allow mcp node to be visible when not in Pi

mark as inactive status
to close #718

hardware/mcp3008/package.json

@@ -1,9 +1,9 @@
 {
     "name"          : "node-red-node-pi-mcp3008",
-    "version"       : "0.2.1",
+    "version"       : "0.3.0",
     "description"   : "A Node-RED node to read from the MCP3008 Analogue to Digital Converter",
     "dependencies"  : {
-        "mcp-spi-adc": "^2.0.6"
+        "mcp-spi-adc": "^3.1.0"
     },
     "repository" : {
         "type":"git",

hardware/mcp3008/pimcp3008.js

@@ -2,16 +2,23 @@
 module.exports = function(RED) {
     "use strict";
     var fs = require('fs');
+    var allOK = false;
+    var mcpadc;
     // unlikely if not on a Pi
     try {
         var cpuinfo = fs.readFileSync("/proc/cpuinfo").toString();
-        if (cpuinfo.indexOf(": BCM") === -1) { throw "Info : "+RED._("rpi-gpio.errors.ignorenode"); }
+        if (cpuinfo.indexOf(": BCM") === -1) {
+            RED.log.warn("Info : mcp3xxx : Not running on a Pi - Ignoring node");
+        }
+        else {
+            mcpadc = require('mcp-spi-adc');
+            allOK = true;
+        }
     }
     catch(err) {
-        throw "Info : "+RED._("rpi-gpio.errors.ignorenode");
+        RED.log.warn("Info : mcp3xxx : Not running on a Pi - Ignoring node");
     }
 
-    var mcpadc = require('mcp-spi-adc');
     var mcp3xxx = [];
 
     function PiMcpNode(n) {
@@ -26,6 +33,7 @@ module.exports = function(RED) {
         var opt = { speedHz:20000, deviceNumber:node.dnum, busNumber:node.bus };
         var chans = parseInt(this.dev.substr(3));
 
+        if (allOK === true) {
             try {
                 fs.statSync("/dev/spidev"+node.bus+"."+node.dnum);
                 if (mcp3xxx.length === 0) {
@@ -70,6 +78,10 @@ module.exports = function(RED) {
                 else { done(); }
             });
         }
+        else {
+            node.status({text:"node inactive."})
+        }
+    }
 
     RED.nodes.registerType("pimcp3008",PiMcpNode);
 }