fix: miro init to create shell wrapper

internal/miro/record_shell.go

@@ -0,0 +1,92 @@
+package miro
+
+import (
+	"bytes"
+	"embed"
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+	"text/template"
+)
+
+const recordShellName = "shell.sh"
+
+//go:embed record_shell.sh.tmpl
+var recordShellTemplateFS embed.FS
+
+var recordShellTemplate = template.Must(
+	template.New("record_shell.sh.tmpl").ParseFS(recordShellTemplateFS, "record_shell.sh.tmpl"),
+)
+
+func recordShellPath(testDir string) string {
+	return filepath.Join(testDir, recordShellName)
+}
+
+func writeRecordShell(testDir string) error {
+	if err := os.MkdirAll(testDir, 0o755); err != nil {
+		return fmt.Errorf("failed to create test directory %q: %v", testDir, err)
+	}
+
+	path := recordShellPath(testDir)
+	if err := os.WriteFile(path, []byte(buildRecordShellScript()), 0o644); err != nil {
+		return fmt.Errorf("failed to write recorder shell %q: %v", path, err)
+	}
+	if err := os.Chmod(path, 0o755); err != nil {
+		return fmt.Errorf("failed to make recorder shell executable %q: %v", path, err)
+	}
+
+	return nil
+}
+
+func resolveRecordShell(testDir string) (string, error) {
+	path := recordShellPath(testDir)
+	info, err := os.Stat(path)
+	if err != nil {
+		if errors.Is(err, os.ErrNotExist) {
+			return "", fmt.Errorf("missing recorder shell %q; rerun `miro init` or restore the file", path)
+		}
+		return "", fmt.Errorf("failed to check recorder shell %q: %v", path, err)
+	}
+	if info.IsDir() {
+		return "", fmt.Errorf("recorder shell %q is a directory; rerun `miro init` or restore the file", path)
+	}
+
+	return path, nil
+}
+
+func buildRecordShellScript() string {
+	var body bytes.Buffer
+	if err := recordShellTemplate.Execute(&body, struct {
+		VisibleHome string
+		VisibleRepo string
+		VisibleTmp  string
+		GitDate     string
+	}{
+		VisibleHome: shQuote(recordVisibleHome),
+		VisibleRepo: shQuote(recordVisibleRepo),
+		VisibleTmp:  shQuote(recordVisibleTmp),
+		GitDate:     shQuote(recordGitDate),
+	}); err != nil {
+		panic(fmt.Sprintf("render record shell template: %v", err))
+	}
+
+	return body.String()
+}
+
+func recordSessionEnv(sandbox recordSandbox) []string {
+	env := append([]string{}, os.Environ()...)
+	env = append(env,
+		"MIRO_RECORD_HOST_HOME="+sandbox.hostHome,
+		"MIRO_RECORD_HOST_TMP="+sandbox.hostTmp,
+		"MIRO_RECORD_PROJECT_ROOT="+sandbox.projectRoot,
+		"MIRO_RECORD_PATH_ENV="+sandbox.pathEnv,
+	)
+
+	return env
+}
+
+func shQuote(value string) string {
+	return "'" + strings.ReplaceAll(value, "'", `'"'"'`) + "'"
+}