A shell ln() function that defers to mklink on Windows

ln.sh

case $(uname -s) in
  *MINGW*)
    ln() {
      options="$1"
      target="$2"
      link="$3"

      if ! [ -L "$link" ] && [ -d "$link" ]; then
        link="$link/$(basename "$target")"
      fi

      case "$options" in
        *f*)
          rm -rf "$link"
      esac

      directory=""
      if [ -d "$(dirname "$link")/$target" ]; then
        directory="/D"
      fi

      cmd.exe /C "mklink "$directory" $(echo "$link" | sed 's/\//\\/g') $(echo "$target" | sed 's/\//\\/g') >NUL 2>&1"
    }
    ;;
esac

I used this from Git for Windows' bash because our Android builds (supported on Linux and Mac) make use of symlinks before calling ndk-build.

Tested with symlinks only.