D6659: graft: split graft code into seperate functions

[pulkit (Pulkit Goyal)]

pulkit added a comment.


  Turned out I have an unsubmitted comment. Also, the codebase was recently formatted, so these patches will need to be rebased. https://www.mercurial-scm.org/pipermail/mercurial-devel/2019-October/134537.html should help

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> pulkit wrote in cmdutil.py:3431
> let's initialize `graftstate` only where we need it.

I meant near line 3477 on this side.

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  https://phab.mercurial-scm.org/D6659

To: taapas1128, #hg-reviewers, durin42
Cc: pulkit, durin42, martinvonz, mercurial-devel