shelve: teach new shelf class to check if .shelve file exists
This removes the only remaining use for `shelvedfile`, so the class
now goes away.
Differential Revision: https://phab.mercurial-scm.org/D9713
$ hg init rep
$ cd rep
$ mkdir dir
$ touch foo dir/bar
$ hg -v addremove
adding dir/bar
adding foo
$ hg -v commit -m "add 1"
committing files:
dir/bar
foo
committing manifest
committing changelog
committed changeset 0:6f7f953567a2
$ cd dir/
$ touch ../foo_2 bar_2
$ hg -v addremove
adding dir/bar_2
adding foo_2
$ hg -v commit -m "add 2"
committing files:
dir/bar_2
foo_2
committing manifest
committing changelog
committed changeset 1:e65414bf35c5
$ cd ..
$ hg forget foo
$ hg -v addremove
adding foo
$ hg forget foo
$ hg -v addremove nonexistent
nonexistent: $ENOENT$
[1]
$ cd ..
$ hg init subdir
$ cd subdir
$ mkdir dir
$ cd dir
$ touch a.py
$ hg addremove 'glob:*.py'
adding a.py
$ hg forget a.py
$ hg addremove -I 'glob:*.py'
adding a.py
$ hg forget a.py
$ hg addremove
adding dir/a.py
$ cd ..
$ hg init sim
$ cd sim
$ echo a > a
$ echo a >> a
$ echo a >> a
$ echo c > c
$ hg commit -Ama
adding a
adding c
$ mv a b
$ rm c
$ echo d > d
$ hg addremove -n -s 50 # issue 1696
removing a
adding b
removing c
adding d
recording removal of a as rename to b (100% similar)
$ hg addremove -ns 50 --color debug
[ui.addremove.removed ui.status|removing a]
[ui.addremove.added ui.status|adding b]
[ui.addremove.removed ui.status|removing c]
[ui.addremove.added ui.status|adding d]
[ ui.status|recording removal of a as rename to b (100% similar)]
$ hg addremove -s 50
removing a
adding b
removing c
adding d
recording removal of a as rename to b (100% similar)
$ hg commit -mb
$ cp b c
$ hg forget b
$ hg addremove -s 50
adding b
adding c
$ rm c
$ hg ci -A -m "c" nonexistent
nonexistent: $ENOENT$
abort: failed to mark all new/missing files as added/removed
[255]
$ hg st
! c
$ cd ..