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Decouple ParseAndRun to allow customization of Invocation #442

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Decouple ParseAndRun to allow customization of Invocation #442

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@cardil cardil commented Sep 16, 2022 •
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Fixes #445

I'm introducing two functions Run and HandleParseError which allow users to customize the Invocation after it is parsed.

For example:

inv, cmd, err := Parse(stderr, stdout, args)
if retcode, doExit := HandleParseError(err, stderr); doExit {
  return retcode
}
inv.Stdin = stdin

# example customization
inv.WorkDir = ".." 
inv.Dir = "."

return Run(inv, cmd)

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Enhancement: Allow to customize mage's Main func
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