2 files changed, 110 insertions, 3 deletions
diff --git a/internal/config/config.go b/internal/config/config.go
index 6497ce1..a37cef1 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -10,15 +10,17 @@ import (
 type Map map[string]interface{}
 
 type GlobalOptions struct {
-	Timeout      int    `yaml:"timeout"`
-	DefaultEmail string `yaml:"default-email"`
-	Target       string `yaml:"target"`
+	Timeout      int      `yaml:"timeout"`
+	DefaultEmail string   `yaml:"default-email"`
+	Target       string   `yaml:"target"`
+	Parts        []string `yaml:"parts"`
 }
 
 var DefaultGlobalOptions = GlobalOptions{
 	Timeout:      30,
 	DefaultEmail: username() + "@" + hostname(),
 	Target:       "",
+	Parts:        []string{"text", "html"},
 }
 
 type Config struct {
@@ -31,6 +33,26 @@ type Options struct {
 	InclImages *bool `yaml:"include-images"`
 }
 
+func (c *Config) WithPartText() bool {
+	for _, part := range c.Parts {
+		if part == "text" {
+			return true
+		}
+	}
+
+	return false
+}
+
+func (c *Config) WithPartHtml() bool {
+	for _, part := range c.Parts {
+		if part == "html" {
+			return true
+		}
+	}
+
+	return false
+}
+
 func hostname() (hostname string) {
 	hostname, err := os.Hostname()
 	if err != nil {
diff --git a/internal/feed/mail.go b/internal/feed/mail.go
new file mode 100644
index 0000000..d166e09
--- /dev/null
+++ b/internal/feed/mail.go
@@ -0,0 +1,85 @@
+package feed
+
+import (
+	"bytes"
+	"io"
+	"time"
+
+	"github.com/emersion/go-message/mail"
+
+	"github.com/Necoro/feed2imap-go/internal/config"
+)
+
+func address(name, address string) []*mail.Address {
+	return []*mail.Address{{name, address}}
+}
+
+func fromAdress(feed Feed, item feeditem, cfg config.Config) []*mail.Address {
+	switch {
+	case item.Item.Author != nil && item.Item.Author.Email != "":
+		return address(item.Item.Author.Name, item.Item.Author.Email)
+	case item.Item.Author != nil && item.Item.Author.Name != "":
+		return address(item.Item.Author.Name, cfg.DefaultEmail)
+	case item.Feed.Author != nil && item.Feed.Author.Email != "":
+		return address(item.Feed.Author.Name, item.Feed.Author.Email)
+	case item.Feed.Author != nil && item.Feed.Author.Name != "":
+		return address(item.Feed.Author.Name, cfg.DefaultEmail)
+	default:
+		return address(feed.Name, cfg.DefaultEmail)
+	}
+}
+
+func asMail(feed Feed, item feeditem, cfg config.Config) (string, error) {
+	var b bytes.Buffer
+
+	var h mail.Header
+	h.SetAddressList("From", fromAdress(feed, item, cfg))
+	h.SetAddressList("To", address(feed.Name, cfg.DefaultEmail))
+
+	{ // date
+		date := item.Item.PublishedParsed
+		if date == nil {
+			now := time.Now()
+			date = &now
+		}
+		h.SetDate(*date)
+	}
+	{ // subject
+		subject := item.Item.Title
+		if subject == "" {
+			subject = item.Item.Published
+		}
+		if subject == "" {
+			subject = item.Item.Link
+		}
+		h.SetSubject(subject)
+	}
+
+	mw, err := mail.CreateWriter(&b, h)
+	if err != nil {
+		return "", err
+	}
+
+	if cfg.WithPartText() {
+		tw, err := mw.CreateInline()
+		if err != nil {
+			return "", err
+		}
+
+		var th mail.InlineHeader
+		th.SetContentType("text/plain", map[string]string{"charset": "utf-8", "format": "flowed"})
+
+		w, err := tw.CreatePart(th)
+		if err != nil {
+			return "", err
+		}
+		_, _ = io.WriteString(w, "Who are you?")
+
+		_ = w.Close()
+		_ = tw.Close()
+	}
+
+	_ = mw.Close()
+
+	return b.String(), nil
+}