aggregate_md.sh

#!/bin/sh

if [ ! -d "$1" ]; then
    echo Usage: $(basename "$0") BOOKDIR \> trpl.md
    echo Then: pandoc -S -o trpl.epub trpl.md
    exit 1
fi

cat "$1/README.md"
echo

grep '^ *\*' "$1/SUMMARY.md" |
sed 's/^\*/main/g' |
sed 's/^ \+\*/sub/g' |
sed 's/\[.*\](\(.*\))/\1/g' |
while read level filename; do
    cat "$1/$filename" |
    if [ "$level" = "main" ]; then
        sed 's/^\(#\+ \)/#\1/g' |
        sed 's/^% /# /g'
    else
        sed 's/^\(#\+ \)/##\1/g' |
        sed 's/^% /## /g'
    fi |
    sed 's/^\(```rust\),.*$/\1/g'
    echo
done