convert: fix --rules warning
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@ -86,7 +86,7 @@ convert opts = do
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usingStdin = csvfile == "-"
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rulesFileSpecified = isJust $ rules_file_ opts
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rulesfile = rulesFileFor opts csvfile
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when (usingStdin && (not rulesFileSpecified)) $ error' "please specify a files file when converting stdin"
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when (usingStdin && (not rulesFileSpecified)) $ error' "please use --rules to specify a rules file when converting stdin"
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csvparse <- parseCsv csvfile
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let records = case csvparse of
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Left e -> error' $ show e
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