Using Ant, can I change a property name if it already exists? - ant

Question

I currently have a batch file that will copy some test results to a directory. That directory will have a date (yyyy-mm-dd). If that date already exists, it will create a new folder with that same date, but append a run number (yyyy-mm-dd run 2, yyyy-mm-dd run 3)
#echo off
title Copy the FF results to the results folder
set "date=%date:~10,4%-%date:~4,2%-%date:~7,2%"
set "run="
set "browser=FF"
set "results_paste=C:\TestProject\Results"
:loop
if "%run%"=="1" set "date=%date%_run "
if "%run%"=="1" set "run=2"
if EXIST "%results_paste%\%date%%run%\%browser%\" set /a run+=1&goto loop
REM Create HTML directory and copy results
xcopy "%workspace%\test-output\html\*.*" "%results_paste%\%date%%run%\%browser%\"
REM Create screenshot directory and copy results
xcopy "%workspace%\test-output\XML\screenshots\*.*" "%results_paste%\%date%%run%\XML\screenshots\"
How would I accomplish this same functionality using ANT? Here is what I have so far. I'm not sure how to check if the date folder already exists, and if it does, to create a run 2 folder.
<project default="CopyResults">
<property name="Run" value="" />
<tstamp>
<format property="Date" pattern="yyyy-mm-dd" locale="en,US,WIN" />
</tstamp>
<copy todir="C:/Results/${Date}${Run}/${Project}/${Browser}">
<fileset dir="C:/Program Files (x86)/Jenkins/jobs/${PROJECT_NAME}/workspace/test-output/html/*.*">
</copy>
<dirname property="directoryProperty" file="C:/Program Files (x86)/Jenkins/jobs/$PROJECT_NAME/workspace/test-output/${XML}/screenshots"/>
<mkdir dir="${directoryProperty}"/>
<copy todir="C:/Results/${Date}${Run}/${Project}/${XML}/screenshots/">
<fileset dir="C:/Program Files (x86)/Jenkins/jobs/${PROJECT_NAME}/workspace/test-output/${XML}/screenshots/*.*">
</copy>

Answer 1

here is how an example could look like:
<project default="CopyResults">
<property name="target" location="c:/temp/anttests"/>
<property name="source" location="C:/temp/source"/>
<target name="CopyResults">
<tstamp>
<!-- uppercase M is month -->
<format property="Date" pattern="yyyy-MM-dd" locale="en,US,WIN" />
</tstamp>
<!-- calculate increment number -->
<resourcecount property="Run">
<dirset dir="${target}">
<include name="${Date}*"/>
</dirset>
</resourcecount>
<copy todir="${target}/${Date}${Run}/">
<fileset dir="${source}">
<include name="**/*"/>
</fileset>
</copy>
<!-- rest goes here -->
</target>
the resourcecount task does the magic. In the dirset all directories with the date and optional number are selected. this is the value for Run
Hope this helps.