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Showing content from https://github.com/mpickering/apply-refact below:

mpickering/apply-refact: Refactor Haskell source files

apply-refact applies refactorings specified by the refact package. It is currently integrated into HLint to enable the automatic application of suggestions.

• 0.15.x supports GHC 9.2 through 9.8, and 9.12. Unfortunately we are unable to support GHC 9.10.
• 0.14.x supports GHC 9.2 through 9.8.
• 0.13.x supports GHC 9.2 through 9.6.
• 0.12.x and 0.11.x support GHC 9.2 and 9.4.
• 0.10.x supports GHC 9.2.
• 0.9.x supports GHC 8.6 through 9.0.

cabal install apply-refact

Alternatively, clone the repo and run cabal install.

You can also install from Nix:

nix-env -iA nixpkgs.haskellPackages.apply-refact

Executable name is refactor.

hlint src/Main.hs --refactor --refactor-options="--inplace"

# test.hs

foo = (x)

# hlint.refact -- produced by hlint --serialise
[("test.hs:1:7: Warning: Redundant bracket\nFound:\n  (x)\nWhy not:\n
x\n",[Replace {rtype = Expr, pos = SrcSpan {startLine = 1, startCol = 7, endLine
= 1, endCol = 10}, subts = [("x",SrcSpan {startLine = 1, startCol = 8, endLine =
1, endCol = 9})], orig = "x"}])]

> refactor test.hs --refact-file hlint.refact
foo = x

One of either the input file or --refact-file must be specified on the command line. If an input file is specified but not --refact-file then refactor will accept refactorings from stdin and vice versa.

The -i option can be specified to perform the refactoring inplace overwriting the input file. This option is ignored when input is read from stdin.

The -s option can be specified to perform a stepwise evaluation of the refact file. The user is prompted whether to perform each hint before it is performed.

The --pos option is intended to be used by tooling in order to specify which specific hint should be performed.

Multiple -X options may be provided to specify additional default language pragmas which might affect parsing, such as -XLambdaCase or -XRankNTypes.

Refact files should be the result of show on a value of type [(String, [Refactoring SrcSpan])]. The string is a description of the refactoring, one description can have many associated refactoring steps.

The executable is provide so that libraries can use apply-refact without depending on the package. The implementation relies on ghc-exactprint which depends itself on GHC. A transitive dependancy that most developers wish to avoid!

If the program produces a syntactically incorrect result then this is a bug. Please open an issue on the issue tracker with precise instructions about how to reproduce it.

1. The input file
2. The refact file
3. The command used to invoke refactor

There are some known problems with CPP processing. If your library contains CPP directives other than #ifdef it is quite likely that the result will be unexpected.

There are also two hidden flags which can be useful for debugging.

Outputs the GHC AST.

Performs no refactoring operations on the file but is useful to test whether unexpected formatting is due to ghc-exactprint or the refactoring.

Contributions are welcome. You can run the tests via cabal test.

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