From b7a8ddb0bc8a41e5544fcaca76af5db828a4e8da Mon Sep 17 00:00:00 2001
From: Alex Windett <windettalex@gmail.com>
Date: Fri, 17 Feb 2017 15:42:52 +0000
Subject: [PATCH] changing file permisisons

---
 README.md    |  2 +-
 bin/sketch   | 57 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 package.json |  2 +-
 3 files changed, 59 insertions(+), 2 deletions(-)
 create mode 100755 bin/sketch

diff --git a/README.md b/README.md
index 07557f98..1b6b0051 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@ running `make`, make continues without any errors, then you are good to go. [nod
 is also needed if deployment to Triton is required.
 
 ```
-make && make install
+make && make install 
 ```
 
 Then to run each individual component locally (subject to change).
diff --git a/bin/sketch b/bin/sketch
new file mode 100755
index 00000000..11262833
--- /dev/null
+++ b/bin/sketch
@@ -0,0 +1,57 @@
+#!/usr/bin/env ruby
+require 'fileutils'
+
+PROGNAME = 'pre-commit (auto-generate sketch previews)'
+
+def main
+  progress "Installing sketchtool"
+  system!(%W[/Applications/Sketch.app/Contents/Resources/sketchtool/install.sh])
+
+  progress "Looking for changed or added .sketch files"
+  diff_output = capture!(%W[git diff --name-only --cached --pretty=format:])
+  sketch_files = diff_output.split("\n").grep(/\.sketch\z/)
+  if sketch_files.empty?
+    progress "No sketch files to create preview images for in this commit!"
+  end
+  puts sketch_files
+
+  sketch_files.each do |f|
+    unless File.exist?(f)
+      progress "#{f} does not exist (anymore?)"
+      next
+    end
+
+    png_output_dir = f.sub(/\.sketch\z/, '') + '-sketch-previews'
+    progress "deleting old previews"
+    FileUtils.rm_rf(png_output_dir)
+
+    progress "exporting pages"
+    cmd = %W[sketchtool --overwriting=YES --output=#{png_output_dir} export pages #{f}]
+    system!(cmd)
+
+    progress "adding to git"
+    system!(%W[git add #{png_output_dir}])
+  end
+end
+
+def system!(cmd)
+  puts "running: #{cmd.join(' ')}"
+  abort failure_message(cmd) unless system(*cmd)
+end
+
+def capture!(cmd)
+  puts "capturing: #{cmd.join(' ')}"
+  result = IO.popen(cmd) { |io| io.read }
+  abort failure_message(cmd) unless $?.success?
+  result
+end
+
+def failure_message(cmd)
+  "#{PROGNAME}: command failed: #{cmd.join(' ')}"
+end
+
+def progress(msg)
+  puts "#{PROGNAME}: #{msg}"
+end
+
+main
diff --git a/package.json b/package.json
index 4c7b4b62..91ac7b02 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,7 @@
   },
   "scripts": {
     "test": "make test",
-    "precommit": "make -j4 lint",
+    "precommit": "make -j4 lint && ./bin/sketch",
     "prepush": "make test"
   },
   "dependencies": {