Use idiomatic error messaging and variable naming, and don't make unnecessary changes.

jsonenums.go

@@ -92,16 +92,16 @@ func main() {
 	types := strings.Split(*typeNames, ",")
 
 	// Only one directory at a time can be processed, and the default is ".".
-	inDir := "."
+	dir := "."
 	if args := flag.Args(); len(args) == 1 {
-		inDir = args[0]
+		dir = args[0]
 	} else if len(args) > 1 {
 		log.Fatalf("only one directory at a time")
 	}
-	dir, err := filepath.Abs(inDir)
+	dir, err := filepath.Abs(dir)
 	if err != nil {
-		log.Fatalf("Unable to determine absolute filepath for requested path %s: %v",
-			inDir, err)
+		log.Fatalf("unable to determine absolute filepath for requested path %s: %v",
+			dir, err)
 	}
 
 	pkg, err := parser.ParsePackage(dir)

parser/parser.go

@@ -36,11 +36,11 @@ func ParsePackage(directory string) (*Package, error) {
 			build.Default.GOPATH, err)
 	}
 
-	loaderConf := loader.Config{TypeChecker: types.Config{FakeImportC: true}}
-	loaderConf.Import(relDir)
-	program, err := loaderConf.Load()
+	conf := loader.Config{TypeChecker: types.Config{FakeImportC: true}}
+	conf.Import(relDir)
+	program, err := conf.Load()
 	if err != nil {
-		return nil, fmt.Errorf("Couldn't load package: %v", err)
+		return nil, fmt.Errorf("couldn't load package: %v", err)
 	}
 
 	pkgInfo := program.Package(relDir)

server/server.go

@@ -47,7 +47,7 @@ func generateHandler(w http.ResponseWriter, r *http.Request) error {
 	}
 	defer os.RemoveAll(dir)
 
-	pkg, err := parser.ParsePackage(dir, "", "")
+	pkg, err := parser.ParsePackage(dir)
 	if err != nil {
 		return fmt.Errorf("parse package: %v", err)
 	}