Super basic NIP file parser

pkg/nip/file_reader.go

@@ -0,0 +1,58 @@
+package pickit
+
+import (
+	"bufio"
+	"errors"
+	"fmt"
+	"os"
+	"strings"
+)
+
+func ReadDir(path string) ([]Rule, error) {
+	files, err := os.ReadDir(path)
+	if err != nil {
+		return nil, err
+	}
+
+	rules := make([]Rule, 0)
+	for _, file := range files {
+		if !strings.HasSuffix(strings.ToLower(file.Name()), ".nip") || file.IsDir() {
+			continue
+		}
+
+		newRules, err := ParseNIPFile(path + file.Name())
+		if err != nil {
+			return nil, err
+		}
+
+		rules = append(rules, newRules...)
+	}
+
+	return rules, nil
+}
+
+func ParseNIPFile(filePath string) ([]Rule, error) {
+	fileReader, err := os.Open(filePath)
+	if err != nil {
+		return nil, err
+	}
+	defer fileReader.Close()
+
+	fileScanner := bufio.NewScanner(fileReader)
+	fileScanner.Split(bufio.ScanLines)
+
+	rules := make([]Rule, 0)
+	for fileScanner.Scan() {
+		rule, err := parseLine(fileScanner.Text())
+		if errors.Is(err, errEmptyLine) {
+			continue
+		}
+		if err != nil {
+			return nil, fmt.Errorf("error reading file: %w", err)
+		}
+
+		rules = append(rules, rule)
+	}
+
+	return rules, nil
+}