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Document how we obtain the name of the cabal config file. #63

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Jan 18, 2024
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Document how we obtain the name of the cabal config file. #63

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9 changes: 9 additions & 0 deletions dist/index.js
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9 changes: 9 additions & 0 deletions lib/setup-haskell.js
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9 changes: 9 additions & 0 deletions src/setup-haskell.ts
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Expand Up @@ -16,6 +16,15 @@ async function cabalConfig(): Promise<string> {
silent: true,
listeners: {stdout: append, stderr: append}
});
// The last line of the cabal help text is printing the config file, e.g.:
//
// > You can edit the cabal configuration file to set defaults:
// > <<HOME>>/.cabal/config
//
// So trimming the last line will give us the name of the config file.
//
// Needless to say this is very brittle, but we secure this by a test
// in Cabal's testsuite: https://github.com/haskell/cabal/pull/9614
return out.toString().trim().split('\n').slice(-1)[0].trim();
}

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