What this means is that the utility code, basic math, value expressions,
string formatting and option handling are now entirely decoupled from the rest
of the code. This decoupling not only greatly simplifies the more basic parts
of Ledger, but makes it much easier to test and verify its completeness.
For example, when the formatting code %X is seen by the format parser, it
turns into a call to the expression function fmt_X, which must be defined when
the format string is first compiled against an object. If that object is a
transaction, the transaction's scope will be the first to have a chance at
providing a definition. If an account is being reported, it will. If neither
does, the next scope in sequence -- soon to be the current report -- will, and
then the session object that "owns" the current Ledger session.
In 2.6, the formatting code new everything about transaction and accounts, and
relied on flags to communicate special details between them. Now the
transaction will offer the details for its own reporting, while the formatter
worries only about strings and how to output them.
You can use 'ledger period "daily in june"' to find out how Ledger will parse
that date string, plus up to the first 20 dates it encounters in the range.
Note that the 'end' displayed is currently exclusive.
This means transactions can only have day-level granularity -- which has
always been the case from an data file point of view. The advantage to this
restriction is that reports will now be immune from daylight savings related
bugs, where a transaction falls to the wrong side of a --monthly report, for
example.
complicated string of pointers, it's now just a global block of text that gets
appended to as the error is being thrown up, and can be displayed at the catch
point if desired. There are almost no cases where a thrown exception will not
result in an error message being displayed to the user.
except for several unused parameter warnings (because there is so much code
still #if 0'd out), and one implicit conversion from long long to long which
still has to be dealt with.
old system (for example, the meaning of 'a') has yet to be restored. In the
new scheme, this will be done by definition a function outside of the value
expression logic, rather than the tight coupling between journal innards and
value expressions that occurred in 2.x.
double has been disabled, because I am no longer packaging the gdtoa library
with Ledger (because double conversion really has nothing to do with what
Ledger does). If you wish to use it, you can find gdtoa in cpp-rewrite-2006,
under a sub-directory of the same name.
temporary `values' map so that account names are always properly
sorted in the subtotaled output view. As it was, they were being
reported in account creation order.
