document digests and reduction in use of tuples

14 files changed, 177 insertions, 94 deletions

diff --git a/org/in_source_files.org b/org/in_source_files.org
index 90143f4..6275ed4 100644
--- a/org/in_source_files.org
+++ b/org/in_source_files.org
@@ -298,6 +298,7 @@ module sisudoc.io_in.read_source_files;
 @safe:
 template spineRawMarkupContent() {
   import
+    std.digest.sha,
     std.file,
     std.path;
   import
@@ -309,6 +310,14 @@ template spineRawMarkupContent() {
   static auto rgx = RgxI();
   mixin spineRgxFiles;
   static auto rgx_files = RgxFiles();
+  struct ST_doc_parts {
+    char[]     header_raw;
+    char[][]   sourcefile_body_content;
+    string[]   insert_file_list;
+    string[]   images_list;
+    ubyte[32]  header_raw_digest;
+    ubyte[32]  src_txt_digest;
+  }
   string[] _images=[];
   string[] _extract_images(S)(S content_block) {
     string[] images_;
@@ -328,7 +337,9 @@ template spineRawMarkupContent() {
     char[],   "header",
     char[][], "src_txt",
     string[], "insert_files",
-    string[], "images"
+    string[], "images",
+    ubyte[32], "header_digest",
+    ubyte[32], "src_txt_digest"
   );
   auto spineRawMarkupContent(O,Fn)(O _opt_action, Fn fn_src) {
     auto _0_header_1_body_content_2_insert_filelist_tuple
@@ -342,43 +353,50 @@ template spineRawMarkupContent() {
         = raw.markupSourceReadIn(fn_src);
       return source_txt_str;
     }
-    final auto sourceContentSplitIntoHeaderAndBody(O)(
+    final ST_doc_parts sourceContentSplitIntoHeaderAndBody(O)(
       O         _opt_action,
       in string source_txt_str,
       in string fn_src=""
     ) {
       auto raw = MarkupRawUnit();
-      string[] insert_file_list;
-      string[] images_list;
+      string[] insert_file_list_get;
+      string[] images_list_get;
       HeaderContentInsertsImages t
         = raw.markupSourceHeaderContentRawLineTupleArray(source_txt_str);
       char[] header_raw = t.header;
+      ubyte[32] header_raw_digest = t.header.sha256Of;
       char[][] sourcefile_body_content = t.src_txt;
       if (fn_src.match(rgx_files.src_fn_master)) { // filename with path needed if master file (.ssm) not otherwise
         auto ins = Inserts();
         ContentsInsertsImages tu
           = ins.scan_master_src_for_insert_files_and_import_content(_opt_action, sourcefile_body_content, fn_src);
         sourcefile_body_content = tu.contents;
-        insert_file_list = tu.insert_files.dup;
-        images_list = tu.images.dup;
+        insert_file_list_get = tu.insert_files.dup;
+        images_list_get = tu.images.dup;
       } else if (_opt_action.source || _opt_action.pod) {
         auto ins = Inserts();
         ContentsInsertsImages tu
           = ins.scan_master_src_for_insert_files_and_import_content(_opt_action, sourcefile_body_content, fn_src);
-        images_list = tu.images.dup;
-      }
+        images_list_get = tu.images.dup;
+      } // image_list, if path could take sha256 digests already here?
