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package render
import (
"adammathes.com/snkt/config"
"adammathes.com/snkt/vlog"
"bytes"
"io/ioutil"
"log"
"os"
"path"
"path/filepath"
"regexp"
"text/template"
)
var templates map[string]*template.Template
var BASE_TEMPLATE = "base"
var rel_href, rel_src, re_href, re_src *regexp.Regexp
/*
Renderable interface - objects that render themeslves to a []byte and
know where they should end up in the filesystem
*/
type Renderable interface {
Render() []byte
Target() string
}
func TemplateNames() []string {
templateNames := make([]string, len(templates))
i := 0
for tName, _ := range templates {
templateNames[i] = tName
i++
}
return templateNames
}
func Write(a Renderable) {
if config.Config.Verbose {
vlog.Printf("Writing to %s\n", a.Target())
}
os.MkdirAll(path.Dir(a.Target()), 0755)
err := ioutil.WriteFile(a.Target(), a.Render(), 0755)
if err != nil {
log.Println(err)
}
}
/*
Initializes templates from config.TmplDir
Templates are mapped by filename
*/
func Init() {
templates = make(map[string]*template.Template)
ts, err := filepath.Glob(config.Config.TmplDir + "/*")
if err != nil {
log.Fatal(err)
}
tmplFuncs := template.FuncMap{
"ResolveURLs": ResolveURLs,
"SiteTitle": SiteTitle,
"SiteURL": SiteURL,
}
base := path.Join(config.Config.TmplDir, BASE_TEMPLATE)
for _, t := range ts {
tf := filepath.Base(t)
// Duly Noted: set funcs before parsefiles or you get no funcs
// templates[tf] = template.Must(template.ParseFiles(t, base))
tx := template.New("t").Funcs(tmplFuncs)
templates[tf], err = tx.ParseFiles(base, t)
if err != nil {
// temporary files can confuse this, especially when
// running the file system watcher so we silently
// ignore any templates that disappeared since we started
// since this is usually not a real error condition
delete(templates, tf)
}
}
rel_href = regexp.MustCompile(`href="/(.+)"`)
rel_src = regexp.MustCompile(`src="/(.+)"`)
re_href = regexp.MustCompile(`href="(.*?)"`)
re_src = regexp.MustCompile(`src="(.*?)"`)
}
/*
Render fills the template "name" using data via the BASE_TEMPLATE
*/
func Render(name string, data interface{}) []byte {
return RenderNameVia(name, BASE_TEMPLATE, data)
}
/*
Render fills the template "name" using data
*/
func RenderOnly(name string, data interface{}) []byte {
return RenderNameVia(name, name, data)
}
/*
Render fills the template "name" using data through via (ex: BASE_TEMPLATE)
*/
func RenderNameVia(name string, via string, data interface{}) []byte {
t, ok := templates[name]
if !ok {
log.Printf("can not find template named %s\n", name)
}
var buf bytes.Buffer
err := t.ExecuteTemplate(&buf, via, data)
if err != nil {
log.Println(err)
}
return buf.Bytes()
}
/*
Finds any relative links/images in html and resolves by adding prefix
*/
func ResolveURLs(html, prefix string) string {
bts := []byte(html)
bts = rel_href.ReplaceAll(bts, []byte(`href="`+prefix+`/$1"`))
bts = rel_src.ReplaceAll(bts, []byte(`src="`+prefix+`/$1"`))
return string(bts)
}
/*
Finds all URLs that are hrefs
TODO: replace noisy regex with HTML parser
*/
func FindURLs(html string) []string {
// bts := []byte(html)
hrefs := re_href.FindAllStringSubmatch(html, -1)
var urls []string
for _, href := range hrefs {
urls = append(urls, href[1])
}
return urls
}
/*
Finds all img urls via img src tags
TODO: replace noisy regex with HTML parser
*/
func FindImgs(html string) []string {
// bts := []byte(html)
srcs := re_src.FindAllStringSubmatch(html, -1)
var imgs []string
for _, src := range srcs {
imgs = append(imgs, src[1])
}
return imgs
}
/*
Runs all regex filters specified in config.Config.Filters
*/
func Filter(txt []byte) []byte {
for _, f := range config.Config.Filters {
// TODO: only compile these once at init
re := regexp.MustCompile(f.S)
txt = re.ReplaceAll(txt, []byte(f.R))
}
return txt
}
func TmplExists(t string) bool {
_, ok := templates[t]
return ok
}
func SiteTitle() string {
return config.Config.SiteTitle
}
func SiteURL() string {
return config.Config.SiteURL
}
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