golangでellipsis ref: http://qiita.com/kyoh86/items/6393e2d7567e71ea741d

ellipse.go

package main

// Ellipsis a text
func Ellipsis(length int, text string) string {
    r := []rune(text)
    if len(r) > length {
        return string(r[0:length]) + "..."
    }
    return text
}

ellipsis.go

package main

// Ellipsis a text
func Ellipsis(length int, text string) string {
    r := []rune(text)
    if len(r) > length {
        return string(r[0:length]) + "..."
    }
    return text
}

sample.go

package main

import (
    "bytes"
    "fmt"
    "text/template"
)

func main() {
    var buf bytes.Buffer
    template.New("text").
        Funcs(template.FuncMap{"ellipsis": Ellipse}).
        Parse(`{{.value | ellipsis 5}}`).
        Execute(buf, map[string]string{"value": "みんみんみらくる☆"})
    fmt.Println(buf.String())
}