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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-hgrc
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#!/bin/sh
mkdir t
cd t
hg init
echo "invalid" > .hg/hgrc
hg status 2>&1 |sed -e "s:/.*\(/t/.*\):...\1:"
#issue 1199, escaping
cd ..
hg init "foo%bar"
hg clone "foo%bar" foobar
p=`pwd`
cd foobar
cat .hg/hgrc |sed -e "s:$p:...:"
hg paths |sed -e "s:$p:...:"
hg showconfig |sed -e "s:$p:...:"
# issue1829: wrong indentation
cd ..
echo '[foo]' >> $HGRCPATH
echo ' x = y' >> $HGRCPATH
hg version 2>&1 | sed -e "s|$HGRCPATH|\$HGRCPATH|"