67 lines
1.6 KiB
Go
67 lines
1.6 KiB
Go
package funcmap
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import (
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"fmt"
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"html/template"
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"reflect"
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"strings"
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"github.com/mikestefanello/pagoda/config"
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"github.com/Masterminds/sprig"
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"github.com/labstack/gommon/random"
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)
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var (
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// CacheBuster stores a random string used as a cache buster for static files.
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CacheBuster = random.String(10)
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)
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// GetFuncMap provides a template function map
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func GetFuncMap() template.FuncMap {
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// See http://masterminds.github.io/sprig/ for available funcs
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funcMap := sprig.FuncMap()
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// Provide a list of custom functions
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// Expand this as you add more functions to this package
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// Avoid using a name already in use by sprig
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f := template.FuncMap{
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"hasField": HasField,
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"file": File,
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"link": Link,
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}
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for k, v := range f {
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funcMap[k] = v
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}
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return funcMap
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}
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// HasField checks if an interface contains a given field
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func HasField(v interface{}, name string) bool {
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rv := reflect.ValueOf(v)
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if rv.Kind() == reflect.Ptr {
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rv = rv.Elem()
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}
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if rv.Kind() != reflect.Struct {
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return false
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}
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return rv.FieldByName(name).IsValid()
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}
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// File appends a cache buster to a given filepath so it can remain cached until the app is restarted
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func File(filepath string) string {
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return fmt.Sprintf("/%s/%s?v=%s", config.StaticPrefix, filepath, CacheBuster)
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}
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// Link outputs HTML for a link element, providing the ability to dynamically set the active class
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func Link(url, text, currentPath string, classes ...string) template.HTML {
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if currentPath == url {
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classes = append(classes, "is-active")
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}
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html := fmt.Sprintf(`<a class="%s" href="%s">%s</a>`, strings.Join(classes, " "), url, text)
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return template.HTML(html)
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}
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