module doc_reform.io_out.latex;
template outputLaTeX() {
  import doc_reform.io_out;
  import
    std.digest.sha,
    std.file,
    std.outbuffer,
    std.uri,
    std.conv : to;
  mixin InternalMarkup; // watch
  mixin spineOutputRgxInit;
  auto rgx = Rgx();
  mixin spineLanguageCodes;
  auto lang = Lang();
      auto paper() {
        struct PaperType {
          auto a4() {
            struct A4 {
              auto portrait() {
                struct V {
                  uint w      = 160;
                  uint h      = 228;
                  uint img_px = 450;
                }
                return V();
              }
              auto landscape() {
                struct H {
                  uint w      = 238;
                  uint h      = 160;
                  uint img_px = 300;
                }
                return H();
              }
            }
            return A4();
          }
          auto a5() {
            struct A5 {
              auto portrait() {
                struct V {
                  uint w      = 112;
                  uint h      = 162;
                  uint img_px = 280;
                }
                return V();
              }
              auto landscape() {
                struct H {
                  uint w      = 152;
                  uint h      = 100;
                  uint img_px = 190;
                }
                return H();
              }
            }
            return A5();
          }
          auto b4() {
            struct B4 {
              auto portrait() {
                struct V {
                  uint w      = 140;
                  uint h      = 204;
                  uint img_px = 356;
                }
                return V();
              }
              auto landscape() {
                struct H {
                  uint w      = 200;
                  uint h      = 130;
                  uint img_px = 260;
                }
                return H();
              }
            }
            return B4();
          }
          auto letter() {
            struct Letter {
              auto portrait() {
                struct V {
                  uint w      = 166;
                  uint h      = 212;
                  uint img_px = 468;
                }
                return V();
              }
              auto landscape() {
                struct H {
                  uint w      = 226;
                  uint h      = 166;
                  uint img_px = 290;
                }
                return H();
              }
            }
            return Letter();
          }
          auto legal() {
            struct Legal {
              auto portrait() {
                struct V {
                  uint w      = 168;
                  uint h      = 286;
                  uint img_px = 474;
                }
                return V();
              }
              auto landscape() {
                struct H {
                  uint w      = 296;
                  uint h      = 166;
                  uint img_px = 420;
                }
                return H();
              }
            }
            return Legal();
          }
        }
        return PaperType();
      }
  string sp_char_esc(O)(
    string      _txt,
    const    O  obj,
  ) {
    string _unescape_sp_char_esc()(string _txt) {
      _txt = _txt
        .replaceAll(rgx.latex_special_char_escaped,
          format(q"┃%s┃", "$1"))
        .replaceAll(rgx.latex_special_char_escaped_braced,
          format(q"┃%s┃", "$1"));
      return _txt;
    }
    string _unescape_fontface_esc()(string _txt) {
      _txt = _txt.replaceAll(rgx.latex_identify_inline_fontface,
           format(q"┃%s%s┃", "$1", "$2"));
      return _txt;
    }
    if (obj.metainfo.is_a != "code") {
      _txt = replaceAll!(m => "\\" ~ m[1])(_txt, rgx.latex_special_char_for_escape);
      _txt = replaceAll!(m => "{\\" ~ m[1] ~ "}")(_txt, rgx.latex_special_char_for_escape_and_braces);
      _txt = replaceAll!(m => _unescape_sp_char_esc(m[0]))(_txt, rgx.latex_identify_inline_link);
      _txt = replaceAll!(m => _unescape_fontface_esc(m[0]))(_txt, rgx.latex_identify_inline_fontface);
    }
    return _txt;
  }
  string sp_char_esc_txt()(
    string      _txt,
  ) {
    string _unescape_sp_char_esc()(string _txt) {
      _txt = _txt
        .replaceAll(rgx.latex_special_char_escaped,
          format(q"┃%s┃", "$1"))
        .replaceAll(rgx.latex_special_char_escaped_braced,
          format(q"┃%s┃", "$1"));
      return _txt;
    }
    string _unescape_fontface_esc()(string _txt) {
      _txt = _txt.replaceAll(rgx.latex_identify_inline_fontface,
           format(q"┃%s%s┃", "$1", "$2"));
      return _txt;
    }
    _txt = replaceAll!(m => "\\" ~ m[1])(_txt, rgx.latex_special_char_for_escape);
