#!/bin/bash

set -e

cd "$(dirname "$0")"

teile=(
  Kyrie
  Denn_er_hat_seinen_Engeln_
  Hoere_nun_Herr_die_Bitten
  Ich_sing_dir_mein_Lied
  Fuellt_die_Kruege_mit_Wasser
  Ueber_dir_wach_ein_Engel
)

rm -f *.pre

for teil in "${teile[@]}"
do
  (
    cd ../../${teil}
    sed -n '
      s/^[^:]*%\.pdf.*:\s*//
      T
      s/%/'"${teil##*/}"'/g
      p
    ' Makefile | \
      tr ' ' '\n' | \
      grep '\.pre$' | \
      xargs -r make "$@"
  )
done

{
  printf '\n\n'
  cat alles.ly
  printf '\n\n'
} | \
  while read -r line
  do
    if [[ "${line}" = '%LOOP%'* ]]
    then
      loopLines="${loopLines}
${line#%LOOP%}"
    else
      if [ -n "${loopLines}" ]
      then
        for teil in "${teile[@]}"
        do
          echo "${loopLines}" | \
            sed "
              s|%TEIL%|${teil}|g
              s|%TEIL-BASE%|${teil##*/}|g
              s|%IF \([^=]\+\)=\1%||g
              /%IF [^=]\+=[^=]\+%/d
            "
        done
        unset loopLines
      fi
      echo "${line}"
    fi
  done > alles.pre

lilypond alles.pre