put ad code into separate file, enhance error checking

ad.go

@@ -0,0 +1,66 @@
+/*
+Copyright © 2023 Thomas von Dein
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package main
+
+import (
+	"log/slog"
+)
+
+type Index struct {
+	Links []string `goquery:".text-module-begin a,[href]"`
+}
+
+type Ad struct {
+	Title     string `goquery:"h1"`
+	Slug      string
+	Id        string
+	Condition string
+	Category  string
+	Price     string   `goquery:"h2#viewad-price"`
+	Created   string   `goquery:"#viewad-extra-info,text"`
+	Text      string   `goquery:"p#viewad-description-text,html"`
+	Images    []string `goquery:".galleryimage-element img,[src]"`
+	Meta      []string `goquery:".addetailslist--detail--value,text"`
+}
+
+// Used by slog to pretty print an ad
+func (ad *Ad) LogValue() slog.Value {
+	return slog.GroupValue(
+		slog.String("title", ad.Title),
+		slog.String("price", ad.Price),
+		slog.String("id", ad.Id),
+		slog.Int("imagecount", len(ad.Images)),
+		slog.Int("bodysize", len(ad.Text)),
+	)
+}
+
+// check for  completeness.  I  erected these  fields to  be mandatory
+// (though I really don't know if  they really are). I consider images
+// and meta  optional. So,  if either  of the  checked fields  here is
+// empty we  return an  error.  All the  checked fields  are extracted
+// using goquery. However,  I think price is optional  since there are
+// ads for gifts as well.
+//
+// Note: we return true for "ad is incomplete" and false for "ad is complete"!
+func (ad *Ad) Incomplete() bool {
+	if ad.Category == "" || ad.Condition == "" || ad.Created == "" || ad.Text == "" {
+		return true
+	}
+
+	return false
+}