Agent not work yet. Need to build Part B first

clitools/pkg/cmd/helpers.go

@@ -0,0 +1,57 @@
+package cmd
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strings"
+)
+
+func LoadEnvFile(path string) error {
+	f, err := os.Open(path)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	scanner := bufio.NewScanner(f)
+	lineNum := 0
+
+	for scanner.Scan() {
+		lineNum++
+		line := strings.TrimSpace(scanner.Text())
+
+		if line == "" || strings.HasPrefix(line, "#") {
+			continue
+		}
+
+		key, val, ok := strings.Cut(line, "=")
+		if !ok {
+			return fmt.Errorf("line %d: expected KEY=VALUE", lineNum)
+		}
+
+		key = strings.TrimSpace(key)
+		val = strings.TrimSpace(val)
+
+		if key == "" {
+			return fmt.Errorf("line %d: empty variable name", lineNum)
+		}
+
+		// Remove matching single or double quotes around the whole value.
+		if len(val) >= 2 {
+			if (val[0] == '"' && val[len(val)-1] == '"') || (val[0] == '\'' && val[len(val)-1] == '\'') {
+				val = val[1 : len(val)-1]
+			}
+		}
+
+		if err := os.Setenv(key, val); err != nil {
+			return fmt.Errorf("line %d: set %q: %w", lineNum, key, err)
+		}
+	}
+
+	if err := scanner.Err(); err != nil {
+		return err
+	}
+
+	return nil
+}