Refactor variable names for code readability

Updated variable names in multiple files to enhance code readability and maintainability by replacing abbreviations with full descriptive names. This ensures adherence to the best practices of naming conventions in Go.

file.go

@@ -23,17 +23,17 @@ type File struct {
 }
 
 // WithFileName sets the filename of the File
-func WithFileName(n string) FileOption {
+func WithFileName(name string) FileOption {
 	return func(f *File) {
-		f.Name = n
+		f.Name = name
 	}
 }
 
 // WithFileDescription sets an optional file description of the File that will be
 // added as Content-Description part
-func WithFileDescription(d string) FileOption {
+func WithFileDescription(description string) FileOption {
 	return func(f *File) {
-		f.Desc = d
+		f.Desc = description
 	}
 }
 
@@ -41,12 +41,12 @@ func WithFileDescription(d string) FileOption {
 // Base64 encoding but there might be exceptions, where this might come handy.
 // Please note that quoted-printable should never be used for attachments/embeds. If this
 // is provided as argument, the function will automatically override back to Base64
-func WithFileEncoding(e Encoding) FileOption {
+func WithFileEncoding(encoding Encoding) FileOption {
 	return func(f *File) {
-		if e == EncodingQP {
+		if encoding == EncodingQP {
 			return
 		}
-		f.Enc = e
+		f.Enc = encoding
 	}
 }
 
@@ -56,19 +56,19 @@ func WithFileEncoding(e Encoding) FileOption {
 // could not be guessed. In some cases, however, it might be needed to force
 // this to a specific type. For such situations this override method can
 // be used
-func WithFileContentType(t ContentType) FileOption {
+func WithFileContentType(contentType ContentType) FileOption {
 	return func(f *File) {
-		f.ContentType = t
+		f.ContentType = contentType
 	}
 }
 
 // setHeader sets header fields to a File
-func (f *File) setHeader(h Header, v string) {
+func (f *File) setHeader(header Header, value string) {
-	f.Header.Set(string(h), v)
+	f.Header.Set(string(header), value)
 }
 
 // getHeader return header fields of a File
-func (f *File) getHeader(h Header) (string, bool) {
+func (f *File) getHeader(header Header) (string, bool) {
-	v := f.Header.Get(string(h))
+	v := f.Header.Get(string(header))
 	return v, v != ""
 }

msg.go

@@ -723,7 +723,7 @@ func (m *Msg) SetBodyWriter(
 	opts ...PartOption,
 ) {
 	p := m.newPart(contentType, opts...)
-	p.w = writeFunc
+	p.writeFunc = writeFunc
 	m.parts = []*Part{p}
 }
 
@@ -770,7 +770,7 @@ func (m *Msg) AddAlternativeWriter(
 	opts ...PartOption,
 ) {
 	part := m.newPart(contentType, opts...)
-	part.w = writeFunc
+	part.writeFunc = writeFunc
 	m.parts = append(m.parts, part)
 }
 
@@ -1142,7 +1142,7 @@ func (m *Msg) encodeString(str string) string {
 func (m *Msg) hasAlt() bool {
 	count := 0
 	for _, part := range m.parts {
-		if !part.del {
+		if !part.isDeleted {
 			count++
 		}
 	}
@@ -1167,9 +1167,9 @@ func (m *Msg) hasPGPType() bool {
 // newPart returns a new Part for the Msg
 func (m *Msg) newPart(contentType ContentType, opts ...PartOption) *Part {
 	p := &Part{
-		ctype: contentType,
+		contentType: contentType,
-		cset:  m.charset,
+		charset:     m.charset,
-		enc:   m.encoding,
+		encoding:    m.encoding,
 	}
 
 	// Override defaults with optionally provided MsgOption functions

msg_test.go

@@ -1251,7 +1251,7 @@ func TestMsg_SetBodyString(t *testing.T) {
 			}
 			part := m.parts[0]
 			res := bytes.Buffer{}
-			if _, err := part.w(&res); err != nil && !tt.sf {
+			if _, err := part.writeFunc(&res); err != nil && !tt.sf {
 				t.Errorf("WriteFunc of part failed: %s", err)
 			}
 			if res.String() != tt.want {
@@ -1286,7 +1286,7 @@ func TestMsg_AddAlternativeString(t *testing.T) {
 			}
 			apart := m.parts[1]
 			res := bytes.Buffer{}
-			if _, err := apart.w(&res); err != nil && !tt.sf {
+			if _, err := apart.writeFunc(&res); err != nil && !tt.sf {
 				t.Errorf("WriteFunc of part failed: %s", err)
 			}
 			if res.String() != tt.want {

msgwriter.go

@@ -114,7 +114,7 @@ func (mw *msgWriter) writeMsg(msg *Msg) {
 	}
 
 	for _, part := range msg.parts {
-		if !part.del {
+		if !part.isDeleted {
 			mw.writePart(part, msg.charset)
 		}
 	}
@@ -249,12 +249,12 @@ func (mw *msgWriter) newPart(header map[string][]string) {
 
