plebgpio provides a high level API for GPIO operation of LEDs and buttons.  It can be run from Bash (Unix shell) or NodeJS. 

Key features: 
• The interface is higher level; for example one may write a color to an LED. 
• Operation does not require root privileges

This is not commplete.  'plebgpio' C code is fine but the Javascript code is not.

It was developed for Ubuntu Linux but may run on other distributions 

While root privilege is required to install 'plebgpio', it is not required to invoke it. 

Normal operation is done by invoking a compiled program ('plebgpio') from the shell or from NodeJS.  Parameters tell 'plebgpio' what to do.  The program iself holds no state.  Instead, the calling utility hands in parameters representing a command, and the current state.  The program executes the command and hands back a new state. 

So a series of shell calls would look like this.

export GPIO="";export GPIO=$(plebgpio initialize 1);
export GPIO=$(plebgpio write led1 $GPIO red)

The shell variable GPIO holds the state information.

plebgpio is controlled with reference to LEDs and BTNs, not pins.  The mapping from one to another is coded into the program iself.  In fact, there are eight mappings available.  The actual mapping is selected with the initialize command.

//        ~  ~  ~   LED-0   ~  ~  ~       ~  ~  ~   LED-1   ~  ~  ~       ~  ~  ~   LED-2   ~  ~  ~     BTN-0   BTN-1   BTN-2  empty
//        R       G       B       W       R       G       B       W       R       G       B       W
    {     17 ,    27 ,    22 ,    22 ,    25 ,     8 ,     7 ,     7 ,    11 ,     9 ,    10 ,    10 ,    17 ,     4 ,     0 ,     0  },
    {      0 ,     0 ,     0 ,     0 ,     1 ,     1 ,     1 ,     0 ,     1 ,     1 ,     1 ,     0 ,     1 ,     0 ,     0 ,     0  },
//        0       1       2       3       4       5       6       7       8       9      10      11      12      13      14      15      16      

The first row gives pin numbers and the second row are bits to say what pins are available to plebgpio.