[merge]
    tool = intellij
[mergetool "intellij"]
    cmd = cmd \\"/C D:\\\\workspace\\\\tools\\\\symlink\\\\idea\\\\bin\\\\idea.bat merge $(cd $(dirname "$LOCAL") && pwd)/$(basename "$LOCAL") $(cd $(dirname "$REMOTE") && pwd)/$(basename "$REMOTE") $(cd $(dirname "$BASE") && pwd)/$(basename "$BASE") $(cd $(dirname "$MERGED") && pwd)/$(basename "$MERGED")\\"
    keepBackup = false
    keepbackup = false
    trustExitCode = true

The one gotcha here is that this cmd property does not accept any weird characters in the path. If your IDE’s install location has weird characters in it (e.g. it’s installed in Program Files (x86), you’ll have to create a symlink