gsd-reapply-patches

Step 1: Detect backed-up patches

Check for local patches directory:

# Global install (path templated at install time)
PATCHES_DIR={{PLATFORM_ROOT}}/gsd-local-patches
# Local install fallback
if [ ! -d "$PATCHES_DIR" ]; then
  PATCHES_DIR={{PLATFORM_ROOT}}/gsd-local-patches
fi

Read backup-meta.json from the patches directory.

If no patches found:

No local patches found. Nothing to reapply.

Local patches are automatically saved when you run {{COMMAND_PREFIX}}update
after modifying any GSD workflow, command, or agent files.

Exit.

Step 2: Show patch summary

## Local Patches to Reapply

**Backed up from:** v{from_version}
**Current version:** {read VERSION file}
**Files modified:** {count}

| # | File | Status |
|---|------|--------|
| 1 | {file_path} | Pending |
| 2 | {file_path} | Pending |

Step 3: Merge each file

For each file in backup-meta.json:

1. Read the backed-up version (user's modified copy from gsd-local-patches/)

2. Read the newly installed version (current file after update)

3. Compare and merge:

   • If the new file is identical to the backed-up file: skip (modification was incorporated upstream)
   • If the new file differs: identify the user's modifications and apply them to the new version

   Merge strategy:

   • Read both versions fully
   • Identify sections the user added or modified (look for additions, not just differences from path replacement)
   • Apply user's additions/modifications to the new version
   • If a section the user modified was also changed upstream: flag as conflict, show both versions, ask user which to keep

4. Write merged result to the installed location

5. Report status:

   • Merged — user modifications applied cleanly
   • Skipped — modification already in upstream
   • Conflict — user chose resolution