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@@ -0,0 +1,116 @@
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+package main
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+
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+import (
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+ "bytes"
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+ "encoding/json"
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+ "fmt"
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+ "html"
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+ "html/template"
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+ "io/ioutil"
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+ "os"
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+ "strings"
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+
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+ "gopkg.in/yaml.v2"
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+
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+ "code.senomas.com/go/util"
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+)
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+
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+// Variables struct
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+type Variables struct {
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+ Env map[string]string
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+}
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+
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+func parseYAML(text string) map[string]interface{} {
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+ val := make(map[string]interface{})
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+ err := yaml.Unmarshal([]byte(text), &val)
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+ util.Check("Invalid yaml [%s] %v", text, err)
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+ return val
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+}
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+
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+func parseJSON(text string) map[string]interface{} {
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+ val := make(map[string]interface{})
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+ err := json.Unmarshal([]byte(text), &val)
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+ util.Check("Invalid json [%s] %v", text, err)
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+ return val
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+}
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+
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+func value(vs ...interface{}) interface{} {
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+ for _, v := range vs {
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+ if v != nil {
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+ return v
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+ }
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+ }
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+ return nil
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+}
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+
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+func cat(spacer string, va ...interface{}) string {
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+ var bb bytes.Buffer
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+ for k, v := range va {
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+ if k > 0 {
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+ bb.WriteString(spacer)
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+ }
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+ fmt.Fprintf(&bb, "%v", v)
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+ }
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+ return bb.String()
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+}
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+
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+func split(v string, sep string) []string {
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+ return strings.Split(v, sep)
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+}
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+
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+func ift(test bool, vt, vf interface{}) interface{} {
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+ if test {
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+ return vt
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+ }
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+ return vf
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+}
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+
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+func get(v map[string]interface{}, key string) interface{} {
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+ return v[key]
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+}
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+
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+func getMap(v map[string]interface{}, keys ...string) interface{} {
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+ var ok bool
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+ for _, kk := range keys {
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+ v, ok = v[kk].(map[string]interface{})
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+ if !ok {
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+ return nil
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+ }
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+ }
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+ return v
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+}
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+
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+func main() {
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+ funcMap := template.FuncMap{
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+ "parseYAML": parseYAML,
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+ "parseJSON": parseJSON,
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+ "value": value,
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+ "cat": cat,
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+ "ift": ift,
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+ "split": split,
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+ "get": get,
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+ "getMap": getMap,
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+ }
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+
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+ var text []byte
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+ var err error
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+
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+ text, err = ioutil.ReadFile(os.Args[1])
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+ util.Check("Error open file %s %v", os.Args[1], err)
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+
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+ tmpl, err := template.New("config").Option("missingkey=zero").Funcs(funcMap).Parse(string(text))
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+ util.Check("Error %v", err)
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+
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+ env := make(map[string]string)
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+
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+ for _, v := range os.Environ() {
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+ splits := strings.Split(v, "=")
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+ env[splits[0]] = strings.Join(splits[1:], "=")
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+ }
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+
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+ var bb bytes.Buffer
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+ err = tmpl.Execute(&bb, &Variables{env})
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+ util.Check("Execute error %v", err)
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+ fmt.Println(html.UnescapeString(bb.String()))
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+}
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+
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