console.log from pure functions h/t @z0age

pureConsole.sol

// @author original POC by @z0age


library pureConsole {

    /*********************
     * string + uint256
     ********************/

    function log(string memory errorMessage, uint256 value) internal pure {
        _castToPureStringUint(_logStringUint)(errorMessage, value);
    }

    function _castToPureStringUint(function(string memory, uint256) internal view fnIn)
        internal
        pure
        returns (function(string memory, uint256) pure fnOut)
    {
        assembly {
            fnOut := fnIn
        }
    }

    function _logStringUint(string memory errorMessage, uint256 value) internal view {
        console.log(errorMessage, value);
    }

    /*********************
     * uint256 only
     ********************/

    function log(uint256 value) internal pure {
        _castToPureUint(_logUint)(value);
    }

    function _castToPureUint(function(uint256) internal view fnIn)
        internal
        pure
        returns (function(uint256) pure fnOut)
    {
        assembly {
            fnOut := fnIn
        }
    }

    function _logUint(uint256 value) internal view {
        console.log(value);
    }

    /*********************
     * string only
     ********************/

    function log(string memory value) internal pure {
        _castToPureString(_logString)(value);
    }

    function _castToPureString(function(string memory) internal view fnIn)
        internal
        pure
        returns (function(string memory) pure fnOut)
    {
        assembly {
            fnOut := fnIn
        }
    }

    function _logString(string memory value) internal view {
        console.log(value);
    }


}