    _txt = replaceAll!(m => "{\\" ~ m[1] ~ "}")(_txt, rgx.latex_special_char_for_escape_and_braces);
    _txt = replaceAll!(m => _unescape_sp_char_esc(m[0]))(_txt, rgx.latex_identify_inline_link);
    _txt = replaceAll!(m => _unescape_fontface_esc(m[0]))(_txt, rgx.latex_identify_inline_fontface);
    return _txt;
  }
  string fontface()(
    string      _txt,
  ) {
  _txt = _txt
    .replaceAll(rgx.inline_emphasis,    format(q"┃\begin{bfseries}%s\end{bfseries}┃", "$1"))
    .replaceAll(rgx.inline_bold,        format(q"┃\begin{bfseries}%s\end{bfseries}┃", "$1"))
    .replaceAll(rgx.inline_italics,     format(q"┃\emph{%s}┃",                        "$1"))
    .replaceAll(rgx.inline_italics,     format(q"┃\uline{%s}┃",                       "$1"))
    .replaceAll(rgx.inline_superscript, format(q"┃$$^{\textrm{%s}}$$┃",               "$1"))
    .replaceAll(rgx.inline_subscript,   format(q"┃$$_{\textrm{%s}}$$┃",               "$1"))
    .replaceAll(rgx.inline_strike,      format(q"┃\sout{%s}┃",                        "$1"))
    .replaceAll(rgx.inline_insert,      format(q"┃\uline{%s}┃",                       "$1"))
    .replaceAll(rgx.inline_mono,        format(q"┃\begin{monosp}%s\end{monosp}┃",     "$1"))
    .replaceAll(rgx.inline_italics,     format(q"┃``%s''┃",                           "$1"));
    return _txt;
  }
  string leading_hardspaces()(
    string      _txt,
  ) {
    string hardspaces(string _spaces) {
      _spaces  = _spaces
        .replaceAll(rgx.space, "\\hardspace ");
      return _spaces;
    }
    _txt = replaceAll!(m => hardspaces(m[0]))(_txt, rgx.spaces_line_start);
    return _txt;
  }
  string nbsp_char()(string _txt) {
    if (_txt.match(rgx.nbsp_char)) {
      _txt  = _txt.replaceAll(rgx.nbsp_char, "\\hardspace ");
    }
    return _txt;
  }
  string nbsp_char_to_space()(string _txt) {
    if (_txt.match(rgx.nbsp_char)) {
      _txt  = _txt.replaceAll(rgx.nbsp_char, " ");
    }
    return _txt;
  }
  string links_and_images(O,M)(
    string      _txt,
    const    O  obj,
             M  doc_matters,
  ) {
    if (obj.has.inline_links) { // TODO some images do not have inline links ... image without link
      string _width_adjust(string _width) {
        if (_width.to!int > 300) { _width = "300"; } // will need to vary max with papersize & orientation
        return _width;
      }
      string _latex_image_path(string _image_path) {
        auto pth_latex = spinePathsLaTeX(doc_matters);
        _image_path = pth_latex.latex_path_stuff ~ "/" ~ _image_path;
        return _image_path;
      }
      string _if_images(string _linked_content) {
        if (_linked_content.match(rgx.inline_image_info)) {
          _linked_content = replaceAll!(m =>
              format(q"┃\includegraphics*[width=%spt]{%s}%s┃",
                _width_adjust(m[2]), _latex_image_path(m[1]), " \\\\\n")
            )(_linked_content, rgx.inline_image_info);
        }
        return _linked_content;
      }
      string _check_link(string _link) {
        _link = _link
          .replaceFirst(rgx.latex_clean_internal_link, "")
          .replaceAll(rgx.latex_special_char_for_escape_url, "\\$1");
        return _link;
      }
      if  (obj.metainfo.is_a != "code") {
        _txt = replaceAll!(m =>
            m[1] ~ "┤" ~ to!string((obj.stow.link[m[2].to!ulong])).encode ~ "├"
          )(_txt, rgx.inline_link_number_only);
        _txt = replaceAll!(m =>
            ((m[1] == m[2]) && (m[2].match(rgx.uri)))
            ? format(q"┃\begin{scriptsize}\lefthalfcap\url{%s}\righthalfcup\end{scriptsize}┃", _check_link(m[1]))
            : (m[2].match(rgx.uri)) // ERROR
              ? format(q"┃%s\href{%s}%s{%s}┃", "\\\\\n", _check_link(m[2]), "\n", _if_images(m[1]))
              : format(q"┃\hyperlink{%s}{%s}┃", _check_link(m[2]), _if_images(m[1]))
          )(_txt, rgx.inline_link);
      }
    }
    return _txt;
  }
  string footnotes()(
    string      _txt,
  ) {
    if (_txt.match(rgx.inline_notes_al_gen)) {
      string _tex_note = q"┃\hypertarget{noteref_%s}{}\footnote[%s]{%%
  \label{note_%s}%s}┃";
      _txt = _txt.replaceAll(rgx.inline_notes_al_regular_number_note,
        format(_tex_note,
          "$1", "$1", "$1",
          "$2".strip
        ).strip
      );
    }
    return _txt;
  }
  string remove_footnotes()(
    string      _txt,
  ) {
    if (_txt.match(rgx.inline_notes_al_gen)) {
      _txt = replaceAll!(m => "")(_txt, rgx.inline_notes_al_gen);
    }
    return _txt;
  }
  string para(O)(
    string      _txt,
    O           obj,
  ) {
    if (obj.metainfo.is_of_type == "para") {
      string _tex_para;
      _tex_para = q"┃\begin{tiny}\hspace{0mm}\end{tiny}{\marginpar{\begin{tiny}\hspace{0mm}\hypertarget{%s}{%s}\end{tiny}}}%s┃";
      _txt  = format(_tex_para,
