ui: simply concatenate messages before applying color labels This should be cheaper in space than applying labels for each message.

ui: simplify interface of low-level write() functions _write() and _write_err() will be replaced with fout.write() and ferr.write() respectively. This is the first step.

ui: factor out function that writes data to fout/ferr with labeling I'm thinking of adding an option to send status messages to stderr (or a dedicated command-server channel) so that structured output (e.g. JSON) would never be interleaved with non-formatter output. A unified write() interface helps to do that.

ui: consolidate places where _progclear() is called The progress bar has to be cleared when we start writing some data to the output stream. Let's make it always triggered immediately before switching by _colormode, so that we can easily factor out helper functions.

templater: compute revset lazily This speeds up e.g. "{ifcontains(rev, revset('::.'), ...)}" in common cases where 'rev' is near the working parent. The templater API is ugly, but it helps here. 'f' can be either a generator or a function returning a generator.

remotefilelog: drop compat code for "getbundle_shallow" wireprotocol command Doing some annotate on hgexperimental shows that getbundle_shallow used to exist in 2013 or before. We don't have any pre-2013 remotefilelog users except Fb themselves and I doubt they are going to use in-core remotefilelog. So it's safe to remove this. Differential Revision: https://phab.mercurial-scm.org/D5193

tests: remove lz4 as dependency while running tests One of the previous patch authored by Augie rips out the lz4 dependency and things should work without it. Now there are just 2-3 tests failing because of same change in emitrevisions() API. Differential Revision: https://phab.mercurial-scm.org/D5192

remotefilelogserver: add a matcher argument to _walkstreamfiles() Implementing narrow stream clones in core, I added an optional matcher argument. The function in remotefilelogserver.py does not know about that argument and does not accept that and hence some tests fails. Differential Revision: https://phab.mercurial-scm.org/D5191

shallowutil: introduce a helper function isenabled() This patch introduces a inenabled() function which will check whether remotefilelog is enabled or not. The function is then also used at all the places where check whether remotefilelog is enabled or not. The new function makes code easy to read without need to understand what is the constant involved and why we are checking repo.requirements. Differential Revision: https://phab.mercurial-scm.org/D5190

remotefilelog: remove some BC code related to streamclone Since remotefilelog is now moved to core and we have streamclone._walkstreamfiles() in core, we don't need to have the backward compatibility code. People with old mercurial version should use remotefilelog from hg-experimental repo as IMO remotefilelog will go under a good refactoring and old clients will break. # no-check-commit foo_bar function name Differential Revision: https://phab.mercurial-scm.org/D5189