rename & house utils; work on markup conversion

- new dir for markup tools
  misc/util/d/tools/markup_conversion
- start looking at tools for converting
  - endnotes from binary to inline
  - sisu.rb to sisu spine in d
  - look at conversion of document headers to yaml
    from
    - bespoke sisu headers (original .rb)
    - sdlang
    - toml

5 files changed, 743 insertions, 8 deletions

diff --git a/misc/util/d/tools/markup_conversion/README b/misc/util/d/tools/markup_conversion/README
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/misc/util/d/tools/markup_conversion/README
@@ -0,0 +1 @@
+
diff --git a/misc/util/d/tools/endnotes_inline_from_binary.d b/misc/util/d/tools/markup_conversion/endnotes_inline_from_binary.d
index 4d9ceb0..abd4e45 100755
--- a/misc/util/d/tools/endnotes_inline_from_binary.d
+++ b/misc/util/d/tools/markup_conversion/endnotes_inline_from_binary.d
@@ -29,6 +29,13 @@ import std.regex;
 import std.format;
 import std.conv;
 void main(string[] args) {
+  static comment                 = ctRegex!(`^%+ `);
+  static block_tic_code_open     = ctRegex!("^`{3} code(?:[.](?P<syntax>[a-z][0-9a-z#+_]+))?(?:[(](?P<attrib>[ a-zA-Z0-9;:,]*)[)])?");
+  static block_tic_close         = ctRegex!("^(`{3})$","m");
+  static block_curly_code_open   = ctRegex!(`^(?:code(?:[.](?P<syntax>[a-z][0-9a-z_]+))?(?:[(](?P<attrib>[ a-zA-Z0-9;:,]*)[)])?[{][ ]*$)`);
+  static block_curly_code_close  = ctRegex!(`^([}]code)`);
+  auto rgx_endnote_ref           = ctRegex!(`([~]\^)(?P<tail>[)\]]? |$)`, "gm");
+  auto rgx_endnote               = ctRegex!(`^\^~\s+(.+|\n)`, "gm");
   foreach(arg; args[1..$]) {
     if (
       !(arg.match(regex(r"--\w+")))
@@ -45,13 +52,6 @@ void main(string[] args) {
           "curly_code"                 : 0,
           "tic_code"                   : 0,
         ];
-        static comment                 = ctRegex!(`^%+ `);
-        static block_tic_code_open     = ctRegex!("^`{3} code(?:[.](?P<syntax>[a-z][0-9a-z#+_]+))?(?:[(](?P<attrib>[ a-zA-Z0-9;:,]*)[)])?");
-        static block_tic_close         = ctRegex!("^(`{3})$","m");
-        static block_curly_code_open   = ctRegex!(`^(?:code(?:[.](?P<syntax>[a-z][0-9a-z_]+))?(?:[(](?P<attrib>[ a-zA-Z0-9;:,]*)[)])?[{][ ]*$)`);
-        static block_curly_code_close  = ctRegex!(`^([}]code)`);
-        auto rgx_endnote_ref           = ctRegex!(`([~]\^)(?P<tail>[)\]]? |$)`, "gm");
-        auto rgx_endnote               = ctRegex!(`^\^~\s+(.+|\n)`, "gm");
         foreach (paragraph; paragraphs) { /+ loop to gather binary endnotes +/
           if ( !( type["curly_code"] == 1 || type["tic_code"] == 1)
             && paragraph.match(rgx_endnote)
@@ -68,7 +68,7 @@ void main(string[] args) {
             ) {
               type["tic_code"] = 0;
             } else if ( type["curly_code"] == 1 || type["tic_code"] == 1) {
-              // prevent search for endnotes
+              // skip, prevent search for endnotes
             } else if (paragraph.matchFirst(block_curly_code_open)) {
               type["curly_code"] = 1;
             } else if (paragraph.matchFirst(block_tic_code_open)) {
diff --git a/misc/util/d/tools/markup_conversion/markup_changes.d b/misc/util/d/tools/markup_conversion/markup_changes.d
new file mode 100644
index 0000000..4274f78
--- /dev/null
+++ b/misc/util/d/tools/markup_conversion/markup_changes.d
@@ -0,0 +1,136 @@
+#!/usr/bin/env rdmd
+/+
+  - read in file .sst .ssi .ssm
+  - loop twice
+    - first
+      - check for and skip code blocks
+      - use unique code marker for endnote markers in text and give an endnote
+        number ★1, increment
+      - extract all endnotes in array
+    - second
+      - check that the footnote marker number count matches the number of notes
+        in the array
+        - if they match either:
+            - substitute each endnote marker with the array footnote[number-1]
+            - substitute each endnote marker with footnote
+              as inlined footnote markup (footnote number not needed)
+        - if they do not match exit
+  - check whether changes have been made
+    - if so write file with inline footnotes in sub-directory converted_output_/
+      using the same name as the original file
+    - else, exit
++/
+import std.stdio;
+import std.file;
+import std.array : split;
+import std.exception;
+import core.stdc.errno;
+import std.regex;
+import std.format;
+import std.conv;
+void main(string[] args) {
+  static comment                 = ctRegex!(`^%+ `);
+  static block_tic_code_open     = ctRegex!("^`{3} code(?:[.](?P<syntax>[a-z][0-9a-z#+_]+))?(?:[(](?P<attrib>[ a-zA-Z0-9;:,]*)[)])?");
+  static block_tic_close         = ctRegex!("^(`{3})$","m");
+  static block_curly_code_open   = ctRegex!(`^(?:code(?:[.](?P<syntax>[a-z][0-9a-z_]+))?(?:[(](?P<attrib>[ a-zA-Z0-9;:,]*)[)])?[{][ ]*$)`);
+  static block_curly_code_close  = ctRegex!(`^([}]code)`);
+  auto rgx_endnote_ref           = ctRegex!(`([~]\^)(?P<tail>[)\]]? |$)`, "gm");
+  auto rgx_endnote               = ctRegex!(`^\^~\s+(.+|\n)`, "gm");
+  foreach(arg; args[1..$]) {
+    if (
+      !(arg.match(regex(r"--\w+")))
+      && arg.match(regex(r"\w+?\.ss[itm]"))
