feat: add file input flag #12

mvhutz · 2026-01-11T21:41:04Z

mvhutz commented

2026-01-11 21:41:04 +00:00

Description

The lambda CLI previously only supported inline string expressions and stdin input.
This PR adds support for reading lambda expressions from files using the -f flag.
This makes it easier to work with larger programs stored in files.

Changes:

Added FileSource type to internal/config/source.go for reading from file paths.
Added -f flag to CLI argument parser with validation to prevent conflicting inputs.
Updated Makefile targets (run, profile, explain) to use -f flag instead of stdin redirection.

Decisions

The -f flag takes precedence over positional arguments.
If both are specified, an error is returned to avoid ambiguity.

Benefits

More intuitive workflow for file-based lambda programs.
Cleaner Makefile targets without stdin redirection.
Consistent with common CLI conventions (e.g., grep -f, awk -f).

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 supported inline string expressions and stdin input. This PR adds support for reading lambda expressions from files using the `-f` flag. This makes it easier to work with larger programs stored in files. Changes: - Added `FileSource` type to `internal/config/source.go` for reading from file paths. - Added `-f` flag to CLI argument parser with validation to prevent conflicting inputs. - Updated Makefile targets (`run`, `profile`, `explain`) to use `-f` flag instead of stdin redirection. ### Decisions The `-f` flag takes precedence over positional arguments. If both are specified, an error is returned to avoid ambiguity. ## Benefits - More intuitive workflow for file-based lambda programs. - Cleaner Makefile targets without stdin redirection. - Consistent with common CLI conventions (e.g., `grep -f`, `awk -f`). ## 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 21:41:05 +00:00

feat: add file input flag to CLI. 82e1570c2c

Added -f flag to allow reading lambda expressions from files.

Changes:
- Add FileSource type to read from file paths.
- Add -f flag to command-line parser.
- Implement validation to prevent conflicting -f and positional arguments.

refactor: use -f flag in Makefile targets. 9ab004bec4

mvhutz merged commit 62699a0e37 into main

2026-01-11 21:43:12 +00:00

mvhutz deleted branch feat/file-input-flag

2026-01-11 21:43:12 +00:00

mvhutz referenced this issue from a commit

2026-01-11 21:43:13 +00:00

feat: add file input flag (#12)

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Reference: mvhutz/lambda#12