+      ubyte[32] src_txt_digest = sourcefile_body_content.sha256Of;
       string header_type = "";
-      t = tuple(
-        header_raw,
-        sourcefile_body_content,
-        insert_file_list,
-        images_list
-      );
-      return t;
+      ST_doc_parts ret;
+      {
+        ret.header_raw = t.header;
+        ret.sourcefile_body_content =  sourcefile_body_content;
+        ret.insert_file_list = insert_file_list_get;
+        ret.images_list = images_list_get;
+        ret.header_raw_digest = t.header.sha256Of;
+        ret.src_txt_digest = sourcefile_body_content.sha256Of;
+      }
+      return ret;
     }
   }
   struct MarkupRawUnit {
-    import std.file;
+    import
+      std.digest.sha,
+      std.file;
     <<meta_markup_source_raw_read_file_source_string>>
     <<meta_markup_source_raw_doc_header_and_content_split>>
     <<meta_markup_source_raw_source_line_array>>
@@ -517,11 +535,15 @@ HeaderContentInsertsImages markupSourceHeaderContentRawLineTupleArray(in string
   char[] header = hc[0];
   char[] source_txt = hc[1];
   char[][] source_line_arr = markupSourceLineArray(source_txt);
+  ubyte[32] header_digest;
+  ubyte[32] src_txt_digest;
   HeaderContentInsertsImages t = tuple(
     header,
     source_line_arr,
     file_insert_list,
-    images_list
+    images_list,
+    header_digest,
+    src_txt_digest
   );
   return t;
 }
diff --git a/org/ocda.org b/org/ocda.org
index 696c4c9..9811545 100644
--- a/org/ocda.org
+++ b/org/ocda.org
@@ -54,6 +54,7 @@ template docAbstraction() {
 import
   std.algorithm,
   std.container,
+  std.digest.sha,
   std.file,
   std.json,
   std.path;
@@ -1001,8 +1002,7 @@ foreach (ref obj; the_document_head_section) {
   }
   obj = _links(obj);
 }
-if (the_document_toc_section.length > 1) {
-  // scroll
+if (the_document_toc_section.length > 1) {  // writeln("toc"); // scroll
   dom_structure_markedup_tags_status_buffer = dom_structure_markedup_tags_status.dup;
   dom_structure_collapsed_tags_status_buffer = dom_structure_collapsed_tags_status.dup;
   foreach (ref obj; the_document_toc_section) {
@@ -1028,7 +1028,7 @@ if (the_document_toc_section.length > 1) {
 // images
 string[] _images;
 // multiple 1~ levels, loop through document body
-if (the_document_body_section.length > 1) {
+if (the_document_body_section.length > 1) { // writeln("body");
   foreach (ref obj; the_document_body_section) {
     if (!(obj.metainfo.identifier.empty)) {
       if (!(((obj.metainfo.identifier) in tag_assoc)
@@ -1064,12 +1064,26 @@ if (the_document_body_section.length > 1) {
        _images ~= extract_images(obj.text);
        obj = _image_dimensions(obj, manifested);
     }
+    obj.metainfo.sha256 = obj.obj_digest;
     obj = _links(obj);
   }
 }
-auto image_list = (_images.sort()).uniq;
+auto image_list = (_images.sort()).uniq; // also get digest on each image here? // workon
+if (_images.length > 0) {
+  foreach (img; image_list) {
+    try { // also get sha digest on image file
+      // read_image
+      auto data = (cast(byte[]) (manifested.src.image_dir_path ~ "/" ~ img).read);
+      // calculate, digest, hash
+      writefln("%s\n%-(%02x%)::%s ⋅ %s", img, data.sha256Of, data.length, img);
+      writefln("%-(%02x%) ⋅ %s ⋅ %s", data.sha256Of, img, data.length);
+    } catch (Exception ex) {
+      writeln("WARNING, image not found: ", img, "\n  ", manifested.src.image_dir_path ~ "/" ~ img);
+    }
+  }
+}
 // endnotes optional only one 1~ level
-if (the_document_endnotes_section.length > 1) {
+if (the_document_endnotes_section.length > 1) { // writeln("endnotes");
