comparison tests/test-completion.t @ 44396:acbfa31cfaf2

debugmergestate: make templated

Our IntelliJ team wants to be able to read the merge state in order to
help the user resolve merge conflicts. They had so far been reading
file contents from p1() and p2() and their merge base. That is not
ideal for several reasons (merge base is not necessarily the "graft
base", renames are not handled, commands like `hg update -m` is not
handled). It will get especially bad as of my D7827. This patch makes
the output s a templated. I haven't bothered to make it complete
(e.g. merge driver states are not handled), but it's probably good
enough as a start.

I've done a web search for "debugmergestate" and I can't find any
indication that any tools currently rely on its output. If it turns
out that we get bug reports for it once this is released, I won't
object to backing this patch out on the stable branch (and then
perhaps replace it by a separate command, or put it behind a new
flag).

The changes in test-backout.t are interesting, in particular this:

```
  -    other path: foo (node not stored in v1 format)
  +    other path:  (node foo)
```

I wonder if that means that we actually read v1 format
incorrectly. That seems to be an old format that was switched away
from in 2014, so it doesn't matter now anyway.

Differential Revision: https://phab.mercurial-scm.org/D8120

44395:382f4f09f0bd

  debuginstall: template
  debugknown: 
  debuglabelcomplete: 
  debuglocks: force-lock, force-wlock, set-lock, set-wlock
  debugmanifestfulltextcache: clear, add
  debugmergestate: 
  debugnamecomplete: 
  debugnodemap: dump-new, dump-disk, check, metadata
  debugobsolete: flags, record-parents, rev, exclusive, index, delete, date, user, template
  debugp1copies: rev
  debugp2copies: rev

44396:acbfa31cfaf2

  debuginstall: template
  debugknown: 
  debuglabelcomplete: 
  debuglocks: force-lock, force-wlock, set-lock, set-wlock
  debugmanifestfulltextcache: clear, add
  debugmergestate: style, template
  debugnamecomplete: 
  debugnodemap: dump-new, dump-disk, check, metadata
  debugobsolete: flags, record-parents, rev, exclusive, index, delete, date, user, template
  debugp1copies: rev
  debugp2copies: rev