dotcloud/docker

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, //nolint:staticcheck // SA1019: strings.Title is deprecated: The rule Title uses for word boundaries does not handle Unicode punctuation properly. Use golang.org/x/text/cases instead.
    "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]
}