Bash script to generate favicons of an assortment of sizes. Lighter, faster and more portable than online tools to achieve the same task necessary for creativity infused web development.

favicons.sh

#!/usr/bin/env bash
# from https://github.com/fariasmateuss/favicon-generator/blob/main/favicon.sh
# Provide an image as a parameter, recieve favicons
SRC_IMAGE=$1

CYAN='\033[0;36m'
RED='\033[0;31m'
COLORRESET='\033[0m'

declare -a SIZES
declare -a GENERATED
declare -a ICONS

# missing critical infrastructure 
if ! command -v convert >/dev/null 2>&1; then
	echo -e "${RED}ImageMagick is not installed.${COLORRESET}"
	exit 1
fi
# no orovided image
if [ -z "$SRC_IMAGE" ]; then
	echo -ne "${RED}You must supply a source image as the argument to this command. \n${COLORRESET}"
	exit 1
fi

# For when the image is not found
if [ ! -f "$SRC_IMAGE" ]; then
	echo -ne "${RED}Source image \"$SRC_IMAGE\" does not exist. \n${COLORRESET}"
	exit 1
fi

# create a square image as a base, make sure the base image is square too
NAME="${SRC_IMAGE/\.*/-512x512.png}"
echo -ne "${CYAN}Generating base image and regularizing image dimensions... \n${COLORRESET}"
convert "$SRC_IMAGE" -resize 512x512! -transparent white "${NAME}"

# Dimensioms of output images, adding new sizes is as simple as adding am item to this array with the square dimensions inside quotation marks
SIZES=("16x16" "32x32" "57x57" "60x60" "64x64" "70x70" "72x72" "76x76" "96x96" "114x114" "120x120" "128x128" "144x144" "150x150" "152x152" "167x167" "180x180" "192x192"
"256x256" "310x310" "512x512")

# Loop through sizes array and resize + rename image correspondingly
echo -ne "${CYAN}Generating favicons... \n${COLORRESET}"
for i in "${SIZES[@]}"; do
	: "$NAME"
	convert "$_" -resize "${i}" "${_/512x512\.png/$i\.png}"
	ICONS+=("$_")
done

echo -ne "${CYAN}Generating .ico file... \n${COLORRESET}"
convert "${ICONS[@]:0:4}" -colors 256 favicon.ico


# Create HTML tags in generated file
if [[ $2 == "-x" ]]; then
	count=0

	: >favicons.txt

	echo -ne "${CYAN}Creating html tags in favicons.txt.... \n${COLORRESET}"

	for i in "${GENERATED[@]}"; do
		echo "<link rel=\"shortcut icon\" type=\"image/png\" sizes=\"${SIZES[count]}\" href=\"${i}\" />" >>favicons.txt
		count=$((count + 1))
	done

fi

echo -ne "${RED}Favicon generation is now completed!\n${COLORRESET}"