add script to build a cross walk from node semver to process.versions.modules…

add script to build a cross walk from node semver to process.versions.modules value - refs https://github.com/developmentseed/node-sqlite3/wiki/Binaries

build-util/crosswalk-semver-to-module.js

+var https = require("https");
+var http = require("http");
+var fs   = require("fs");
+var url = require('url');
+var semver = require('semver');
+
+var cross = {};
+
+// https://github.com/developmentseed/node-sqlite3/wiki/Binaries
+
+var template = 'https://raw.github.com/joyent/node/v{VERSION}/src/';
+
+var sortObjectByKey = function(obj){
+    var keys = [];
+    var sorted_obj = {};
+    for(var key in obj){
+        if(obj.hasOwnProperty(key)){
+            keys.push(key);
+        }
+    }
+    // sort keys
+    keys.sort(function(a,b) {
+      if (semver.gt(a, b)) {
+        return 1
+      }
+      return -1;
+    });
+    len = keys.length;
+
+    for (i = 0; i < len; i++)
+    {
+      key = keys[i];
+      sorted_obj[key] = obj[key];
+    }
+    return sorted_obj;
+};
+
+function get(ver,callback) {
+  var header = 'node.h';
+  if (semver.gt(ver, 'v0.11.4')) {
+    // https://github.com/joyent/node/commit/44ed42bd971d58b294222d983cfe2908e021fb5d#src/node_version.h
+    header = 'node_version.h';
+  }
+  var path = template.replace('{VERSION}',ver) + header;
+  var uri = url.parse(path);
+  https.get(uri, function(res) {
+      if (res.statusCode != 200) {
+        throw new Error("server returned " + res.statusCode + ' for: ' + path);
+      }
+      res.setEncoding('utf8');
+      var body = '';
+      res.on('data', function (chunk) {
+        body += chunk;
+      });
+      res.on('end',function(err) {
+        var term = 'define NODE_MODULE_VERSION'
+        var idx = body.indexOf(term);
+        var following = body.slice(idx);
+        var end = following.indexOf('\n');
+        var value = following.slice(term.length,end).trim();
+        if (value[0] === '(' && value[value.length-1] == ')') {
+          value = value.slice(1,value.length-1);
+        } else if (value.indexOf(' ') > -1) {
+          value = value.slice(0,value.indexOf(' '));
+        }
+        var int_val = +value;
+        cross[ver] = int_val;
+        return callback(null,ver,int_val);
+      })
+    });
+}
+
+process.on('exit', function(err) {
+    var sorted = sortObjectByKey(cross);
+    console.log(sorted);
+})
+
+var versions_doc = 'http://nodejs.org/dist/npm-versions.txt';
+http.get(url.parse(versions_doc), function(res) {
+    if (res.statusCode != 200) {
+      throw new Error("server returned " + res.statusCode + ' for: ' + versions_doc);
+    }
+    res.setEncoding('utf8');
+    var body = '';
+    res.on('data', function (chunk) {
+      body += chunk;
+    });
+    res.on('end',function(err) {
+      var lines = body.split('\n').map(function(line) { return line.split(' ')[0].slice(1); }).filter(function(line) { return (line.length && line != 'node'); });
+      lines.forEach(function(ver) {
+          get(ver,function(err,version,result) {
+            cross[version] = result;
+          });
+      });
+    });
+});
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