+    ) {
+      writeln(arg);
+      string filename                  = arg;
+      try {
+        string[] contents, endnotes, endnote_refs;
+        string text                    = filename.readText;
+        string[] paragraphs            = text.split("\n\n");
+        int endnote_ref_count          = 0;
+        int[string] type = [
+          "curly_code"                 : 0,
+          "tic_code"                   : 0,
+        ];
+        foreach (paragraph; paragraphs) { /+ loop to gather binary endnotes +/
+          if ( !( type["curly_code"] == 1 || type["tic_code"] == 1)
+            && paragraph.match(rgx_endnote)
+          ) {
+            endnotes ~= replaceAll!(m => m[1])
+              (paragraph, rgx_endnote);
+          } else {
+            if ( type["curly_code"] == 1 || type["tic_code"] == 1
+              || paragraph.matchFirst(block_curly_code_open)
+              || paragraph.matchFirst(block_tic_code_open)
+            ) { /+ code blocks identified, no munging +/
+              if ( type["curly_code"] == 1
+                && paragraph.matchFirst(block_curly_code_close)
+              ) {
+                type["curly_code"] = 0;
+              } else if (type["tic_code"] == 1
+                && paragraph.matchFirst(block_tic_close)
+              ) {
+                type["tic_code"] = 0;
+              } else if (paragraph.matchFirst(block_curly_code_open)) {
+                type["curly_code"] = 1;
+              } else if (paragraph.matchFirst(block_tic_code_open)) {
+                type["tic_code"] = 1;
+              }
+              contents ~= paragraph;
+            } else { /+ regular content, not a code block +/
+              if (auto m = paragraph.matchAll(rgx_endnote_ref)) {
+                foreach (n; m) {
+                  endnote_ref_count++; // endnote_refs ~= (n.captures[1]);
+                }
+              }
+              paragraph = replaceAll!(m => " \\\\ " )
+                (paragraph, regex(r"\s*<(?:/\s*|:)?br>\s*")); // (paragraph, regex(r"(<br>)"));
+              contents ~= paragraph;
+            }
+          }
+        }
+        {
+          import std.outbuffer;
+          auto buffer = new OutBuffer();
+          if (endnotes.length == endnote_ref_count) {
+            // writeln("endnote ref count:         ", endnote_ref_count);
+            // writeln("number of binary endnotes: ", endnotes.length);
+            int endnote_count = -1;
+            foreach (content; contents) { /+ loop to inline endnotes +/
+              content = replaceAll!(m => "~{ " ~ endnotes[++endnote_count] ~ " }~" ~ m["tail"] )
+                (content, rgx_endnote_ref); // endnote_ref cannot occur in a code block or else fail
+              buffer.write(content ~ "\n\n");
+            }
+            if (buffer) {
+              try {
+                string dir_out = "converted_output_";
+                string path_and_file_out = dir_out ~ "/" ~ filename;
+                dir_out.mkdirRecurse;
+                auto f = File(path_and_file_out, "w");
+                f.write(buffer);
+                writeln("wrote: ", path_and_file_out);
+              } catch (FileException ex) {
+                writeln("did not write file");
+                // Handle errors
+              }
+            }
+          } else {
+            foreach (content; contents) { /+ loop to inline endnotes +/
+              buffer.write(content ~ "\n\n");
+            }
+          }
+        }
+      } catch (ErrnoException ex) {
+        switch(ex.errno) {
+          case EPERM:
+          case EACCES: // Permission denied
+            break;
+          case ENOENT: // File does not exist
+            break;
+          default:     // Handle other errors
+            break;
+        }
+      }
+    }
+  }
+}
diff --git a/misc/util/d/tools/markup_conversion/markup_changes_header_and_content.d b/misc/util/d/tools/markup_conversion/markup_changes_header_and_content.d
new file mode 100755
index 0000000..86792ff
--- /dev/null
+++ b/misc/util/d/tools/markup_conversion/markup_changes_header_and_content.d
@@ -0,0 +1,244 @@
+#!/usr/bin/env rdmd
+/+
+  - read in file .sst .ssi .ssm
+  - loop twice
+    - first
+      - check for and skip code blocks
+      - use unique code marker for endnote markers in text and give an endnote
+        number ★1, increment
+      - extract all endnotes in array
+    - second
+      - check that the footnote marker number count matches the number of notes
+        in the array
+        - if they match either:
+            - substitute each endnote marker with the array footnote[number-1]
+            - substitute each endnote marker with footnote
+              as inlined footnote markup (footnote number not needed)
+        - if they do not match exit
+  - check whether changes have been made
+    - if so write file with inline footnotes in sub-directory converted_output_/
+      using the same name as the original file
+    - else, exit
++/
+import std.stdio;
+import std.file;
+import std.array : split;
+import std.exception;
+// import std.range;
+import core.stdc.errno;
+import std.regex;
