/+
- Name: Spine, Doc Reform [a part of]
  - Description: documents, structuring, processing, publishing, search
    - static content generator

  - Author: Ralph Amissah
    [ralph.amissah@gmail.com]

  - Copyright: (C) 2015 - 2022 Ralph Amissah, All Rights
    Reserved.

  - License: AGPL 3 or later:

    Spine (SiSU), a framework for document structuring, publishing and
    search

    Copyright (C) Ralph Amissah

    This program is free software: you can redistribute it and/or modify it
    under the terms of the GNU AFERO General Public License as published by the
    Free Software Foundation, either version 3 of the License, or (at your
    option) any later version.

    This program is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
    more details.

    You should have received a copy of the GNU General Public License along with
    this program. If not, see [https://www.gnu.org/licenses/].

    If you have Internet connection, the latest version of the AGPL should be
    available at these locations:
    [https://www.fsf.org/licensing/licenses/agpl.html]
    [https://www.gnu.org/licenses/agpl.html]

  - Spine (by Doc Reform, related to SiSU) uses standard:
    - docReform markup syntax
      - standard SiSU markup syntax with modified headers and minor modifications
    - docReform object numbering
      - standard SiSU object citation numbering & system

  - Homepages:
    [https://www.doc_reform.org]
    [https://www.sisudoc.org]

  - Git
    [https://git.sisudoc.org/projects/?p=software/spine.git;a=summary]

