adding fetching and saving an entire book

internal/fetcher/savechapter.go

@@ -0,0 +1,59 @@
+package fetcher
+import (
+	"log"
+	"project.hechon.fr/internal/config"
+	"project.hechon.fr/internal/models"
+	"gopkg.in/yaml.v3"
+	"os"
+	"path"
+	"strconv"
+)
+
+
+func SaveChapter(cfg config.Cfg, chapter *config.Chapter) (error){
+	var chapterYaml models.Yaml
+
+	for i, verse:= range chapter.Verses{
+		strophe := models.Strophe{} 
+		parts := SplitInPart(verse, cfg.ProperName)
+		for _, part := range parts{
+			line := models.Line{
+				Verse: i+1,
+				Text: part,
+				Who: "",
+				To: "",
+				Of: "",
+			}
+
+			strophe.Lines = append(strophe.Lines, line)
+		}
+		chapterYaml.Strophes = append(chapterYaml.Strophes, strophe)
+		log.Printf("%v", parts)
+	}
+
+	yamlData, err := yaml.Marshal(chapterYaml)
+	if err != nil{
+		
+		log.Printf("failed unpacking this yaml struct:%v", chapterYaml)
+		return err
+	}
+
+	fileName := path.Join(cfg.YamlPath, cfg.Book.Name + strconv.Itoa(chapter.Number) + ".yaml")
+	_,err = os.Stat(fileName)
+	if err == nil {
+		err = os.Remove(fileName)
+		 if err != nil {
+			 log.Printf("can’t remove %v: %v", fileName, err)
+			 return err
+		 }
+	}
+
+	err = os.WriteFile(fileName, yamlData, 0600)
+	if err != nil{
+		log.Printf("can’t write into %v", fileName)
+		return err
+	}
+
+	return nil
+}
+