pre-commit.bat

REM Subversion pre-commit hook for Windows machine
REM put this in your SVN repository folder /hooks/pre-commit.bat
REM we use it with svn version 
REM http://stackoverflow.com/questions/869248/windows-pre-commit-hook-for-comment-length-subversion

@echo off  
:: Stops commits that have empty log messages.        
@echo off  

setlocal  

rem Subversion sends through the path to the repository and transaction id  
set REPOS=%1  
set TXN=%2           

rem line below ensures at least one character ".", 5 characters require change to "....."
svnlook log %REPOS% -t %TXN% | findstr . > nul  
if %errorlevel% gtr 0 (goto err) else exit 0  

:err  
echo. 1>&2  
echo Your commit has been blocked because you didn't enter a comment. 1>&2  
echo Write a log message describing the changes made and try again. 1>&2
echo Thanks 1>&2
exit 1

Thanks !