1-shell-session.sh

find ~/Downloads/Gmail -type f | grep -v '\.git' | ruby -rdate -e 'today = Date.today; STDIN.each { |path| content = File.read(path.strip); begin; from = content.grep(/^From:/).fetch(0); date = content.grep(/^Date:/).fetch(0); puts from if Date.parse(date) > today - 365; rescue IndexError; end }' | while read line; do echo "$line" | ~/.mutt/add-aliases.sh; done

2-add-aliases.sh

#!/bin/sh
#
# From http://wcm1.web.rice.edu/mutt-tips.html

MESSAGE=$(cat)

NEWALIAS=$(echo "${MESSAGE}" | grep -m 1 ^"From: " | sed s/[\,\"\']//g | awk '{$1=""; if (NF == 3) {print "alias" $0;} else if (NF == 2) {print "alias" $0 $0;} else if (NF > 3) {print "alias", tolower($(NF-1))"-"tolower($2) $0;}}')

if grep -Fxq "$NEWALIAS" $HOME/.mutt/aliases; then
    :
else
    echo "$NEWALIAS" >> $HOME/.mutt/aliases
fi

echo "${MESSAGE}"