branchmap: remove the dict interface from the branchcache class (API)
The current branchmap computation involves reading the whole branchmap from
disk, validating all the nodes even if they are not required. This leads to a
lot of time on repos which have large branchmap or a lot of branches. On large
repos, this can validate around 1000's of nodes.
On some operations, like finding whether a branch exists or not, we don't need
to validate all the nodes. Or updating heads for a single branch.
Before this patch, branchcache class was having dict interface and it was hard
to keep track of reads.
This patch removes the dict interface. Upcoming patches will implement lazy
loading and validation of data and implement better API's.
Differential Revision: https://phab.mercurial-scm.org/D6151
test-template: fix stdio mode on Windows
Otherwise, CBOR data would be corrupted. Spotted by Matt Harbison.
samplehgrcs: update the list of suggested extensions
Back in the day, this was color and pager, both of which are now
default. Churn isn't that popular, but the other four below
(obviously?) are.
samplehgrcs: clarify which lines should be uncommented
The original wording has confused at least one person. Hopefully it's
clearer this way.
https://stackoverflow.com/questions/
55288177/adding-hg-strip-to-hgrc-config-file
template: add CBOR output format
The whole output is wrapped as an array just like the other serialization
formats. It's an indefinite-length array since the size is unknown while
encoding. Maybe we can add 'cbor-stream' (and 'pickle-stream') as needed.