From fdf31c7cf4973c36780adf1ad740330657d5225b Mon Sep 17 00:00:00 2001
From: Lev Zakharov <l.j.zakharov@gmail.com>
Date: Thu, 10 Jan 2019 14:40:12 +0300
Subject: [PATCH] Add type helpers to message entities.

---
 types.go      | 58 ++++++++++++++++++++++++++++++++++---
 types_test.go | 80 +++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 134 insertions(+), 4 deletions(-)

diff --git a/types.go b/types.go
index c6cd642..7b4308a 100644
--- a/types.go
+++ b/types.go
@@ -183,7 +183,7 @@ func (m *Message) IsCommand() bool {
 	}
 
 	entity := (*m.Entities)[0]
-	return entity.Offset == 0 && entity.Type == "bot_command"
+	return entity.Offset == 0 && entity.IsCommand()
 }
 
 // Command checks if the message was a command and if it was, returns the
@@ -249,12 +249,62 @@ type MessageEntity struct {
 }
 
 // ParseURL attempts to parse a URL contained within a MessageEntity.
-func (entity MessageEntity) ParseURL() (*url.URL, error) {
-	if entity.URL == "" {
+func (e MessageEntity) ParseURL() (*url.URL, error) {
+	if e.URL == "" {
 		return nil, errors.New(ErrBadURL)
 	}
 
-	return url.Parse(entity.URL)
+	return url.Parse(e.URL)
+}
+
+// IsMention returns true if the type of the message entity is "mention" (@username).
+func (e MessageEntity) IsMention() bool {
+	return e.Type == "mention"
+}
+
+// IsHashtag returns true if the type of the message entity is "hashtag".
+func (e MessageEntity) IsHashtag() bool {
+	return e.Type == "hashtag"
+}
+
+// IsCommand returns true if the type of the message entity is "bot_command".
+func (e MessageEntity) IsCommand() bool {
+	return e.Type == "bot_command"
+}
+
+// IsUrl returns true if the type of the message entity is "url".
+func (e MessageEntity) IsUrl() bool {
+	return e.Type == "url"
+}
+
+// IsEmail returns true if the type of the message entity is "email".
+func (e MessageEntity) IsEmail() bool {
+	return e.Type == "email"
+}
+
+// IsBold returns true if the type of the message entity is "bold" (bold text).
+func (e MessageEntity) IsBold() bool {
+	return e.Type == "bold"
+}
+
+// IsItalic returns true if the type of the message entity is "italic" (italic text).
+func (e MessageEntity) IsItalic() bool {
+	return e.Type == "italic"
+}
+
+// IsCode returns true if the type of the message entity is "code" (monowidth string).
+func (e MessageEntity) IsCode() bool {
+	return e.Type == "code"
+}
+
+// IsPre returns true if the type of the message entity is "pre" (monowidth block).
+func (e MessageEntity) IsPre() bool {
+	return e.Type == "pre"
+}
+
+// IsTextLink returns true if the type of the message entity is "text_link" (clickable text URL).
+func (e MessageEntity) IsTextLink() bool {
+	return e.Type == "text_link"
 }
 
 // PhotoSize contains information about photos.
diff --git a/types_test.go b/types_test.go
index bb7bb64..a5db1d4 100644
--- a/types_test.go
+++ b/types_test.go
@@ -191,6 +191,86 @@ func TestChatIsSuperGroup(t *testing.T) {
 	}
 }
 
+func TestMessageEntityIsMention(t *testing.T) {
+	entity := tgbotapi.MessageEntity{Type: "mention"}
+
+	if !entity.IsMention() {
+		t.Fail()
+	}
+}
+
+func TestMessageEntityIsHashtag(t *testing.T) {
+	entity := tgbotapi.MessageEntity{Type: "hashtag"}
+
+	if !entity.IsHashtag() {
+		t.Fail()
+	}
+}
+
+func TestMessageEntityIsBotCommand(t *testing.T) {
+	entity := tgbotapi.MessageEntity{Type: "bot_command"}
+
+	if !entity.IsCommand() {
+		t.Fail()
+	}
+}
+
+func TestMessageEntityIsUrl(t *testing.T) {
+	entity := tgbotapi.MessageEntity{Type: "url"}
+
+	if !entity.IsUrl() {
+		t.Fail()
+	}
+}
+
+func TestMessageEntityIsEmail(t *testing.T) {
+	entity := tgbotapi.MessageEntity{Type: "email"}
+
+	if !entity.IsEmail() {
+		t.Fail()
+	}
+}
+
+func TestMessageEntityIsBold(t *testing.T) {
+	entity := tgbotapi.MessageEntity{Type: "bold"}
+
+	if !entity.IsBold() {
+		t.Fail()
+	}
+}
+
+func TestMessageEntityIsItalic(t *testing.T) {
+	entity := tgbotapi.MessageEntity{Type: "italic"}
+
+	if !entity.IsItalic() {
+		t.Fail()
+	}
+}
+
+func TestMessageEntityIsCode(t *testing.T) {
+	entity := tgbotapi.MessageEntity{Type: "code"}
+
+	if !entity.IsCode() {
+		t.Fail()
+	}
+}
+
+func TestMessageEntityIsPre(t *testing.T) {
+	entity := tgbotapi.MessageEntity{Type: "pre"}
+
+	if !entity.IsPre() {
+		t.Fail()
+	}
+}
+
+func TestMessageEntityIsTextLink(t *testing.T) {
+	entity := tgbotapi.MessageEntity{Type: "text_link"}
+
+	if !entity.IsTextLink() {
+		t.Fail()
+	}
+}
+
 func TestFileLink(t *testing.T) {
 	file := tgbotapi.File{FilePath: "test/test.txt"}