fix jstrace#2 jstrace#4 Handle zero values.

index.js

@@ -35,14 +35,14 @@ function histogram(data, opts) {
   if (opts.sort) data = data.sort(descending);
 
   var maxKey = max(data.map(function(d){ return d.key.length }));
-  var maxVal = max(data.map(function(d){ return d.val }));
+  var maxVal = max(data.map(function(d){ return d.val })) || width;
   var str = '';
 
   // blah blah histo
 
   for (var i = 0; i < data.length; i++) {
     var d = data[i];
-    var p = (d.val / maxVal) || 1;
+    var p = d.val / maxVal;
     var shown = Math.round(width * p);
     var blank = width - shown
     var bar = Array(shown + 1).join(barc);

package.json

@@ -19,5 +19,8 @@
     "should": "*",
     "bytes": "~0.2.1"
   },
-  "license": "MIT"
-}
+  "license": "MIT",
+  "scripts": {
+    "test": "node test.js"
+  }
+}

test.js

@@ -0,0 +1,20 @@
+var assert = require('assert');
+var bars = require('./index');
+
+var options = {width: 10};
+
+var zeros = {a: 0, b: 0};
+var zerosExpected = '\
+  a |            | 0\n\
+  b |            | 0\n\
+';
+assert.equal(bars(zeros, options), zerosExpected, 'it should handle all zeros');
+
+var zeroFive = {a: 0, b: 5};
+var zeroFiveExpected = '\
+  a |            | 0\n\
+  b | ########## | 5\n\
+';
+assert.equal(bars(zeroFive, options), zeroFiveExpected, 'it should handle a single zero');
+
+console.log('PASS');