+/
module doc_reform.io_out.latex;
template outputLaTeX() {
  import
    std.digest.sha,
    std.file,
    std.outbuffer,
    std.uri,
    std.conv : to;
  import doc_reform.io_out;
  mixin InternalMarkup; // watch
  mixin spineRgxOut;
  static auto rgx = RgxO();
  mixin spineLanguageCodes;
  auto lang = Lang();
  auto paper() {
    string mm(uint mmi) {
      string _mm = format(q"┃%smm┃", mmi.to!string);
      return _mm;
    }
    struct PaperType {
      @safe auto a4() {
        struct A4 {
          auto portrait() {
            struct V {
              string       papersize     = "a4paper";
              string       orient        = "portrait";
              string       fontsize      = "11pt";
              const uint   w             = 170;
              const uint   h             = 257;
              const uint   l             = 30;
              const uint   r             = 20;
              const uint   t             = 30;
              const uint   b             = 30;
              string       width         = mm(w);
              string       height        = mm(h);
              string       margin_left   = mm(l);
              string       margin_right  = mm(r);
              string       margin_top    = mm(t);
              string       margin_bottom = mm(b);
              uint         img_px        = 450;
              bool         is_portrait   = true;
            }
            return V();
          }
          auto landscape() {
            struct H {
              string       papersize     = "a4paper";
              string       orient        = "landscape";
              string       fontsize      = "11pt";
              const uint   w             = 238;
              const uint   h             = 160;
              const uint   l             = 30;
              const uint   r             = 20;
              const uint   t             = 30;
              const uint   b             = 30;
              string       width         = mm(w);
              string       height        = mm(h);
              string       margin_left   = mm(l);
              string       margin_right  = mm(r);
              string       margin_top    = mm(t);
              string       margin_bottom = mm(b);
              uint         img_px        = 300;
              bool         is_portrait   = false;
            }
            return H();
          }
        }
        return A4();
      }
      @safe auto a5() {
        struct A5 {
          auto portrait() {
            struct V {
              string       papersize     = "a5paper";
              string       orient        = "portrait";
              string       fontsize      = "11pt";
              const uint   w             = 112;
              const uint   h             = 162;
              const uint   l             = 30;
              const uint   r             = 20;
              const uint   t             = 30;
              const uint   b             = 30;
              string       width         = mm(w);
              string       height        = mm(h);
              string       margin_left   = mm(l);
              string       margin_right  = mm(r);
              string       margin_top    = mm(t);
              string       margin_bottom = mm(b);
              uint         img_px        = 280;
              bool         is_portrait   = true;
            }
            return V();
          }
          auto landscape() {
            struct H {
              string       papersize     = "a5paper";
              string       orient        = "landscape";
              string       fontsize      = "11pt";
              const uint   w             = 152;
              const uint   h             = 100;
              const uint   l             = 30;
              const uint   r             = 20;
              const uint   t             = 30;
              const uint   b             = 30;
              string       width         = mm(w);
              string       height        = mm(h);
              string       margin_left   = mm(l);
              string       margin_right  = mm(r);
              string       margin_top    = mm(t);
              string       margin_bottom = mm(b);
              uint         img_px        = 190;
              bool         is_portrait   = false;
            }
            return H();
          }
        }
        return A5();
      }
      @safe auto b4() {
        struct B4 {
          auto portrait() {
            struct V {
              string       papersize     = "b4paper";
              string       orient        = "portrait";
              string       fontsize      = "11pt";
              const uint   w             = 140;
              const uint   h             = 204;
              const uint   l             = 30;
              const uint   r             = 20;
              const uint   t             = 30;