+import std.format;
+import std.conv;
+void main(string[] args) {
+  static heading_a               = ctRegex!(`^:?[A][~] `, "m");
+  static comment                 = ctRegex!(`^%+ `);
+  static block_tic_code_open     = ctRegex!("^`{3} code(?:[.](?P<syntax>[a-z][0-9a-z#+_]+))?(?:[(](?P<attrib>[ a-zA-Z0-9;:,]*)[)])?");
+  static block_tic_close         = ctRegex!("^(`{3})$","m");
+  static block_curly_code_open   = ctRegex!(`^(?:code(?:[.](?P<syntax>[a-z][0-9a-z_]+))?(?:[(](?P<attrib>[ a-zA-Z0-9;:,]*)[)])?[{][ ]*$)`);
+  static block_curly_code_close  = ctRegex!(`^([}]code)`);
+  auto rgx_endnote_ref           = ctRegex!(`([~]\^)(?P<tail>[)\]]? |$)`, "gm");
+  auto rgx_endnote               = ctRegex!(`^\^~\s+(.+|\n)`, "gm");
+  char[][] header0Content1(in string src_text) { // cast(char[])
+    /+ split string on _first_ match of "^:?A~\s" into [header, content] array/tuple +/
+    char[][] header_and_content;
+    auto m = (cast(char[]) src_text).matchFirst(heading_a);
+    header_and_content ~= m.pre;
+    header_and_content ~= m.hit ~ m.post;
+    assert(header_and_content.length == 2,
+      "document markup is broken, header body split == "
+      ~ header_and_content.length.to!string
+      ~ "; (header / body array split should == 2 (split is on level A~))"
+    );
+    return header_and_content;
+  }
+  foreach(arg; args[1..$]) {
+    if (
+      !(arg.match(regex(r"--\w+")))
+      && arg.match(regex(r"\w+?\.ss[itm]"))
+    ) {
+      writeln(arg);
+      string filename                  = arg;
+      try {
+        string[] munged_header, munged_contents, munged_endnotes, endnote_refs;
+        string text                    = filename.readText;
+        char[][] hc                    = header0Content1(text);
+        char[] src_header              = hc[0];
+        string[] headers               = src_header.to!string.split("\n\n");
+        char[] src_txt                 = hc[1];
+        string[] paragraphs            = src_txt.to!string.split("\n\n");
+        int endnote_ref_count          = 0;
+        int[string] type = [
+          "curly_code"                 : 0,
+          "tic_code"                   : 0,
+        ];
+        string _tmp_header;
+        foreach (h_; headers) {                                                                                          /+ loop to inline endnotes +/
+          _tmp_header = "";
+          if (h_.match(regex(r"^[@\[]?title[:\]]?"))) {                                                                  // title
+            if (auto m = h_.match(regex(r"^@title:(?:\s+(?P<c>.+)|$)"))) {                                               // sisu bespoke markup
+              if (m.captures["c"].length == 0) {
+                _tmp_header ~= "title:";
+              } else {
+                _tmp_header ~= "title:\n  main: " ~ "\"" ~ m.captures["c"] ~ "\"";
+              }
+            } else if (auto m = h_.match(regex(r"^title\s*=\s*(?P<c>.+)"))) {                                            // toml?
+              if (m.captures["c"].length == 0) {
+                _tmp_header ~= "title:";
+              } else {
+                _tmp_header ~= "title:\n  main: " ~ "\"" ~ m.captures["c"] ~ "\"";
+              }
+            } else if (auto m = h_.match(regex(r"^\[title\]"))) {                                                        // toml markup
+              _tmp_header ~= "title:";
+            } else if (auto m = h_.match(regex(r"^title(?:\s+(?P<c>.+)|\s+\\$)"))) {                                     // sdlang markup
+              if (m.captures["c"].length == 0) {
+                _tmp_header ~= "title:";
+              } else {
+                _tmp_header ~= "title:\n  main: " ~ "\"" ~ m.captures["c"] ~ "\"";
+              }
+            }
+            if (h_.match(regex(r"^\s*[:]?(?:main)[:= ]?", "m"))) {
+              if (auto m = h_.match(regex(r"^\s+(?P<h>:main):(?:\s+(?P<c>.+)|$)", "m"))) {                                // sisu bespoke markup
+                _tmp_header ~= "  main: " ~ "\"" ~ m.captures["c"] ~ "\"";
+              } else if (auto m = h_.match(regex(r"^\s*(?P<h>main)\s*=\s*(?P<c>.+)", "m"))) {                            // toml?
+                _tmp_header ~= "  main: " ~ m.captures["c"];
+              } else if (auto m = h_.match(regex(r"^\s+(?P<h>main)(?:\s*\s*(?P<c>.+)|$)", "m"))) {                       // toml markup
+                _tmp_header ~= "  main: " ~ "\"" ~ m.captures["c"] ~ "\"";
+              } else if (auto m = h_.match(regex(r"^\s+(?P<h>main)(?:\s+(?P<c>.+)|\s+\\$)", "m"))) {                     // sdlang markup
+                _tmp_header ~= "  main: " ~ "\"" ~ m.captures["c"] ~ "\"";
+              }
+            }
+            if (h_.match(regex(r"^\s*[:]?(?:sub(title)?)[:= ]?", "m"))) {
+              if (auto m = h_.match(regex(r"^\s+:sub(?:title)?:(?:\s+(?P<c>.+)|$)", "m"))) {                             // sisu bespoke markup
+                _tmp_header ~= "  subtitle: " ~ "\"" ~ m.captures["c"] ~ "\"";
+              } else if (auto m = h_.match(regex(r"^\s*sub(?:title)?\s*=\s*(?P<c>.+)$", "m"))) {                         // toml?