   dom_structure_markedup_tags_status_buffer           = dom_structure_markedup_tags_status.dup;
   dom_structure_collapsed_tags_status_buffer          = dom_structure_collapsed_tags_status.dup;
   dom_structure_markedup_tags_status                  = dom_structure_markedup_tags_status_buffer.dup;
@@ -1104,7 +1118,7 @@ if (the_document_endnotes_section.length > 1) {
   }
 }
 // glossary optional only one 1~ level
-if (the_document_glossary_section.length > 1) {
+if (the_document_glossary_section.length > 1) { // writeln("glossary");
   foreach (ref obj; the_document_glossary_section) {
     if (obj.metainfo.is_a == "heading") {
       debug(dom) { writeln(obj.text); }
@@ -1135,11 +1149,12 @@ if (the_document_glossary_section.length > 1) {
       obj.metainfo.ocn        = obj_cite_digits.object_number;
       obj.metainfo.identifier = obj_cite_digits.identifier;
     }
+    obj.metainfo.sha256 = obj.obj_digest;
     obj = _links(obj);
   }
 }
 // bibliography optional only one 1~ level
-if (the_document_bibliography_section.length > 1) {
+if (the_document_bibliography_section.length > 1) { // writeln("bibliography");
   foreach (ref obj; the_document_bibliography_section) {
     if (obj.metainfo.is_a == "heading") {
       debug(dom) { writeln(obj.text); }
@@ -1170,6 +1185,7 @@ if (the_document_bibliography_section.length > 1) {
       obj.metainfo.ocn                                = obj_cite_digits.object_number;
       obj.metainfo.identifier                         = obj_cite_digits.identifier;
     }
+    obj.metainfo.sha256 = obj.obj_digest;
     obj = _links(obj);
   }
 }
@@ -1177,7 +1193,7 @@ if (the_document_bibliography_section.length > 1) {
 int ocn_       = obj_cite_digits.object_number;
 int ocn_bkidx_ = 0;
 int ocn_bidx_;
-if (the_document_bookindex_section.length > 1) {                                        // scroll
+if (the_document_bookindex_section.length > 1) { // writeln("book index");                                        // scroll
   dom_structure_markedup_tags_status_buffer = dom_structure_markedup_tags_status.dup;
   dom_structure_collapsed_tags_status_buffer = dom_structure_collapsed_tags_status.dup;
   foreach (ref obj; the_document_bookindex_section) {
@@ -1214,13 +1230,14 @@ if (the_document_bookindex_section.length > 1) {
       obj.metainfo.o_n_book_index                     = obj_cite_digits.bkidx;
       obj.metainfo.object_number_type                 = OCNtype.bkidx;
     }
+    obj.metainfo.sha256 = obj.obj_digest;
     obj = _links(obj);
   }
   // TODO assert failure, reinstate
   // assert(obj_cite_digit_bkidx == ocn_bidx_ obj_cite_digit_bkidx ~ " == ocn_" ~ ocn_ ~ "?");
 }
 // blurb optional only one 1~ level
-if (the_document_blurb_section.length > 1) {
+if (the_document_blurb_section.length > 1) { // writeln("blurb");
   foreach (ref obj; the_document_blurb_section) {
     if (obj.metainfo.is_a == "heading") {
       debug(dom) { writeln(obj.text); }
@@ -1251,6 +1268,7 @@ if (the_document_blurb_section.length > 1) {
       obj.metainfo.object_number_off                  = obj_cite_digits.off;
       obj.metainfo.object_number_type                 = OCNtype.non;
     }
+    obj.metainfo.sha256 = obj.obj_digest;
     obj = _links(obj);
   }
 }
diff --git a/org/ocda_functions.org b/org/ocda_functions.org
index 6c300f1..ecc8b2f 100644
--- a/org/ocda_functions.org
+++ b/org/ocda_functions.org
@@ -47,18 +47,6 @@ template docSectKeysSeq() {
 #+HEADER: :noweb yes
 #+BEGIN_SRC d
 // ↓ abstraction imports
-import
-  std.algorithm,