        obj.metainfo.object_number,
        obj.metainfo.object_number,
        _txt.footnotes
      ).strip;
    }
    return _txt;
  }
  string bookindex(O)(
    string      _txt,
    O           obj,
  ) {
    if (obj.metainfo.is_of_type == "para"
      && obj.metainfo.is_a == "bookindex"
    ) {
      string _tex_para;
      _tex_para = q"┃%s┃";
      _txt  = format(_tex_para,
        _txt.replaceAll(rgx.latex_clean_bookindex_linebreak, "\n") ~ "\n\\\\\n"
      );
    }
    return _txt;
  }
  string heading(O,M)(
    string      _txt,
    O           obj,
    M           doc_matters,
    string      _part = ""
  ) {
    if (obj.metainfo.is_a == "heading") {
      string _tex_para;
      string _pg_break;
      string _sect;
      string _post;
      string _title_add;
      string _columns = "";
      switch (obj.metainfo.heading_lev_markup) {
      case 0: // A == TITLE
        _pg_break = "\\begin{document}\n";
        goto default;
      case 1: // B == part: section heading level
        _pg_break = "\\clearpage\n";
        goto default;
      case 2: // C == part: section heading level
        _pg_break = "\\clearpage\n";
        goto default;
      case 3: // D == part: section heading level
        _pg_break = "\\clearpage\n";
        goto default;
      case 4: // 1 == section
        _columns = (_part != "bookindex")
          ? "" : "\n\\\\\n\\begin{multicols}{2}";
        _pg_break = "\\clearpage\n";
        _sect = "section";
        _post = "";
        _title_add = format(q"┃
\markboth{%s}{%s}┃",
          doc_matters.conf_make_meta.meta.title_full,
          doc_matters.conf_make_meta.meta.title_full,
        );
        goto default;
      case 5: // 2 == subsection
        _pg_break = "";
        // _pg_break = "newpage"; // doubt this is necessary
        _sect = "subsection";
        _post = " \\\n";
        _title_add = "";
        goto default;
      case 6: // 3 == subsubsection
        _pg_break = "";
        // _pg_break = "newpage"; // doubt this is necessary
        _sect = "subsubsection";
        _post = " \\\n";
        _title_add = "";
        goto default;
      default:
        if (obj.metainfo.heading_lev_markup == 0) {
          _tex_para = q"┃\begin{document}
\title{%s}
\author{ \textnormal{%s}}
\date{\begin{tiny}%s\end{tiny}}
\pagenumbering{roman}\maketitle
\pagestyle{fancy}
\newpage
\markboth{%s}{%s}
\\\\[3]\ \linebreak Copyright {\begin{small}{\copyright\end{small}} %s \\
%s
\pagestyle{fancy}
\clearpage┃";
          _txt = format(_tex_para,
            (doc_matters.conf_make_meta.meta.title_full).sp_char_esc_txt,
            (doc_matters.conf_make_meta.meta.creator_author).sp_char_esc_txt,
            (doc_matters.conf_make_meta.meta.date_published).sp_char_esc_txt,
            (doc_matters.conf_make_meta.meta.title_main).sp_char_esc_txt,
            (doc_matters.conf_make_meta.meta.title_full).sp_char_esc_txt,
            (doc_matters.conf_make_meta.meta.rights_copyright).sp_char_esc_txt,
            (doc_matters.conf_make_meta.meta.rights_license).sp_char_esc_txt,
          );
        } else if (obj.metainfo.heading_lev_markup < 4) {
          _tex_para = q"┃%s\part*{\begin{tiny}\hspace{0mm}\end{tiny}{\marginpar{\begin{tiny}\hspace{0mm}\hypertarget{%s}{%s}\end{tiny}}}%s}
\addcontentsline{toc}{part}{%s}
\markboth{%s}┃";
          _txt = format(_tex_para,
            _pg_break,
            obj.metainfo.object_number,
            obj.metainfo.object_number,
            _txt.strip.footnotes,
            _txt.strip.remove_footnotes,
            (doc_matters.conf_make_meta.meta.title_main).sp_char_esc_txt,
          );
        } else if (obj.metainfo.heading_lev_markup > 3) {
          if (obj.metainfo.heading_lev_markup == 4
          && _txt.match(regex(r"^Table of Contents$"))) {
            _tex_para = q"┃
\pagenumbering{none}
\setcounter{page}{1}
\setlength{\parskip}{1ex plus0.5ex minus0.2ex}
\part*{\begin{tiny}\hspace{0mm}\end{tiny}{\marginpar{\begin{tiny}\hspace{0mm}\hypertarget{1}{1}\end{tiny}}}%s \newline %s}

\clearpage
\markboth{%s}{%s}
\pagenumbering{gobble}
\renewcommand{\contentsname}{}
\tableofcontents
\markboth{%s}{%s}

\clearpage
\pagenumbering{arabic}
\setcounter{page}{1}
\markboth{%s}{%s}
%% \null
\clearpage
\setcounter{page}{1}┃";
            _txt = format(_tex_para,
              (doc_matters.conf_make_meta.meta.title_full).sp_char_esc_txt,
              (doc_matters.conf_make_meta.meta.creator_author).sp_char_esc_txt,
              (doc_matters.conf_make_meta.meta.title_main).sp_char_esc_txt,
              (doc_matters.conf_make_meta.meta.title_main).sp_char_esc_txt,
              (doc_matters.conf_make_meta.meta.title_full).sp_char_esc_txt,
              (doc_matters.conf_make_meta.meta.title_full).sp_char_esc_txt,
