Write to stdout when --output is omitted
#15656
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This is similar to `--input -`, where it reads the input from stdin. We will default to `-` so that it always prints to stdout when you omit the `-o` option.
When parsing `-o -`, it parses as `o: true` because mri thinks that `-` is the start of a new argument, _I think_. So to solve it, we pre process the options to convert `-` to a fallback value, then parse and then convert it back. I wish we could use a symbol, but mri will crash.
If you just run `npx @tailwindcss/cli`, then apart from `npx` and `@tailwindcss/cli`, no other arguments are passed. In this case, the help should show.
This is the equivalent of: ``` echo '...' | node ./my-command.js ```
- One test reads from stdin (added for completeness) - One test writes to stdout
philipp-spiess
approved these changes
Jan 17, 2025
Co-authored-by: Philipp Spiess <[email protected]>
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This PR fixes an issue with the
@tailwindcss/cli, where omitting the--outputflag should output tostdoutbut it didn't. This PR fixes that by writing tostdoutif no--outputis passed.That said, if nothing is passed, then the
--helpwill show.In summary:
stdin, use:--input -or-i -stdout, use:--output -or-o -or omit entirelyFixes: #15648
Test plan
Added integration tests to ensure that reading / writing to stdin / stdout works as expected.
Ran the updated CLI in my terminal to show that the
--helpshows by default, but if you use any arguments (like an--input) that the result is printed tostdoutas expected.Note the
twcommand is just a shorthand for runningbun --bun ~/github.com/tailwindlabs/tailwindcss/packages/@tailwindcss-cli/src/index.ts.