 // writePart writes the corresponding part to the Msg body
 func (mw *msgWriter) writePart(part *Part, charset Charset) {
-	partCharset := part.cset
+	partCharset := part.charset
 	if partCharset.String() == "" {
 		partCharset = charset
 	}
-	contentType := fmt.Sprintf("%s; charset=%s", part.ctype, partCharset)
+	contentType := fmt.Sprintf("%s; charset=%s", part.contentType, partCharset)
-	contentTransferEnc := part.enc.String()
+	contentTransferEnc := part.encoding.String()
 	if mw.depth == 0 {
 		mw.writeHeader(HeaderContentType, contentType)
 		mw.writeHeader(HeaderContentTransferEnc, contentTransferEnc)
@@ -262,14 +262,14 @@ func (mw *msgWriter) writePart(part *Part, charset Charset) {
 	}
 	if mw.depth > 0 {
 		mimeHeader := textproto.MIMEHeader{}
-		if part.desc != "" {
+		if part.description != "" {
-			mimeHeader.Add(string(HeaderContentDescription), part.desc)
+			mimeHeader.Add(string(HeaderContentDescription), part.description)
 		}
 		mimeHeader.Add(string(HeaderContentType), contentType)
 		mimeHeader.Add(string(HeaderContentTransferEnc), contentTransferEnc)
 		mw.newPart(mimeHeader)
 	}
-	mw.writeBody(part.w, part.enc)
+	mw.writeBody(part.writeFunc, part.encoding)
 }
 
 // writeString writes a string into the msgWriter's io.Writer interface

part.go

@@ -14,18 +14,18 @@ type PartOption func(*Part)
 
 // Part is a part of the Msg
 type Part struct {
-	ctype ContentType
+	contentType ContentType
-	cset  Charset
+	charset     Charset
-	desc  string
+	description string
-	enc   Encoding
+	encoding    Encoding
-	del   bool
+	isDeleted   bool
-	w     func(io.Writer) (int64, error)
+	writeFunc   func(io.Writer) (int64, error)
 }
 
 // GetContent executes the WriteFunc of the Part and returns the content as byte slice
 func (p *Part) GetContent() ([]byte, error) {
 	var b bytes.Buffer
-	if _, err := p.w(&b); err != nil {
+	if _, err := p.writeFunc(&b); err != nil {
 		return nil, err
 	}
 	return b.Bytes(), nil
@@ -33,83 +33,83 @@ func (p *Part) GetContent() ([]byte, error) {
 
 // GetCharset returns the currently set Charset of the Part
 func (p *Part) GetCharset() Charset {
-	return p.cset
+	return p.charset
 }
 
 // GetContentType returns the currently set ContentType of the Part
 func (p *Part) GetContentType() ContentType {
-	return p.ctype
+	return p.contentType
 }
 
 // GetEncoding returns the currently set Encoding of the Part
 func (p *Part) GetEncoding() Encoding {
-	return p.enc
+	return p.encoding
 }
 
 // GetWriteFunc returns the currently set WriterFunc of the Part
 func (p *Part) GetWriteFunc() func(io.Writer) (int64, error) {
-	return p.w
+	return p.writeFunc
 }
 
 // GetDescription returns the currently set Content-Description of the Part
 func (p *Part) GetDescription() string {
-	return p.desc
+	return p.description
 }
 
 // SetContent overrides the content of the Part with the given string
-func (p *Part) SetContent(c string) {
+func (p *Part) SetContent(content string) {
-	buf := bytes.NewBufferString(c)
+	buffer := bytes.NewBufferString(content)
-	p.w = writeFuncFromBuffer(buf)
+	p.writeFunc = writeFuncFromBuffer(buffer)
 }
 
 // SetContentType overrides the ContentType of the Part
-func (p *Part) SetContentType(c ContentType) {
+func (p *Part) SetContentType(contentType ContentType) {
-	p.ctype = c
+	p.contentType = contentType
 }
 
 // SetCharset overrides the Charset of the Part
-func (p *Part) SetCharset(c Charset) {
+func (p *Part) SetCharset(charset Charset) {
-	p.cset = c
+	p.charset = charset
 }
 
 // SetEncoding creates a new mime.WordEncoder based on the encoding setting of the message
-func (p *Part) SetEncoding(e Encoding) {
+func (p *Part) SetEncoding(encoding Encoding) {
-	p.enc = e
+	p.encoding = encoding
 }
 
 // SetDescription overrides the Content-Description of the Part
-func (p *Part) SetDescription(d string) {
+func (p *Part) SetDescription(description string) {
-	p.desc = d
+	p.description = description
 }
 