              (doc_matters.conf_make_meta.meta.title_full).sp_char_esc_txt,
              (doc_matters.conf_make_meta.meta.title_full).sp_char_esc_txt,
            );
          } else if (obj.metainfo.heading_lev_markup == 4
            && _part == "bookindex"
            && _txt.match(regex(r"^Index$"))
          ) {
            _tex_para = q"┃%s\%s*{\begin{tiny}\hspace{0mm}\end{tiny}{\marginpar{\begin{tiny}\hspace{0mm}\hypertarget{%s}{%s}\end{tiny}}}%s}
\addcontentsline{toc}{%s}{%s%s}%s%s┃";
            _txt = format(_tex_para,
              _pg_break,
              _sect.strip,
              obj.metainfo.object_number,
              obj.metainfo.object_number,
              _txt.footnotes.strip,
              _sect,
              _txt.remove_footnotes.strip,
              _post,
              _title_add,
              _columns,
            );
          } else if (obj.metainfo.dummy_heading
            && obj.metainfo.heading_lev_markup == 4
          ) { /+ dummy headings completely omitted +/
            _txt = "";
          } else {
            _tex_para = q"┃%s\%s*{\begin{tiny}\hspace{0mm}\end{tiny}{\marginpar{\begin{tiny}\hspace{0mm}\hypertarget{%s}{%s}\end{tiny}}}%s}
\addcontentsline{toc}{%s}{%s%s}%s┃";
            _txt = format(_tex_para,
              _pg_break,
              _sect.strip,
              obj.metainfo.object_number,
              obj.metainfo.object_number,
              _txt.footnotes.strip,
              _sect,
              _txt.remove_footnotes.strip,
              _post,
              _title_add,
            );
          }
        }
        break;
      }
    }
    return _txt.strip;
  }
string group(O,M)(
  string      _txt,
  O           obj,
  M           doc_matters,
) {
  if (obj.metainfo.is_a == "group") {
    string _tex_para;
    _tex_para = q"┃\begin{tiny}\hspace{0mm}\end{tiny}{\marginpar{\begin{tiny}\hspace{0mm}\hypertarget{%s}{%s}\end{tiny}}}\setlength{\parskip}{0.5ex plus0.2ex minus0.1ex}
\begin{footnotesize}
%s
\end{footnotesize}
┃";
    _txt  = format(_tex_para,
      obj.metainfo.object_number,
      obj.metainfo.object_number,
      _txt.footnotes.strip
    ).strip;
  }
  return _txt;
}
string block(O,M)(
  string      _txt,
  O           obj,
  M           doc_matters,
) {
  if (obj.metainfo.is_a == "block") {
    // _txt = _txt.nbsp_char;
    string _tex_para;
    _tex_para = q"┃\begin{tiny}\hspace{0mm}\end{tiny}{\marginpar{\begin{tiny}\hspace{0mm}\hypertarget{%s}{%s}\end{tiny}}}\setlength{\parskip}{0.5ex plus0.2ex minus0.1ex}
\begin{footnotesize}
%s
\end{footnotesize}
\setlength{\parskip}{1ex plus0.5ex minus0.2ex}
┃"; // \hardspace
    /+ try both: +/
    _txt = _txt.split(rgx.br_newlines_linebreaks).join("\n\n"); // _txt = _txt.split(rgx.br_newlines_linebreaks).join(" \\\n");
    _txt  = format(_tex_para,
      obj.metainfo.object_number,
      obj.metainfo.object_number,
      _txt.nbsp_char.footnotes.strip
    ).strip;
  }
  return _txt;
}
string verse(O,M)(
  string      _txt,
  O           obj,
  M           doc_matters,
) {
  if (obj.metainfo.is_a == "verse") {
    string _tex_para;
    _tex_para = q"┃\begin{tiny}\hspace{0mm}\end{tiny}{\marginpar{\begin{tiny}\hspace{0mm}\hypertarget{%s}{%s}\end{tiny}}}\setlength{\parskip}{0.1ex plus0.1ex minus0.1ex}
\begin{footnotesize}

%s

\end{footnotesize}
\setlength{\parskip}{1ex plus0.5ex minus0.2ex}
\linebreak
┃"; // \hardspace
    _txt  = format(_tex_para,
      obj.metainfo.object_number,
      obj.metainfo.object_number,
      _txt.nbsp_char.footnotes.split("\n").join("\n\n").strip
    ).strip;
  }
  return _txt;
}
string codeblock(O,M)(
  string      _txt,
  O           obj,
  M           doc_matters,
) {
  if (obj.metainfo.is_a == "code") {
    string _tex_para;
    _tex_para = q"┃\begin{tiny}\hspace{0mm}\end{tiny}{\marginpar{\begin{tiny}\hspace{0mm}\hypertarget{%s}{%s}\end{tiny}}}\setlength{\parskip}{0.5ex plus0.2ex minus0.1ex}\begin{Codeblock}
\begin{lstlisting}
%s
\end{lstlisting}
\end{Codeblock}
\setlength{\parskip}{1ex plus0.5ex minus0.2ex}
┃";
    _txt  = format(_tex_para,
      obj.metainfo.object_number,
      obj.metainfo.object_number,
      _txt.nbsp_char_to_space
    ).strip;
  }
  return _txt;
}
auto tablarize(O)(
  string            _txt,
  const        O    obj,
) {
  string[] _table_rows = (_txt).split(rgx.table_delimiter_row);
  string[] _table_cols;
  string _table;
  string _tablenote;
  foreach(row_idx, row; _table_rows) {
    _table_cols = row.split(rgx.table_delimiter_col);
      _table ~= "";
      foreach(col_idx, cell; _table_cols) {
        if ((_table_cols.length == 1)
        && (_table_rows.length <= row_idx+2)) { // check row_idx+2 (rather than == ++row_idx)
          _tablenote ~= cell;
        } else {
          // // _table ~= "\\bfseries ";
          // _table ~= cell;
