upload images along with auto-generated thumbnails to imgur and generate bbcode

teachat-imgur.sh

#!/usr/bin/env bash
## resize and upload
set -eu

## if $1 is unset
if [ -z ${1+x} ]; then
  echo "no argument given"
  exit 1
fi

# check if $img_file is a URL
url_regex='(https?|ftp|file)://[-A-Za-z0-9\+&@#/%?=~_|!:,.;]*[-A-Za-z0-9\+&@#/%=~_|]'
if [[ $1 =~ $url_regex ]]; then
  tmpfile='/tmp/teachat-imgur.jpg'
  curl -o "$tmpfile" "$1"
  imgpath="$tmpfile"
else
  imgpath="$1"
fi

shrunkimgpath="/tmp/teachat-imgur-shrunk.jpg"
# teachat allows [img] to be max 640x1000
# resize so that width is at most 600px and height is at most 950px
convert "$imgpath" -resize 600x950\> "$shrunkimgpath"

imgout=$(imgur-screenshot.sh "$imgpath")
imgshrunkout=$(imgur-screenshot.sh "$shrunkimgpath")

echo 'orig image:'
echo '----------'
echo "$imgout"
echo '----------'
echo 'shrunk image:'
echo '----------'
echo "$imgshrunkout"
echo '----------'

imgurl=$(echo "$imgout" | pcregrep -o1 'image  link: (https?.+)')
imgshrunkurl=$(echo "$imgshrunkout" | pcregrep -o1 'image  link: https?://(.+)')
# teachat needs [img] to be http and not https
imgshrunkurl="http://$imgshrunkurl"

teachatstr="[url=$imgurl][img]$imgshrunkurl[/img][/url]"
echo "$teachatstr"
echo -n "$teachatstr" | pbcopy