Question

I’m working with small binary files in Mercurial as posted.

This binary files can be dumped as text to make a diff between versions, but the problem is that the files comes in pairs (eg: Form.scx / Form.sct), and I cannot found a way to tell Mercurial to “make a snapshot” (copy to a temporary location) of the other corresponding file when I do an hg ediff.

Answer 1

As suggested by @Ryan, I ended up with a small batch previous to the diff program:

@echo off
set f1=%1
set f2=%2
::Temporary dir created by hg to copy the snapshot file
set tdir=%~dp1
::Original repository dir
set repo=%~dp2
::Filename extension
set ext=%~x1
::The binary files comes in pairs: scx/sct \ vcx/vct ...
set ex2=%ext:~0,-1%t

::Check if "dumpable" extension
echo %ext% | grep -iE "(vcx|vct|scx|sct|pjx|pjt|frx|frt)" > nul && goto DumpFile
goto diff

:DumpFile
set f1="%tdir%\_Dump1.prg"
set f2="%tdir%\_Dump2.prg"
::Get the pair file from the repository
hg cat %repo%\%~n1%ex2% -o "%~dpn1%ex2%" -R %repo%

::Do the dump, then the diff
MyDumpProgram.exe %1 %f1%
MyDumpProgram.exe %2 %f2%
goto diff

:diff
ExamDiff.exe %f1% %f2%
pause

and then config the batch in %UserProfile%\.hgrc

[extdiff]
cmd.ediff = d:\Utiles\diff2.bat