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1.57.0

huggingface/smolagents1.57.0Jul 19, 2026by github-actions[bot]

AI Summary

This release introduces a new `len()` function and `else if` syntax support. It improves module handling by making environment variables visible to shell invocations and adds stricter validation rules for option names and argument patterns while fixing numerous bugs related to caching and error reporting.

Key Highlights

  • Added `len()` function for calculating string lengths.
  • Added `else if` syntax to the grammar.
  • Made `[env]` variables visible to `shell()` invocations.
  • Forbids option names beginning with `-`.
  • Fixed issues with module cycle detection and dotenv execution during dry runs.

Breaking Changes

  • Forbid duplicate groups.
  • Forbid option names beginning with `-`.
  • Reject empty alphabet in `choose()` regardless of count.
  • Forbid `[arg(flag)]` with `[arg(pattern)]`.
  • Don't accept option arguments starting with `-=` or `--=`.

New Features

  • Add `len()` function.
  • Add `else if` to grammar.
  • Accept markdown justfiles found by name.
  • Make `[env]` variables visible to `shell()` invocations.
  • Pass arguments to `cmd.exe` without escaping.

Full Release Notes

### Changed
- Pass arguments to `cmd.exe` without escaping ([#3636](https://github.com/casey/just/pull/3636) by [casey](https://github.com/casey))
- `split('')` splits into characters ([#3650](https://github.com/casey/just/pull/3650) by [casey](https://github.com/casey))
- Accept markdown justfiles found by name ([#3648](https://github.com/casey/just/pull/3648) by [casey](https://github.com/casey))
- Make `[env]` variables visible to `shell()` invocations ([#3631](https://github.com/casey/just/pull/3631) by [casey](https://github.com/casey))
- Forbid duplicate groups ([#3626](https://github.com/casey/just/pull/3626) by [casey](https://github.com/casey))
- Forbid option names beginning with `-` ([#3608](https://github.com/casey/just/pull/3608) by [casey](https://github.com/casey))
- Don't accept option arguments starting with `-=` or `--=` ([#3607](https://github.com/casey/just/pull/3607) by [casey](https://github.com/casey))
- Reject empty alphabet in `choose()` regardless of count ([#3605](https://github.com/casey/just/pull/3605) by [casey](https://github.com/casey))
- Forbid `[arg(flag)]` with `[arg(pattern)]` ([#3602](https://github.com/casey/just/pull/3602) by [casey](https://github.com/casey))
- Add extension to cache key ([#3600](https://github.com/casey/just/pull/3600) by [casey](https://github.com/casey))

### Fixed
- Don't reevaluate lazy assignments in user-defined functions ([#3654](https://github.com/casey/just/pull/3654) by [casey](https://github.com/casey))
- Don't print parenthesis around dependencies without arguments ([#3653](https://github.com/casey/just/pull/3653) by [casey](https://github.com/casey))
- Accept override paths containing module aliases ([#3652](https://github.com/casey/just/pull/3652) by [casey](https://github.com/casey))
- Fix line number in error message after multi-line interpolation ([#3646](https://github.com/casey/just/pull/3646) by [casey](https://github.com/casey))
- Don't execute dotenv commands during dry run ([#3644](https://github.com/casey/just/pull/3644) by [casey](https://github.com/casey))
- Only run `dotenv-command` in root module ([#3643](https://github.com/casey/just/pull/3643) by [casey](https://github.com/casey))
- Detect module cycle when path uses `..` ([#3641](https://github.com/casey/just/pull/3641) by [casey](https://github.com/casey))
- Recipes with `[arg(min)]` greater than zero cannot be default ([#3639](https://github.com/casey/just/pull/3639) by [casey](https://github.com/casey))
- Avoid panic in ambiguous module file error ([#3638](https://github.com/casey/just/pull/3638) by [casey](https://github.com/casey))
- Consider value when checking for setting conflicts ([#3627](https://github.com/casey/just/pull/3627) by [casey](https://github.com/casey))
- Ignore disabled indentation settings ([#3618](https://github.com/casey/just/pull/3618) by [casey](https://github.com/casey))
- Reject duplicate function parameters ([#3611](https://github.com/casey/just/pull/3611) by [casey](https://github.com/casey))
- Allow defaulted option before required positional parameter ([#3609](https://github.com/casey/just/pull/3609) by [casey](https://github.com/casey))
- Truncate cache entry before writing ([#3603](https://github.com/casey/just/pull/3603) by [casey](https://github.com/casey))
- Ignore absent optional modules under `--allow-missing` ([#3601](https://github.com/casey/just/pull/3601) by [casey](https://github.com/casey))

