template

var ERROR_CLASS = "hasError"

var (
	// The functions available for use in the templates.
	TemplateFuncs = map[string]interface{}{
		"set": func(renderArgs map[string]interface{}, key string, value interface{}) template.JS {
			renderArgs[key] = value
			return template.JS("")
		},
		"append": func(renderArgs map[string]interface{}, key string, value interface{}) template.JS {
			if renderArgs[key] == nil {
				renderArgs[key] = []interface{}{value}
			} else {
				renderArgs[key] = append(renderArgs[key].([]interface{}), value)
			}
			return template.JS("")
		},
		"firstof": func(args ...interface{}) interface{} {
			for _, val := range args {
				switch val.(type) {
				case nil:
					continue
				case string:
					if val == "" {
						continue
					}
					return val
				default:
					return val
				}
			}
			return nil
		},

		"pad": func(str string, width int) template.HTML {
			if len(str) >= width {
				return template.HTML(html.EscapeString(str))
			}
			return template.HTML(html.EscapeString(str) + strings.Repeat(" ", width-len(str)))
		},

		"dump": func(v interface{}) template.HTML {
			return template.HTML(fmt.Sprintf("%v", v))
		},

		"goto": func(uri string) template.JS {
			script := `<script language="javascript">window.location.href="%s";</script>`
			return template.JS(fmt.Sprintf(script, uri))
		},

		"nl2br": func(text string) template.HTML {
			return template.HTML(strings.Replace(template.HTMLEscapeString(text), "\n", "<br>", -1))
		},

		"raw": func(text string) template.HTML {
			return template.HTML(text)
		},

		"date": func(date time.Time) string {
			return fmt.Sprintf("%4d-%02d-%02d", date.Year(), date.Month(), date.Day())
		},
		"datetime": func(date time.Time) string {
			return fmt.Sprintf("%4d-%02d-%02d %02d:%02d:%02d", date.Year(), date.Month(), date.Day(),
				date.Hour(), date.Minute(), date.Second())
		},
		"even": func(a int) bool { return (a % 2) == 0 },
	}
)