annotate: port to generic templater enabled by hidden -T option
If the selected formatter is other than plainformatter, raw data are passed
to the formatter. In this case, it isn't necessary (and not possible) to
calculate column widths.
Field names are substituted to be the same as "log" command.
There are a few limitations:
- "binary file" message is not included in formatted output.
- no data structure for multiple files. all lines are packed to single list.
annotate: split functions to get data without applying text formatting
This prepares for porting to generic templater API, where raw data should
be passed to the formatter.
makefunc() is necessary to build closure in list comprehension.
annotate: build format string separately from annotation data
This prepares for porting to generic templater API.
Note that we cannot use '%*s' to pad white spaces because it doesn't take
into account character widths, as described in
4f5a6df2af92.
formatter: have jsonformatter accept tuple as value
This is necessary for "annotate" to encode ctx.date() in the same manner
as jsonchangeset printer.
It doesn't support list object because keeping mutable object in _item could
be a source of hidden bugs. Also, I can't think of the use case.
formatter: extract function that encode values to json string
This is the stub for tuple support, which will be used to encode ctx.date()
in the same manner as jsonchangeset printer.