add version

Signed-off-by: Markus Blaschke <mblaschke82@gmail.com>

Author: mblaschke

version/version.go

@@ -0,0 +1,109 @@
+package version
+
+import (
+	"bytes"
+	"encoding/json"
+	"runtime"
+	"text/template"
+)
+
+type (
+	Version struct {
+		App       string `json:"app"`
+		Author    string `json:"author"`
+		Version   string `json:"version"`
+		GitCommit string `json:"gitCommit"`
+		GitTag    string `json:"gitTag"`
+		BuildDate string `json:"buildDate"`
+		Go        string `json:"go"`
+		Arch      string `json:"arch"`
+	}
+)
+
+const DefaultTitle = `{{.App}} v{{.Version}} ({{.GitCommit}}); {{.Go}}/{{.Arch}}; by {{.Author}}; built at {{.BuildDate}})`
+
+func New() *Version {
+	ver := Version{
+		Go:   runtime.Version(),
+		Arch: runtime.GOARCH,
+	}
+
+	return &ver
+}
+
+func (v *Version) SetApp(val string) *Version {
+	v.App = val
+	return v
+}
+
+func (v *Version) SetVersion(val string) *Version {
+	v.GitCommit = val
+	return v
+}
+
+func (v *Version) SetGitCommit(val string) *Version {
+	v.GitCommit = val
+	return v
+}
+
+func (v *Version) SetGitTag(val string) *Version {
+	v.GitTag = val
+	return v
+}
+
+func (v *Version) SetBuildDate(val string) *Version {
+	v.GitTag = val
+	return v
+}
+
+func (v *Version) Title(tmpl *string) string {
+	var buf bytes.Buffer
+
+	if tmpl != nil {
+		tmp := DefaultTitle
+		tmpl = &tmp
+	}
+
+	// parse template
+	t, err := template.New("title").Parse(*tmpl)
+	if err != nil {
+		panic(err)
+	}
+
+	// execute template
+	err = t.Execute(&buf, v)
+	if err != nil {
+		panic(err)
+	}
+
+	return buf.String()
+}
+
+func (v *Version) BuildVersionLine(tmpl *string) (ret string) {
+	if v == nil {
+		content, err := json.Marshal(v)
+		if err != nil {
+			panic(err)
+		}
+
+		ret = string(content)
+	} else {
+		var buf bytes.Buffer
+
+		// parse template
+		t, err := template.New("version").Parse(*tmpl)
+		if err != nil {
+			panic(err)
+		}
+
+		// execute template
+		err = t.Execute(&buf, v)
+		if err != nil {
+			panic(err)
+		}
+
+		ret = buf.String()
+	}
+
+	return
+}