          // _table ~= (_table_cols.length > (col_idx + 1)) ? "&" : "";
          _table ~= format(q"┃%s%s┃",
            cell,
            (_table_cols.length > (col_idx + 1)) ? "&" : ""
          );
        }
      }
      _table ~= "\\\\";
    }
  auto t = tuple(
    _table,
    _tablenote,
  );
  return t;
}
string table(O,M)(
  string      _txt,
  O           obj,
  M           doc_matters,
) {
  if (obj.metainfo.is_a == "table") {
    auto _t = _txt.tablarize(obj);
    string _table = _t[0];
    string _t_n = _t[1];
    string papertype = "a4";
    uint pw = 0;
    switch (papertype) {
    case "a4":     pw = (paper.a4.portrait.w     - 20); break;
    case "a5":     pw = (paper.a5.portrait.w     - 20); break;
    case "b4":     pw = (paper.b4.portrait.w     - 20); break;
    case "letter": pw = (paper.letter.portrait.w - 20); break;
    case "legal":  pw = (paper.legal.portrait.w  - 20); break;
    default:       pw = 0;                              break;
    }
    // auto textwidth = (pw - 24);
    string _colw = "";
    foreach (w; obj.table.column_widths) {
      _colw ~= format(q"┃p{%.0fmm}┃",
        (w * pw / 100)
        // (w * (pw - 24)/ 100)
        // (w * textwidth / 100)
      );
    }
    string _tex_para;
    _tex_para = q"┃\begin{tiny}\hspace{0mm}\end{tiny}{\marginpar{\begin{tiny}\hspace{0mm}\hypertarget{%s}{%s}\end{tiny}}}
\setlength{\LTleft}{0pt}
\setlength{\LTright}{\fill}
\begin{tiny}
\begin{longtable}{%s}
%s
\end{longtable}
\end{tiny}
┃";
    _txt  = format(_tex_para,
      obj.metainfo.object_number,
      obj.metainfo.object_number,
      _colw,
      _table,
    ).strip;
  }
  return _txt;
}
  string bullets_and_indentation(O)(
    string      _txt,
    O           obj,
  ) {
    string _tex_para;
    string _hang; string _indent;
    int _paper_margin = -10;
    int _indent_increment = 8; // 5; 10;
    if (obj.attrib.bullet) {
      int _bullet_space = 5;
      _indent = ((obj.attrib.indent_base * _indent_increment) + _paper_margin + _bullet_space).to!string;
      _txt  = format(q"┃\begin{Bullet}{%smm}$\txtbullet$\hspace{\enspace}%s\end{Bullet}┃",
        _indent,
        _txt.footnotes
      ).strip;
    } else if (
      obj.attrib.indent_base != 0
      && obj.attrib.indent_base == obj.attrib.indent_hang
    ) {
      _indent = ((obj.attrib.indent_base * _indent_increment) + _paper_margin).to!string;
      _tex_para = q"┃\begin{ParagraphIndent}{%smm}%s \end{ParagraphIndent}┃";
      _txt = format(_tex_para,
        _indent,
        _txt.footnotes
      ).strip;
    } else if (
      obj.attrib.indent_base != 0
      || obj.attrib.indent_hang != 0
    ) {
      _indent = ((obj.attrib.indent_base * _indent_increment) + _paper_margin).to!string;
      _hang = (((obj.attrib.indent_hang - obj.attrib.indent_base) * _indent_increment)).to!string;
      _tex_para = q"┃\begin{ParagraphHang}{%smm}{%smm}%s \end{ParagraphHang}┃";
      _txt = format(_tex_para,
        _indent, _hang,
        _txt.footnotes
      ).strip;
    }
    return _txt;
  }
  string latex_head(M)(
                          M    doc_matters,
  ) {
    struct paperType {
      string a4_portrait;
      string a4_landscape;
      string us_letter_portrait;
      string us_letter_landscape;
    }
    auto paper           = paperType();
    string _footer(M)(M doc_matters) {
      string _ft = "\\lfoot[\\textrm{\\thepage}]";
      string _ft_1 = format(q"┃{\tiny \href{%s}{%s}}┃", "http://sisudoc.org", "SiSU",);
      string _ft_2 = format(q"┃
  \cfoot{\href{%s}{%s}}┃", "http://git.sisudoc.org", "git",);
      if (doc_matters.conf_make_meta.make.footer.length > 0) {
        if (doc_matters.conf_make_meta.make.footer.length > 0) {
          if (doc_matters.conf_make_meta.make.footer[0].matchAll(rgx.inline_link)) {
            _ft ~= doc_matters.conf_make_meta.make.footer[0]
              .replace(rgx.inline_link, "{\\tiny \\href{$2}{$1}}");
          } else {
            _ft ~= _ft_1;
          }
        }
        if (doc_matters.conf_make_meta.make.footer.length > 1) {
          if (doc_matters.conf_make_meta.make.footer[1].matchAll(rgx.inline_link)) {
            _ft ~= doc_matters.conf_make_meta.make.footer[1]
              .replace(rgx.inline_link, "\n\\cfoot{\\href{$2}{$1}}");
          } else {
            _ft ~= _ft_2;
          }
        }
      } else {
        _ft ~= _ft_1;
        _ft ~= _ft_2;
      }
      return _ft;
    }
    paper.a4_portrait    = format(q"┃
\documentclass[12pt,a4paper,titlepage]{scrartcl}
\setlength{\textheight}{228mm} \setlength{\textwidth}{160mm}
┃",
  );
  paper.a4_landscape    = format(q"┃
\documentclass[11pt,a4paper,landscape,titlepage,twocolumn]{scrartcl}
\setlength{\textheight}{160mm} \setlength{\textwidth}{238mm}
┃",
  );
  paper.us_letter_portrait    = format(q"┃