+                _tmp_header ~= "  subtitle: " ~ m.captures["c"];
+              } else if (auto m = h_.match(regex(r"^\s+(?:title)?(?:\s*\s*(?P<c>.+)|$)", "m"))) {                        // toml markup
+                _tmp_header ~= "  subtitle: " ~ "\"" ~ m.captures["c"] ~ "\"";
+              } else if (auto m = h_.match(regex(r"^\s+(?:title)?(?:\s+(?P<c>.+)|\s+\\$)", "m"))) {                      // sdlang markup
+                _tmp_header ~= "  subtitle: " ~ "\"" ~ m.captures["c"] ~ "\"";
+              }
+            }
+          }
+          if (h_.match(regex(r"^[@\[]?rights[:\]]?"))) {                                                                 // rights
+            if (auto m = h_.match(regex(r"^@rights:[ ]+(?P<c>.+)$"))) {                                                  // sisu bespoke markup
+              _tmp_header ~= "rights: \n  copyright: \"" ~ m.captures["c"] ~ "\"";
+            } else if (auto m = h_.match(regex(r"^@rights:"))) {                                                         // sisu bespoke markup
+              _tmp_header ~= "rights:";
+            } else if (auto m = h_.match(regex(r"^\[rights\]", "m"))) {                                                  // toml markup
+              _tmp_header ~= "rights:";
+            } else if (auto m = h_.match(regex(r"^rights:"))) {                                                          // sdlang markup
+              _tmp_header ~= "rights:";
+            }
+            if (h_.match(regex(r"^\s*[:]?copyright[:= ]?", "m"))) {
+              if (auto m = h_.match(regex(r"^\s+:copyright:(?:\s+(?P<c>.+)|$)", "m"))) {                                 // sisu bespoke markup
+                _tmp_header ~= "  copyright: " ~ "\"" ~ m.captures["c"] ~ "\"";
+              } else if (auto m = h_.match(regex(r"^\s*copyright\s*=\s*(?P<c>.+)", "m"))) {                              // toml?
+                _tmp_header ~= "  copyright: " ~ m.captures["c"];
+              } else if (auto m = h_.match(regex(r"^\s+<h>copyright(?:\s*\s*(?P<c>.+)|$)", "m"))) {                      // toml markup
+                _tmp_header ~= "  copyright: " ~ "\"" ~ m.captures["c"] ~ "\"";
+              } else if (auto m = h_.match(regex(r"^\s+copyright(?:\s+(?P<c>.+)|\s+\\$)", "m"))) {                       // sdlang markup
+                _tmp_header ~= "  copyright: " ~ "\"" ~ m.captures["c"] ~ "\"";
+              }
+            }
+            if (h_.match(regex(r"^\s*[:]?licen[cs]e[:= ]?", "m"))) {
+              if (auto m = h_.match(regex(r"^\s+:licen[cs]e:(?:\s+(?P<c>.+)|$)", "m"))) {                                // sisu bespoke markup
+                _tmp_header ~= "  license: " ~ "\"" ~ m.captures["c"] ~ "\"";
+              } else if (auto m = h_.match(regex(r"^\s*licen[cs]e\s*=\s*(?P<c>.+)$", "m"))) {                            // toml?
+                _tmp_header ~= "  license: " ~ m.captures["c"];
+              } else if (auto m = h_.match(regex(r"^\s+licen[cs]e(?:\s*\s*(?P<c>.+)|$)", "m"))) {                        // toml markup
+                _tmp_header ~= "  license: " ~ "\"" ~ m.captures["c"] ~ "\"";
+              } else if (auto m = h_.match(regex(r"^\s+licen[cs]e(?:\s+(?P<c>.+)|\s+\\$)", "m"))) {                      // sdlang markup
+                _tmp_header ~= "  license: " ~ "\"" ~ m.captures["c"] ~ "\"";
+              }
+            }
+          }
+          if (_tmp_header.length > 0) {
+            munged_header ~= _tmp_header;
+          } else {
+            munged_header ~= h_;
+          }
+        }
+        writeln(munged_header);
+        foreach (paragraph; paragraphs) {                                                                                  /+ loop to gather binary endnotes +/
+          if ( !( type["curly_code"] == 1 || type["tic_code"] == 1)
+            && paragraph.match(rgx_endnote)
+          ) {
+            munged_endnotes ~= replaceAll!(m => m[1])
+              (paragraph, rgx_endnote);
+          } else {
+            if ( type["curly_code"] == 1 || type["tic_code"] == 1
+              || paragraph.matchFirst(block_curly_code_open)
+              || paragraph.matchFirst(block_tic_code_open)
+            ) { /+ code blocks identified, no munging +/
+              if ( type["curly_code"] == 1
+                && paragraph.matchFirst(block_curly_code_close)
+              ) {
+                type["curly_code"] = 0;
+              } else if (type["tic_code"] == 1
+                && paragraph.matchFirst(block_tic_close)
+              ) {
+                type["tic_code"] = 0;
+              } else if (paragraph.matchFirst(block_curly_code_open)) {
+                type["curly_code"] = 1;
+              } else if (paragraph.matchFirst(block_tic_code_open)) {
+                type["tic_code"] = 1;
+              }
+              munged_contents ~= paragraph;
+            } else { /+ regular content, not a code block +/
