cmdstate: introduce a "saver" contextmanager and use it in place of save() Previously, the state was only saved in some paths out of these functions. This can be problematic, if the user ctrl-c's (or `kill -9`'s) the process, or we exit out of `relocate` for anything besides the "expected" reason, we won't record that we were in the middle of an evolve. One of our users has discovered that this leaves hg in a weird state; the user did something like this: ``` $ hg evolve <something goes wrong with the merge tool, hits ctrl-c> <deals with the merge conflicts> $ hg evolve --continue abort: no interrupted evolve to continue $ hg evolve abort: uncommitted changes # Note: commands.status.verbose=True is set. $ hg status M foo # The repository is in an unfinished *update* state. # No unresolved merge conflicts # To continue: hg update ``` The user did an `hg update`, but it didn't actually do anything besides take it out of the unfinished update state (the files were still dirty in the working directory).

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  $ cat >> $HGRCPATH <<EOF

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  > [ui]

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  > logtemplate={rev}:{node|short}[{bookmarks}] ({obsolete}/{phase}) {desc|firstline}\n

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  > [extensions]

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  > EOF

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  $ echo "evolve=$(echo $(dirname $TESTDIR))/hgext3rd/evolve/" >> $HGRCPATH

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  $ mkcommit() {

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  >    echo "$1" > "$1"

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  >    hg add "$1"

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  >    hg ci -m "add $1"

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  > }

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  $ hg init repo

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  $ cd repo

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  $ mkcommit a

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  $ mkcommit b

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test disabling commands

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  $ cat >> .hg/hgrc <<EOF

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  > [experimental]

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  > evolution=createmarkers

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  >   allowunstable

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  >   exchange

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  > EOF

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  $ hg prune

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  hg: unknown command 'prune'

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  (use 'hg help' for a list of commands)

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  [255]