### Added
- Add `len()` function ([#3663](https://github.com/casey/just/pull/3663) by [casey](https://github.com/casey))
- Avoid panic when passed parentless justfile path ([#3624](https://github.com/casey/just/pull/3624) by [casey](https://github.com/casey))

### Misc
- Fix flags and options link in readme ([#3669](https://github.com/casey/just/pull/3669) by [casey](https://github.com/casey))
- Add `else if` to grammar ([#3667](https://github.com/casey/just/pull/3667) by [casey](https://github.com/casey))
- Remove function context macro ([#3659](https://github.com/casey/just/pull/3659) by [casey](https://github.com/casey))
- Remove on-demand assignment evaluation ([#3658](https://github.com/casey/just/pull/3658) by [casey](https://github.com/casey))
- Compute assignment references for `--evaluate` ([#3657](https://github.com/casey/just/pull/3657) by [casey](https://github.com/casey))
- Evaluate const assignments in evaluation order ([#3656](https://github.com/casey/just/pull/3656) by [casey](https://github.com/casey))
- Collect references transitively ([#3655](https://github.com/casey/just/pull/3655) by [casey](https://github.com/casey))
- Serialize dependency path in JSON ([#3651](https://github.com/casey/just/pull/3651) by [casey](https://github.com/casey))
- Print full recipe path for alias targets in `--show` and `--usage` ([#3649](https://github.com/casey/just/pull/3649) by [casey](https://github.com/casey))
- Reject unexpected arguments to `--completions` ([#3642](https://github.com/casey/just/pull/3642) by [casey](https://github.com/casey))
- Use recipe path in usage hint ([#3635](https://github.com/casey/just/pull/3635) by [casey](https://github.com/casey))
- Trim non-cycle prefix from circular variable dependency errors ([#3634](https://github.com/casey/just/pull/3634) by [casey](https://github.com/casey))
- Suggest similarly named submodules ([#3633](https://github.com/casey/just/pull/3633) by [casey](https://github.com/casey))
- Report disabled recipes and aliases in `--show` and `--usage` ([#3632](https://github.com/casey/just/pull/3632) by [casey](https://github.com/casey))
- Respect `--no-highlight` when echoing script recipes ([#3630](https://github.com/casey/just/pull/3630) by [casey](https://github.com/casey))
- Report undefined variables in order ([#3629](https://github.com/casey/just/pull/3629) by [casey](https://github.com/casey))
- Report correct final recipe in circular dependencies ([#3628](https://github.com/casey/just/pull/3628) by [casey](https://github.com/casey))
- Ignore files with module directory name ([#3625](https://github.com/casey/just/pull/3625) by [casey](https://github.com/casey))
- Dump unexports in alphabetical order ([#3623](https://github.com/casey/just/pull/3623) by [casey](https://github.com/casey))
- Reject extra arguments to `--groups` ([#3622](https://github.com/casey/just/pull/3622) by [casey](https://github.com/casey))
- Reject search-path-prefixes with `--global-justfile` ([#3621](https://github.com/casey/just/pull/3621) by [casey](https://github.com/casey))
- Refactor AST display ([#3620](https://github.com/casey/just/pull/3620) by [casey](https://github.com/casey))
- Format justfile with no items as empty string ([#3619](https://github.com/casey/just/pull/3619) by [casey](https://github.com/casey))
- Return search errors other than `NotFound` during fallback ([#3617](https://github.com/casey/just/pull/3617) by [casey](https://github.com/casey))
- Propagate more exit codes ([#3615](https://github.com/casey/just/pull/3615) by [casey](https://github.com/casey))
- Use interpreter file name to determine script shell kind ([#3614](https://github.com/casey/just/pull/3614) by [casey](https://github.com/casey))
- Resolve module aliases in `--evaluate` paths ([#3613](https://github.com/casey/just/pull/3613) by [casey](https://github.com/casey))
- Trim and ignore empty doc comments ([#3612](https://github.com/casey/just/pull/3612) by [casey](https://github.com/casey))
- Blame second recipe for duplicate `[default]` attribute ([#3610](https://github.com/casey/just/pull/3610) by [casey](https://github.com/casey))
- Visit modules in order in `--choose` ([#3606](https://github.com/casey/just/pull/3606) by [casey](https://github.com/casey))
- Include path in `canonicalize()` error message ([#3604](https://github.com/casey/just/pull/3604) by [casey](https://github.com/casey))
- Remove fuzzer ([#3599](https://github.com/casey/just/pull/3599) by [casey](https://github.com/casey))