mirror of https://github.com/docker/cli.git
97 lines
2.7 KiB
Go
97 lines
2.7 KiB
Go
package templates
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import (
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"bytes"
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"encoding/json"
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"strings"
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"text/template"
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)
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// basicFunctions are the set of initial
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// functions provided to every template.
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var basicFunctions = template.FuncMap{
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"json": func(v interface{}) string {
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buf := &bytes.Buffer{}
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enc := json.NewEncoder(buf)
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enc.SetEscapeHTML(false)
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enc.Encode(v)
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// Remove the trailing new line added by the encoder
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return strings.TrimSpace(buf.String())
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},
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"split": strings.Split,
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"join": strings.Join,
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"title": strings.Title, //nolint:staticcheck // strings.Title is deprecated, but we only use it for ASCII, so replacing with golang.org/x/text is out of scope
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"lower": strings.ToLower,
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"upper": strings.ToUpper,
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"pad": padWithSpace,
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"truncate": truncateWithLength,
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}
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// HeaderFunctions are used to created headers of a table.
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// This is a replacement of basicFunctions for header generation
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// because we want the header to remain intact.
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// Some functions like `pad` are not overridden (to preserve alignment
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// with the columns).
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var HeaderFunctions = template.FuncMap{
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"json": func(v string) string {
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return v
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},
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"split": func(v string, _ string) string {
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// we want the table header to show the name of the column, and not
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// split the table header itself. Using a different signature
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// here, and return a string instead of []string
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return v
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},
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"join": func(v string, _ string) string {
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// table headers are always a string, so use a different signature
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// for the "join" function (string instead of []string)
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return v
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},
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"title": func(v string) string {
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return v
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},
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"lower": func(v string) string {
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return v
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},
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"upper": func(v string) string {
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return v
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},
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"truncate": func(v string, _ int) string {
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return v
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},
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}
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// Parse creates a new anonymous template with the basic functions
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// and parses the given format.
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func Parse(format string) (*template.Template, error) {
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return NewParse("", format)
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}
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// New creates a new empty template with the provided tag and built-in
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// template functions.
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func New(tag string) *template.Template {
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return template.New(tag).Funcs(basicFunctions)
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}
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// NewParse creates a new tagged template with the basic functions
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// and parses the given format.
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func NewParse(tag, format string) (*template.Template, error) {
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return New(tag).Parse(format)
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}
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// padWithSpace adds whitespace to the input if the input is non-empty
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func padWithSpace(source string, prefix, suffix int) string {
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if source == "" {
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return source
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}
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return strings.Repeat(" ", prefix) + source + strings.Repeat(" ", suffix)
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}
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// truncateWithLength truncates the source string up to the length provided by the input
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func truncateWithLength(source string, length int) string {
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if len(source) < length {
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return source
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}
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return source[:length]
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}
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