| package templates // import "github.com/docker/docker/daemon/logger/templates" |
| |
| import ( |
| "bytes" |
| "encoding/json" |
| "strings" |
| "text/template" |
| ) |
| |
| // basicFunctions are the set of initial |
| // functions provided to every template. |
| var basicFunctions = template.FuncMap{ |
| "json": func(v interface{}) string { |
| buf := &bytes.Buffer{} |
| enc := json.NewEncoder(buf) |
| enc.SetEscapeHTML(false) |
| enc.Encode(v) |
| // Remove the trailing new line added by the encoder |
| return strings.TrimSpace(buf.String()) |
| }, |
| "split": strings.Split, |
| "join": strings.Join, |
| "title": strings.Title, |
| "lower": strings.ToLower, |
| "upper": strings.ToUpper, |
| "pad": padWithSpace, |
| "truncate": truncateWithLength, |
| } |
| |
| // NewParse creates a new tagged template with the basic functions |
| // and parses the given format. |
| func NewParse(tag, format string) (*template.Template, error) { |
| return template.New(tag).Funcs(basicFunctions).Parse(format) |
| } |
| |
| // padWithSpace adds whitespace to the input if the input is non-empty |
| func padWithSpace(source string, prefix, suffix int) string { |
| if source == "" { |
| return source |
| } |
| return strings.Repeat(" ", prefix) + source + strings.Repeat(" ", suffix) |
| } |
| |
| // truncateWithLength truncates the source string up to the length provided by the input |
| func truncateWithLength(source string, length int) string { |
| if len(source) < length { |
| return source |
| } |
| return source[:length] |
| } |