Subversion, SourceGear's Diffmerge and Cygwin

A while back in my Arsenal Selection post I described a way to use SourceGear's Diffmerge with Mercurial. No that I started to commit stuff to my SIP Communicator branch, I needed to do the same with SVN (which I run under Cygwin).

It turns out to be a little trickier with SVN firstly because SVN is not that versatile as Mercurial and second because I use SVN under Cygwin which results in paths being delivered in diffmerge Cygwinized.

To enable a 3d party diff tool you need add something like this in your ~/.subversion/config file (c:\cygwin\home\your_user\.subversion\config):

diff-cmd = diffwrapper.sh

With the help of Eric's post Living with Subversion and Pete's post Subversion, KDiff3, and Cygwin I've built diffwrapper.sh to look like this:

#!/bin/sh

LEFT=`cygpath -d ${6}`
RIGHT=`cygpath -d ${7}`

# thanks to jtr for the sed regex
LEFT_NAME=`echo ${3} | sed 's/.*\/\([^/]*\)/\1/'`
RIGHT_NAME=`echo ${5} | sed 's/.*\/\([^/]*\)/\1/'` #src/net/java/sip/communicator/impl/protocol/jabber/OperationSetInstantMessageTransformJabberImpl.java (revision 0)

/cygdrive/c/Program\ Files/SourceGear/Vault\ Client/sgdm.exe /title1:"$LEFT_NAME" "$LEFT" /title2:"$RIGHT_NAME" "$RIGHT"

Now you need to make sure that diffwrapper.sh script is somewhere in your PATH. I've added in ~/bin, and did

echo export PATH="\$PATH:$HOME/bin" >> ~/.bashrc

Update: Friday, 24 July, 2009
Here's a mergewrapper.sh script

#!/bin/sh
local=`cygpath -d ${3}`
remote=`cygpath -d ${2}`
base=`cygpath -d ${1}`
merged=`cygpath -d ${4}`
/cygdrive/c/Program\ Files/SourceGear/Vault\ Client/sgdm.exe /result:"$merged" /title1:"Local" /title2:"Merged" /title3:"Remote" "$local" "$merged" "$remote"