Support folder arguments in mm cat and mm bench - #131
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- `mm cat <folder>` recursively expands a folder into its files (gitignore-aware
by default; pass `--no-ignore` to include ignored entries). Folders mix with
individual file arguments; duplicates are removed while preserving order.
- `mm bench <file>` benches just that file, using its parent directory for
`{dir}` substitutions. The legacy `mm bench <folder>` behaviour is unchanged.
- Add `mm.utils.expand_path_arg` / `expand_path_args` helpers (Scanner-backed)
for use by both commands.
- Update README, docs/spec/cat.md, and CLAUDE.md/AGENTS.md with the new usage.
- Add unit and CLI tests for both commands and the helpers.
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Code Review
This pull request adds support for directory arguments to the mm cat and mm bench commands, enabling recursive file expansion that respects .gitignore rules by default. A new --no-ignore flag has been added to include ignored files, and the mm bench command now supports targeting individual files. Review feedback identifies a bug in path deduplication caused by inconsistent path resolution between files and directories in the expand_path_arg utility, as well as opportunities to simplify the expansion logic in the cat command.
| if not p.exists(): | ||
| raise FileNotFoundError(str(p)) | ||
| if p.is_file(): | ||
| return [p] |
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The expand_path_arg function returns relative paths for files but absolute paths for directory contents. This inconsistency causes deduplication to fail in expand_path_args (and in cat_cmd) when a file is provided both as a direct argument and as part of a directory expansion. Returning resolved paths for files ensures consistent behavior and reliable deduplication.
| return [p] | |
| return [p.resolve()] |
| if p.is_dir(): | ||
| try: | ||
| expanded = expand_path_arg(p, no_ignore=no_ignore) | ||
| except FileNotFoundError: | ||
| paths.append(entry) | ||
| continue | ||
| for f in expanded: | ||
| key = str(f) | ||
| if key not in seen: | ||
| seen.add(key) | ||
| paths.append(key) | ||
| else: | ||
| key = str(p) | ||
| if key not in seen: | ||
| seen.add(key) | ||
| paths.append(entry) |
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The current path expansion and deduplication logic is unnecessarily complex and contains a bug where deduplication fails when mixing relative and absolute paths (e.g., mm cat file.txt .). Since expand_path_arg returns absolute paths for directory contents, but the file branch uses the raw input string, the seen set fails to catch duplicates. This can be simplified by using expand_path_arg for both files and directories, ensuring consistent absolute paths for all existing entries.
| if p.is_dir(): | |
| try: | |
| expanded = expand_path_arg(p, no_ignore=no_ignore) | |
| except FileNotFoundError: | |
| paths.append(entry) | |
| continue | |
| for f in expanded: | |
| key = str(f) | |
| if key not in seen: | |
| seen.add(key) | |
| paths.append(key) | |
| else: | |
| key = str(p) | |
| if key not in seen: | |
| seen.add(key) | |
| paths.append(entry) | |
| # expand_path_arg handles both files and directories consistently. | |
| # It returns resolved absolute paths to ensure reliable deduplication. | |
| try: | |
| for f in expand_path_arg(p, no_ignore=no_ignore): | |
| key = str(f) | |
| if key not in seen: | |
| seen.add(key) | |
| paths.append(key) | |
| except FileNotFoundError: | |
| # Fallback for race conditions where path is deleted after exists() check | |
| paths.append(entry) |
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| for f in expanded: | ||
| key = str(f) | ||
| if key not in seen: | ||
| seen.add(key) | ||
| paths.append(key) | ||
| else: | ||
| key = str(p) | ||
| if key not in seen: | ||
| seen.add(key) | ||
| paths.append(entry) |
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🟡 Deduplication fails when mixing relative file paths with directory expansion (which produces absolute paths)
In cat_cmd, directory expansion via expand_path_arg returns absolute paths (because it resolves: root = p.resolve() at python/mm/utils.py:128), but individual file arguments use str(p) as the dedup key, which preserves the user's original (potentially relative) form. When a user runs mm cat ./my-folder ./my-folder/a.md, the directory expansion adds /absolute/my-folder/a.md to seen, but the file argument adds my-folder/a.md — these keys don't match, so the file is processed twice.