              const uint   b             = 30;
              string       width         = mm(w);
              string       height        = mm(h);
              string       margin_left   = mm(l);
              string       margin_right  = mm(r);
              string       margin_top    = mm(t);
              string       margin_bottom = mm(b);
              uint         img_px        = 356;
              bool         is_portrait   = true;
            }
            return V();
          }
          auto landscape() {
            struct H {
              string       papersize     = "b4paper";
              string       orient        = "landscape";
              string       fontsize      = "11pt";
              const uint   w             = 200;
              const uint   h             = 130;
              const uint   l             = 30;
              const uint   r             = 20;
              const uint   t             = 30;
              const uint   b             = 30;
              string       width         = mm(w);
              string       height        = mm(h);
              string       margin_left   = mm(l);
              string       margin_right  = mm(r);
              string       margin_top    = mm(t);
              string       margin_bottom = mm(b);
              uint         img_px        = 260;
              bool         is_portrait   = false;
            }
            return H();
          }
        }
        return B4();
      }
      @safe auto letter() {
        struct Letter {
          auto portrait() {
            struct V {
              string       papersize     = "letterpaper";
              string       orient        = "portrait";
              string       fontsize      = "11pt";
              const uint   w             = 166;
              const uint   h             = 212;
              const uint   l             = 30;
              const uint   r             = 20;
              const uint   t             = 30;
              const uint   b             = 30;
              string       width         = mm(w);
              string       height        = mm(h);
              string       margin_left   = mm(l);
              string       margin_right  = mm(r);
              string       margin_top    = mm(t);
              string       margin_bottom = mm(b);
              uint         img_px        = 468;
              bool         is_portrait   = true;
            }
            return V();
          }
          auto landscape() {
            struct H {
              string       papersize     = "letterpaper";
              string       orient        = "landscape";
              string       fontsize      = "11pt";
              const uint   w             = 226;
              const uint   h             = 166;
              const uint   l             = 30;
              const uint   r             = 20;
              const uint   t             = 30;
              const uint   b             = 30;
              string       width         = mm(w);
              string       height        = mm(h);
              string       margin_left   = mm(l);
              string       margin_right  = mm(r);
              string       margin_top    = mm(t);
              string       margin_bottom = mm(b);
              uint         img_px        = 290;
              bool         is_portrait   = false;
            }
            return H();
          }
        }
        return Letter();
      }
      @safe auto legal() {
        struct Legal {
          auto portrait() {
            struct V {
              string       papersize     = "legalpaper";
              string       orient        = "portrait";
              string       fontsize      = "11pt";
              const uint   w             = 168;
              const uint   h             = 286;
              const uint   l             = 30;
              const uint   r             = 20;
              const uint   t             = 30;
              const uint   b             = 30;
              string       width         = mm(w);
              string       height        = mm(h);
              string       margin_left   = mm(l);
              string       margin_right  = mm(r);
              string       margin_top    = mm(t);
              string       margin_bottom = mm(b);
              uint         img_px        = 474;
              bool         is_portrait   = true;
            }
            return V();
          }
          auto landscape() {
            struct H {
              string       papersize     = "legalpaper";
              string       orient        = "landscape";
              string       fontsize      = "11pt";
              const uint   w             = 296;
              const uint   h             = 166;
              const uint   l             = 30;
              const uint   r             = 20;
