79 lines
2.0 KiB
Go
79 lines
2.0 KiB
Go
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package templates
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import (
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"fmt"
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"strings"
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)
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// StringMapLookupDefaultEmptyFunc is function which takes a map[string]string and returns a template function which
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// takes a string which is used as a key lookup for the map[string]string. If the value isn't found it returns an empty
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// string.
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func StringMapLookupDefaultEmptyFunc(m map[string]string) func(key string) (value string) {
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return func(key string) (value string) {
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var ok bool
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if value, ok = m[key]; !ok {
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return ""
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}
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return value
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}
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}
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// StringMapLookupFunc is function which takes a map[string]string and returns a template function which
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// takes a string which is used as a key lookup for the map[string]string. If the value isn't found it returns an error.
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func StringMapLookupFunc(m map[string]string) func(key string) (value string, err error) {
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return func(key string) (value string, err error) {
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var ok bool
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if value, ok = m[key]; !ok {
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return value, fmt.Errorf("failed to lookup key '%s' from map", key)
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}
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return value, nil
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}
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}
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// IterateFunc is a template function which takes a single uint returning a slice of units from 0 up to that number.
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func IterateFunc(count *uint) (out []uint) {
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var i uint
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for i = 0; i < (*count); i++ {
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out = append(out, i)
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}
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return
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}
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// StringsSplitFunc is a template function which takes sep and value, splitting the value by the sep into a slice.
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func StringsSplitFunc(value, sep string) []string {
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return strings.Split(value, sep)
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}
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// StringJoinXFunc takes a list of string elements, joins them by the sep string, before every int n characters are
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// written it writes string p. This is useful for line breaks mostly.
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func StringJoinXFunc(elems []string, sep string, n int, p string) string {
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buf := strings.Builder{}
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c := 0
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e := len(elems) - 1
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for i := 0; i <= e; i++ {
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if c+len(elems[i])+1 > n {
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c = 0
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buf.WriteString(p)
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}
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c += len(elems[i]) + 1
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buf.WriteString(elems[i])
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if i < e {
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buf.WriteString(sep)
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}
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}
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return buf.String()
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}
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