\documentclass[12pt,letterpaper,titlepage]{scrartcl}
\setlength{\textheight}{212mm} \setlength{\textwidth}{166mm}
┃",
  );
  paper.us_letter_landscape    = format(q"┃
\documentclass[11pt,letterpaper,landscape,titlepage,twocolumn]{scrartcl}
\setlength{\textheight}{166mm} \setlength{\textwidth}{226mm}
┃",
  );
  struct paperMargins {
    string portrait;
    string landscape;
  }
  auto margins           = paperMargins();
  margins.portrait    = format(q"┃
\setlength{\oddsidemargin}{0mm} \setlength{\evensidemargin}{0mm}
\setlength{\topmargin}{-12pt} \setlength{\headheight}{12pt}
\setlength{\headsep}{35pt}
┃",
  );
  margins.landscape    = format(q"┃
\setlength{\oddsidemargin}{6mm} \setlength{\evensidemargin}{6mm}
\setlength{\topmargin}{-12mm} \setlength{\headheight}{12pt}
\setlength{\headsep}{20pt}
┃",
  );
  struct columnsMulti {
    string portrait;
    string landscape;
  }
  auto multicol           = columnsMulti();
  multicol.portrait    = format(q"┃
\usepackage{multicol}
┃",
  );
  multicol.landscape    = "";
  struct colorLinks {
    string mono;
    string color;
  }
  auto links           = colorLinks();
  links.mono    = format(q"┃
\usepackage[xetex,
  colorlinks=true,
  urlcolor=myblack,
  filecolor=myblack,
  linkcolor=myblack,
┃",
  );
  links.color    = format(q"┃
\usepackage[xetex,
  colorlinks=true,
  urlcolor=myblue,    %% \href{...}{...}   external url
  filecolor=mygreen,  %% \href{...}        local file
  linkcolor=myred,    %% \href{...} and \pageref{...}
  ┃",
    );
    string _latex_head = format(q"┃%%%% spine LaTeX output
%%%% Generated by: %s
%%%% D version: %s
%%%% LaTeX output last Generated on: %s
%%%% %s %s

%s
%s
\setlength{\marginparsep}{4mm}
\setlength{\marginparwidth}{8mm}
%s
\usepackage{polyglossia, ucs, fontspec, xltxtra, xunicode}
\setmainlanguage{%s}
\setotherlanguage{%s}
\setmainfont{Liberation Sans}
\setmonofont[Scale=0.85]{Liberation Mono}
\usepackage{alltt}
\usepackage{thumbpdf}
%s
  pdftitle={%s},
  pdfauthor={%s},
  pdfsubject={%s},
  pdfkeywords={},
  pageanchor=true,
  plainpages=true,
  pdfpagelabels=true,
  pagebackref,
  bookmarks=true,
  bookmarksopen=true,
  pdfmenubar=true,
  pdfpagemode=UseOutline,
  pdffitwindow=true,
  pdfwindowui=true,
  plainpages=false,
  pdfstartview=FitH
]
{hyperref}
\usepackage[usenames]{color}
\definecolor{myblack}{rgb}{0,0,0}
\definecolor{myred}{rgb}{0.75,0,0}
\definecolor{mygreen}{rgb}{0,0.5,0}
\definecolor{myblue}{rgb}{0,0,0.5}
\definecolor{mywhite}{rgb}{1,1,1}
\usepackage{url}
\urlstyle{sf}
\usepackage{textcomp}
\usepackage[parfill]{parskip}
\usepackage[normalem]{ulem}
\usepackage{soul}
\usepackage{longtable}
\usepackage[tc]{titlepic}
\usepackage{graphicx}
\makeatletter
\parindent0pt
\usepackage{amssymb}
\usepackage{listings}
\usepackage{color}
\usepackage{textcomp}
\setcounter{secnumdepth}{2}
\setcounter{tocdepth}{4}
\makeatletter
\usepackage[multiple,ragged]{footmisc}
\setlength\footnotemargin{12pt}
\usepackage[para]{manyfoot}
\DeclareNewFootnote{A}
\newenvironment{ParagraphIndent}[1]%%
{
\begin{list}{}{%%
\setlength\topsep{0pt}%%
\addtolength{\leftmargin}{#1}
\setlength\parsep{0pt plus 1pt}%%
}
\item[]
}
{\end{list}}
\newenvironment{ParagraphHang}[2]%%
{
\begin{list}{}{%%
\setlength\topsep{0pt}%%
\addtolength{\leftmargin}{#1}
\itemindent=#2
\setlength\parsep{0pt plus 1pt}%%
}
\item[]
}
{\end{list}}
\newenvironment{Bullet}[1]%%
{
\begin{list}{}{%%
\setlength\topsep{0pt}%%
\addtolength{\leftmargin}{#1}
\itemindent=-1em
\setlength\parsep{0pt plus 1pt}%%
}
\item[]
}
{\end{list}}
\usepackage{fancyhdr}
\lhead{}
\renewcommand{\part}{\@startsection
  {part}{1}{-2mm}%%
  {-\baselineskip}{0.5\baselineskip}%%
  {\bfseries\large\upshape\raggedright}}
\renewcommand{\section}{\@startsection
  {section}{2}{-2mm}%%
  {-\baselineskip}{0.5\baselineskip}%%
  {\bfseries\large\upshape\raggedright}}
\renewcommand{\subsection}{\@startsection
  {subsection}{3}{-2mm}%%
  {-\baselineskip}{0.5\baselineskip}%%
  {\bfseries\large\upshape\raggedright}}
\renewcommand{\subsubsection}{\@startsection
  {subsubsection}{4}{-2mm}%%
  {-\baselineskip}{0.5\baselineskip}%%
  {\normalfont\normalsize\bfseries\raggedright}}
\renewcommand{\paragraph}{\@startsection
  {paragraph}{5}{-2mm}%%
  {-\baselineskip}{0.5\baselineskip}%%
  {\normalfont\normalsize\itshape\raggedright}}
\renewcommand{\subparagraph}{\@startsection
  {subparagraph}%%{6}%%{-2mm}%%
  {-\baselineskip}{0.5\baselineskip}%%
  {\normalfont\normalsize\itshape\raggedright}}
\selectlanguage{%s}
\lhead[ ]{ }
\chead[ \fancyplain{} \bfseries \footnotesize \leftmark ]{ \fancyplain{} \bfseries \footnotesize \rightmark }
\rhead[ ]{ }
%s
\rfoot[\tiny \href{}{}]{\textrm{\thepage}}
\tolerance=300
\clubpenalty=300
\widowpenalty=300
\makeatother
\makeatother
\chardef\txtbullet="2022
\chardef\tilde="7E