              const uint   t             = 30;
              const uint   b             = 30;
              string       width         = mm(w);
              string       height        = mm(h);
              string       margin_left   = mm(l);
              string       margin_right  = mm(r);
              string       margin_top    = mm(t);
              string       margin_bottom = mm(b);
              uint         img_px        = 420;
              bool         is_portrait   = false;
            }
            return H();
          }
        }
        return Legal();
      }
    }
    return PaperType();
  }
  @safe 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;
  }
  @safe 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;
  }
  @safe 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;
  }
  @safe string leading_hardspaces()(
    string      _txt,
  ) {
    string hardspaces(string _spaces) {
      _spaces  = _spaces
        .replaceAll(rgx.space, "{\\s}");
      return _spaces;
    }
    _txt = replaceAll!(m => hardspaces(m[0]))(_txt, rgx.spaces_line_start);
    return _txt;
  }
  @safe string nbsp_char()(string _txt) {
    if (_txt.match(rgx.nbsp_char)) {
      foreach (m; _txt.matchAll(rgx.nbsp_chars)) {
        int spaces_ = 0;
        foreach (n; m[0].matchAll(rgx.nbsp_char)) {
          spaces_ ++;
        }
        _txt = _txt.replaceFirst(rgx.nbsp_chars, "\\spaces{" ~ spaces_.to!string ~ "}");
      }
    }
    return _txt;
  }
  @safe string spaces_to_nbsp()(string _txt) {
    if (_txt.match(rgx.spaces_keep)) {
      foreach (m; _txt.matchAll(rgx.spaces_keep)) {
        int spaces_ = 0;
        foreach (n; m[0].matchAll(rgx.space)) {
          spaces_ ++;
        }
        _txt = _txt.replaceFirst(rgx.spaces_keep, "\\spaces{" ~ spaces_.to!string ~ "}");
      }
    }
    return _txt;
  }
  @safe string nbsp_char_to_space()(string _txt) {
    if (_txt.match(rgx.nbsp_char)) {
      _txt  = _txt.replaceAll(rgx.nbsp_char, " ");
    }
    return _txt;
  }
  @safe 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]), " \\br\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))) // url link (regular link with url)
            ? format(q"┃\linkurl{%s}{%s}┃", _check_link(m[1]), (_check_link(m[1])).sp_char_esc_txt)
            : ((m[2].match(rgx.uri)) && (m[1].match(rgx.inline_image_info))) // linked image
              ? format(q"┃%s\href{%s}%s{%s}┃", "\\br ", _check_link(m[2]), "\n", _if_images(m[1])) // markup for images
              : (m[2].match(rgx.uri)) // not linked image
                ? format(q"┃%s\linktext{%s}{%s}┃", "\\br ", _check_link(m[2]), m[1]) // regular link with text
                : format(q"┃\hyperlink{%s}{%s}┃", _check_link(m[2]), _if_images(m[1])) // internal links, like book index
          )(_txt, rgx.inline_link);
      }
    }
    return _txt;
  }
  @safe 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.split(rgx.br_linebreaks).join("\\br ").replaceAll(rgx.inline_notes_al_regular_number_note,
        format(_tex_note,
          "$1", "$1", "$1",
          "$2".strip
        ).strip
      );
    }
    return _txt;
  }
  @safe string remove_footnotes()(
    string      _txt,
  ) {
    if (_txt.match(rgx.inline_notes_al_gen)) {
      _txt = replaceAll!(m => "")(_txt, rgx.inline_notes_al_gen);
    }
    return _txt;
  }
  @safe string para(O)(
    string      _txt,
    O           obj,
  ) {
    if (obj.metainfo.is_of_type == "para") {
      string _tex_para;
      _tex_para = q"┃\ocn{%s}%s┃";
      _txt  = format(_tex_para,
        obj.metainfo.object_number,
        _txt.footnotes
      ).strip;
    }
    return _txt;
  }
  @safe 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\\brln\n"
      );
    }
    return _txt;
  }
  @safe string heading(O,M)(
    string      _txt,
    O           obj,
    M           doc_matters,
    string      paper_size_orientation,
    string      _part = ""
  ) {
    struct latexMarks {
      string pg_break = "\\clearpage\n";
    }
    latexMarks manual_breaks(
      latexMarks _ltx,
      string     test_for_break_level,
    ) {
      if ((!(doc_matters.conf_make_meta.make.breaks.empty)
        && (matchFirst(doc_matters.conf_make_meta.make.breaks, test_for_break_level)))
      ) {                                                                      // manually override defaults
        if ((matchFirst(doc_matters.conf_make_meta.make.breaks, rgx.make_breakpage))
          && (matchFirst(doc_matters.conf_make_meta.make.breaks, rgx.make_breakcolumn))
        ) {
          if (auto m = matchFirst(doc_matters.conf_make_meta.make.breaks, rgx.make_breakpage)) {
            if (matchFirst(m.captures["breakpage"], test_for_break_level)) {
              _ltx.pg_break = "\\clearpage\n";
            } else if (auto n = matchFirst(doc_matters.conf_make_meta.make.breaks, rgx.make_breakcolumn)) {
