Support `target(target_type, name)` in `gn edit`

Change-Id: Ic0b136bb5ddebb969411bc9ff56161bd6a6a6964
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/26300
Reviewed-by: Takuto Ikuta <tikuta@google.com>
Commit-Queue: Matt Stark <msta@google.com>

src/gn/build_file_editor.cc

diff --git a/src/gn/build_file_editor.cc b/src/gn/build_file_editor.cc
index cf63da2..3e3ec0e 100644
--- a/src/gn/build_file_editor.cc
+++ b/src/gn/build_file_editor.cc
@@ -12,6 +12,7 @@
 #include "gn/command_format.h"
 #include "gn/edit_subcommands.h"
 #include "gn/filesystem_utils.h"
+#include "gn/functions.h"
 #include "gn/input_file.h"
 #include "gn/label.h"
 #include "gn/loader.h"
@@ -572,10 +573,16 @@
       tree_root_.get(),
       [this, &filter](TreeNode& node_ref) -> std::optional<EditTarget> {
         if (auto* func = node_ref->AsFunctionCallMut()) {
-          if (func->block() && func->args() &&
-              func->args()->contents().size() == 1) {
-            if (auto name =
-                    AsStringLiteral(func->args()->contents()[0].get())) {
+          if (func->block() && func->args()) {
+            std::optional<std::string> name;
+            const auto& args = func->args()->contents();
+            if (args.size() == 1) {
+              name = AsStringLiteral(args[0].get());
+            } else if (args.size() == 2 &&
+                       func->function().value() == functions::kTarget) {
+              name = AsStringLiteral(args[1].get());
+            }
+            if (name) {
               EditTarget target{
                   .is_explicit = true,
                   .label = Label(source_file_.GetDir(), *name),

src/gn/edit_command_unittest.cc

diff --git a/src/gn/edit_command_unittest.cc b/src/gn/edit_command_unittest.cc
index 31276ea..21a2472 100644
--- a/src/gn/edit_command_unittest.cc
+++ b/src/gn/edit_command_unittest.cc
@@ -103,7 +103,7 @@
 TEST_F(EditCommandTest, MultipleTargetsSubset) {
   EXPECT_SUCCESS(DoEdit("set testonly true", {"//:foo"},
                         R"(
-executable("foo") {
+target(my_target_type, "foo") {
   testonly = false
 }
 executable("bar") {
@@ -111,7 +111,7 @@
 }
 )"),
                  Edited(R"(
-executable("foo") {
+target(my_target_type, "foo") {
   testonly = true
 }