auto-group-commit

Auto Group Commit

Analyze all working tree changes, group them into meaningful semantic commit units at hunk-level granularity, and commit them sequentially after user approval.

If $ARGUMENTS is provided, write all commit messages in that language (e.g., "japanese", "ja", "english", "en"). Default to English.

Steps

Step 1: Normalize working tree state

Ensure all changes are in an unstaged state for uniform analysis.

1. Run git diff --cached --quiet to check for staged changes
2. If there are staged changes, run git reset HEAD to unstage them (this is non-destructive — no work is lost)
3. Now all changes are either unstaged modifications or untracked files

This normalization is necessary because mixed staged/unstaged states complicate diff analysis and patch application.

Step 2: Gather all changes

Run the following commands in parallel:

1. git diff — full unified diff of all modifications
2. git diff --stat — change statistics summary
3. git status --short — list of all changed and untracked files

For each untracked file shown by git status (lines starting with ??), read its content. git diff does not include untracked files, so treat each untracked file as a "new file" addition.

If there are no changes at all (no modified, staged, or untracked files), notify the user and stop.

Step 3: Analyze and group changes into semantic commit units

Analyze all diffs and untracked file contents, then group them into logical commit units. Each group represents one commit.

Grouping guidelines

• Group by semantic purpose: a feature addition, a bug fix, a refactor, a config change, documentation, tests, etc.
• Hunk-level splitting: A single file's hunks CAN be split across different groups if they serve different purposes.
• Include untracked files: New files should be grouped with their related changes.
• Independent coherence: Each group must make sense as a standalone commit.
• Prefer smaller units: Favor more small, focused commits over fewer large ones.

For each group, record

• A descriptive list of included items:
  • Specific hunks identified by file path and the nature of the change
  • Entire untracked files
• A proposed commit message following conventional commit style or the repository's existing convention
• The commit order (groups should be ordered so that foundational changes come first)

Step 4: Present the grouping plan to the user

Display all groups in order using this format:

=== Commit 1/N ===
Message: <proposed commit message>

Changes:
  - <file path> (<brief description of included hunks>)
  - <file path> (new file)
  ...

=== Commit 2/N ===
Message: <proposed commit message>

Changes:
  - <file path> (<brief description of included hunks>)
  ...

Ask the user to approve the plan. If the user requests adjustments (reordering, merging groups, splitting further, changing messages), revise and re-present.

Do NOT proceed to Step 5 without explicit user approval.

Step 5: Execute commits sequentially

For each group in order:

Important: After each commit, HEAD changes and line numbers in the remaining diff may shift. Always work with the current diff state, not the original analysis. Re-read git diff <file> for each file to extract the correct hunks.

5a. Stage the changes for this group

For each item in the group:

• Entire file (all hunks belong to this group): Run git add <file>
• Untracked (new) file: Run git add <file>
• Specific hunks from a file:
  1. Run git diff <file> to get the current diff for the file
  2. Extract only the relevant hunks (matching by change content, not line numbers, since numbers may have shifted)
  3. Construct a valid unified diff patch containing only those hunks:
     • Include the diff --git a/<file> b/<file> header
     • Include the --- a/<file> and +++ b/<file> lines
     • Include the @@ ... @@ hunk header with correct line numbers from the current diff
     • Include the hunk content (context lines, additions, removals)
  4. See references/patch-format-example.md for a concrete example of a correctly constructed patch
  5. Write the patch to a temporary file (e.g., /tmp/auto-group-commit-N.patch)
  6. Apply to staging area: git apply --cached /tmp/auto-group-commit-N.patch

5b. Verify and commit

1. Run git diff --cached --stat to verify the staged content matches expectations
2. Commit with the approved message using HEREDOC format:

   git commit -m "$(cat <<'EOF'
   <commit message>
   EOF
   )"
   

3. Verify with git log -1 --oneline

5c. Clean up

• Remove temporary patch files: rm -f /tmp/auto-group-commit-N.patch
• Proceed to the next group

Step 6: Final verification

After all groups are committed:

1. Run git log --oneline -N (where N is the number of commit groups) to display all created commits
2. Run git status --short to confirm no unexpected changes remain

Report the results to the user.

Error Handling

• git apply --cached fails:

  1. Run git reset HEAD to clear the staging area
  2. Report the error to the user
  3. Ask whether to: retry with adjusted patch, skip this group, or abort remaining groups

• Commit fails (e.g., pre-commit hook):

  1. Run git reset HEAD to unstage
  2. Report the hook failure details to the user
  3. Ask whether to: fix the issue and retry, skip this group, or abort remaining groups

• Mid-sequence abort:

  • Already-committed groups are safely in git history
  • Remaining uncommitted changes stay in the working tree (unstaged)
  • No data is lost

Constraints

• Only analyze and group changes — do NOT push to the remote repository
• Do NOT create a pull request
• Always get user approval before executing any commits
• If no changes exist, notify the user and stop
• Clean up all temporary patch files after use
• Always use cat <<'EOF' (single-quoted) for HEREDOC commit messages to prevent variable expansion
• Never force-push or perform destructive git operations
• If binary files are present in the diff, stage them with git add <file> rather than attempting patch construction