Initial commit with cru (no delete) of notes

internal/notes/notes.go

@@ -0,0 +1,52 @@
+// Notes implements a data structure for reasoning about and rendering
+// markdown notes
+package notes
+
+import (
+	"bytes"
+	"fmt"
+	"log"
+	"os"
+	"path/filepath"
+
+	"gitea.gwairfelin.com/max/gonotes/internal/conf"
+	"github.com/yuin/goldmark"
+)
+
+// Note is the central data structure.  It can be Saved, Rendered and Loaded
+// using the Save, Render and LoadNote functions.
+type Note struct {
+	Title        string
+	BodyRendered string
+	Body         []byte
+}
+
+func fmtPath(path string) string {
+	return fmt.Sprintf("%s.%s", path, conf.Conf.Extension)
+}
+
+// Save a note to a path derived from the title
+func (n *Note) Save() error {
+	filename := filepath.Join(conf.Conf.NotesDir, fmtPath(n.Title))
+	return os.WriteFile(filename, n.Body, 0600)
+}
+
+// Render the markdown content of the note to HTML
+func (n *Note) Render() {
+	var buf bytes.Buffer
+	err := goldmark.Convert(n.Body, &buf)
+	if err != nil {
+		log.Fatal(err)
+	}
+	n.BodyRendered = buf.String()
+}
+
+// Load a note from the disk. The path is derived from the title
+func LoadNote(title string) (*Note, error) {
+	filename := filepath.Join(conf.Conf.NotesDir, fmtPath(title))
+	body, err := os.ReadFile(filename)
+	if err != nil {
+		return nil, err
+	}
+	return &Note{Title: title, Body: body}, nil
+}