#!/usr/bin/env bash

set -e

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

function clean {
  rm -fr dist/*
  touch dist/.keep

  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 {
  DIRECTORY_NAME=$1
  shift 1
  pushd "src/${DIRECTORY_NAME}"

  rst2pdf "${RST_FILENAME}" \
    --break-level 1 \
    -e preprocess \
    --fit-background-mode scale \
    --font-path ../fonts \
    --output "../../dist/${DIRECTORY_NAME}.pdf" \
    --stylesheets ../styles/style-light,vs \
    "${@}"

  popd
  tree dist
}

function pdf:present {
  TALK_PATH=$1
  shift 1

  pdfpc "${@}" "dist/${TALK_PATH}.pdf" --switch-screens
}

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

TIMEFORMAT=$'\nTask completed in %3lR'
time "${@:-help}"