golang Format string by key.

example:

$ go get github.com/hoisie/mustache

package main

import (
    "github.com/hoisie/mustache"

    "bytes"
    "fmt"
    "strings"
    "text/template"
)


func FormatByKey(f string, m map[string]interface{}) (string, error) {
    var tpl bytes.Buffer
    t := template.Must(template.New("").Parse(f))
    if err := t.Execute(&tpl, m); err != nil {
        return f, err
    }
    return tpl.String(), nil
}

func main() {
    // use mustache
    m1 := map[string]interface{}{"age": "47", "c": "world"}
    data := mustache.Render("hello {{c}}, I'm {{age}} years old.
", m1)
    println(data)

    // use golang native template
    m := map[string]interface{}{"name": "John", "age": 47}
    s := "I'm {{.name}}, I'm {{.age}} years old.Hi {{.name}}. Your age is {{.age}}
"
    fmt.Println(FormatByKey(s, m))

    //strings.NewReplacer
    ss := []string{"{{.name}}", "John", "{{.age}}", "47"}
    r := strings.NewReplacer(ss...)
    fmt.Println(r.Replace(s))
}

$ go run test.go

another example.

package main

import (
    "fmt"
    "strings"
)

func main() {
    Tprintf("Hello %{Name}s %{Apos}s", map[string]interface{}{"Name": "GoLang", "Apos": "!"})
}

func Tprintf(format string, params map[string]interface{}) {
    for key, val := range params {
        format = strings.Replace(format, "%{"+key+"}s", fmt.Sprintf("%s", val), -1)
    }
    fmt.Printf(format)
}

Named String Formatting

Golang Template is powerful