\def\asterisk{{\rm \char42} }
\definecolor{Light}{gray}{.92}
\newcommand{\Codeblock}[1]{\normaltext\raggedright\small\ttfamily\texbackslash#1}
\newcommand{\monosp}[1]{\normaltext\ttfamily\texbackslash#1}
\newcommand{\parasep}{\\ \begin{center}*\hspace{2em}*\hspace{2em}*\end{center} \\}
\newcommand{\hardspace}{{~}}
\newcommand{\caret}{{\^{~}}}
\newcommand{\pipe}{{\textbar}}
\newcommand{\curlyopen}{{}
\newcommand{\curlyclose}{}}
\newcommand{\lt}{{UseTextSymbol{OML}{<}}}
\newcommand{\gt}{{UseTextSymbol{OML}{>}}}
\newcommand{\slash}{{/}}
\newcommand{\underscore}{\_}
\newcommand{\exclaim}{\Verbatim{!}}
\definecolor{listinggray}{gray}{0.9}
\definecolor{lbcolor}{rgb}{0.9,0.9,0.9}
\lstset{
  backgroundcolor=\color{lbcolor},
  tabsize=4,
  rulecolor=,
  language=,
  basicstyle=\scriptsize,
  upquote=true,
  aboveskip={1.5\baselineskip},
  columns=fixed,
  showstringspaces=false,
  extendedchars=true,
  breaklines=true,
  prebreak = \raisebox{0ex}[0ex][0ex]{\ensuremath{\hookleftarrow}},
  frame=single,
  showtabs=false,
  showspaces=false,
  showstringspaces=false,
  identifierstyle=\ttfamily,
  keywordstyle=\color[rgb]{0,0,1},
  commentstyle=\color[rgb]{0.133,0.545,0.133},
  stringstyle=\color[rgb]{0.627,0.126,0.941},
}
  ┃",
    doc_matters.opt.action.debug_do ? "" : doc_matters.generator_program.name_and_version.strip,
    doc_matters.opt.action.debug_do ? "" : doc_matters.generator_program.compiler.strip,
    doc_matters.opt.action.debug_do ? "" : doc_matters.generator_program.stime.strip,
    doc_matters.generator_program.project_name.strip,
    doc_matters.generator_program.url_home.strip,
    paper.a4_portrait.strip,
    margins.portrait.strip,
    multicol.portrait.strip,
    lang.codes[doc_matters.src.language]["xlp"],
    "english",
    links.mono.strip, // links.color.strip,
    doc_matters.conf_make_meta.meta.title_full.strip,
    doc_matters.conf_make_meta.meta.creator_author.strip,
    doc_matters.conf_make_meta.meta.classify_subject.strip,
    lang.codes[doc_matters.src.language]["xlp"],
    _footer(doc_matters),
  );
    return _latex_head.strip;
  }
  string latex_body(D,M)(
    const    D   doc_abstraction,
             M   doc_matters,
  ) {
    string _latex_body = "";
    bool _multicolumns = false;
    string _txt;
    foreach (part; doc_matters.has.keys_seq.latex) {
      foreach (obj; doc_abstraction[part]) {
        switch (obj.metainfo.is_of_part) {
        case "frontmatter":              assert(part == "head" || "toc");
          _txt = obj.text
            .sp_char_esc(obj)
            .fontface;
          switch (obj.metainfo.is_of_type) {
          case "para":
            switch (obj.metainfo.is_a) {
            case "heading":
              _txt = _txt.heading(obj, doc_matters);
              goto default;
            case "toc":
              break;
            default:
              _latex_body ~= _txt ~ "\n\n";
              _txt = "";
              break;
            }
            break;
          default: break;
          }
          break;
        case "body":                     assert(part == "body" || "head"); // surprise
          _txt = obj.text
            .sp_char_esc(obj)
            .fontface;
          switch (obj.metainfo.is_of_type) {
          case "para":
            switch (obj.metainfo.is_a) {
            case "heading":
              _txt = _txt.heading(obj, doc_matters);
              goto default;
            case "para":
              _txt = _txt.para(obj)
                .bullets_and_indentation(obj)
                .links_and_images(obj, doc_matters);
              goto default;
            default:
              _latex_body ~= _txt ~ "\n\n";
              _txt = "";
              break;
            }
            break;
          case "block":
            switch (obj.metainfo.is_a) {
            case "quote":
              goto default; // TODO
            case "group":
              /+ (hardspaces not honored) [remove any hardspace marker] +/
              _txt = _txt.group(obj, doc_matters)
                .links_and_images(obj, doc_matters);
              goto default;
            case "block":
              /+ (hardspace honored) \hardspace +/
              _txt = _txt.block(obj, doc_matters)
                .links_and_images(obj, doc_matters);
              goto default;
            case "verse":
              /+ (hardspace honored) \hardspace +/
              _txt = _txt.verse(obj, doc_matters)
                .links_and_images(obj, doc_matters);
              goto default;
            case "code":
              /+ (hardspace honored) \begin{lstlisting} clear hardspace marker +/
              _txt = _txt.codeblock(obj, doc_matters);
              goto default;
            case "table":
              _txt = _txt.table(obj, doc_matters);
