feat: add output flag #13

mvhutz · 2026-01-11T22:13:03Z

mvhutz commented

2026-01-11 22:13:03 +00:00

Description

The lambda CLI previously only wrote output to stdout using shell redirection.
This PR adds support for writing results to files using the -o flag.
This is implemented using a new Destination interface that mirrors the existing Source pattern.

Changes:

Added Destination interface with StdoutDestination and FileDestination implementations.
Added -o flag to CLI argument parser for output file specification.
Updated Config to use Destination instead of direct output handling.
Refactored main to use Destination.Write() for result output.
Updated Makefile targets (run, profile, explain) to use -o flag instead of shell redirection.

Decisions

The -o flag defaults to stdout when not specified or when set to -.
This maintains backward compatibility while providing explicit file output capability.

Benefits

Cleaner command-line interface without shell redirection.
Symmetric design with Source interface for input.
More portable across different shells and environments.
Explicit output handling improves code clarity.

Checklist

Code follows conventional commit format.
Branch follows naming convention (<type>/<description>).
Tests pass (if applicable).
Documentation updated (if applicable).

## Description The lambda CLI previously only wrote output to stdout using shell redirection. This PR adds support for writing results to files using the `-o` flag. This is implemented using a new `Destination` interface that mirrors the existing `Source` pattern. Changes: - Added `Destination` interface with `StdoutDestination` and `FileDestination` implementations. - Added `-o` flag to CLI argument parser for output file specification. - Updated `Config` to use `Destination` instead of direct output handling. - Refactored main to use `Destination.Write()` for result output. - Updated Makefile targets (`run`, `profile`, `explain`) to use `-o` flag instead of shell redirection. ### Decisions The `-o` flag defaults to stdout when not specified or when set to `-`. This maintains backward compatibility while providing explicit file output capability. ## Benefits - Cleaner command-line interface without shell redirection. - Symmetric design with `Source` interface for input. - More portable across different shells and environments. - Explicit output handling improves code clarity. ## Checklist - [x] Code follows conventional commit format. - [x] Branch follows naming convention (`<type>/<description>`). - [ ] Tests pass (if applicable). - [ ] Documentation updated (if applicable).

mvhutz added 2 commits 2026-01-11 22:13:03 +00:00

feat: add output flag with Destination interface. 9bd75cf409

Added -o flag to write results to files using a new Destination interface.

Changes:
- Add Destination interface with StdoutDestination and FileDestination implementations.
- Add -o flag to CLI parser for output file specification.
- Update Config to use Destination instead of direct output handling.
- Refactor main to use Destination.Write() for result output.

refactor: use -o flag in Makefile targets. 309748e3cb

mvhutz merged commit 0eff85f8fa into main

2026-01-11 22:14:49 +00:00

mvhutz deleted branch feat/output-flag

2026-01-11 22:14:49 +00:00

mvhutz referenced this issue from a commit

2026-01-11 22:14:51 +00:00

feat: add output flag (#13)

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Reference: mvhutz/lambda#13