              if (matchFirst(n.captures["breakcolumn"], test_for_break_level)) {
                if ((paper_size_orientation == "a4.landscape")
                  || (paper_size_orientation == "b4.landscape")
                  || (paper_size_orientation == "a5.landscape")
                  || (paper_size_orientation == "letter.landscape")
                  || (paper_size_orientation == "legal.landscape")
                ) {
                  _ltx.pg_break = "\\\\ \\columnbreak\n"; // "\\\\ \\newpage\n";
                } else { // portrait
                  _ltx.pg_break = "\\clearpage\n";
                }
              }
            }
          }
        } else if (auto m = matchFirst(doc_matters.conf_make_meta.make.breaks, rgx.make_breakpage)) {
          if (matchFirst(m.captures["breakpage"], test_for_break_level)) {
            _ltx.pg_break = "\\clearpage\n";
          }
        } else if (auto m = matchFirst(doc_matters.conf_make_meta.make.breaks, rgx.make_breakcolumn)) {
          if (matchFirst(m.captures["breakcolumn"], test_for_break_level)) {
            if ((paper_size_orientation == "a4.landscape")
              || (paper_size_orientation == "b4.landscape")
              || (paper_size_orientation == "a5.landscape")
              || (paper_size_orientation == "letter.landscape")
              || (paper_size_orientation == "legal.landscape")
            ) {
              _ltx.pg_break = "\\\\ \\columnbreak\n"; // "\\\\ \\newpage\n";
            } else { // portrait
              _ltx.pg_break = "\\clearpage\n";
            }
          }
        }
      } else if (!(doc_matters.conf_make_meta.make.breaks.empty)) {
        _ltx.pg_break = "";
      }
      return _ltx;
    }
    if (obj.metainfo.is_a == "heading") {
      string _tex_para;
      latexMarks _ltx = latexMarks();
      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\\br\n\\begin{multicols}{2}";
        if (doc_matters.conf_make_meta.make.doc_type == "article") {             // defaults for article
          _ltx.pg_break = "";
        } else if (doc_matters.conf_make_meta.make.doc_type == "book") {         // defaults for book
          _ltx.pg_break = "\\clearpage\n";
        } else {
          _ltx.pg_break = "\\clearpage\n";
        }
        _ltx = manual_breaks(_ltx, "1");
        _pg_break = _ltx.pg_break;
        _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 = " \\br\n";
        _title_add = "";
        goto default;
      case 6: // 3 == subsubsection
        _pg_break = "";
        // _pg_break = "newpage"; // doubt this is necessary
        _sect = "subsubsection";
        _post = " \\br\n";
        _title_add = "";
        goto default;
      case 7: // 4 == paragraph
        _pg_break = "";
        // _pg_break = "newpage"; // doubt this is necessary
        _sect = "paragraph";
        _post = " \\br\n";
        _title_add = "";
        goto default;
      case 8: // 5 == subparagraph
        _pg_break = "";
        // _pg_break = "newpage"; // doubt this is necessary
        _sect = "subparagraph";
        _post = " \\br\n";
        _title_add = "";
        goto default;
      default:
        if (obj.metainfo.heading_lev_markup == 0) {
          _tex_para = q"┃\begin{document}
\DeclareTOCStyleEntry[numwidth+=8pt]{part}{part}
\DeclareTOCStyleEntry[numwidth+=4pt]{section}{section}
\DeclareTOCStyleEntry[numwidth+=3pt]{section}{paragraph}
\DeclareTOCStyleEntry[numwidth+=3pt]{section}{subparagraph}
\DeclareTOCStyleEntry[numwidth+=3pt]{section}{subsection}
\DeclareTOCStyleEntries[indent+=4pt]{section}{section,subsection,subsubsection}
\DeclareTOCStyleEntries[numwidth+=3pt]{section}{paragraph,subparagraph}
\RedeclareSectionCommand[%%
  style=section,
  level=0,
  indent=\z@,
  beforeskip=-3.5ex \@plus -1ex \@minus -.2ex,
  afterskip=2.3ex \@plus.2ex,
  tocindent=0pt,
  tocnumwidth=1.5em
  ]{part}
\RedeclareSectionCommands[%%
  tocnumwidth+=4pt,
  tocindent+=4pt,
  style=section,
  beforeskip=-0pt,
  afterskip=4pt,
  afterindent=false,
  indent=0pt]{section,subsection,subsubsection}
\RedeclareSectionCommands[%%
  beforeskip=-10pt plus -2pt minus -1pt,
  afterskip=1sp plus -1sp minus 1sp,
  font=\normalfont\itshape,
  indent=0pt]{paragraph,subparagraph}
\title{%s}
\author{ \textnormal{%s}}
\date{\begin{tiny}%s\end{tiny}}
\thispagestyle{empty}
\maketitle
\pagestyle{fancy}
\newpage
\pagenumbering{alph}
\setcounter{page}{1}
\markboth{%s}{%s}
\br\linebreak Copyright {\begin{small}{\copyright\end{small}} %s \br\linebreak
%s
\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) {
          if (!(_txt.footnotes.strip == "Endnotes")) {
            _tex_para = q"┃%s\part*{\ocn{%s}%s}
\addcontentsline{toc}{part}{%s}
\markboth{%s}┃";
            _txt = format(_tex_para,
              _pg_break,
              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{arabic}
\setcounter{page}{1}
\markboth{ }{ }
\part*{\ocn{1}%s \newline %s}

