index: pass only nodetree to nt_new() The function now only depends on the nodetree, not the index. Differential Revision: https://phab.mercurial-scm.org/D4111

index: drop now-redundant "nt" prefix of fields in nodetree struct Differential Revision: https://phab.mercurial-scm.org/D4110

index: move more fields onto nodetree type The fields moves are the ones that are not related to how the nodetree is used in the index and that will make sense for the new nodetree instance for a subset of the index that I'll add later. Differential Revision: https://phab.mercurial-scm.org/D4109

index: extract a type for the nodetree This is a first step towards exposing the nodetree as a Python type. Differential Revision: https://phab.mercurial-scm.org/D4108

index: make "nt_*" functions work on an initialized nodetree I want to be able to reuse these functions with another nodetree instance later (for disambiguating node prefix within a revset). That other nodetree instance won't want to be fully populated from the index, so this commit moves that part to the callers. Differential Revision: https://phab.mercurial-scm.org/D4107

changegroup: inline _packellipsischangegroup It now does nothing special. The logic is simple enough to inline in the 2 callers in narrow that need it. The changegroup generation APIs could probably be a bit simpler. But that's for another time. Differential Revision: https://phab.mercurial-scm.org/D4092

changegroup: move fullnodes into cgpacker And with this change, the narrow packer no longer defines any addition attributes on packer instances! Differential Revision: https://phab.mercurial-scm.org/D4091

changegroup: specify ellipses mode explicitly Currently, code throughout changegroup relies on the presence of self._full_nodes to enable ellipses mode. This is a very tenuous check. And the check may be wrong once we move _full_nodes into cgpacker. Let's capture the enabling of ellipses mode explicitly as a constructor argument and as an instance variable. We could probably derive ellipses mode by presence of other variables. But for now, this explicit approach seems simplest since it is most compatible with existing code. Differential Revision: https://phab.mercurial-scm.org/D4090

changegroup: pass ellipsis roots into cgpacker constructor And rename the internal variable to conform with naming conventions. Differential Revision: https://phab.mercurial-scm.org/D4089

changegroup: move revision maps to cgpacker And remove the underscores so the variables conform to our naming convention. The logic in _close() should be the only thing warranting scrutiny during review. Differential Revision: https://phab.mercurial-scm.org/D4088

changegroup: move changelogdone into cgpacker Looking at what it is used for, it feels like there is a better way to implement all this. So recording a TODO to track that. Differential Revision: https://phab.mercurial-scm.org/D4087

changegroup: declare shallow flag in constructor Thus begins the process of better formalizing ellipses and shallow changegroup generation mode so it is tracked by cgpacker at construction time instead of bolted on after the fact by a wrapper function. Differential Revision: https://phab.mercurial-scm.org/D4086

changegroup: make some packer attributes private These methods and attributes are low level and should not be called or outside outside of instances. Indicate as such through naming. Differential Revision: https://phab.mercurial-scm.org/D4085

changegroup: rename cg1packer to cgpacker There is now only a single class. We don't need to encode the version in its name since the version is a lie. Differential Revision: https://phab.mercurial-scm.org/D4084

changegroup: control delta parent behavior via constructor The last remaining override on cg2packer related to parent delta computation. We pass a parameter to the constructor to control whether to delta against the previous revision and we inline all parent delta logic into a single function. With this change, cg2packer is empty, so it has been deleted. Differential Revision: https://phab.mercurial-scm.org/D4083