fail is moving out of Monad and into it's own MonadFail class.
This will be enforced in GHC 8.8 (I think).
base-compat/base-compat-batteries 0.11.0 have adapted to this,
and are approaching stackage nightly
(https://github.com/commercialhaskell/stackage/issues/4802).
hledger is now ready to build with base-compat-batteries 0.11.0, once
all of our deps do (eg aeson). We are still compatible with the older
0.10.x and GHC 7.10.3 as well.
For now we are using both fails:
- new fail (from Control.Monad.Fail), used in our parsers, imported
via base-compat-batteries Control.Monad.Fail.Compat to work with
older GHC versions.
- old fail (from GHC.Base, exported by Prelude, Control.Monad,
Control.Monad.State.Strict, Prelude.Compat, ...), used in easytest's
Test, since I couldn't find their existing fail implementation to update.
To reduce (my) confusion, these are imported carefully, consistently,
and qualified everywhere as Fail.fail and Prelude.fail, with clashing
re-exports suppressed, like so:
import Prelude hiding (fail)
import qualified Prelude (fail)
import Control.Monad.State.Strict hiding (fail)
import "base-compat-batteries" Prelude.Compat hiding (fail)
import qualified "base-compat-batteries" Control.Monad.Fail.Compat as Fail
-V (and -X) now respects a report end date set with -e/-p/date: when
choosing the valuation date, similar to hledger 1.14 and Ledger.
This means that -V/-X aren't exactly like either --value=end or
--value=now. The "Effect of --value on reports" doc has been extended
accordingly, and much of it has been reworded and made more accurate.
dropped journalPrices
renamed Price to AmountPrice, AKA "transaction price"
renamed MarketPrice to PriceDirective.
added new MarketPrice (more pure form of PriceDirective without the amount style information)
Prices is now a more efficient data structure, but not used yet.
This feature turns out to be quite involved, as valuation interacts
with the many report variations. Various bugs/specs have been
fixed/clarified relating to register's running total, balance totals
etc. Eg register's total should now be the sum of the posting amount
values, not the values of the original sums. Current level of support
has been documented.
When valuing at transaction date, we once again do early valuation of
all posting amounts, to get more correct results. variants. This means
--value-at=t can be slower than other valuation modes when there are
many transactions and many prices. This could be revisited for
optimisation when things are more settled.
Instead of converting all journal amounts to value early on, we now
convert just the report amounts to value, before rendering.
This was basically how it originally worked (for the balance command),
but now it's built in to the four basic reports used by print,
register, balance and their variants - Entries, Postings, Balance,
MultiBalance - each of which now has its own xxValue helper.
This should mostly fix -V's performance when there are many
transactions and prices (the price lookups could still be optimised),
and allow more flexibility for report-specific value calculations.
+------------------------------------------++-----------------+-------------------+--------------------------+
| || hledger.999.pre | hledger.999.1sort | hledger.999.after-report |
+==========================================++=================+===================+==========================+
| -f examples/1000x1000x10.journal bal -V || 1.08 | 0.96 | 0.76 |
| -f examples/2000x1000x10.journal bal -V || 1.65 | 1.05 | 0.73 |
| -f examples/3000x1000x10.journal bal -V || 2.43 | 1.58 | 0.84 |
| -f examples/4000x1000x10.journal bal -V || 4.39 | 1.96 | 0.93 |
| -f examples/5000x1000x10.journal bal -V || 7.75 | 2.99 | 1.07 |
| -f examples/6000x1000x10.journal bal -V || 11.21 | 3.72 | 1.16 |
| -f examples/7000x1000x10.journal bal -V || 16.91 | 4.72 | 1.19 |
| -f examples/8000x1000x10.journal bal -V || 27.10 | 9.83 | 1.40 |
| -f examples/9000x1000x10.journal bal -V || 39.73 | 15.00 | 1.51 |
| -f examples/10000x1000x10.journal bal -V || 50.72 | 25.61 | 2.15 |
+------------------------------------------++-----------------+-------------------+--------------------------+
There's one new limitation, not yet resolved: -V once again can pick a
valuation date in the future, if no report end date is specified and
the journal has future-dated transactions. We prefer to avoid that,
but reports currently are pure and don't have access to today's date.
-V is still quite a bit slower than no -V, but not as much as before:
+===========================================================++=======+
| hledger.999.pre -f examples/10000x10000x10.journal bal || 5.20 |
| hledger.999.pre -f examples/10000x10000x10.journal bal -V || 57.20 |
| hledger.999 -f examples/10000x10000x10.journal bal || 5.34 |
| hledger.999 -f examples/10000x10000x10.journal bal -V || 17.50 |
+-----------------------------------------------------------++-------+
I needed to be more careful about ordering, as johannesgerer's original
code was, and the tests missed it. I think I have it now.
Found the PR whose code I have been reworking, it was #438.
