Merge pull request #16 from wneessen/14-exampledocs

#14: First effort of adding more example code

Author: Winni Neessen

doc_test.go

@@ -1,9 +1,12 @@
 package mail_test
 
 import (
+	"context"
 	"fmt"
 	"github.com/wneessen/go-mail"
 	"os"
+	"text/template"
+	"time"
 )
 
 // Code example for the NewClient method
@@ -61,3 +64,73 @@ func ExampleClient_DialAndSend() {
 		os.Exit(1)
 	}
 }
+
+// This code example shows how to use Msg.SetBodyString to set a string as message body with
+// different content types
+func ExampleMsg_SetBodyString_differentTypes() {
+	m := mail.NewMsg()
+	m.SetBodyString(mail.TypeTextPlain, "This is a mail body that with content type: text/plain")
+	m.SetBodyString(mail.TypeTextHTML, "<p>This is a mail body that with content type: text/html</p>")
+}
+
+// This code example shows how to use Msg.SetBodyString to set a string as message body a PartOption
+// to override the default encoding
+func ExampleMsg_SetBodyString_withPartOption() {
+	m := mail.NewMsg(mail.WithEncoding(mail.EncodingB64))
+	m.SetBodyString(mail.TypeTextPlain, "This is a mail body that with content type: text/plain",
+		mail.WithPartEncoding(mail.EncodingQP))
+}
+
+// This code example shows how to use a text/template as message Body.
+// Msg.SetBodyHTMLTemplate works anolog to this just with html/template instead
+func ExampleMsg_SetBodyTextTemplate() {
+	type MyStruct struct {
+		Placeholder string
+	}
+	data := MyStruct{Placeholder: "Teststring"}
+	tpl, err := template.New("test").Parse("This is a {{.Placeholder}}")
+	if err != nil {
+		panic(err)
+	}
+
+	m := mail.NewMsg()
+	if err := m.SetBodyTextTemplate(tpl, data); err != nil {
+		panic(err)
+	}
+}
+
+// This code example shows how to utilize the Msg.WriteToSendmail method to send generated mails
+// using a local sendmail installation
+func ExampleMsg_WriteToSendmail() {
+	m := mail.NewMsg()
+	m.SetBodyString(mail.TypeTextPlain, "This is the mail body string")
+	if err := m.FromFormat("Toni Tester", "toni.tester@example.com"); err != nil {
+		panic(err)
+	}
+	if err := m.To("gandalf.tester@example.com"); err != nil {
+		panic(err)
+	}
+	if err := m.WriteToSendmail(); err != nil {
+		panic(err)
+	}
+}
+
+// This code example shows how to send generated mails using a custom context and sendmail-compatbile command
+// using the Msg.WriteToSendmailWithContext method
+func ExampleMsg_WriteToSendmailWithContext() {
+	sendmailPath := "/opt/sendmail/sbin/sendmail"
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
+	defer cancel()
+
+	m := mail.NewMsg()
+	m.SetBodyString(mail.TypeTextPlain, "This is the mail body string")
+	if err := m.FromFormat("Toni Tester", "toni.tester@example.com"); err != nil {
+		panic(err)
+	}
+	if err := m.To("gandalf.tester@example.com"); err != nil {
+		panic(err)
+	}
+	if err := m.WriteToSendmailWithContext(ctx, sendmailPath); err != nil {
+		panic(err)
+	}
+}