+  "val4",
+  # a ocmment line
+  "val5",
+]
+a2 = v2
+`,
+			address: "a1",
+			ok:      true,
+			want: `[
+  "val1",
+  "val2",
+  "val3",
+  "val4",
+
+  "val5",
+]
+`,
+		},
 		{
 			name: "duplicated attributes should be error",
 			src: `
@@ -209,8 +238,8 @@ b1 "l1" "l2" {
 				t.Fatalf("expected to return an error, but no error, outStream: \n%s", got)
 			}
 
-			if got != tc.want {
-				t.Fatalf("got:\n%s\nwant:\n%s", got, tc.want)
+			if diff := cmp.Diff(tc.want, got); diff != "" {
+				t.Fatalf("got:\n%s\nwant:\n%s\ndiff(-want +got):\n%v", got, tc.want, diff)
 			}
 		})
 	}