The include directive now tries just one reader, based on the file
extension and defaulting to journal, like the rest of hledger.
(It doesn't yet handle a reader prefix.)
Reader-finding utilities have moved from Hledger.Read to
Hledger.Read.JournalReader so the include directive can use them.
Reader changes:
- rExperimental flag removed
- old rParser renamed to rReadFn
- new rParser field provides the actual parser.
This seems to require making Reader a higher-kinded type, unfortunately.
For a long time hledger has auto-detected the file format when it's
not known, eg when reading from a file with unusual extension (like
.dat or .txt), or from standard input (-f-), or when using the include
directive (which currently ignores file extensions).
Auto-detecting has been done by trying all readers until one succeeds.
This could guess wrong in some cases, but it was so rare that it has
been working fine.
Recently, more conveniences have been added to timedot format,
increasing its overlap with journal format, which makes this kind of
auto-detection unreliable.
Auto-detection and auto-detection failures are (probably) still pretty
rare in practice. But when it does happen it's confusing, giving
misleading errors or false successes (eg printing timedot entries
instead of a journal error).
For predictability and to minimise confusion, hledger no longer tries
to guess; when there's no file extension or reader prefix, it assumes
journal format. To specify one of the other formats, you must use a
standard file extension (.timeclock, .timedot, .csv, .ssv, .tsv), or a
reader prefix (-f csv:foo.txt, -f timedot:-).
For now, the include directive still tries to autodetect
(journal/timeclock/timedot), and this can't be overridden; it will be
fixed later.
Experimental; testing and feedback welcome.
Now, org headlines before the first day entry are ignored,
regardless of content.
Note, blank lines inside a day entry are not allowed, currently.
It's now easier to be both valid journal and valid timedot at the same
time, so guessing the format of stdin is unreliable, and some tests
are failing. See following commit.
