From 168b74bd526e85ee9488276300165ce71b733c7a Mon Sep 17 00:00:00 2001
From: Ivan Kuchin <tadump+git@gmail.com>
Date: Thu, 17 Mar 2016 01:05:23 +0100
Subject: [PATCH] use first 8 characters of sha1 hex for jpegrescan version,
 closes #131

---
 CHANGELOG.markdown                  | 2 ++
 lib/image_optim/bin_resolver/bin.rb | 5 +++--
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.markdown b/CHANGELOG.markdown
index e9c2cccb..42f8164d 100644
--- a/CHANGELOG.markdown
+++ b/CHANGELOG.markdown
@@ -2,6 +2,8 @@
 
 ## unreleased
 
+* Use first 8 characters of sha1 hex for jpegrescan version [#131](https://github.com/toy/image_optim/issues/131) [@toy](https://github.com/toy)
+
 ## v0.22.1 (2016-02-21)
 
 * Fix missing old (1.x) `pngquant` version as it was output to stderr [#123](https://github.com/toy/image_optim/issues/123) [@toy](https://github.com/toy)
diff --git a/lib/image_optim/bin_resolver/bin.rb b/lib/image_optim/bin_resolver/bin.rb
index 6e63866f..b40fc407 100644
--- a/lib/image_optim/bin_resolver/bin.rb
+++ b/lib/image_optim/bin_resolver/bin.rb
@@ -3,6 +3,7 @@
 require 'image_optim/bin_resolver/comparable_condition'
 require 'image_optim/cmd'
 require 'shellwords'
+require 'digest/sha1'
 
 class ImageOptim
   class BinResolver
@@ -87,8 +88,8 @@ def version_string
           date_str = capture("#{escaped_path} 2>&1")[date_regexp]
           Date.parse(date_str).strftime('%Y%m%d') if date_str
         when :jpegrescan
-          # jpegrescan has no version so just check presence
-          path && '-'
+          # jpegrescan has no version so use first 8 characters of sha1 hex
+          Digest::SHA1.file(path).hexdigest[0, 8] if path
         else
           fail "getting `#{name}` version is not defined"
         end