+              if (auto m = paragraph.matchAll(rgx_endnote_ref)) {
+                foreach (n; m) {
+                  endnote_ref_count++; // endnote_refs ~= (n.captures[1]);
+                }
+              }
+              paragraph = replaceAll!(m => " \\\\ " )
+                (paragraph, regex(r"\s*<(?:/\s*|:)?br>\s*")); // (paragraph, regex(r"(<br>)"));
+              munged_contents ~= paragraph;
+            }
+          }
+        }
+        {
+          import std.outbuffer;
+          auto buffer = new OutBuffer();
+          foreach (header; munged_header) { /+ loop to inline endnotes +/
+            buffer.write(header ~ "\n\n");
+          }
+          if (munged_endnotes.length == endnote_ref_count) {
+            int endnote_count = -1;
+            foreach (content; munged_contents) { /+ loop to inline endnotes +/
+              content = replaceAll!(m => "~{ " ~ munged_endnotes[++endnote_count] ~ " }~" ~ m["tail"] )
+                (content, rgx_endnote_ref); // endnote_ref cannot occur in a code block or else fail
+              buffer.write(content ~ "\n\n");
+            }
+            if (buffer) {
+              try {
+                string dir_out = "converted_output_";
+                string path_and_file_out = dir_out ~ "/" ~ filename;
+                dir_out.mkdirRecurse;
+                auto f = File(path_and_file_out, "w");
+                f.write(buffer);
+                // writeln("wrote: ", path_and_file_out);
+              } catch (FileException ex) {
+                writeln("did not write file");
+                // Handle errors
+              }
+            }
+          } else {
+            foreach (content; munged_contents) { /+ loop to inline endnotes +/
+              buffer.write(content ~ "\n\n");
+            }
+          }
+        }
+      } catch (ErrnoException ex) {
+        switch(ex.errno) {
+          case EPERM:
+          case EACCES: // Permission denied
+            break;
+          case ENOENT: // File does not exist
+            break;
+          default:     // Handle other errors
+            break;
+        }
+      }
+    }
+  }
+}
diff --git a/misc/util/d/tools/markup_conversion/markup_conversion_from_sisu_ruby_to_sisu_spine.d b/misc/util/d/tools/markup_conversion/markup_conversion_from_sisu_ruby_to_sisu_spine.d
new file mode 100755
index 0000000..94e8718
--- /dev/null
+++ b/misc/util/d/tools/markup_conversion/markup_conversion_from_sisu_ruby_to_sisu_spine.d
@@ -0,0 +1,354 @@
+#!/usr/bin/env rdmd
+/+
+  - read in file .sst .ssi .ssm
+  - loop twice
+    - first
+      - check for and skip code blocks
+      - use unique code marker for endnote markers in text and give an endnote
+        number ★1, increment
+      - extract all endnotes in array
+    - second
+      - check that the footnote marker number count matches the number of notes
+        in the array
+        - if they match either:
+            - substitute each endnote marker with the array footnote[number-1]
+            - substitute each endnote marker with footnote
+              as inlined footnote markup (footnote number not needed)
+        - if they do not match exit
+  - check whether changes have been made
+    - if so write file with inline footnotes in sub-directory converted_output_/
+      using the same name as the original file
+    - else, exit
++/
+import std.stdio;
+import std.file;
+import std.array : split, join;
+import std.exception;
+// import std.range;
+import core.stdc.errno;
+import std.regex;
+import std.format;
+import std.conv;
+void main(string[] args) {
+  static heading_a               = ctRegex!(`^:?[A][~] `, "m");
+  static comment                 = ctRegex!(`^%+ `);
+  static block_tic_code_open     = ctRegex!("^`{3} code(?:[.](?P<syntax>[a-z][0-9a-z#+_]+))?(?:[(](?P<attrib>[ a-zA-Z0-9;:,]*)[)])?");
+  static block_tic_close         = ctRegex!("^(`{3})$","m");
+  static block_curly_code_open   = ctRegex!(`^(?:code(?:[.](?P<syntax>[a-z][0-9a-z_]+))?(?:[(](?P<attrib>[ a-zA-Z0-9;:,]*)[)])?[{][ ]*$)`);
+  static block_curly_code_close  = ctRegex!(`^([}]code)`);
+  auto rgx_endnote_ref           = ctRegex!(`([~]\^)(?P<tail>[)\]]? |$)`, "gm");
+  auto rgx_endnote               = ctRegex!(`^\^~\s+(.+|\n)`, "gm");
+  char[][] header0Content1(in string src_text) { // cast(char[])
+    /+ split string on _first_ match of "^:?A~\s" into [header, content] array/tuple +/
+    char[][] header_and_content;
+    auto m = (cast(char[]) src_text).matchFirst(heading_a);
+    header_and_content ~= m.pre;
+    header_and_content ~= m.hit ~ m.post;
+    assert(header_and_content.length == 2,
+      "document markup is broken, header body split == "
+      ~ header_and_content.length.to!string
+      ~ "; (header / body array split should == 2 (split is on level A~))"
+    );
+    return header_and_content;
+  }
+  string format_body_string(string s) {
+    string o;
+    o = s