\clearpage
\pagenumbering{roman}
\setcounter{page}{1}
\renewcommand{\contentsname}{}
\tableofcontents

\clearpage
\pagenumbering{arabic}
\setcounter{page}{2}
\clearpage
\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_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*{\ocn{%s}%s}
\addcontentsline{toc}{%s}{%s%s}%s%s┃";
            _txt = format(_tex_para,
              _pg_break,
              _sect.strip,
              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*{\ocn{%s}%s}
\addcontentsline{toc}{%s}{%s%s}%s┃";
            _txt = format(_tex_para,
              _pg_break,
              _sect.strip,
              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"┃\ocn{%s}\objGroupOpen
%s
\objGroupClose
┃";
    _txt  = format(_tex_para,
      obj.metainfo.object_number,
      _txt.footnotes.split(rgx.br_line_spaced).join("\\brl{1}").strip // provides more control (more noise, not as tidy)
      // _txt.footnotes.split(rgx.br_line_spaced).join("") // this works using a line-space, looks tidy, keep ref.
    ).strip;
  }
  return _txt;
}
string block(O,M)(
  string      _txt,
  O           obj,
  M           doc_matters,
) {
  if (obj.metainfo.is_a == "block") {
    string _tex_para;
    _tex_para = q"┃\ocn{%s}\objBlockOpen
%s
\objBlockClose
┃";
    _txt = format(_tex_para,
      obj.metainfo.object_number,
      _txt.nbsp_char.footnotes.split(rgx.br_linebreaks_newlines).join("\\br\n").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"┃\ocn{%s}\objPoemVerseOpen
%s
\objPoemVerseClose
┃";
    _txt  = format(_tex_para,
      obj.metainfo.object_number,
      _txt.spaces_to_nbsp.footnotes.split(rgx.br_linebreaks_newlines).join("\\br\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"┃\ocn{%s}\begin{objCodeBlock}\begin{lstlisting}
%s
\end{lstlisting}\end{objCodeBlock}
┃";
    _txt  = format(_tex_para,
      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 ~= "\\\\";
  }
  Tuple!(string, string) t = tuple(
    _table,
    _tablenote,
  );
  return t;
}
string table(O,M)(
  string      _txt,
  O           obj,
  M           doc_matters,
  string      paper_size_orientation,
) {
  if (obj.metainfo.is_a == "table") {
    auto _t = _txt.tablarize(obj);
    string _table = _t[0];
    string _t_n = _t[1];
    uint pw = 0;
    switch (paper_size_orientation) {
    case "a4.portrait":      pw = (paper.a4.portrait.w      - 20); break;
    case "a4.landscape":     pw = (paper.a4.landscape.w     - 20); break;
    case "b4.portrait":      pw = (paper.b4.portrait.w      - 20); break;
    case "b4.landscape":     pw = (paper.b4.landscape.w     - 20); break;
    case "a5.portrait":      pw = (paper.a5.portrait.w      - 20); break;
    case "a5.landscape":     pw = (paper.a5.landscape.w     - 20); break;
    case "letter.portrait":  pw = (paper.letter.portrait.w  - 20); break;
    case "letter.landscape": pw = (paper.letter.landscape.w - 20); break;
    case "legal.portrait":   pw = (paper.legal.portrait.w   - 20); break;
    case "legal.landscape":  pw = (paper.legal.landscape.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"┃\ocn{%s}\objTableOpen{%s}
%s
\objTableClose
┃";
    _txt  = format(_tex_para,
      obj.metainfo.object_number,
      _colw,
      _table,
    ).strip;
  }
  return _txt;
}
  @safe 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}%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.split(rgx.br_linebreaks_newlines).join("\\br\n")
      ).strip;
    }
    return _txt;
  }
  string latex_head(M)(
    M      doc_matters,
    string paper_size_orientation,
  ) {
    struct paperTypeLatex {
      string a4_portrait;
      string a4_landscape;
      string b4_portrait;
      string b4_landscape;
      string a5_portrait;
      string a5_landscape;
      string us_letter_portrait;
      string us_letter_landscape;
      string us_legal_portrait;
      string us_legal_landscape;
    }
    auto paper_type_latex           = paperTypeLatex();
    string _footer(M)(M doc_matters) {
      string _ft = "\\lfoot[\\textrm{\\thepage}]";
      string _ft_1 = format(q"┃{\tiny \href{%s}{%s}}┃", "https://sisudoc.org", "SiSU",);
      string _ft_2 = format(q"┃
    \cfoot{\href{%s}{%s}}┃", "https://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;
    }
  struct paperMargins {
    string portrait;
    string landscape;
  }
  auto margins           = paperMargins();
  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"┃
  colorlinks=true,
  urlcolor=black,
  filecolor=black,
  linkcolor=black,
  citecolor=black,
┃",
  );
  links.color    = format(q"┃
  colorlinks=true,
  urlcolor=myblue,    %% \href{...}{...}   external url
  filecolor=mygreen,  %% \href{...}        local file
  linkcolor=myred,    %% \href{...} and \pageref{...}
  citecolor=black,
┃",