-  std.container,
-  std.file,
-  std.json,
-  std.path;
-import
-  sisudoc.meta,
-  sisudoc.meta.defaults,
-  sisudoc.meta.rgx,
-  sisudoc.meta.metadoc_object_setter,
-  sisudoc.meta.rgx;
 // ↓ abstraction mixins
 mixin ObjectSetter;
 mixin InternalMarkup;
@@ -126,6 +114,7 @@ auto node_construct = NodeStructureMetadata();
 <<ocdaFunc_obj_inline_markup>>
 <<ocdaFunc_obj_attributes>>
 <<ocdaFunc_obj_set_markup_level_tags>>
+<<ocdaFunc_obj_digest>>
 <<ocdaFunc_section_toc>>
 <<ocdaFunc_section_endnotes>>
 <<ocdaFunc_section_book_index>>
@@ -3203,6 +3192,26 @@ pure ObjGenericComposite obj_dom_set_collapsed_tags()(
 // ↑ - object tags
 #+END_SRC
 
+***** ϝ object digest
+
+#+NAME: ocdaFunc_obj_digest
+#+HEADER: :noweb yes
+#+BEGIN_SRC d
+// ↓ - object digest
+pure ubyte[32] obj_digest()(
+  ObjGenericComposite  obj,
+) {
+  obj.metainfo.sha256 = obj.text.sha256Of;
+  // if (obj.metainfo.is_a == "heading") {
+  //   writeln(obj.metainfo.sha256.toHexString, " ", obj.metainfo.ocn, " ", obj.metainfo.is_a, " ", obj.metainfo.heading_lev_markup);
+  // } else {
+  //   writeln(obj.metainfo.sha256.toHexString, " ", obj.metainfo.ocn, " ", obj.metainfo.is_a);
+  // }
+  return obj.metainfo.sha256;
+}
+// ↑ - object digest
+#+END_SRC
+
 **** ϝ section
 ***** ϝ section toc - table of contents
 
diff --git a/org/ocda_obj_setter.org b/org/ocda_obj_setter.org
index 5002ee2..576c693 100644
--- a/org/ocda_obj_setter.org
+++ b/org/ocda_obj_setter.org
@@ -121,6 +121,7 @@ struct DocObj_MetaInfo_ {
   int                    parent_lev_markup                    = 0;
   int                    parent_ocn                           = 0;
   int                    last_descendant_ocn                  = 0;
+  ubyte[32]              sha256;
 }
 #+END_SRC
 
diff --git a/org/out_latex.org b/org/out_latex.org
index bb9d6cb..9685554 100644
--- a/org/out_latex.org
+++ b/org/out_latex.org
@@ -664,7 +664,6 @@ fonts to try:
 #+NAME: ImportsAndMixins_imports
 #+BEGIN_SRC d
 import
-  std.digest.sha,
   std.file,
   std.outbuffer,
   std.uri,
diff --git a/org/out_odt.org b/org/out_odt.org
index 048fd11..4344473 100644
--- a/org/out_odt.org
+++ b/org/out_odt.org
@@ -1046,7 +1046,6 @@ import
   sisudoc.io_out.rgx,
   sisudoc.io_out.rgx_xhtml;
 import
-  std.digest.sha,
   std.file,
   std.outbuffer,
   std.uri,
diff --git a/org/spine.org b/org/spine.org
index ac9f552..56cb3f7 100644
--- a/org/spine.org
+++ b/org/spine.org
@@ -1463,7 +1463,6 @@ module sisudoc.meta.metadoc;
 template spineAbstraction() {
   <<imports_spine_metadoc>>
   <<spine_metadoc_mixin>>
-  enum headBody { header, body_content, insert_file_list, image_list }
   enum makeMeta { make, meta }
   enum docAbst  { doc_abstract_obj, doc_has }
   @system auto spineAbstraction(E,P,O,Cfg,M,S)(
@@ -1517,8 +1516,8 @@ template spineAbstraction() {
 
 if build source pod requested all information needed to build it available at this point
   - manifest related information  _manifest
-  - insert file list              _header_body_insertfilelist_imagelist[headBody.insert_file_list]
-  - image list                    _header_body_insertfilelist_imagelist[headBody.image_list]
+  - insert file list              _header_body_insertfilelist_imagelist.insert_file_list]
+  - image list                    _header_body_insertfilelist_imagelist.image_list]
 
 #+NAME: spine_each_file_do_read_and_split_dr_markup_file_content_into_header_and_body
 #+BEGIN_SRC d
@@ -1531,7 +1530,6 @@ if ((_opt_action.debug_do)
 }
 auto _header_body_insertfilelist_imagelist
