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page_by_tags.go
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/
page_by_tags.go
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package main
import (
"net/http"
officialSort "sort"
)
var tags2Article = map[string]map[aid]struct{}{}
func tagHandler(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/html; charset=UTF-8")
tag := r.URL.Path[len(config["TagsUrl"]):]
if indexList := getArticleByTag(tag); indexList == nil {
if err := tmpl.ExecuteTemplate(w, "tags", map[string]interface{}{
"config": config,
"tags": getAllTags(),
"header": "Tags Cloud",
}); err != nil {
logger.Println("tags:", err.Error())
}
} else {
if err := tmpl.ExecuteTemplate(w, "result", map[string]interface{}{
"config": config,
"articles": indexList,
"header": "Tag: " + tag,
}); err != nil {
logger.Println("tags:", err.Error())
}
}
}
func getAllTags() []string {
ret := []string{}
for k, _ := range tags2Article {
ret = append(ret, k)
}
officialSort.Strings(ret)
return ret
}
func getArticleByTag(t string) []*Article {
var ret []*Article
for id, _ := range tags2Article[t] {
ret = append(ret, getArticle(id))
}
sortSlice(ret, func(a, b interface{}) bool {
return a.(*Article).Id > b.(*Article).Id
})
return ret
}
func updateTags(id aid, old, tags []string) {
for _, tag := range old {
delete(tags2Article[tag], id)
}
for _, tag := range tags {
if _, ex := tags2Article[tag]; !ex {
tags2Article[tag] = map[aid]struct{}{}
}
tags2Article[tag][id] = struct{}{}
}
for _, tag := range old {
if len(tags2Article[tag]) == 0 {
delete(tags2Article, tag)
}
}
}
func initPageTags() {
config["TagsUrl"] = config["RootUrl"] + "tags/"
http.HandleFunc(config["TagsUrl"], getGzipHandler(tagHandler))
for _, article := range getArticleList() {
id := article.Id
for _, tag := range article.Tags {
if _, ex := tags2Article[tag]; !ex {
tags2Article[tag] = map[aid]struct{}{}
}
tags2Article[tag][id] = struct{}{}
}
}
}