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patch: support diff data loss detection and upgrade...
patch: support diff data loss detection and upgrade In worst case, generating diff in upgrade mode can be two times more expensive than generating it in git mode directly: we may have to regenerate the whole diff again whenever a git feature is detected. Also, the first diff attempt is completely buffered instead of being streamed. That said, even without having profiled it yet, I am convinced we can fast-path the upgrade mode if necessary were it to be used in regular diff commands, and not only in mq where avoiding data loss is worth the price.

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r10179:83cfa1ba stable
r10189:e451e599 default
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test-mv-cp-st-diff
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#!/bin/sh
add()
{
echo $2 >> $1
}
hg init t
cd t
# set up a boring main branch
add a a
hg add a
mkdir x
add x/x x
hg add x/x
hg ci -m0
add a m1
hg ci -m1
add a m2
add x/y y1
hg add x/y
hg ci -m2
cd ..
show()
{
echo "- $2: $1"
hg st -C $1
echo
hg diff --git $1
echo
}
count=0
# make a new branch and get diff/status output
# $1 - first commit
# $2 - second commit
# $3 - working dir action
# $4 - test description
tb()
{
hg clone t t2 ; cd t2
hg co -q -C 0
add a $count
count=`expr $count + 1`
hg ci -m "t0"
$1
hg ci -m "t1"
$2
hg ci -m "t2"
$3
echo "** $4 **"
echo "** $1 / $2 / $3"
show "" "working to parent"
show "--rev 0" "working to root"
show "--rev 2" "working to branch"
show "--rev 0 --rev ." "root to parent"
show "--rev . --rev 0" "parent to root"
show "--rev 2 --rev ." "branch to parent"
show "--rev . --rev 2" "parent to branch"
echo
cd ..
rm -rf t2
}
tb "add a a1" "add a a2" "hg mv a b" "rename in working dir"
tb "add a a1" "add a a2" "hg cp a b" "copy in working dir"
tb "hg mv a b" "add b b1" "add b w" "single rename"
tb "hg cp a b" "add b b1" "add a w" "single copy"
tb "hg mv a b" "hg mv b c" "hg mv c d" "rename chain"
tb "hg cp a b" "hg cp b c" "hg cp c d" "copy chain"
tb "add a a1" "hg mv a b" "hg mv b a" "circular rename"
tb "hg mv x y" "add y/x x1" "add y/x x2" "directory move"
# Cannot implement unrelated branch with tb
echo '% testing copies with unrelated branch'
hg init unrelated
cd unrelated
add a a
hg ci -Am adda
hg mv a b
hg ci -m movea
hg up -C null
add a a
hg ci -Am addunrelateda
echo '% unrelated branch diff'
hg diff --git -r 2 -r 1
cd ..