Build and Run C++ with Time and Exit Code

# Build and run a C++ file, showing execution time and exit code.
# Usage: cpprun srcfile [arg2] ... [arg99] [<file.in] [>file.out]
# Example: cpprun code.cpp <file.in >file.out  (specifying .cpp is optional)
cpprun() {
  basepath="${1%%.*}"  # Strip extension.
  [[ "$1" == "$basepath" ]] && srcpath="$basepath".cpp || srcpath=$1
  # Change the build command and arguments below as you like it it.
  # On Mac, `gcc` is likely just a clang shim and won't have bits/stdc++.h.
  # Install the real GCC with `brew install gcc` and invoke with `g++-13`.
  g++-13 "$srcpath" -o "$basepath" -O3 -std=gnu++17 -Wl,-stack_size -Wl,20000000 -Wall -Wno-variadic-macros
  status=$?
  if [ $status -eq 0 ]; then
    # On Mac, must run `brew install coreutils`
    [[ "$(uname)" == "Darwin" ]] && start=$(gdate +%s.%N) || start=$(date +%s.%N)
    # Check if argument is a path, else run in current directory.
    [[ "$basepath" == *\/* ]] && "$basepath" "${@:2:99}" || ./"$basepath" "${@:2:99}"
    status=$?
    [[ "$(uname)" == "Darwin" ]] && end=$(gdate +%s.%N) || end=$(date +%s.%N)
    runtime=$(python -c "print('{0:.0f}m {1:.3f}s'.format(*divmod(${end}-${start},60)))")
    echo "Finished in $runtime with exit code ${status}." >&2
    return $status
  else
    echo "Build failed" >&2
    return $status
  fi
}