entrypoint.sh

#!/usr/bin/env bash

set -eo pipefail
shopt -s extglob globstar nullglob

function info() {
  echo -e "\033[1;34m$1\033[0m"
}

function warn() {
  echo "::warning :: $1"
}

function error() {
  echo "::error :: $1"
  exit 1
}

root_file="${1}"
working_directory="${2}"
work_in_root_file_dir="${3}"
continue_on_error="${4}"
compiler="${5}"
args="${6}"
extra_system_packages="${7}"
extra_fonts="${8}"
pre_compile="${9}"
post_compile="${10}"
latexmk_shell_escape="${11}"
latexmk_use_lualatex="${12}"
latexmk_use_xelatex="${13}"

# install git on old images
if ! command -v git &> /dev/null; then
  apt-get update -qq && apt-get install -qq -y git
fi
git config --system --add safe.directory "${GITHUB_WORKSPACE}"

if [[ -z "${root_file}" ]]; then
  error "Input 'root_file' is missing."
fi

readarray -t root_file <<< "${root_file}"

if [[ ! -d "${working_directory}" ]]; then
  mkdir -p "${working_directory}"
fi
cd "${working_directory}"

expanded_root_file=()
for pattern in "${root_file[@]}"; do
  # shellcheck disable=SC2206
  expanded=(${pattern})
  expanded_root_file+=("${expanded[@]}")
done
root_file=("${expanded_root_file[@]}")

if [[ -z "${compiler}" && -z "${args}" ]]; then
  warn "Input 'compiler' and 'args' are both empty. Reset them to default values."
  compiler="latexmk"
  args="-pdf -file-line-error -halt-on-error -interaction=nonstopmode"
fi

IFS=' ' read -r -a args <<< "${args}"

if [[ "${compiler}" = "latexmk" ]]; then
  if [[ "${latexmk_shell_escape}" = "true" ]]; then
    args+=("-shell-escape")
  fi

  if [[ "${latexmk_use_lualatex}" = "true" && "${latexmk_use_xelatex}" = "true" ]]; then
    error "Input 'latexmk_use_lualatex' and 'latexmk_use_xelatex' cannot be used at the same time."
  fi

  if [[ "${latexmk_use_lualatex}" = "true" ]]; then
    for i in "${!args[@]}"; do
      if [[ "${args[i]}" = "-pdf" ]]; then
        unset 'args[i]'
      fi
    done
    args+=("-lualatex")
    # LuaLaTeX use --flag instead of -flag for arguments.
    for VAR in -file-line-error -halt-on-error -shell-escape; do
      for i in "${!args[@]}"; do
        if [[ "${args[i]}" = "${VAR}" ]]; then
          args[i]="-${VAR}"
        fi
      done
    done
    args=("${args[@]/#-interaction=/--interaction=}")
  fi

  if [[ "${latexmk_use_xelatex}" = "true" ]]; then
    for i in "${!args[@]}"; do
      if [[ "${args[i]}" = "-pdf" ]]; then
        unset 'args[i]'
      fi
    done
    args+=("-xelatex")
  fi
else
  for VAR in "${!latexmk_@}"; do
    if [[ "${!VAR}" = "true" ]]; then
      error "Input '${VAR}' is only valid if input 'compiler' is set to 'latexmk'."
    fi
  done
fi

if [[ -n "${extra_system_packages}" ]]; then
  apt-get update -qq
  IFS=$' \t\n'
  for pkg in ${extra_system_packages}; do
    info "Install ${pkg} by apt"
    apt-get install -qq -y "${pkg}"
  done
fi

if [[ -n "${extra_fonts}" ]]; then
  readarray -t extra_fonts <<< "${extra_fonts}"
  expanded_extra_fonts=()
  for pattern in "${extra_fonts[@]}"; do
    # shellcheck disable=SC2206
    expanded=(${pattern})
    expanded_extra_fonts+=("${expanded[@]}")
  done
  extra_fonts=("${expanded_extra_fonts[@]}")

  mkdir -p "${HOME}/.local/share/fonts/"

  for f in "${extra_fonts[@]}"; do
    if [[ -z "${f}" ]]; then
      continue
    fi

    info "Install font ${f}"
    cp -r "${f}" "${HOME}/.local/share/fonts/"
  done

  fc-cache -fv
fi

if [[ -n "${pre_compile}" ]]; then
  info "Run pre compile commands"
  eval "${pre_compile}"
fi

for f in "${root_file[@]}"; do
  if [[ -z "${f}" ]]; then
    continue
  fi

  if [[ "${work_in_root_file_dir}" = "true" ]]; then
    pushd "$(dirname "${f}")" > /dev/null
    f="$(basename "${f}")"
    info "Compile ${f} in ${PWD}"
  else
    info "Compile ${f}"
  fi

  if [[ ! -f "${f}" ]]; then
    error "File '${f}' cannot be found from the directory '${PWD}'."
  fi

  "${compiler}" "${args[@]}" "${f}" || ret="$?"
  if [[ "${ret}" -ne 0 ]]; then
    if [[ "${continue_on_error}" = "true" ]]; then
      warn "Compile ${f} failed with exit_code ${ret}. However, we will continue since 'continue-on-error' is enabled."
    else
      exit "${ret}"
    fi
  fi

  if [[ "${work_in_root_file_dir}" = "true" ]]; then
    popd > /dev/null
  fi
done

if [[ -n "${post_compile}" ]]; then
  info "Run post compile commands"
  eval "${post_compile}"
fi