   = spineRawMarkupContent!()(_opt_action, _manifest.src.path_and_fn);
-static assert(_header_body_insertfilelist_imagelist.length==4);
 if ((_opt_action.debug_do)
   || (_opt_action.debug_do_stages)
 ) {
@@ -1540,7 +1538,7 @@ if ((_opt_action.debug_do)
 debug(header_and_body) {
   writeln(header);
   writeln(_header_body_insertfilelist_imagelist.length);
-  writeln(_header_body_insertfilelist_imagelist.length[headBody.body_content][0]);
+  // writeln(_header_body_insertfilelist_imagelist.length.body_content[0]);
 }
 #+END_SRC
 
@@ -1568,7 +1566,7 @@ if ((_opt_action.debug_do)
 import sisudoc.meta.conf_make_meta_yaml;
 _make_and_meta_struct =
   docHeaderMakeAndMetaTupYamlExtractAndConvertToStruct!()(
-    _header_body_insertfilelist_imagelist[headBody.header],
+    _header_body_insertfilelist_imagelist.header_raw,
     _make_and_meta_struct,
     _manifest,
     _opt_action,
@@ -1603,7 +1601,7 @@ if ((_opt_action.debug_do)
   writeln("step3 commence → (document abstraction (da); da keys; segnames; doc_matters) [", _manifest.src.filename, "]");
 }
 auto da = docAbstraction!()(
-  _header_body_insertfilelist_imagelist[headBody.body_content],
+  _header_body_insertfilelist_imagelist.sourcefile_body_content,
   _make_and_meta_struct,
   _opt_action,
   _manifest,
@@ -1798,7 +1796,7 @@ auto output_path() {
 auto srcs() {
   struct SRC_ {
     auto file_insert_list() {
-      return _header_body_insertfilelist_imagelist[headBody.insert_file_list];
+      return _header_body_insertfilelist_imagelist.insert_file_list;
     }
     auto image_list() {
       return _doc_has_struct.imagelist;
diff --git a/src/sisudoc/io_in/read_source_files.d b/src/sisudoc/io_in/read_source_files.d
index 4ba0b4f..8d814fc 100644
--- a/src/sisudoc/io_in/read_source_files.d
+++ b/src/sisudoc/io_in/read_source_files.d
@@ -56,6 +56,7 @@ module sisudoc.io_in.read_source_files;
 @safe:
 template spineRawMarkupContent() {
   import
+    std.digest.sha,
     std.file,
     std.path;
   import
@@ -67,6 +68,14 @@ template spineRawMarkupContent() {
   static auto rgx = RgxI();
   mixin spineRgxFiles;
   static auto rgx_files = RgxFiles();
+  struct ST_doc_parts {
+    char[]     header_raw;
+    char[][]   sourcefile_body_content;
+    string[]   insert_file_list;
+    string[]   images_list;
+    ubyte[32]  header_raw_digest;
+    ubyte[32]  src_txt_digest;
+  }
   string[] _images=[];
   string[] _extract_images(S)(S content_block) {
     string[] images_;
@@ -86,7 +95,9 @@ template spineRawMarkupContent() {
     char[],   "header",
     char[][], "src_txt",
     string[], "insert_files",
-    string[], "images"
+    string[], "images",
+    ubyte[32], "header_digest",
+    ubyte[32], "src_txt_digest"
   );
   auto spineRawMarkupContent(O,Fn)(O _opt_action, Fn fn_src) {
     auto _0_header_1_body_content_2_insert_filelist_tuple
@@ -100,43 +111,50 @@ template spineRawMarkupContent() {
         = raw.markupSourceReadIn(fn_src);
       return source_txt_str;
     }
-    final auto sourceContentSplitIntoHeaderAndBody(O)(
+    final ST_doc_parts sourceContentSplitIntoHeaderAndBody(O)(
       O         _opt_action,
       in string source_txt_str,
       in string fn_src=""
     ) {
       auto raw = MarkupRawUnit();
-      string[] insert_file_list;
-      string[] images_list;
+      string[] insert_file_list_get;
+      string[] images_list_get;
       HeaderContentInsertsImages t
         = raw.markupSourceHeaderContentRawLineTupleArray(source_txt_str);
       char[] header_raw = t.header;
+      ubyte[32] header_raw_digest = t.header.sha256Of;