  );
  string set_paper(P)(P paper_set,) {
    string paper_type_description;
    if (paper_set.is_portrait) {
      paper_type_description = format(q"┃
\documentclass[%s,%s,titlepage]{scrartcl}
\usepackage{geometry}
\geometry{
  %s,
  %s,
  left=%s,
  right=%s,
  top=%s,
  bottom=%s,
}┃",
        paper_set.fontsize,
        paper_set.papersize,
        paper_set.papersize,
        paper_set.orient,
        paper_set.margin_left,
        paper_set.margin_right,
        paper_set.margin_top,
        paper_set.margin_bottom,
      );
    } else {
      paper_type_description = format(q"┃
\documentclass[%s,%s,landscape,titlepage,twocolumn]{scrartcl}
\usepackage{geometry}
\geometry{
  %s,
  %s,
  left=%s,
  right=%s,
  top=%s,
  bottom=%s,
}┃",
        paper_set.fontsize,
        paper_set.papersize,
        paper_set.papersize,
        paper_set.orient,
        paper_set.margin_left,
        paper_set.margin_right,
        paper_set.margin_top,
        paper_set.margin_bottom,
      );
    }
    return paper_type_description;
  }
  string paper_size_orientation_latex;
  switch (paper_size_orientation) {
  case "a4.portrait":      paper_size_orientation_latex = set_paper(paper.a4.portrait);      break;
  case "a4.landscape":     paper_size_orientation_latex = set_paper(paper.a4.landscape);     break;
  case "b4.portrait":      paper_size_orientation_latex = set_paper(paper.b4.portrait);      break;
  case "b4.landscape":     paper_size_orientation_latex = set_paper(paper.b4.landscape);     break;
  case "a5.portrait":      paper_size_orientation_latex = set_paper(paper.a5.portrait);      break;
  case "a5.landscape":     paper_size_orientation_latex = set_paper(paper.a5.landscape);     break;
  case "letter.portrait":  paper_size_orientation_latex = set_paper(paper.letter.portrait);  break;
  case "letter.landscape": paper_size_orientation_latex = set_paper(paper.letter.landscape); break;
  case "legal.portrait":   paper_size_orientation_latex = set_paper(paper.legal.portrait);   break;
  case "legal.landscape":  paper_size_orientation_latex = set_paper(paper.legal.landscape);  break;
  default:                 paper_size_orientation_latex = paper_type_latex.a4_portrait;
  }
  string links_mono_or_color_set = links.mono.strip;
  if (
    (doc_matters.opt.action.latex_color_links)
    || (paper_size_orientation ==
      "a4.landscape" ||
      "a5.landscape" ||
      "b4.landscape" ||
      "letter.landscape" ||
      "legal.landscape")
  ){
    links_mono_or_color_set = links.mono.strip;
  }
  string _latex_head = format(q"┃%%%% spine LaTeX output
%%%% Generated by: %s
%%%% D version: %s
%s
%%%% %s %s
%s
%s
\setlength{\marginparsep}{4mm}
\setlength{\marginparwidth}{8mm}
%s
\usepackage[T1]{fontenc}
%% \usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\usepackage{newunicodechar}
\usepackage{polyglossia}
\setmainlanguage{%s}
\setotherlanguage{%s}
\setmainfont{Liberation Sans}
\setmonofont[Scale=0.85]{Liberation Mono}
\usepackage{alltt}
\usepackage{hyperref}
\hypersetup{
  pdftitle={%s},
  pdfauthor={%s},
  pdfsubject={%s},
  pdfkeywords={},         %% keywords list {} {} {},
  pdftoolbar=true,
  pdfmenubar=true,
  pdfwindowui=true,
  pdffitwindow=false,     %% window fit to page when opened
  pdfstartview={FitH},    %% fits the width of the page to the window
  pdfnewwindow=true,      %% links in new window
  plainpages=false,       %% was true
  bookmarksopen=false,
  %% colorlinks=true,
  %% urlcolor=black,
  %% filecolor=black,
  %% linkcolor=black,
  %% citecolor=black,
%s                        %% links_mono_or_color_set
}
\PassOptionsToPackage{hyphens}{url}\usepackage{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{textcomp}
\usepackage[parfill]{parskip}
\usepackage[normalem]{ulem}
\usepackage{soul}
\usepackage{longtable}
\usepackage[tc]{titlepic}
\usepackage{graphicx}
\makeatletter
\parindent{0pt}
\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[]
$\txtbullet$\hspace{\enspace}
}
{\end{list}}
\usepackage{fancyhdr}
\lhead{}
\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{\monosp}[1]{\normaltext\ttfamily\texbackslash#1}
\newcommand{\br}{\hfill\break}
\newcommand{\brl}[1]{%%
  \ifx&#1&%%
    \hfill\break
  \else
    \vspace{#1ex}
  \fi
}
\newcommand{\brln}{\hspace*{\fill}\linebreak}
\newcomand{\objBlockOpen}{
  \setlength{\parskip}{0.5ex plus0.2ex minus0.1ex}\raggedright
  \begin{footnotesize}
}
\newcomand{\objBlockClose}{%%
  \end{footnotesize}
  \setlength{\parskip}{1ex plus0.5ex minus0.2ex}
}
\newcomand{\objGroupOpen}{%%
  \setlength{\parskip}{0.5ex plus0.2ex minus0.1ex}
  \begin{footnotesize}
}
\newcomand{\objGroupClose}{%%
  \end{footnotesize}
}
\newcommand{\objPoemVerseOpen}{%%
  \setlength{\parskip}{0.1ex plus0.1ex minus0.1ex}
  \begin{footnotesize}

