init version info

.gitignore

@@ -13,3 +13,9 @@
 
 # Dependency directories (remove the comment below to include it)
 # vendor/
+.idea
+
+build
+test
+#local test use
+Makefile

README.md

@@ -1,2 +1,35 @@
 # version
 go build with version 
+
+## usage
+
+```makefile
+# Makefile to build the command lines and tests in this project.
+# This Makefile doesn't consider Windows Environment. If you use it in Windows, please be careful.
+
+SHELL := /bin/bash
+
+#BASEDIR = $(shell pwd)
+BASEDIR = $(dir $(realpath $(firstword $(MAKEFILE_LIST))))
+
+# add following lines before go build!
+versionDir = github.com/xwi88/version
+
+gitBranch = $(shell git symbolic-ref --short -q HEAD)
+
+ifeq ($(gitBranch),)
+gitTag = $(shell git describe --always --tags --abbrev=0)
+endif
+
+buildTime = $(shell date "+%FT%T%z")
+gitCommit = $(shell git rev-parse HEAD)
+gitTreeState = $(shell if git status|grep -q 'clean';then echo clean; else echo dirty; fi)
+
+# -ldflags flags accept a space-separated list of arguments to pass to an underlying tool during the build.
+ldflags="-X ${versionDir}.gitBranch=${gitBranch} -X ${versionDir}.gitTag=${gitTag} \
+ -X ${versionDir}.buildTime=${buildTime} -X ${versionDir}.gitCommit=${gitCommit} \
+ -X ${versionDir}.gitTreeState=${gitTreeState}"
+
+```
+
+`go build -ldflags ${ldflags} `

base.go

@@ -0,0 +1,16 @@
+// Copyright 2020 xwi88.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+// Build info for your project with arguments
+package version
+
+var (
+	gitBranch       string
+	gitTag          string
+	gitCommit       = "$Format:%H$"              // sha1 from git, output of $(git rev-parse HEAD)
+	gitTreeState    = "not a git tree"           // state of git tree, either "clean" or "dirty"
+	buildTime       = ""                         // build date in ISO8601 format, output of $(date -u +'%Y-%m-%dT%H:%M:%SZ')
+	buildTimeLayout = "2006-01-02T15:04:05Z0700" // ref time.RFC3339: 2006-01-02T15:04:05Z07:00
+	execTime        = ""
+)

go.mod

@@ -0,0 +1,3 @@
+module github.com/xwi88/version
+
+go 1.14

version.go

@@ -0,0 +1,61 @@
+// Copyright 2020 xwi88.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+// Build and get info for your project
+package version
+
+import (
+	"encoding/json"
+	"fmt"
+	"runtime"
+	"strings"
+	"time"
+)
+
+// Info contains version information.
+type Info struct {
+	GitBranch    string `json:"git_branch"`
+	GitTag       string `json:"git_tag"`
+	GitCommit    string `json:"git_commit"`
+	GitTreeState string `json:"git_tree_state"`
+	BuildTime    string `json:"build_time"`
+	Compiler     string `json:"compiler"`
+	GoVersion    string `json:"go_version"`
+	Platform     string `json:"platform"`
+	ExecTime     string `json:"exec_time"`
+}
+
+// String returns info as a human-friendly json version string.
+func (info Info) String() string {
+	vv, _ := json.Marshal(info)
+	return fmt.Sprintf("%v", string(vv))
+}
+
+// String returns info as a human-friendly indent json version string.
+func (info Info) StringWithIndent() string {
+	vv, _ := json.MarshalIndent(info, "", " ")
+	return fmt.Sprintf("%v", string(vv))
+}
+
+// Get get the version info
+func Get() Info {
+	loc, _ := time.LoadLocation("Local")
+	buildTimeNow := time.Now().In(loc)
+	execTime = buildTimeNow.Format(buildTimeLayout)
+
+	if len(buildTime) == 0 || strings.Trim(buildTime, "") == "" || strings.Trim(buildTime, "''") == "" {
+		buildTime = buildTimeLayout
+	}
+	return Info{
+		GitBranch:    gitBranch,
+		GitTag:       gitTag,
+		GitCommit:    gitCommit,
+		GitTreeState: gitTreeState,
+		BuildTime:    buildTime,
+		GoVersion:    runtime.Version(),
+		Compiler:     runtime.Compiler,
+		Platform:     fmt.Sprintf("%s/%s", runtime.GOOS, runtime.GOARCH),
+		ExecTime:     execTime,
+	}
+}