Add insert command

internal/insert/request.go

@@ -0,0 +1,86 @@
+package insert
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"time"
+
+	"github.com/rogeecn/renamer/internal/listing"
+)
+
+// Request encapsulates the inputs required to run an insert operation.
+type Request struct {
+	WorkingDir      string
+	PositionToken   string
+	InsertText      string
+	IncludeDirs     bool
+	Recursive       bool
+	IncludeHidden   bool
+	ExtensionFilter []string
+	DryRun          bool
+	AutoConfirm     bool
+	Timestamp       time.Time
+}
+
+// NewRequest constructs a Request from shared listing scope.
+func NewRequest(scope *listing.ListingRequest) *Request {
+	if scope == nil {
+		return &Request{}
+	}
+
+	extensions := append([]string(nil), scope.Extensions...)
+
+	return &Request{
+		WorkingDir:      scope.WorkingDir,
+		IncludeDirs:     scope.IncludeDirectories,
+		Recursive:       scope.Recursive,
+		IncludeHidden:   scope.IncludeHidden,
+		ExtensionFilter: extensions,
+	}
+}
+
+// SetExecutionMode updates dry-run and auto-apply preferences.
+func (r *Request) SetExecutionMode(dryRun, autoConfirm bool) {
+	r.DryRun = dryRun
+	r.AutoConfirm = autoConfirm
+}
+
+// SetPositionAndText stores the user-supplied position token and insert text.
+func (r *Request) SetPositionAndText(positionToken, insertText string) {
+	r.PositionToken = positionToken
+	r.InsertText = insertText
+}
+
+// Normalize ensures working directory and timestamp fields are ready for execution.
+func (r *Request) Normalize() error {
+	if r.WorkingDir == "" {
+		cwd, err := os.Getwd()
+		if err != nil {
+			return fmt.Errorf("determine working directory: %w", err)
+		}
+		r.WorkingDir = cwd
+	}
+
+	if !filepath.IsAbs(r.WorkingDir) {
+		abs, err := filepath.Abs(r.WorkingDir)
+		if err != nil {
+			return fmt.Errorf("resolve working directory: %w", err)
+		}
+		r.WorkingDir = abs
+	}
+
+	info, err := os.Stat(r.WorkingDir)
+	if err != nil {
+		return fmt.Errorf("stat working directory: %w", err)
+	}
+	if !info.IsDir() {
+		return fmt.Errorf("working directory %q is not a directory", r.WorkingDir)
+	}
+
+	if r.Timestamp.IsZero() {
+		r.Timestamp = time.Now().UTC()
+	}
+
+	return nil
+}