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package formats
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,
// strings.Title is deprecated since go 1.18
// However for our use case it is still fine. The recommended replacement
// is adding about 400kb binary size so lets keep using this for now.
//nolint:staticcheck
"title": strings.Title,
"lower": strings.ToLower,
"upper": strings.ToUpper,
"pad": padWithSpace,
"truncate": truncateWithLength,
}
// HeaderFunctions are used to created headers of a table.
// This is a replacement of basicFunctions for header generation
// because we want the header to remain intact.
// Some functions like `split` are irrelevant so not added.
var headerFunctions = template.FuncMap{
"json": func(v string) string {
return v
},
"title": func(v string) string {
return v
},
"lower": func(v string) string {
return v
},
"upper": func(v string) string {
return v
},
"truncate": func(v string, _ int) string {
return v
},
}
// Parse creates a new anonymous template with the basic functions
// and parses the given format.
func Parse(format string) (*template.Template, error) {
return NewParse("", format)
}
// 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]
}
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