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diff: add --inverse option...
diff: add --inverse option Most of the time, one can reverse a diff by swapping the revisions passed with -r but it happens that if you use the global -R, and diff against the tip of the current repo, you can't swap the revisions. One use-case for that is reviewing changes from a bundle before unbundling. One could also pipe the output of `hg diff` to a command line filter that reverses the diff, but that would remove the benefit from color diffs. Therefore, having an option in `hg diff` to reverse a diff is a good thing. The option flag selection was tricky. GNU patch uses -R/--reverse but -R is already used as a global option and --reverse would make --rev ambiguous.

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test-fncache
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#!/bin/sh
echo "% init repo1"
hg init repo1
cd repo1
echo
echo "% add a; ci"
echo "some text" > a
hg add
hg ci -m first
echo
echo "% cat .hg/store/fncache"
cat .hg/store/fncache
echo
echo "% add a.i/b; ci"
mkdir a.i
echo "some other text" > a.i/b
hg add
hg ci -m second
echo
echo "% cat .hg/store/fncache"
cat .hg/store/fncache
echo
echo "% add a.i.hg/c; ci"
mkdir a.i.hg
echo "yet another text" > a.i.hg/c
hg add
hg ci -m third
echo
echo "% cat .hg/store/fncache"
cat .hg/store/fncache
echo
echo "% hg verify"
hg verify
echo
echo "% rm .hg/store/fncache"
rm .hg/store/fncache
echo
echo "% hg verify"
hg verify
# try non store repo encoding
cd ..
echo % non store repo
hg --config format.usestore=False init foo
cd foo
mkdir tst.d
echo foo > tst.d/foo
hg ci -Amfoo
find .hg | sort
cd ..
echo % non fncache repo
hg --config format.usefncache=False init bar
cd bar
mkdir tst.d
echo foo > tst.d/Foo
hg ci -Amfoo
find .hg | sort
exit 0