Replace encoder API with ini builder

ini.go

@@ -4,10 +4,14 @@ import (
 	"bufio"
 	"fmt"
 	"io"
-	"reflect"
 	"strings"
 )
 
+// State machine for writing to streamable INI file sources.
+type Builder struct {
+	writer *bufio.Writer
+}
+
 // Singular key-value pair under the given section within an INI file.
 type Entry struct {
 	Section string
@@ -15,32 +19,6 @@ type Entry struct {
 	Value   string
 }
 
-// Attempts to write `value` to `writer` in an INI-encoded format, returning any error that
-// occured during writing.
-func Encode(writer io.Writer, section string, value any) error {
-	if _, printError := fmt.Fprintf(writer, "[%s]\n", section); printError != nil {
-		return printError
-	}
-
-	var valueType = reflect.TypeOf(value)
-
-	if valueType.Kind() != reflect.Struct {
-		return fmt.Errorf("only structs may be encoded")
-	}
-
-	var valueInfo = reflect.ValueOf(value)
-
-	for i := 0; i < valueInfo.NumField(); i += 1 {
-		if _, printError := fmt.Fprintf(writer, "%s = %s\n",
-			valueType.Field(i).Name, valueInfo.Field(i).Interface()); printError != nil {
-
-			return printError
-		}
-	}
-
-	return nil
-}
-
 // Returns the last error that occured during parsing.
 func (parser *Parser) Err() error {
 	return parser.err
@@ -52,7 +30,21 @@ func (parser *Parser) IsEnd() bool {
 	return parser.isEnd
 }
 
-// Creates and returns a new [Parser] by reference from `reader`
+// Appends a new key-value pair of `key` and `value` respectively in the `builder`.
+func (builder *Builder) KeyValue(key string, value string) error {
+	var _, printError = fmt.Fprintf(builder.writer, "%s = %s\n", key, value)
+
+	return printError
+}
+
+// Creates and returns a new [Builder] by reference from `writer`.
+func NewBuilder(writer io.Writer) *Builder {
+	return &Builder{
+		writer: bufio.NewWriter(writer),
+	}
+}
+
+// Creates and returns a new [Parser] by reference from `reader`.
 func NewParser(reader io.Reader) *Parser {
 	return &Parser{
 		scanner: bufio.NewScanner(reader),
@@ -123,6 +115,13 @@ type Parser struct {
 	isEnd   bool
 }
 
+// Appends a new section titled `name` in the `builder`.
+func (builder *Builder) Section(name string) error {
+	var _, printError = fmt.Fprintf(builder.writer, "[%s]\n", name)
+
+	return printError
+}
+
 // Returns a string with the the outer-most quotes surrounding `s` trimmed, should they exist.
 func unquote(s string) string {
 	var sLen = len(s)