package api import ( "fmt" "net/http" "path/filepath" "strings" "github.com/mediocregopher/blog.mediocregopher.com/srv/api/apiutil" "github.com/mediocregopher/blog.mediocregopher.com/srv/post" ) func (a *api) renderIndexHandler() http.Handler { tpl := a.mustParseBasedTpl("index.html") const pageCount = 10 return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) { if path := r.URL.Path; !strings.HasSuffix(path, "/") && filepath.Base(path) != "index.html" { http.Error(rw, "Page not found", 404) return } page, err := apiutil.StrToInt(r.FormValue("p"), 0) if err != nil { apiutil.BadRequest( rw, r, fmt.Errorf("invalid page number: %w", err), ) return } posts, hasMore, err := a.params.PostStore.WithOrderDesc().Get(page, pageCount) if err != nil { apiutil.InternalServerError( rw, r, fmt.Errorf("fetching page %d of posts: %w", page, err), ) return } tplPayload := struct { Posts []post.StoredPost PrevPage, NextPage int }{ Posts: posts, PrevPage: -1, NextPage: -1, } if page > 0 { tplPayload.PrevPage = page - 1 } if hasMore { tplPayload.NextPage = page + 1 } executeTemplate(rw, r, tpl, tplPayload) }) }