github.com/flavio/docker@v0.1.3-0.20170117145210-f63d1a6eec47/pkg/templates/templates.go (about)

     1  package templates
     2  
     3  import (
     4  	"encoding/json"
     5  	"strings"
     6  	"text/template"
     7  )
     8  
     9  // basicFunctions are the set of initial
    10  // functions provided to every template.
    11  var basicFunctions = template.FuncMap{
    12  	"json": func(v interface{}) string {
    13  		a, _ := json.Marshal(v)
    14  		return string(a)
    15  	},
    16  	"split": strings.Split,
    17  	"join":  strings.Join,
    18  	"title": strings.Title,
    19  	"lower": strings.ToLower,
    20  	"upper": strings.ToUpper,
    21  	"pad":   padWithSpace,
    22  }
    23  
    24  // Parse creates a new annonymous template with the basic functions
    25  // and parses the given format.
    26  func Parse(format string) (*template.Template, error) {
    27  	return NewParse("", format)
    28  }
    29  
    30  // NewParse creates a new tagged template with the basic functions
    31  // and parses the given format.
    32  func NewParse(tag, format string) (*template.Template, error) {
    33  	return template.New(tag).Funcs(basicFunctions).Parse(format)
    34  }
    35  
    36  // padWithSpace adds whitespace to the input if the input is non-empty
    37  func padWithSpace(source string, prefix, suffix int) string {
    38  	if source == "" {
    39  		return source
    40  	}
    41  	return strings.Repeat(" ", prefix) + source + strings.Repeat(" ", suffix)
    42  }