template.go

package boa

import (
	"fmt"
	"io"
	"strings"
	"text/template"
	"unicode"
)

var templateFuncs = template.FuncMap{
	"trim":                    strings.TrimSpace,
	"trimRightSpace":          trimRightSpace,
	"trimTrailingWhitespaces": trimRightSpace,
	"rpad":                    rpad,
	"sliceToCsv":              sliceToCsv,
}

// trimRightSpace trims any trailing whitespace
func trimRightSpace(s string) string {
	return strings.TrimRightFunc(s, unicode.IsSpace)
}

// rpad adds padding to the right of a string.
func rpad(s string, padding int) string {
	template := fmt.Sprintf("%%-%ds", padding)
	return fmt.Sprintf(template, s)
}

// sliceToCsv converts a string slice to a string csv
func sliceToCsv(args []string) string {
	return strings.Join(args, ", ")
}

// tmpl executes the given template text on data, writing the result to w.
func tmpl(w io.Writer, text string, data interface{}) error {
	t := template.New("tmpl")
	t.Funcs(templateFuncs)
	template.Must(t.Parse(text))
	return t.Execute(w, data)
}