From d76535b4d2bd07de8d531b8d9499929c725382fb Mon Sep 17 00:00:00 2001
From: Dave Eddy <dave@daveeddy.com>
Date: Tue, 1 Sep 2015 13:47:35 -0400
Subject: [PATCH] negative sizes support, add more tests

---
 lib/common.js            | 7 +++++--
 test/unit/common.test.js | 6 ++++++
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/lib/common.js b/lib/common.js
index 3248a83..a6b90d2 100755
--- a/lib/common.js
+++ b/lib/common.js
@@ -206,12 +206,15 @@ function humanSizeFromBytes(opts, bytes) {
     if (opts.narrow) {
         sizes = ['B', 'K', 'M', 'G', 'T', 'P'];
     }
-    var template = opts.narrow ? '%s%s' : '%s %s';
+    var template = opts.narrow ? '%s%s%s' : '%s%s %s';
 
     if (bytes === 0) {
         return '0 B';
     }
 
+    var sign = bytes < 0 ? '-' : '';
+    bytes = Math.abs(bytes);
+
     var i = Number(Math.floor(Math.log(bytes) / Math.log(1024)));
     var s = String(bytes / Math.pow(1024, i));
     var hasDecimal = s.indexOf('.') !== -1;
@@ -238,7 +241,7 @@ function humanSizeFromBytes(opts, bytes) {
     //var precision1 = (s.indexOf('.') === -1
     //    ? s + '.0' : s.slice(0, s.indexOf('.') + 2));
 
-    return format(template, s, sizes[i]);
+    return format(template, sign, s, sizes[i]);
 }
 
 function capitalize(s) {
diff --git a/test/unit/common.test.js b/test/unit/common.test.js
index 096c377..c32079f 100644
--- a/test/unit/common.test.js
+++ b/test/unit/common.test.js
@@ -43,8 +43,14 @@ test('humanDurationFromMs', function (t) {
 test('humanSizeFromBytes', function (t) {
     var humanSizeFromBytes = common.humanSizeFromBytes;
 
+    t.equal(humanSizeFromBytes(-1), '-1.0 B');
     t.equal(humanSizeFromBytes(0), '0 B');
+    t.equal(humanSizeFromBytes(1), '1.0 B');
+
     t.equal(humanSizeFromBytes({}, 0), '0 B');
+    t.equal(humanSizeFromBytes({}, 1024), '1.0 KiB');
+    t.equal(humanSizeFromBytes({narrow: true}, 1024), '1K');
+    t.equal(humanSizeFromBytes({precision: 2}, 1024), '1.00 KiB');
 
     t.end();
 });