mutt-trans

#!/bin/sh
#
# NAME
#
#   mutt-trans - helper script to pipe message thru trans(1)
#
# SYNOPSIS
#
#   mutt-trans < .../path/to/message
#
# DEPENDENCIES
#
#   less(1), md5sum(1), mktemp(1), and trans(1)
#

: ${PAGER:=less}

tmpfile="$(mktemp -u)"
trap 'rm -rf "$tmpfile" >/dev/null 2>&1' EXIT
trap 'exit 2' HUP INT QUIT TERM

cache="$HOME/.cache/mutt/trans"
mkdir -p "$cache"

cat >"$tmpfile"

out="$cache/$(md5sum "$tmpfile" | cut -d ' ' -f 1)"

[ -f "$out" ] ||  {
    echo >&2 "${0##*/}: translating..."

    awk '
        BEGIN { visible = 0 }
        /^(Subject|Date|From|To|Cc|Bcc|Sender):/ { print }
        /^\s*$/ { visible = 1 }
        {
            if (visible)
                print
        }
    ' "$tmpfile"          \
        | trans           \
          -brief          \
          -no-autocorrect \
          -no-theme       \
          -no-browser     \
          -no-warn        \
          -output "$out"
}

exec "$PAGER" "$out"