build all flags upfront

Right now the only command is the build command and we have to parse the
flags either way (either for the help or for the build itself).

This simplifies the code a bit, because `-o` and `--output` will be
normalised.

Author: RobinMalfait

packages/@tailwindcss-cli/src/index.ts

@@ -9,8 +9,11 @@ const sharedOptions = {
   '--help': { type: 'boolean', description: 'Display usage information', alias: '-h' },
 } satisfies Arg
 
-const shared = args(sharedOptions)
-const command = shared._[0]
+const flags = args({
+  ...build.options(),
+  ...sharedOptions,
+})
+const command = flags._[0]
 
 // Right now we don't support any sub-commands. Let's show the help message
 // instead.
@@ -33,11 +36,7 @@ if (command) {
 //
 //   - `tailwindcss -o output.css`  // should run the build command, not show the help message
 //   - `tailwindcss > output.css`   // should run the build command, not show the help message
-if (
-  (process.stdout.isTTY &&
-    !process.argv.slice(2).some((flag) => flag === '-o' || flag === '--output')) ||
-  shared['--help']
-) {
+if ((process.stdout.isTTY && !flags['--output']) || flags['--help']) {
   help({
     usage: ['tailwindcss [--input input.css] [--output output.css] [--watch] [options…]'],
     options: { ...build.options(), ...sharedOptions },
@@ -46,4 +45,4 @@ if (
 }
 
 // Handle the build command
-build.handle(args(build.options()))
+build.handle(flags)