              goto default; // TODO
            default:
              _latex_body ~= _txt ~ "\n\n";
              _txt = "";
              break;
            }
            break;
          default: break;
          }
          break;
        case "backmatter":
          assert(part == "endnotes" || "glossary" || "bibliography" || "bookindex" || "blurb" || "tail");
          _txt = obj.text
            .sp_char_esc(obj)
            .fontface;
          switch (obj.metainfo.is_of_type) {
          case "para":
            if (part != "bookindex" && _multicolumns) {
              _multicolumns = false;
              _latex_body ~= "\n\\end{multicols}\n";
            }
            switch (obj.metainfo.is_a) {
            case "heading":
              if (part == "bookindex") {
                _multicolumns = true;
              }
              _txt = _txt.heading(obj, doc_matters, part);
              goto default;
            case "endnote":              assert(part == "endnotes");
              _txt = _txt.para(obj)
                .bullets_and_indentation(obj)
                .links_and_images(obj, doc_matters);
              goto default;
            case "glossary":             assert(part == "glossary");
              _txt = _txt.para(obj)
                .bullets_and_indentation(obj)
                .links_and_images(obj, doc_matters);
              goto default;
            case "bibliography":         assert(part == "bibliography");
              _txt = _txt.para(obj)
                .bullets_and_indentation(obj);
              goto default;
            case "bookindex":            assert(part == "bookindex");
              /+ two column, special section +/
              _txt = _txt.bookindex(obj)
                .links_and_images(obj, doc_matters);
              goto default;
            case "blurb":                assert(part == "blurb");
              _txt = _txt.para(obj)
                .bullets_and_indentation(obj)
                .links_and_images(obj, doc_matters);
              goto default;
            default:
              _latex_body ~= (part == "bookindex" && obj.metainfo.is_a != "heading")
                ? _txt : (_txt ~ "\n\n");
              _txt = "";
              break;
            }
            break;
          default: break;
          }
          break;
        case "comment":
          break;
        default:
          { /+ debug +/
            if (doc_matters.opt.action.debug_do
            && doc_matters.opt.action.verbose) {
              writeln(__FILE__, ":", __LINE__, ": ", obj.metainfo.is_of_part);
              writeln(__FILE__, ":", __LINE__, ": ", obj.metainfo.is_a);
              writeln(__FILE__, ":", __LINE__, ": ", obj.text);
            }
          }
          break;
        }
      }
    }
    if (_multicolumns) {
      _multicolumns = false;
      _latex_body ~= "\n\\end{multicols}\n";
    }
    return _latex_body;
  }
  string latex_tail(M)(
                          M    doc_matters,
  ) {
    string _latex_tail = format(q"┃

\end{document}
  ┃",
    // doc_matters.conf_make_meta.meta.title_full,
    // doc_matters.conf_make_meta.meta.creator_author,
  );
    return _latex_tail;
  }
  void writeOutputLaTeX(T,M)(
    const T    latex_content,
          M    doc_matters,
  ) {
    auto pth_latex = spinePathsLaTeX(doc_matters);
    try {
      { /+ debug +/
        if (doc_matters.opt.action.debug_do
        && doc_matters.opt.action.verbose) {
          writeln(latex_content.head);
          writeln(latex_content.content);
          writeln(latex_content.tail);
        }
      }
      if (!exists(pth_latex.latex_path_stuff)) {
        (pth_latex.latex_path_stuff).mkdirRecurse;
      }
      if (!(doc_matters.opt.action.quiet)) {
        writeln(" ", pth_latex.latex_file_with_path);
      }
      auto f = File(pth_latex.latex_file_with_path, "w");
      f.writeln(latex_content.head);
      f.writeln(latex_content.content);
      f.writeln(latex_content.tail);
      foreach (image; doc_matters.srcs.image_list) {
        auto fn_src_in = doc_matters.src.image_dir_path ~ "/" ~ image;
        auto fn_src_out_file = pth_latex.latex_path_stuff ~ "/" ~ image;
        if (exists(fn_src_in)) {
          fn_src_in.copy(fn_src_out_file);
        }
      }
    } catch (ErrnoException ex) {
      // handle error
    }
  }
  void outputLaTeX(D,M)(
    const    D   doc_abstraction,
             M   doc_matters,
  ) {
    struct LaTeX {
      string head;
      string content;
      string tail;
    }
    auto latex           = LaTeX();
    latex.head           = latex_head(doc_matters);
    latex.content        = latex_body(doc_abstraction, doc_matters);
    latex.tail           = latex_tail(doc_matters);
    latex.writeOutputLaTeX(doc_matters);
  }
}