Merge pull request #1 from version-go/initial-funcs

All initial funcs plus module info.

go.mod

@@ -0,0 +1,3 @@
+module github.com/version-go/ldflags
+
+go 1.13

version.go

@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2020 Alex <alex@webz.asia>
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ *   @author Alex <alex@webz.asia>
+ *   @copyright Copyright (c) 2020 Alex <alex@webz.asia>
+ *   @since 03.10.2020
+ *
+ */
+
+package ldflags
+
+type buildInfo struct {
+	version string
+	hash    string
+	time    string
+}
+
+var (
+	buildVersion = "unknown"
+	buildHash    = "unknown"
+	buildTime    = "unknown"
+	info         *buildInfo
+)
+
+func init() {
+	info = New()
+}
+
+// New works as a singleton
+func New() *buildInfo {
+	if info == nil {
+		info = &buildInfo{
+			buildVersion, buildHash, buildTime,
+		}
+	}
+	return info
+}
+
+// Version returns build version if provided, "unknown" otherwise
+func Version() string {
+	return info.version
+}
+
+// Build returns build hash if provided, "unknown" otherwise
+func Build() string {
+	return info.hash
+}
+
+// Time returns build time if provided, "unknown" otherwise
+func Time() string {
+	return info.time
+}