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June 10, 2020 19:56
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| #!/bin/bash | |
| # depends on imagemagick and gifsicle | |
| FONT_PATH=./fonts/Lato-Bold.ttf | |
| contains () { | |
| local e | |
| for e in "${@:2}"; do [[ "$e" == "$1" ]] && return 0; done | |
| return 1 | |
| } | |
| usage () { | |
| if [ "$1" != "" ]; then | |
| echo -e "Error: $1\n" >&2 | |
| fi | |
| echo "usage: $0 [options] <message>" | |
| echo | |
| echo "Options:" | |
| echo | |
| echo " -h Show this help message" | |
| echo | |
| echo " -o <output.gif> Path to output gif. Default: yolo.gif" | |
| echo | |
| echo " -c <color> Choose color set, valid options are:" | |
| echo " red, orange, yellow, green, blue, purple," | |
| echo " pink, black, white. Default: blue" | |
| echo | |
| echo " -w Force white text color" | |
| exit 1 | |
| } | |
| VALID_COLORS=("red" "orange" "yellow" "green" "blue" "purple" "pink" "black" "white") | |
| COLOR="white" | |
| OUTPUT="output.gif" | |
| FORCE_WHITE_TEXT=0 | |
| while getopts ":c:o:hw" opt; do | |
| case $opt in | |
| h) | |
| usage | |
| ;; | |
| w) | |
| FORCE_WHITE_TEXT=1 | |
| ;; | |
| c) | |
| if contains "$OPTARG" "${VALID_COLORS[@]}"; then | |
| COLOR="$OPTARG" | |
| else | |
| usage "Invalid color: $OPTARG" | |
| fi | |
| ;; | |
| o) | |
| OUTPUT="$OPTARG" | |
| ;; | |
| \?) | |
| usage "Invalid option: -$OPTARG" | |
| ;; | |
| :) | |
| usage "Option -$OPTARG requires an argument." | |
| exit 1 | |
| ;; | |
| esac | |
| done | |
| shift $(($OPTIND - 1)) | |
| MESSAGE="$*" | |
| if [ "$MESSAGE" == "" ]; then | |
| usage "A message is required." | |
| fi | |
| case $COLOR in | |
| red) | |
| BACKGROUND="#ef4e65" | |
| FILL="#8c2738" | |
| ;; | |
| orange) | |
| BACKGROUND="#f47820" | |
| FILL="#8e4402" | |
| ;; | |
| yellow) | |
| BACKGROUND="#f0ce15" | |
| FILL="#947c00" | |
| ;; | |
| green) | |
| BACKGROUND="#51bb7b" | |
| FILL="#267048" | |
| ;; | |
| blue) | |
| BACKGROUND="#50c6db" | |
| FILL="#01516e" | |
| ;; | |
| purple) | |
| BACKGROUND="#8351a0" | |
| FILL="#4e2760" | |
| ;; | |
| pink) | |
| BACKGROUND="#e0368c" | |
| FILL="#851252" | |
| ;; | |
| black) | |
| BACKGROUND="#5d5e5e" | |
| FILL="#262727" | |
| ;; | |
| white) | |
| BACKGROUND="#ffffff" | |
| FILL="#000000" | |
| ;; | |
| esac | |
| if [ "$FORCE_WHITE_TEXT" == 1 ]; then | |
| FILL="#ffffff" | |
| fi | |
| # Make a "unique" prefix for this run | |
| PREFIX="$(head -c 32 /dev/urandom | shasum | cut -b 1-10)" | |
| # Generate image from text input | |
| convert -background "$BACKGROUND" -fill "$FILL" -font "$FONT_PATH" -density 200 -pointsize 100 "label:${MESSAGE}" "/tmp/${PREFIX}_label.png" | |
| # Resize to 128px high | |
| convert -resize x128 "/tmp/${PREFIX}_label.png" "/tmp/${PREFIX}_sized.png" | |
| # Add white space to front and back for empty frames | |
| WIDTH="$(identify -format "%[fx:w]" "/tmp/${PREFIX}_sized.png")" | |
| CANVAS_SIZE=$(($WIDTH + 276)) # 128 PX in front, 148 in back | |
| convert -size ${CANVAS_SIZE}x128 "xc:$BACKGROUND" "/tmp/${PREFIX}_canvas.png" | |
| convert "/tmp/${PREFIX}_canvas.png" "/tmp/${PREFIX}_sized.png" -geometry +128+0 -composite "/tmp/${PREFIX}_padded.png" | |
| # Generate individual frames | |
| OFFSET=0 | |
| I=0 | |
| LIMIT=$(($CANVAS_SIZE - 128)) | |
| while [ $OFFSET -lt $LIMIT ]; do | |
| convert "/tmp/${PREFIX}_padded.png" -crop "128x128+${OFFSET}+0!" "$(printf "/tmp/${PREFIX}_frame_%05d.png" $I)" | |
| I=$(($I + 1)) | |
| OFFSET=$(($OFFSET + 10)) | |
| done | |
| ls -b /tmp/${PREFIX}_frame_*.png | xargs -I% convert -resize 48x48 % % | |
| # Compile to gif | |
| convert -delay 6 -loop 0 "/tmp/${PREFIX}_frame_*.png" "$OUTPUT" | |
| # Smush it | |
| gifsicle -bO "$OUTPUT" | |
| # Clean up! | |
| rm /tmp/${PREFIX}_*.png |
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