Cheap Sketch file version control with Git + Kaleidoscope

.gitconfig

# Add this to your .git/config file

[diff]
  tool = SketchKaleidoscope
[difftool "SketchKaleidoscope"]
  cmd = ./util-sketch-kaleidoscope-diff.bash \"$MERGED\" \"$LOCAL\" \"$REMOTE\"

util-sketch-kaleidoscope-diff.bash

#!/bin/bash
# Check this file into your git repo
MERGED="$1"
FILE_1="$2"
FILE_2="$3"

BASENAME=`basename "$MERGED"`
BASENAME="${BASENAME%.sketch}"

# Create temp directories to export stuff into
TEMP_DIR_1=`mktemp -d`
TEMP_DIR_2=`mktemp -d`

function unpack_sketch_file {
  IN_FILE="$1"
  OUT_PATH="$2/$BASENAME/"

  SKETCHTOOL="/Applications/Sketch.app/Contents/Resources/sketchtool/bin/sketchtool"

  echo "$BASENAME: Unpacking $3..."

  mkdir -p "$OUT_PATH"
  "$SKETCHTOOL" export artboards "$IN_FILE" \
      --output="$OUT_PATH/artboards" \
      --include-symbols=YES \
      >/dev/null
  "$SKETCHTOOL" export pages "$IN_FILE" \
      --output="$OUT_PATH" \
      --max-size=1000 \
      >/dev/null
}

# Unpack sketch files
unpack_sketch_file "$FILE_1" "$TEMP_DIR_1" "left sketch file"
unpack_sketch_file "$FILE_2" "$TEMP_DIR_2" "right sketch file"

# Kaleidoscope diff on the two paths
ksdiff --partial-changeset -- "$TEMP_DIR_1" "$TEMP_DIR_2"

Super delayed response! This script unpacks both the previous (left) and new (right) Sketch files using sketchtool (a binary that ships with Sketch) and then compares the two results (which are each directories of png screenshots of artboards)