+     .replaceAll(regex("^<(?:/[ ]*)?br>[ ]*"), " \\\\ ")
+     .replaceAll(regex("[ ]*<(?:/[ ]*)?br>$"), " \\\\")
+     .replaceAll(regex("[ ]*<(?:/[ ]*)?br>[ ]*"), " \\\\ ");
+    return o;
+  }
+  string format_header_string(string s) {
+    string o;
+    o = s
+     .replaceAll(regex("\""), "\\\"")
+     .replaceAll(regex("[ ]*<(?:/[ ]*)?br>$"), " \\\\")
+     .replaceAll(regex("[ ]*<(?:/[ ]*)?br>[ ]*"), " \\\\ ");
+    return o;
+  }
+  string format_main_header(string hm, string hs = "", string c = "") {
+    string o;
+    if (c.length == 0) {
+      o ~= hm ~ ":\n";
+    } else {
+      o ~= hm ~ ":\n"
+        ~ "  " ~ hs ~ ": "
+        ~ "\"" ~ format_header_string(c) ~ "\"\n";
+    }
+    return o;
+  }
+  string format_sub_header(string hs, string c) {
+    string o;
+    o ~= "  " ~ hs ~ ": "
+      ~ "\"" ~ format_header_string(c) ~ "\"\n";
+    return o;
+  }
+  foreach(arg; args[1..$]) {
+    if (
+      !(arg.match(regex(r"--\w+")))
+      && arg.match(regex(r"\w+?\.ss[itm]"))
+    ) {
+      writeln(arg);
+      string filename                  = arg;
+      try {
+        string[] munged_header, munged_contents, munged_endnotes, endnote_refs;
+        string text                    = filename.readText;
+        char[][] hc                    = header0Content1(text);
+        char[] src_header              = hc[0];
+        string[] headers               = src_header.to!string.split("\n\n");
+        char[] src_txt                 = hc[1];
+        string[] paragraphs            = src_txt.to!string.split("\n\n");
+        int endnote_ref_count          = 0;
+        int[string] type = [
+          "curly_code"                 : 0,
+          "tic_code"                   : 0,
+        ];
+        string _tmp_header;
+        headers[0] = headers[0].replaceFirst(regex(r"^%\s+SiSU.+", "i"), "# SiSU 8.0 spine (auto-conversion)");
+        foreach (h_; headers) {
+          _tmp_header = "";
+          if (auto m = h_.match(regex(r"^%\s*", "m"))) {
+            h_ = h_.replaceAll(regex(r"^%\s*", "m"), "# ") ~ "\n";
+          }
+          if (h_.match(regex(r"^@title:|@subtitle"))) {
+            if (auto m = h_.match(regex(r"^@(?P<h>title):(?:[ ]+(?P<c>.+)|\n)"))) {
+              _tmp_header ~= format_main_header(m.captures["h"], "main", m.captures["c"]);
+            }
+            if (auto m = h_.match(regex(r"^@(?P<h>subtitle):(?:[ ]+(?P<c>.+)|$)"))) {
+              if (m.captures["c"].length == 0) {
+              } else {
+                _tmp_header ~= format_sub_header(m.captures["h"], m.captures["c"]);
+              }
+            }
+            if (auto m = h_.match(regex(r"^\s+:(?P<h>main):(?:[ ]+(?P<c>.+)|$)", "m"))) {
+              _tmp_header ~= format_sub_header(m.captures["h"], m.captures["c"]);
+            }
+            if (auto m = h_.match(regex(r"^\s+:sub(?:title)?:(?:[ ]+(?P<c>.+)|$)", "m"))) {
+              _tmp_header ~= format_sub_header("subtitle", m.captures["c"]);
+            }
+          } else if (h_.match(regex(r"^@creator:|@author:"))) {
+            if (auto m = h_.match(regex(r"^(?:@creator:|@author:)(?:[ ]+(?P<c>.+)|\n)"))) {
+              _tmp_header ~= format_main_header("creator", "author", m.captures["c"]);
+            }
+            if (auto m = h_.match(regex(r"^\s+:(?P<h>author):(?:[ ]+(?P<c>.+)|$)", "m"))) {
+              _tmp_header ~= format_sub_header(m.captures["h"], m.captures["c"]);
+            }
+          } else if (h_.match(regex(r"^@rights:"))) {
+            if (auto m = h_.match(regex(r"^@(?P<h>rights):(?:[ ]+(?P<c>.+)|\n)"))) {
+              _tmp_header ~= format_main_header(m.captures["h"], "copyright", m.captures["c"]);
+            }
+            if (auto m = h_.match(regex(r"^\s+:(?P<h>copyright):(?:[ ]+(?P<c>.+)|$)", "m"))) {
+              _tmp_header ~= format_sub_header(m.captures["h"], m.captures["c"]);
+            }
+            if (auto m = h_.match(regex(r"^\s+:licen[cs]e:(?:[ ]+(?P<c>.+)|$)", "m"))) {
+              _tmp_header ~= format_sub_header("license", m.captures["c"]);
+            }
+          } else if (h_.match(regex(r"^@date:|@date\."))) {
+            if (auto m = h_.match(regex(r"^@(?P<h>date):(?:[ ]+(?P<c>.+)|\n)"))) {
+              _tmp_header ~= format_main_header(m.captures["h"], "published", m.captures["c"]);
+            }
+            if (auto m = h_.match(regex(r"^\s+:(?P<h>published):(?:[ ]+(?P<c>.+)|$)", "m"))) {
+              _tmp_header ~= format_sub_header(m.captures["h"], m.captures["c"]);
+            }
+            if (auto m = h_.match(regex(r"^\s+:(?P<h>available):(?:[ ]+(?P<c>.+)|$)", "m"))) {
+              _tmp_header ~= format_sub_header(m.captures["h"], m.captures["c"]);
+            }
+            if (auto m = h_.match(regex(r"^\s+:(?P<h>modified):(?:[ ]+(?P<c>.+)|$)", "m"))) {
+              _tmp_header ~= format_sub_header(m.captures["h"], m.captures["c"]);
+            }
