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;csv: refactor transactionFromCsvRecord, extract those helpers

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Simon Michael 2020-02-27 11:19:37 -08:00
parent 6f08eed719
commit f2767477ab
1 changed files with 30 additions and 25 deletions
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55
hledger-lib/Hledger/Read/CsvReader.hs
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@ -742,35 +742,40 @@ type CsvRecord = [String]
showRules rules record =
unlines $ catMaybes [ (("the "++fld++" rule is: ")++) <$> getEffectiveAssignment rules record fld | fld <- journalfieldnames]
-- | Look up the value (template) of a csv rule by rule keyword.
csvRule :: CsvRules -> DirectiveName -> Maybe FieldTemplate
csvRule rules = (`getDirective` rules)
-- | Look up the final value assigned to a csv rule by rule keyword, taking
-- into account the current record and conditional rules.
-- Generally rules with keywords ("directives") don't have interpolated
-- values, but for now it's possible.
csvRuleValue :: CsvRules -> CsvRecord -> DirectiveName -> Maybe String
csvRuleValue rules record = fmap (renderTemplate rules record) . csvRule rules
-- | Look up the value template assigned to a hledger field by field
-- list/field assignment rules, taking into account the current record and
-- conditional rules.
hledgerField :: CsvRules -> CsvRecord -> HledgerFieldName -> Maybe FieldTemplate
hledgerField = getEffectiveAssignment
-- | Look up the final value assigned to a hledger field, with csv field
-- references interpolated.
hledgerFieldValue :: CsvRules -> CsvRecord -> HledgerFieldName -> Maybe String
hledgerFieldValue rules record = fmap (renderTemplate rules record) . hledgerField rules record
s `withDefault` def = if null s then def else s
-- warning: 200 line beast ahead
transactionFromCsvRecord :: SourcePos -> CsvRules -> CsvRecord -> Transaction
transactionFromCsvRecord sourcepos rules record = t
where
----------------------------------------------------------------------
-- 1. Some helpers
-- Look up the value (template) of a csv rule by rule keyword.
rule :: DirectiveName -> Maybe FieldTemplate
rule = (`getDirective` rules)
-- Look up the final value assigned to a csv rule by rule keyword.
-- Generally rules with keywords don't have interpolated values,
-- but for now it's possible. Cf default-account below.
ruleval :: DirectiveName -> Maybe String
ruleval = fmap (renderTemplate rules record) . field
-- Look up the value template assigned to a hledger field by field
-- list/field assignment rules, taking into account the current record and
-- conditional rules.
field :: HledgerFieldName -> Maybe FieldTemplate
field = getEffectiveAssignment rules record
-- Look up the final value assigned to a hledger field, with csv field
-- references interpolated.
fieldval :: HledgerFieldName -> Maybe String
fieldval = fmap (renderTemplate rules record) . field
s `or` def = if null s then def else s
rule = csvRule rules :: DirectiveName -> Maybe FieldTemplate
ruleval = csvRuleValue rules record :: DirectiveName -> Maybe String
field = hledgerField rules record :: HledgerFieldName -> Maybe FieldTemplate
fieldval = hledgerFieldValue rules record :: HledgerFieldName -> Maybe String
----------------------------------------------------------------------
-- 2. Gather the values needed for the transaction itself, by evaluating
@ -826,7 +831,7 @@ transactionFromCsvRecord sourcepos rules record = t
mkPosting number accountFld amountFld amountInFld amountOutFld balanceFld commentFld =
let mdefaultcurrency = rule "default-currency"
currency = fromMaybe (fromMaybe "" mdefaultcurrency) $
fieldval ("currency"++number) `or` fieldval "currency"
fieldval ("currency"++number) `withDefault` fieldval "currency"
mamount = chooseAmount rules record currency amountFld amountInFld amountOutFld
mbalance :: Maybe (Amount, GenericSourcePos) =
fieldval balanceFld >>= parsebalance currency number
@ -851,7 +856,7 @@ transactionFromCsvRecord sourcepos rules record = t
maccount = T.pack <$> (fieldval accountFld
-- XXX what's this needed for ? Test & document, or drop.
-- Also, this the only place we interpolate in a keyword rule, I think.
`or` ruleval ("default-account" ++ number))
`withDefault` ruleval ("default-account" ++ number))
-- figure out the account name to use for this posting, if any, and
-- whether it is the default unknown account, which may be improved
-- later, or an explicitly set account, which may not.