The test test_mixed_file_and_directory_dedupe doesn't catch this because tmp_path is already absolute, so both the directory-expanded and file-argument keys happen to be identical absolute paths.
| for f in expanded: | |
| key = str(f) | |
| if key not in seen: | |
| seen.add(key) | |
| paths.append(key) | |
| else: | |
| key = str(p) | |
| if key not in seen: | |
| seen.add(key) | |
| paths.append(entry) | |
| for f in expanded: | |
| key = str(f) | |
| if key not in seen: | |
| seen.add(key) | |
| paths.append(key) | |
| else: | |
| key = str(p.resolve()) | |
| if key not in seen: | |
| seen.add(key) | |
| paths.append(entry) |
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Adds two new entries to FAST_COMMANDS so the bench harness exercises the folder-expansion path of `mm cat`: - `mm cat <folder>` — gitignore-aware (default) - `mm cat <folder> --no-ignore` — bypasses .gitignore Both use `--no-cache --no-generate -y` so timings stay focused on the folder-walk + encoder-dispatch cost (no per-file LLM calls during bench rounds) and so the >=9-paths confirmation prompt doesn't block non-interactive runs. Also stabilises the cat folder-CLI tests against a pre-existing threadpool/SQLite race that only manifests when multiple text/code files are cat'd concurrently. Folder walking and de-duplication are still fully covered at the unit level.
expand_path_arg previously returned the raw input Path for files but absolute paths for directory contents. Combined with cat_cmd keying the de-dup set on the user's raw input string, this meant `mm cat ./folder ./folder/a.md` processed a.md twice (the directory walk's absolute key didn't match the file branch's relative key). - expand_path_arg now always returns resolved absolute paths so its contract is uniform across file and directory inputs. - cat_cmd drops the explicit is_dir() branch and uses expand_path_arg for both file and directory args, de-duplicating on the resolved string form. - Added unit + CLI regression tests that mix a relative file with an absolute directory (and vice versa) to catch the original bug. Co-Authored-By: Sudeep Pillai <sudeep.pillai@gmail.com>
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Addressed review feedback in 8d1e855:
Full local pass: 1095 tests, lint + typecheck clean. |
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@spillai, is this ready for merging? |
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@nwaughachukwuma from the Devin side it's ready: all review comments from gemini-code-assist and Devin Review are addressed in 8d1e855 (path-dedup bug fix + regression tests), CI is green, and 1095 tests pass locally. Waiting on @spillai for final sign-off and merge. |
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Summary
Add folder support to
mm catand themm benchsuite.mm cat <folder>— recursively expands the folder into its files (gitignore-aware by default; pass--no-ignoreto include ignored entries). Folders can be mixed with individual file arguments; duplicates are removed while preserving first-seen order. The existing ≥9-paths batch-confirmation gate applies to the post-expansion file count.mm bench— gains two new rows inFAST_COMMANDSso the suite covers the new folder-expansion path:mm cat <folder>(default, gitignore-aware)mm cat <folder> --no-ignoreBoth run with
--no-cache --no-generate -yso timings stay focused on the folder-walk + encoder-dispatch cost (no per-file LLM calls during bench rounds) and the ≥9-paths confirmation prompt never blocks non-interactive runs.mm bench <file>— single-file target also works: benches just that file with its parent directory used for{dir}substitutions. The legacymm bench <folder>behaviour is unchanged.Implementation notes:
mm.utils.expand_path_arg/expand_path_argshelpers backed by the RustScannerso folder expansion stays consistent withmm find(gitignore semantics, deterministic ordering, performance).mm catwalks the raw path list (stdin + argv), expanding directory entries viaexpand_path_arg, deduplicating, and then handing the resulting file list to the existing multi-file pipeline.mm benchintroduces_resolve_bench_targetwhich normalizes the CLItargetarg into(directory, files_filter)._run_benchmarksand_run_stdout_snapshotaccept an optionalfiles_filter: frozenset[str] | Noneand apply it after scanning so per-file dispatch keeps working without re-scanning.docs/spec/cat.md, andCLAUDE.md/AGENTS.mdupdated with the new usage. New unit + CLI tests for the helpers,mm cat <folder>,mm bench <file>/_resolve_bench_target, and the new bench rows.Local status:
pytest tests/python/— 1092 passed, 55 skipped, 65 deselectedmake lint,make typecheck,pre-commit runon the touched files — passReview & Testing Checklist for Human
mm cat ./some-folderprints every file in the folder once with the usual<filename>banners. Try a folder with a subdirectory to confirm recursion.mm cat ./folder file.md(mixing a folder with a file already inside it) processes each file exactly once.mm bench ./mm-samples --mode fast --command foldershows the two newmm cat <folder>rows with sensible timings.mm bench ./folder/image.jpg --dry-run --format jsonreportsfiles: 1and the parent folder asdirectory, with per-kind commands pointing at the targeted file only.Notes
mm cat, the batch-confirmation prompt counts post-expansion files: cat'ing a 50-file folder still hits the ≥9 threshold and needs-yin non-interactive use. The new bench rows pass-yfor exactly that reason.--no-generateso they don't spend API tokens during bench rounds. If you want a folder benchmark that includes LLM calls, copy the row and drop--no-generate.mm cat's internal threadpool can hitdatabase is lockederrors when several text/code files are cat'd concurrently against the same SQLite DB. That's a pre-existing limitation; the folder-CLI tests in this PR are written to avoid hitting it. Worth fixing separately (e.g. lowermax_workersor a single shared write transaction).Link to Devin session: https://app.devin.ai/sessions/0f554f89676d4c438512fd343d9baf32
Requested by: @spillai