+            if (auto m = h_.match(regex(r"^\s+:(?P<h>created):(?:[ ]+(?P<c>.+)|$)", "m"))) {
+              _tmp_header ~= format_sub_header(m.captures["h"], m.captures["c"]);
+            }
+            if (auto m = h_.match(regex(r"^\s+:(?P<h>issued):(?:[ ]+(?P<c>.+)|$)", "m"))) {
+              _tmp_header ~= format_sub_header(m.captures["h"], m.captures["c"]);
+            }
+            if (auto m = h_.match(regex(r"^\s+:(?P<h>valid):(?:[ ]+(?P<c>.+)|$)", "m"))) {
+              _tmp_header ~= format_sub_header(m.captures["h"], m.captures["c"]);
+            }
+            if (auto m = h_.match(regex(r"^@date\.(?P<h>available):[ ]+(?P<c>.+)$"))) {
+              _tmp_header ~= format_sub_header(m.captures["h"], m.captures["c"]);
+            }
+            if (auto m = h_.match(regex(r"^@date\.(?P<h>modified):[ ]+(?P<c>.+)$"))) {
+              _tmp_header ~= format_sub_header(m.captures["h"], m.captures["c"]);
+            }
+            if (auto m = h_.match(regex(r"^@date\.(?P<h>created):[ ]+(?P<c>.+)$"))) {
+              _tmp_header ~= format_sub_header(m.captures["h"], m.captures["c"]);
+            }
+            if (auto m = h_.match(regex(r"^@date\.(?P<h>issued):[ ]+(?P<c>.+)$"))) {
+              _tmp_header ~= format_sub_header(m.captures["h"], m.captures["c"]);
+            }
+            if (auto m = h_.match(regex(r"^@date\.(?P<h>valid):[ ]+(?P<c>.+)$"))) {
+              _tmp_header ~= format_sub_header(m.captures["h"], m.captures["c"]);
+            }
+          } else if (h_.match(regex(r"^@classify:"))) {
+            if (auto m = h_.match(regex(r"^@classify:"))) {
+              _tmp_header ~= "classify:\n";
+            }
+            if (auto m = h_.match(regex(r"^\s+:(?P<h>topic_register):(?:[ ]+(?P<c>.+)|$)", "m"))) {
+              _tmp_header ~= format_sub_header(m.captures["h"], m.captures["c"]);
+            }
+            if (auto m = h_.match(regex(r"^\s+:type:(?:[ ]+(?P<c>.+)|$)", "m"))) {
+              _tmp_header ~= "#  type: " ~ "\"" ~ m.captures["c"] ~ "\"\n";
+            }
+          } else if (h_.match(regex(r"^(?:@identifier:|@identify:)"))) {
+            if (auto m = h_.match(regex(r"^(?:@identifier:|@idenfify)"))) {
+              _tmp_header ~= "identify:\n";
+            }
+            if (auto m = h_.match(regex(r"^\s+:(?P<h>oclc):(?:[ ]+(?P<c>.+)|$)", "m"))) {
+              _tmp_header ~= format_sub_header(m.captures["h"], m.captures["c"]);
+            }
+            if (auto m = h_.match(regex(r"^\s+:(?P<h>isbn):(?:[ ]+(?P<c>.+)|$)", "m"))) {
+              _tmp_header ~= format_sub_header(m.captures["h"], m.captures["c"]);
+            }
+            if (auto m = h_.match(regex(r"^\s+:(?P<h>dewey):(?:[ ]+(?P<c>.+)|$)", "m"))) {
+              _tmp_header ~= format_sub_header(m.captures["h"], m.captures["c"]);
+            }
+          } else if (h_.match(regex(r"^@publisher:"))) {
+            if (auto m = h_.match(regex(r"^@publisher:[ ]+(?P<c>.+)$"))) {
+              _tmp_header ~= "publisher: " ~  "\"" ~ m.captures["c"] ~ "\"\n";
+            }
+          } else if (h_.match(regex(r"^@make:"))) {
+            // writeln(h_);
+            if (auto m = h_.match(regex(r"^@make:"))) {
+              _tmp_header ~= "make:\n";
+            }
+            if (auto m = h_.match(regex(r"^\s+:(?P<h>breaks):(?:[ ]+(?P<c>.+)|$)", "m"))) {
+              _tmp_header ~= format_sub_header(m.captures["h"], m.captures["c"]);
+            }
+            if (auto m = h_.match(regex(r"^\s+:(?P<h>num_top):(?:[ ]+(?P<c>.+)|$)", "m"))) {
+              _tmp_header ~= format_sub_header(m.captures["h"], m.captures["c"]);
+            }
+            if (auto m = h_.match(regex(r"^\s+:(?P<h>headings):(?:[ ]+(?P<c>.+)|$)", "m"))) {
+              _tmp_header ~= format_sub_header(m.captures["h"], m.captures["c"]);
+            }
+            if (auto m = h_.match(regex(r"^\s+:(?P<h>italics):(?:[ ]+(?P<c>.+)|$)", "m"))) {
+              _tmp_header ~= format_sub_header(m.captures["h"], m.captures["c"]);
+            }
+            if (auto m = h_.match(regex(r"^\s+:(?P<h>bold):(?:[ ]+(?P<c>.+)|$)", "m"))) {
+              _tmp_header ~= format_sub_header(m.captures["h"], m.captures["c"]);
+            }
+            if (auto m = h_.match(regex(r"^\s+:(?P<h>emphasis):(?:[ ]+(?P<c>.+)|$)", "m"))) {
+              _tmp_header ~= format_sub_header(m.captures["h"], m.captures["c"]);
+            }
+            if (auto m = h_.match(regex(r"^\s+:(?P<h>texpdf_font):(?:[ ]+(?P<c>.+)|$)", "m"))) {
+              _tmp_header ~= format_sub_header(m.captures["h"], m.captures["c"]);
+            }
+            if (auto m = h_.match(regex(r"^\s+:(?P<h>home_button_text):(?:[ ]+(?P<c>.+)|$)", "m"))) {
+              _tmp_header ~= format_sub_header(m.captures["h"], m.captures["c"]);
+            }
+            if (auto m = h_.match(regex(r"^\s+:(?P<h>home_button_image):(?:[ ]+(?P<c>.+)|$)", "m"))) {
