Add a check for the image sizes (#203)

* Add a file-size checker in a GitHubCI

* Add coloring for failed image sizes

* Remove verbosity of passing images

* Increase limit for gifs to 2000kb

* Increase gif limit to 2200 kb

Author: davidscn

.github/workflows/checks.yaml

@@ -7,3 +7,4 @@ jobs:
       - name: Check out repository
         uses: actions/checkout@v2
       - run:  bash tools/check.sh
+      - run:  bash tools/check-size.sh

tools/check-size.sh

@@ -0,0 +1,42 @@
+#!/bin/bash
+# Run this script at the root of the repository to check the size of images
+
+CODE=0
+MAXIMUMSIZE=250
+MAXIMUMGIFSIZE=2200
+
+RED='\033[0;31m'
+NOCOLOR='\033[0m'
+
+# Check tutorials
+IGNORE="tools"
+tutorials=$(find . -maxdepth 1 -type d -not -name ".*" | grep -vE $IGNORE | sed "s/^.\///")
+
+echo "Limit for regular images: "${MAXIMUMSIZE}" kb"
+echo "Limit for gifs: "${MAXIMUMGIFSIZE}" kb"
+# For all tutorials do
+for tutorial in $tutorials; do
+  images=$(find ./"${tutorial}"/images -type f 2> /dev/null | sed "s/^.\///")
+  for img in $images; do
+    actualsize=$(du -k "$img" | cut -f 1)
+    # Check gifs
+    if [[ "${img}" == *.gif ]]; then
+      if [ "${actualsize}" -ge "${MAXIMUMGIFSIZE}" ]; then
+          echo -e "$img:$RED $actualsize kb exceeds the limit of $MAXIMUMGIFSIZE kb. $NOCOLOR"
+          CODE=1
+      else
+          echo -e "$img: $actualsize kb (Ok)."
+      fi
+    else
+      if [ "${actualsize}" -ge "${MAXIMUMSIZE}" ]; then
+         echo -e "$img:$RED $actualsize kb exceeds the limit of $MAXIMUMSIZE kb. $NOCOLOR"
+         CODE=1
+      else
+        echo -e "$img: $actualsize kb (Ok)."
+      fi
+    fi
+  done
+done
+
+[ ! "$CODE" -eq "0" ] && echo "There have been errors"
+exit $CODE