feat(resources): automatically generate Windows ICO file

Also corrects the location/adds several other resources

resources/generate.sh

@@ -2,9 +2,11 @@
 
 # export all slices marked for export to the proper directory
 echo "Exporting all assets from src.sketch..."
+# sketchtool is installed by install.sh
 sketchtool export layers src.sketch
 
 function postprocess {
+  # $1 = distribution name
   echo "Beginning postprocessing for $1..."
 
   echo "Postprocessing assets for macOS..."
@@ -15,6 +17,14 @@ function postprocess {
   tiffutil -cathidpicheck $1/mac/dmg-background.png $1/mac/dmg-background@2x.png -out $1/mac/dmg-background.tiff
   echo "Removing raw background pngs..."
   rm $1/mac/dmg-background.png $1/mac/dmg-background@2x.png
+
+  echo "Postprocessing assets for Windows..."
+
+  echo "Combining windows/ico pngs into a single ICO file..."
+  # convert ships with imagemagick
+  convert $1/windows/ico/ico_16x16.png $1/windows/ico/ico_24x24.png $1/windows/ico/ico_32x32.png $1/windows/ico/ico_48x48.png $1/windows/ico/ico_64x64.png $1/windows/ico/ico_128x128.png $1/windows/ico/ico_256x256.png $1/windows/icon.ico
+  echo "Removing raw windows/ico pngs..."
+  rm -r $1/windows/ico/* && rmdir $1/windows/ico
 }
 
 function iconset {

resources/install.sh

@@ -1,2 +1,8 @@
+echo "Installing sketchtool... (this requires Sketch.app)"
 # This installs sketchtool: https://www.sketchapp.com/tool/
 sh /Applications/Sketch.app/Contents/Resources/sketchtool/install.sh
+
+echo "Installing imagemagick... (This requires Homebrew)"
+# This requires Homebrew: http://brew.sh/
+brew install imagemagick
+# imagemagick provides the `convert` utility, used to generate ICO files

resources/readme.md

@@ -4,9 +4,9 @@ This directory contains a `src.sketch` file from which all other assets are expo
 
 ## Requirements
 
-You'll need [Sketch](https://www.sketchapp.com/) to make any changes to this directory.
+You'll need [Sketch](https://www.sketchapp.com/) to make any changes to this directory. You'll also need to have [Homebrew](http://brew.sh/) installed to regenerate all assets.
 
-Sketch is only available for macOS, and several processes in `generate.sh` require utilities that ship with the OS, so this process must be performed on macOS.
+Sketch and Homebrew are only available for macOS, and several processes in `generate.sh` require utilities that ship with macOS, so this process requires macOS.
 
 ## Install sketchtool