fix(generate): reject non-empty output directory without --force

862dfa705efaa7a0375a1de943132be580cbfca1 · 2026-03-27 13:32:36 -0700 · Trevin Chow

Prevents silent file overwrites when running generate twice on the same
output directory. Empty pre-existing directories are still allowed.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Files touched

M internal/cli/root.go

Diff

commit 862dfa705efaa7a0375a1de943132be580cbfca1
Author: Trevin Chow <trevin@trevinchow.com>
Date:   Fri Mar 27 13:32:36 2026 -0700

    fix(generate): reject non-empty output directory without --force
    
    Prevents silent file overwrites when running generate twice on the same
    output directory. Empty pre-existing directories are still allowed.
    
    Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
---
 internal/cli/root.go | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/internal/cli/root.go b/internal/cli/root.go
index 68b169d8..10517d6b 100644
--- a/internal/cli/root.go
+++ b/internal/cli/root.go
@@ -103,6 +103,11 @@ func newGenerateCmd() *cobra.Command {
 					if err := os.RemoveAll(absOut); err != nil {
 						return fmt.Errorf("removing existing output dir: %w", err)
 					}
+				} else if info, err := os.Stat(absOut); err == nil && info.IsDir() {
+					entries, _ := os.ReadDir(absOut)
+					if len(entries) > 0 {
+						return fmt.Errorf("output directory %s already exists (use --force to overwrite)", absOut)
+					}
 				}
 
 				gen := generator.New(parsed, absOut)
@@ -187,6 +192,11 @@ func newGenerateCmd() *cobra.Command {
 				if err := os.RemoveAll(absOut); err != nil {
 					return fmt.Errorf("removing existing output dir: %w", err)
 				}
+			} else if info, err := os.Stat(absOut); err == nil && info.IsDir() {
+				entries, _ := os.ReadDir(absOut)
+				if len(entries) > 0 {
+					return fmt.Errorf("output directory %s already exists (use --force to overwrite)", absOut)
+				}
 			}
 
 			gen := generator.New(apiSpec, absOut)

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