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#!/usr/bin/env bash
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# Save piped email to "$1/YYMMDD SUBJECT.eml"
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# Don't overwrite existing file
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set -o noclobber
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message=$(cat)
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mail_date=$(<<<"$message" ggrep -oPm 1 '^Date: ?\K.*')
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formatted_date=$(date -f "$mail_date" +%y%m%d)
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# Get the first line of the subject, and change / to ∕ so it's not a subdirectory
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subject=$(<<<"$message" ggrep -oPm 1 '^Subject: ?\K.*' | sed 's,/,∕,g')
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if [[ $formatted_date == '' ]]; then
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echo Error: no date parsed
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exit 1
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elif [[ $subject == '' ]]; then
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echo Warning: no subject found
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fi
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echo "${message}" > "$1/$formatted_date $subject.eml" && echo Email saved to "$1/$formatted_date $subject.eml"
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