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modules/fs: Replace configure_file(copy:) with fs.copyfile
`configure_file` is both an extremely complicated implementation, and a strange place for copying. It's a bit of a historical artifact, since the fs module didn't yet exist. It makes more sense to move this to the fs module and deprecate this `configure_file` version. This new version works at build time rather than configure time, which has the disadvantage it can't be passed to `run_command`, but with the advantage that changes to the input don't require a full reconfigure.
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## `fs.copyfile` to replace `configure_file(copy : true)` | ||
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A new method has been added to the `fs` module, `copyfile`. This method replaces | ||
`configure_file(copy : true)`, but only copies files. Unlike `configure_file()` | ||
it runs at build time, and the output name is optional defaulting to the | ||
filename without paths of the input if unset: | ||
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```meson | ||
fs.copyfile('src/file.txt') | ||
``` | ||
Will create a file in the current build directory called `file.txt` | ||
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```meson | ||
fs.copyfile('file.txt', 'outfile.txt') | ||
``` | ||
Will create a copy renamed to `outfile.txt` |
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