feat(hook): expand environment variables.

hook/hook.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"os"
 	"os/exec"
 	"strings"
 	"time"
@@ -27,7 +28,7 @@ func execute(command string) error {
 	ctxCmd, cancel := context.WithTimeout(context.Background(), 30*time.Second)
 	defer cancel()
 
-	parts := strings.Fields(command)
+	parts := strings.Fields(os.ExpandEnv(command))
 	output, err := exec.CommandContext(ctxCmd, parts[0], parts[1:]...).CombinedOutput()
 	if len(output) > 0 {
 		fmt.Println(string(output))

hook/hook_test.go

@@ -0,0 +1,29 @@
+package hook
+
+import "testing"
+
+func Test_execute(t *testing.T) {
+	testCases := []struct {
+		desc    string
+		command string
+	}{
+		{
+			desc:    "expand env vars",
+			command: `echo "${GOPATH} ${GOARCH}"`,
+		},
+		{
+			desc:    "simple",
+			command: `echo 'hello'`,
+		},
+	}
+
+	for _, test := range testCases {
+		t.Run(test.desc, func(t *testing.T) {
+
+			err := execute(test.command)
+			if err != nil {
+				t.Fatal(err)
+			}
+		})
+	}
+}