Open mailto: links in Fastmail Safari Single-Site webapp

gistfile1.txt

#!/bin/zsh

FASTMAIL_BASE="https://app.fastmail.com/mail/inbox/compose"

# 1. In safari, go to "https://app.fastmail.com"
# 2. Save this as "FastMail.app" in ~/Applications
# 3. Get python3 and make sure it is in path as "python3" (just try to run `python3` in a brand new terminal session

# encode URLs using python3
urlencode() {
	python3 - "$1" <<'EOF'
import sys, urllib.parse
print(urllib.parse.quote(sys.argv[1]))
EOF
}

for url in "$@"; do
	if [[ "$url" == mailto:* ]]; then
		# Strip off the mailto: scheme
		rest=${url#mailto:}

		# Everything before the first ? is the address part
		addr=${rest%%\?*}

		if [[ -n "$addr" ]]; then
			encoded_to=$(urlencode "$addr")
			 open -a ~/Applications/Fastmail.app "${FASTMAIL_BASE}?to=${encoded_to}"
		fi
	fi
done