+              _tmp_header ~= format_sub_header(m.captures["h"], m.captures["c"]);
+            }
+            if (auto m = h_.match(regex(r"^\s+:(?P<h>cover_image):(?:[ ]+(?P<c>.+)|$)", "m"))) {
+              _tmp_header ~= format_sub_header(m.captures["h"], m.captures["c"]);
+            }
+            if (auto m = h_.match(regex(r"^\s+:(?P<h>footer):(?:[ ]+(?P<c>.+)|$)", "m"))) {
+              _tmp_header ~= format_sub_header(m.captures["h"], m.captures["c"]);
+            }
+            // writeln(_tmp_header);
+          } else if (h_.match(regex(r"^@\w+:"))) {
+            _tmp_header ~= "# " ~ h_.split("\n").join("\n# ") ~ "\n";
+          } else if (h_.match(regex(r"^\s+:\w+:", "m"))) {
+            if (auto m = h_.match(regex(r"^(?P<g>\s+:\w+:.*)"))) {
+              _tmp_header ~= "# " ~ m.captures["g"] ~ "\n";
+            }
+          }
+          if (h_.match(regex(r"^#", "m"))) {
+            if (auto m = h_.match(regex(r"^(?P<g>#.*)", "m"))) {
+              _tmp_header ~= m.captures["g"] ~ "\n";
+            }
+           }
+          if (_tmp_header.length > 0) {
+            munged_header ~= _tmp_header.split("\n\n");
+          } else if (h_.length > 0) {
+            writeln("munging required: ", h_);
+            h_ = h_.replaceAll((regex(r"\n\n\n+", "m")), "\n\n");
+            munged_header ~= h_;
+          }
+        }
+        // writeln(munged_header.join("\n"));
+        foreach (paragraph; paragraphs) {                                                                                  /+ loop to gather binary endnotes +/
+          if ( !( type["curly_code"] == 1 || type["tic_code"] == 1)
+            && paragraph.match(rgx_endnote)
+          ) {
+            munged_endnotes ~= replaceAll!(m => m[1])
+              (paragraph, rgx_endnote);
+          } else {
+            if ( type["curly_code"] == 1 || type["tic_code"] == 1
+              || paragraph.matchFirst(block_curly_code_open)
+              || paragraph.matchFirst(block_tic_code_open)
+            ) { /+ code blocks identified, no munging +/
+              if ( type["curly_code"] == 1
+                && paragraph.matchFirst(block_curly_code_close)
+              ) {
+                type["curly_code"] = 0;
+              } else if (type["tic_code"] == 1
+                && paragraph.matchFirst(block_tic_close)
+              ) {
+                type["tic_code"] = 0;
+              } else if (paragraph.matchFirst(block_curly_code_open)) {
+                type["curly_code"] = 1;
+              } else if (paragraph.matchFirst(block_tic_code_open)) {
+                type["tic_code"] = 1;
+              }
+              munged_contents ~= paragraph;
+            } else { /+ regular content, not a code block +/
+              if (auto m = paragraph.matchAll(rgx_endnote_ref)) {
+                foreach (n; m) {
+                  endnote_ref_count++; // endnote_refs ~= (n.captures[1]);
+                }
+              }
+              paragraph = format_body_string(paragraph);
+              // paragraph = replaceAll!(m => " \\\\ " )
+              //   (paragraph, regex(r"\s*<(?:/\s*|:)?br>\s*")); // (paragraph, regex(r"(<br>)"));
+              munged_contents ~= paragraph;
+            }
+          }
+        }
+        {
+          import std.outbuffer;
+          auto buffer = new OutBuffer();
+          foreach (header; munged_header) { /+ loop to inline endnotes +/
+            buffer.write(header ~ "\n");
+          }
+          if (munged_endnotes.length == endnote_ref_count) {
+            int endnote_count = -1;
+            foreach (content; munged_contents) { /+ loop to inline endnotes +/
+              content = replaceAll!(m => "~{ " ~ munged_endnotes[++endnote_count] ~ " }~" ~ m["tail"] )
+                (content, rgx_endnote_ref); // endnote_ref cannot occur in a code block or else fail
+              buffer.write(content ~ "\n\n");
+            }
+            if (buffer) {
+              try {
+                string dir_out = "converted_output_";
+                string path_and_file_out = dir_out ~ "/" ~ filename;
+                dir_out.mkdirRecurse;
+                auto f = File(path_and_file_out, "w");
+                f.write(buffer);
+                // writeln("wrote: ", path_and_file_out);
+              } catch (FileException ex) {
+                writeln("did not write file");
+                // Handle errors
+              }
+            }
+          } else {
+            foreach (content; munged_contents) { /+ loop to inline endnotes +/
+              buffer.write(content ~ "\n\n");
+            }
+          }
+        }
+      } catch (ErrnoException ex) {
+        switch(ex.errno) {
+          case EPERM:
+          case EACCES: // Permission denied
+            break;
+          case ENOENT: // File does not exist
+            break;
+          default:     // Handle other errors
+            break;
+        }
+      }
+    }
+  }
+}