[TxMt] exiting exec in TextMate Command

[Anthony Underwood]

I have been trying to combine some tips in the thread on inserting an  
image url and the thread on using filemerge for svn merge to  
implement using filemerge using the diff bundle.

For this I am using the shell command

exec "/path/to/filemerge.app" -left $leftfile -right $rightfile

This opens filemerge but does not allow access to TextMate until you  
quit file merge. Is there a way to allow the exec command to run in  
the background so that filemerge opens and then allows access to  
textmate to edit a file.

I am also using Alan's code to allow selection of one of the files  
via a finder dialog box
leftfile=$(osascript -e 'tell app "SystemUIServer"' -e activate -e  
'return POSIX path of (choose file with prompt "Pick an file:")' -e  
'end tell').

This does not allow access to packages such as a .wdgt folder. Is  
there a way to allow the finder dialog box to access a folder such as  
this. This would also apply to a .app  folder.

Many thanks,

Anthony