Add pagination for "my books" display

internal/appcontext/main.go

@@ -2,6 +2,7 @@ package appcontext
 
 import (
 	"errors"
+	"strconv"
 
 	"git.artlef.fr/PersonalLibraryManager/internal/config"
 	"git.artlef.fr/PersonalLibraryManager/internal/model"
@@ -26,3 +27,21 @@ func (ac AppContext) GetAuthenticatedUser() (model.User, error) {
 	res := ac.Db.Where("name = ?", username).First(&user)
 	return user, res.Error
 }
+
+func (ac AppContext) GetQueryLimit() (int, error) {
+	l := ac.C.Query("limit")
+	if l != "" {
+		return strconv.Atoi(l)
+	} else {
+		return ac.Config.Limit, nil
+	}
+}
+
+func (ac AppContext) GetQueryOffset() (int, error) {
+	o := ac.C.Query("offset")
+	if o != "" {
+		return strconv.Atoi(o)
+	} else {
+		return 0, nil
+	}
+}