#!/bin/bash

set -e

PDF_FILENAME=slides.pdf
RST_FILENAME=slides.rst
THUMBNAIL_FILENAME=thumbnail.jpg

function clean:all {
  # Clean all generated files.

  find . \
    -type f \( -name "${PDF_FILENAME}*" -o -name *.build_temp -o -name ${THUMBNAIL_FILENAME} \) \
    -delete
}

function help {
  printf "%s <task> [args]\n\nTasks:\n" "${0}"

  compgen -A function | grep -v "^_" | cat -n

  printf "\nExtended help:\n  Each task has comments for general usage\n"
}

function pdf:generate {
  # Generate a new PDF file.

  DIRECTORY_NAME=$1
  shift 1

  docker run --rm -it \
    -v $HOME/.local/share/fonts:/usr/share/fonts \
    -v $PWD/${DIRECTORY_NAME}:/rst2pdf \
    -w /rst2pdf \
    opdavies/rst2pdf \
    ${RST_FILENAME} \
      --break-level 1 \
      --extension-module preprocess \
      --fit-background-mode scale \
      --font-path /usr/share/fonts \
      --output ${PDF_FILENAME} \
      --stylesheets main,tango \
      "${@}"
}

function pdf:watch {
  # Generate a new PDF file and watch for changes.
  echo "TODO: pdf:watch"
}

function thumbnail:generate {
  # Generate a thumbnail image of the first slide in the presentation.
  echo "TODO: thumbnail:generate"
}

eval "${@:-help}"