templatekw: add new-style template expansion to {manifest}
The goal is to allow us to easily access to nested data. The dot operator
will be introduced later so we can write '{p1.files}' instead of
'{revset("p1()") % "{files}"}' for example.
In the example above, 'p1' needs to carry a mapping dict along with its
string representation. If it were a list or a dict, it could be wrapped
semi-transparently with the _hybrid class, but for non-list/dict types,
it would be difficult to proxy all necessary functions to underlying value
type because several core operations may conflict with the ones of the
underlying value:
- hash(value) should be different from hash(wrapped(value)), which means
dict[wrapped(value)] would be invalid
- 'value == wrapped(value)' would be false, breaks 'ifcontains'
- len(wrapped(value)) may be either len(value) or len(iter(wrapped(value)))
So the wrapper has no proxy functions and its scope designed to be minimal.
It's unwrapped at eval*() functions so we don't have to care for a wrapped
object unless it's really needed:
# most template functions just call evalfuncarg()
unwrapped_value = evalfuncarg(context, mapping, args[n])
# if wrapped value is needed, use evalrawexp()
maybe_wrapped_value = evalrawexp(context, mapping, args[n])
Another idea was to wrap every template variable with a tagging class, but
which seemed uneasy without a static type checker.
This patch updates {manifest} to a mappable as an example.
templater: adjust binding strength of '%' and '|' operators (BC)
This makes 'foo|bar%baz' parsed as '(foo|bar)%baz', not 'foo|(bar%baz)'.
Perhaps it was a mistake that '%' preceded '|'. Both '|' and '%' can be
considered a kind of function application, and '|' is more like a '.' operator
seen in OO languages. So IMHO '|' should have the same (or higher) binding as
'%'.
The BC breakage should be minimal since both '|' and '%' operators have
strict requirements for their operands and 'foo|bar%baz' was invalid:
- right-hand side of '|' must be a symbol
- left-hand side of '%' must be a dict or list
- right-hand side of '%' must be a string or symbol
templatekw: just pass underlying value (or key) to joinfmt() function
Before, iter(hybrid) was proxied to hybrid.gen, which generated formatted
strings. That's why we had to apply joinfmt() to the dicts generated by
hybrid.itermaps(). Since this weird API was fixed at
a0f2d83f8083, we can
get rid of the makemap() calls from join().
scmutil: extract helper functions that returns human-readable change id
We do "'%d:%s' % (ctx...)" at several places, so let's formalize it. A low-
level function, formatrevnode(ui, rev, node), is extracted so we can pass
a manifest rev/node pair.
Note that hex() for manifest output can be replaced with hexfunc() because
it is printed only when debugflag is set.
i18n/de.po is updated so test-log.t passes with no error.
templater: extract helper to just evaluate template expression
A named function can be easily grepped and is probably good for code
readability.
templater: do not destructure operands in buildmap()
This makes the next patch slightly simpler.