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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.
Martin Geisler - - Load All Authors

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test-mq-header-from
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#!/bin/sh
echo "[extensions]" >> $HGRCPATH
echo "mq=" >> $HGRCPATH
echo "[diff]" >> $HGRCPATH
echo "nodates=true" >> $HGRCPATH
catlog() {
cat .hg/patches/$1.patch | sed -e "s/^diff \-r [0-9a-f]* /diff -r ... /"
hg log --template "{rev}: {desc} - {author}\n"
}
echo ==== init
hg init a
cd a
hg qinit
echo ==== qnew -U
hg qnew -U 1.patch
catlog 1
echo ==== qref
echo "1" >1
hg add
hg qref
catlog 1
echo ==== qref -u
hg qref -u mary
catlog 1
echo ==== qnew
hg qnew 2.patch
echo "2" >2
hg add
hg qref
catlog 2
echo ==== qref -u
hg qref -u jane
catlog 2
echo ==== qnew -U -m
hg qnew -U -m "Three" 3.patch
catlog 3
echo ==== qref
echo "3" >3
hg add
hg qref
catlog 3
echo ==== qref -m
hg qref -m "Drei"
catlog 3
echo ==== qref -u
hg qref -u mary
catlog 3
echo ==== qref -u -m
hg qref -u maria -m "Three (again)"
catlog 3
echo ==== qnew -m
hg qnew -m "Four" 4.patch
echo "4" >4
hg add
hg qref
catlog 4
echo ==== qref -u
hg qref -u jane
catlog 4
echo ==== qnew with HG header
hg qnew 5.patch
hg qpop
echo "# HG changeset patch" >>.hg/patches/5.patch
echo "# User johndoe" >>.hg/patches/5.patch
hg qpush 2>&1 | grep 'now at'
catlog 5
echo ==== hg qref
echo "5" >5
hg add
hg qref
catlog 5
echo ==== hg qref -U
hg qref -U
catlog 5
echo ==== hg qref -u
hg qref -u johndeere
catlog 5
echo ==== "qpop -a / qpush -a"
hg qpop -a
hg qpush -a
hg log --template "{rev}: {desc} - {author}\n"