hledger-lib-0.9: Core types and utilities for working with hledger (or c++ ledger) data.



Date parsing and utilities for hledger.

For date and time values, we use the standard Day and UTCTime types.

A SmartDate is a date which may be partially-specified or relative. Eg 2008/12/31, but also 2008/12, 12/31, tomorrow, last week, next year. We represent these as a triple of strings like ("2008","12",""), ("","","tomorrow"), ("","last","week").

A DateSpan is the span of time between two specific calendar dates, or an open-ended span where one or both dates are unspecified. (A date span with both ends unspecified matches all dates.)

An Interval is ledger's reporting interval - weekly, monthly, quarterly, etc.



splitSpan :: Interval -> DateSpan -> [DateSpan]Source

Split a DateSpan into one or more consecutive spans at the specified interval.

splitspan :: (Day -> Day) -> (Day -> Day) -> DateSpan -> [DateSpan]Source

daysInSpan :: DateSpan -> Maybe IntegerSource

Count the days in a DateSpan, or if it is open-ended return Nothing.

parsePeriodExpr :: Day -> String -> (Interval, DateSpan)Source

Parse a period expression to an Interval and overall DateSpan using the provided reference date, or raise an error.

spanFromSmartDateString :: Day -> String -> DateSpanSource

Convert a single smart date string to a date span using the provided reference date, or raise an error.

fixSmartDateStr :: Day -> String -> StringSource

Convert a smart date string to an explicit yyyy/mm/dd string using the provided reference date, or raise an error.

fixSmartDateStrEither :: Day -> String -> Either ParseError StringSource

A safe version of fixSmartDateStr.

fixSmartDate :: Day -> SmartDate -> DaySource

Convert a SmartDate to an absolute date using the provided reference date.

parsedatetimeM :: String -> Maybe LocalTimeSource

Parse a couple of date-time string formats to a time type.

parsedateM :: String -> Maybe DaySource

Parse a couple of date string formats to a time type.

parsedatetime :: String -> LocalTimeSource

Parse a date-time string to a time type, or raise an error.

parsedate :: String -> DaySource

Parse a date string to a time type, or raise an error.

parsetimewith :: ParseTime t => String -> String -> t -> tSource

Parse a time string to a time type using the provided pattern, or return the default.

smartdate :: GenParser Char st SmartDateSource

Parse a date in any of the formats allowed in ledger's period expressions, and maybe some others:

 october, oct
 yesterday, today, tomorrow
 (not yet) this/next/last week/day/month/quarter/year

Returns a SmartDate, to be converted to a full date later (see fixSmartDate). Assumes any text in the parse stream has been lowercased.

smartdateonly :: GenParser Char st SmartDateSource

Like smartdate, but there must be nothing other than whitespace after the date.