 // SetWriteFunc overrides the WriteFunc of the Part
-func (p *Part) SetWriteFunc(w func(io.Writer) (int64, error)) {
+func (p *Part) SetWriteFunc(writeFunc func(io.Writer) (int64, error)) {
-	p.w = w
+	p.writeFunc = writeFunc
 }
 
 // Delete removes the current part from the parts list of the Msg by setting the
-// del flag to true. The msgWriter will skip it then
+// isDeleted flag to true. The msgWriter will skip it then
 func (p *Part) Delete() {
-	p.del = true
+	p.isDeleted = true
 }
 
 // WithPartCharset overrides the default Part charset
-func WithPartCharset(c Charset) PartOption {
+func WithPartCharset(charset Charset) PartOption {
 	return func(p *Part) {
-		p.cset = c
+		p.charset = charset
 	}
 }
 
 // WithPartEncoding overrides the default Part encoding
-func WithPartEncoding(e Encoding) PartOption {
+func WithPartEncoding(encoding Encoding) PartOption {
 	return func(p *Part) {
-		p.enc = e
+		p.encoding = encoding
 	}
 }
 
 // WithPartContentDescription overrides the default Part Content-Description
-func WithPartContentDescription(d string) PartOption {
+func WithPartContentDescription(description string) PartOption {
 	return func(p *Part) {
-		p.desc = d
+		p.description = description
 	}
 }

part_test.go

@@ -31,15 +31,15 @@ func TestPartEncoding(t *testing.T) {
 				t.Errorf("newPart() WithPartEncoding() failed: no part returned")
 				return
 			}
-			if part.enc.String() != tt.want {
+			if part.encoding.String() != tt.want {
 				t.Errorf("newPart() WithPartEncoding() failed: expected encoding: %s, got: %s", tt.want,
-					part.enc.String())
+					part.encoding.String())
 			}
-			part.enc = ""
+			part.encoding = ""
 			part.SetEncoding(tt.enc)
-			if part.enc.String() != tt.want {
+			if part.encoding.String() != tt.want {
 				t.Errorf("newPart() SetEncoding() failed: expected encoding: %s, got: %s", tt.want,
-					part.enc.String())
+					part.encoding.String())
 			}
 		})
 	}
@@ -64,9 +64,9 @@ func TestWithPartCharset(t *testing.T) {
 				t.Errorf("newPart() WithPartCharset() failed: no part returned")
 				return
 			}
-			if part.cset.String() != tt.want {
+			if part.charset.String() != tt.want {
 				t.Errorf("newPart() WithPartCharset() failed: expected charset: %s, got: %s",
-					tt.want, part.cset.String())
+					tt.want, part.charset.String())
 			}
 		})
 	}
@@ -89,14 +89,14 @@ func TestPart_WithPartContentDescription(t *testing.T) {
 				t.Errorf("newPart() WithPartContentDescription() failed: no part returned")
 				return
 			}
-			if part.desc != tt.desc {
+			if part.description != tt.desc {
 				t.Errorf("newPart() WithPartContentDescription() failed: expected: %s, got: %s", tt.desc,
-					part.desc)
+					part.description)
 			}
-			part.desc = ""
+			part.description = ""
 			part.SetDescription(tt.desc)
-			if part.desc != tt.desc {
+			if part.description != tt.desc {
-				t.Errorf("newPart() SetDescription() failed: expected: %s, got: %s", tt.desc, part.desc)
+				t.Errorf("newPart() SetDescription() failed: expected: %s, got: %s", tt.desc, part.description)
 			}
 		})
 	}
@@ -236,7 +236,7 @@ func TestPart_GetContentBroken(t *testing.T) {
 		t.Errorf("failed: %s", err)
 		return
 	}
-	pl[0].w = func(io.Writer) (int64, error) {
+	pl[0].writeFunc = func(io.Writer) (int64, error) {
 		return 0, fmt.Errorf("broken")
 	}
 	_, err = pl[0].GetContent()
@@ -314,8 +314,8 @@ func TestPart_SetDescription(t *testing.T) {
 		t.Errorf("Part.GetDescription failed. Expected empty description but got: %s", pd)
 	}
 	pl[0].SetDescription(d)
-	if pl[0].desc != d {
+	if pl[0].description != d {
-		t.Errorf("Part.SetDescription failed. Expected desc to be: %s, got: %s", d, pd)
+		t.Errorf("Part.SetDescription failed. Expected description to be: %s, got: %s", d, pd)
 	}
 	pd = pl[0].GetDescription()
 	if pd != d {
@@ -334,8 +334,8 @@ func TestPart_Delete(t *testing.T) {
 		return
 	}
 	pl[0].Delete()
-	if !pl[0].del {
+	if !pl[0].isDeleted {
-		t.Errorf("Delete failed. Expected: %t, got: %t", true, pl[0].del)
+		t.Errorf("Delete failed. Expected: %t, got: %t", true, pl[0].isDeleted)
 	}
 }