Go: make generated code more compliant to "go fmt" (google#7907)

Co-authored-by: Derek Bailey <derekbailey@google.com>

src/idl_gen_go.cpp

@@ -541,7 +541,7 @@ class GoGenerator : public BaseGenerator {
     GenReceiver(struct_def, code_ptr);
     code += " " + namer_.Field(field) + "ByKey";
     code += "(obj *" + TypeName(field);
-    code += ", key " + NativeType(key_field.value.type) + ") bool" +
+    code += ", key " + NativeType(key_field.value.type) + ") bool " +
             OffsetPrefix(field);
     code += "\t\tx := rcv._tab.Vector(o)\n";
     code += "\t\treturn ";
@@ -920,8 +920,8 @@ class GoGenerator : public BaseGenerator {
     code += "o1, o2 flatbuffers.UOffsetT, buf []byte) bool {\n";
     code += "\tobj1 := &" + namer_.Type(struct_def) + "{}\n";
     code += "\tobj2 := &" + namer_.Type(struct_def) + "{}\n";
-    code += "\tobj1.Init(buf, flatbuffers.UOffsetT(len(buf)) - o1)\n";
-    code += "\tobj2.Init(buf, flatbuffers.UOffsetT(len(buf)) - o2)\n";
+    code += "\tobj1.Init(buf, flatbuffers.UOffsetT(len(buf))-o1)\n";
+    code += "\tobj2.Init(buf, flatbuffers.UOffsetT(len(buf))-o2)\n";
     if (IsString(field.value.type)) {
       code += "\treturn string(obj1." + namer_.Function(field.name) + "()) < ";
       code += "string(obj2." + namer_.Function(field.name) + "())\n";
@@ -943,13 +943,13 @@ class GoGenerator : public BaseGenerator {
     code += "key " + NativeType(field.value.type) + ", ";
     code += "vectorLocation flatbuffers.UOffsetT, ";
     code += "buf []byte) bool {\n";
-    code += "\tspan := flatbuffers.GetUOffsetT(buf[vectorLocation - 4:])\n";
+    code += "\tspan := flatbuffers.GetUOffsetT(buf[vectorLocation-4:])\n";
     code += "\tstart := flatbuffers.UOffsetT(0)\n";
     if (IsString(field.value.type)) { code += "\tbKey := []byte(key)\n"; }
     code += "\tfor span != 0 {\n";
     code += "\t\tmiddle := span / 2\n";
     code += "\t\ttableOffset := flatbuffers.GetIndirectOffset(buf, ";
-    code += "vectorLocation+ 4 * (start + middle))\n";
+    code += "vectorLocation+4*(start+middle))\n";
 
     code += "\t\tobj := &" + namer_.Type(struct_def) + "{}\n";
     code += "\t\tobj.Init(buf, tableOffset)\n";
@@ -1060,8 +1060,8 @@ class GoGenerator : public BaseGenerator {
 
       code += "\t\treturn &" +
               WrapInNameSpaceAndTrack(&enum_def, NativeName(enum_def)) +
-              "{ Type: " + namer_.EnumVariant(enum_def, ev) +
-              ", Value: x.UnPack() }\n";
+              "{Type: " + namer_.EnumVariant(enum_def, ev) +
+              ", Value: x.UnPack()}\n";
     }
     code += "\t}\n";
     code += "\treturn nil\n";
@@ -1074,7 +1074,7 @@ class GoGenerator : public BaseGenerator {
 
     code += "func (t *" + NativeName(struct_def) +
             ") Pack(builder *flatbuffers.Builder) flatbuffers.UOffsetT {\n";
-    code += "\tif t == nil { return 0 }\n";
+    code += "\tif t == nil {\n\t\treturn 0\n\t}\n";
     for (auto it = struct_def.fields.vec.begin();
          it != struct_def.fields.vec.end(); ++it) {
       const FieldDef &field = **it;
@@ -1144,8 +1144,7 @@ class GoGenerator : public BaseGenerator {
         if (field.value.type.struct_def->fixed) continue;
         code += "\t" + offset + " := t." + field_field + ".Pack(builder)\n";
       } else if (field.value.type.base_type == BASE_TYPE_UNION) {
-        code += "\t" + offset + " := t." + field_field + ".Pack(builder)\n";
-        code += "\t\n";
+        code += "\t" + offset + " := t." + field_field + ".Pack(builder)\n\n";
       } else {
         FLATBUFFERS_ASSERT(0);
       }
@@ -1261,7 +1260,7 @@ class GoGenerator : public BaseGenerator {
 
     code += "func (rcv *" + struct_type + ") UnPack() *" +
             NativeName(struct_def) + " {\n";
-    code += "\tif rcv == nil { return nil }\n";
+    code += "\tif rcv == nil {\n\t\treturn nil\n\t}\n";
     code += "\tt := &" + NativeName(struct_def) + "{}\n";
     code += "\trcv.UnPackTo(t)\n";
     code += "\treturn t\n";
@@ -1273,7 +1272,7 @@ class GoGenerator : public BaseGenerator {
 
     code += "func (t *" + NativeName(struct_def) +
             ") Pack(builder *flatbuffers.Builder) flatbuffers.UOffsetT {\n";
-    code += "\tif t == nil { return 0 }\n";
+    code += "\tif t == nil {\n\t\treturn 0\n\t}\n";
     code += "\treturn Create" + namer_.Type(struct_def) + "(builder";
     StructPackArgs(struct_def, "", code_ptr);
     code += ")\n";
@@ -1317,7 +1316,7 @@ class GoGenerator : public BaseGenerator {
 
     code += "func (rcv *" + namer_.Type(struct_def) + ") UnPack() *" +
             NativeName(struct_def) + " {\n";
-    code += "\tif rcv == nil { return nil }\n";
+    code += "\tif rcv == nil {\n\t\treturn nil\n\t}\n";
     code += "\tt := &" + NativeName(struct_def) + "{}\n";
     code += "\trcv.UnPackTo(t)\n";
     code += "\treturn t\n";
@@ -1505,15 +1504,17 @@ class GoGenerator : public BaseGenerator {
     code += "package " + name_space_name + "\n\n";
     if (needs_imports) {
       code += "import (\n";
+      // standard imports, in alphabetical order for go fmt
       if (needs_bytes_import_) code += "\t\"bytes\"\n";
-      // math is needed to support non-finite scalar default values.
-      if (needs_math_import_) { code += "\t\"math\"\n"; }
-      if (is_enum) { code += "\t\"strconv\"\n"; }
       if (!parser_.opts.go_import.empty()) {
         code += "\tflatbuffers \"" + parser_.opts.go_import + "\"\n";
       } else {
         code += "\tflatbuffers \"github.com/google/flatbuffers/go\"\n";
       }
+      // math is needed to support non-finite scalar default values.
+      if (needs_math_import_) { code += "\t\"math\"\n"; }
+      if (is_enum) { code += "\t\"strconv\"\n"; }
+
       if (tracked_imported_namespaces_.size() > 0) {
         code += "\n";
         for (auto it = tracked_imported_namespaces_.begin();