}
\newcommand{\objPoemVerseClose}{%%

  \end{footnotesize}
  \setlength{\parskip}{1ex plus0.5ex minus0.2ex}
  \linebreak
}
\newcommand{\parasep}{\smallskip \begin{center}*\hspace{2em}*\hspace{2em}*\end{center} \br}
\newcommand{\spaces}[1]{{\hspace*{#1ex}}}
\newcommand{\s}{\hspace*{1ex}}
\newcommand{\hardspace}{\hspace*{1ex}}
\newcommand{\-}{\hspace*{1ex}}
\newcommand{\..}{\hspace*{1ex}} %% dots trailing
\newcommand{\caret}{{\^{~}}}
\newcommand{\pipe}{{\textbar}}
\newcommand{\curlyOpen}{{}
\newcommand{\curlyClose}{}}
\newcommand{\lt}{{UseTextSymbol{OML}{<}}}
\newcommand{\gt}{{UseTextSymbol{OML}{>}}}
\newcommand{\slash}{{/}}
\newcommand{\underscore}{\_}
\newcommand{\exclaim}{\Verbatim{!}}
\newcommand{\linktext}[2]{{\href{#1}
{\ulcorner\textup{{#2}}\lrcorner}}}
\newcommand{\linkurl}[2]{{\href{#1}
{\scriptsize\ttfamily\ulcorner\textup{{#2}}\lrcorner}}}
\newcommand{\link}[2]{{\begin{scriptsize}\color{black}\urlstyle{tt}\href{#1}
{\ulcorner{#2}\lrcorner}\end{scriptsize}}}
\newcommand{\objCodeBlock}[1]{\normaltext\raggedright\small\ttfamily\texbackslash#1}
\newcommand{\objCodeOpen}{\normaltext\raggedright\small\ttfamily\texbackslash
\begin{lstlisting}
}
\newcommand{\objCodeClose}{
\end{lstlisting}
}
\newcommand{\ocn}[1]{%%
  \setlength{\parindent}{0em}
  \ifx&#1&%%
    %% #1 is empty
    \hspace{-0.5ex}{\marginpar{\begin{tiny}\end{tiny}}}
  \else
    %% #1 is nonempty
    \hspace{-0.5ex}{\marginpar{\begin{tiny}\hspace{0em}\hypertarget{#1}{#1}\end{tiny}}}
  \fi
}
\newcommand{\ocnhold}[1]{
\begin{tiny}\hspace{0mm}\end{tiny}{\marginpar{\begin{tiny}\hspace{0mm}\hypertarget{#1}{#1}\end{tiny}}}
}
\newcommand{\objCodeBlockHold}[1]{\normaltext\raggedright\small\ttfamily\texbackslash#1}
\definecolor{listinggray}{gray}{0.9}
\definecolor{lbcolor}{rgb}{0.9,0.9,0.9}
\lstset{
  backgroundcolor=\color{lbcolor},
  tabsize=4,
  rulecolor=,
  language=,
  basicstyle={\ttfamily\scriptsize},
  upquote=true,
  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},
}
\newcommand{\objTableOpen}[1]{
\setlength{\LTleft}{0pt}
\setlength{\LTright}{\fill}
\begin{tiny}
\begin{longtable}{#1}
}
\newcommand{\objTableClose}{
\end{longtable}
\end{tiny}
}
  ┃",
    doc_matters.opt.action.debug_do_latex ? "" : doc_matters.generator_program.name_and_version.strip,
    doc_matters.opt.action.debug_do_latex ? "" : doc_matters.generator_program.compiler.strip,
    doc_matters.opt.action.debug_do_latex ? "" : "", // "%%%% LaTeX output last Generated on: " ~  doc_matters.generator_program.stime.strip,
    doc_matters.generator_program.project_name.strip,
    doc_matters.generator_program.url_home.strip,
    paper_size_orientation_latex.strip,
    margins.portrait.strip,
    multicol.portrait.strip,
    lang.codes[doc_matters.src.language]["xlp"],
    "english",
    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,
    links_mono_or_color_set,
    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 paper_size_orientation,
  ) {
    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, paper_size_orientation);
              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, paper_size_orientation);
              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, paper_size_orientation);
              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, paper_size_orientation, part);
              goto default;
            case "endnote":              assert(part == "endnotes");
              /* uncomment code to reinstate endnotes in endnote section */
              // _txt = _txt.para(obj)
              //   .bullets_and_indentation(obj)
              //   .links_and_images(obj, doc_matters);
              // goto default;
              break;
            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_latex
            && doc_matters.opt.action.vox_gt1) {
              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 paper_size_orientation,
  ) {
    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,
          string paper_size_orientation,
  ) {
    auto pth_latex = spinePathsLaTeX(doc_matters);
    try {
      { /+ debug +/
        if (doc_matters.opt.action.debug_do_latex
        && doc_matters.opt.action.vox_gt1) {
          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.vox_gt0) {
        writeln(" ", pth_latex.latex_file_with_path(paper_size_orientation));
      }
      auto f = File(pth_latex.latex_file_with_path(paper_size_orientation), "w");
      f.writeln(latex_content.head);
      f.writeln(latex_content.content);
      f.writeln(latex_content.tail);
      foreach (image; doc_matters.srcs.image_list) {
        string fn_src_in = doc_matters.src.image_dir_path ~ "/" ~ image;
        string 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();
    foreach (paper_size_orientation; doc_matters.conf_make_meta.conf.set_papersize) {
      latex.head           = latex_head(doc_matters, paper_size_orientation);
      latex.content        = latex_body(doc_abstraction, doc_matters, paper_size_orientation);
      latex.tail           = latex_tail(doc_matters, paper_size_orientation);
      latex.writeOutputLaTeX(doc_matters, paper_size_orientation);
    }
  }
}