       char[][] sourcefile_body_content = t.src_txt;
       if (fn_src.match(rgx_files.src_fn_master)) { // filename with path needed if master file (.ssm) not otherwise
         auto ins = Inserts();
         ContentsInsertsImages tu
           = ins.scan_master_src_for_insert_files_and_import_content(_opt_action, sourcefile_body_content, fn_src);
         sourcefile_body_content = tu.contents;
-        insert_file_list = tu.insert_files.dup;
-        images_list = tu.images.dup;
+        insert_file_list_get = tu.insert_files.dup;
+        images_list_get = tu.images.dup;
       } else if (_opt_action.source || _opt_action.pod) {
         auto ins = Inserts();
         ContentsInsertsImages tu
           = ins.scan_master_src_for_insert_files_and_import_content(_opt_action, sourcefile_body_content, fn_src);
-        images_list = tu.images.dup;
+        images_list_get = tu.images.dup;
       }
+      ubyte[32] src_txt_digest = sourcefile_body_content.sha256Of;
       string header_type = "";
-      t = tuple(
-        header_raw,
-        sourcefile_body_content,
-        insert_file_list,
-        images_list
-      );
-      return t;
+      ST_doc_parts ret;
+      {
+        ret.header_raw = t.header;
+        ret.sourcefile_body_content =  sourcefile_body_content;
+        ret.insert_file_list = insert_file_list_get;
+        ret.images_list = images_list_get;
+        ret.header_raw_digest = t.header.sha256Of;
+        ret.src_txt_digest = sourcefile_body_content.sha256Of;
+      }
+      return ret;
     }
   }
   struct MarkupRawUnit {
-    import std.file;
+    import
+      std.digest.sha,
+      std.file;
     final private string readInMarkupSource(in char[] fn_src) {
       enforce(
         exists(fn_src) != 0,
@@ -195,11 +213,15 @@ template spineRawMarkupContent() {
       char[] header = hc[0];
       char[] source_txt = hc[1];
       char[][] source_line_arr = markupSourceLineArray(source_txt);
+      ubyte[32] header_digest;
+      ubyte[32] src_txt_digest;
       HeaderContentInsertsImages t = tuple(
         header,
         source_line_arr,
         file_insert_list,
-        images_list
+        images_list,
+        header_digest,
+        src_txt_digest
       );
       return t;
     }
diff --git a/src/sisudoc/io_out/latex.d b/src/sisudoc/io_out/latex.d
index 771bc57..e1b5731 100644
--- a/src/sisudoc/io_out/latex.d
+++ b/src/sisudoc/io_out/latex.d
@@ -320,7 +320,6 @@ template paperLaTeX() {
 }
 template outputLaTeX() {
   import
-    std.digest.sha,
     std.file,
     std.outbuffer,
     std.uri,
diff --git a/src/sisudoc/io_out/odt.d b/src/sisudoc/io_out/odt.d
index d6ac27d..0450509 100644
--- a/src/sisudoc/io_out/odt.d
+++ b/src/sisudoc/io_out/odt.d
@@ -55,7 +55,6 @@ template formatODT() {
     sisudoc.io_out.rgx,
     sisudoc.io_out.rgx_xhtml;
   import
-    std.digest.sha,
     std.file,
     std.outbuffer,
     std.uri,
@@ -651,7 +650,6 @@ template outputODT() {
     sisudoc.io_out.rgx,
     sisudoc.io_out.rgx_xhtml;
   import
-    std.digest.sha,
     std.file,
     std.outbuffer,
     std.uri,
diff --git a/src/sisudoc/meta/metadoc.d b/src/sisudoc/meta/metadoc.d
index a1899da..ed9a5b1 100644
--- a/src/sisudoc/meta/metadoc.d
+++ b/src/sisudoc/meta/metadoc.d
@@ -64,7 +64,6 @@ template spineAbstraction() {
     sisudoc.io_out.hub;
   mixin spineBiblio;
   mixin outputHub;
-  enum headBody { header, body_content, insert_file_list, image_list }
   enum makeMeta { make, meta }
   enum docAbst  { doc_abstract_obj, doc_has }
   @system auto spineAbstraction(E,P,O,Cfg,M,S)(
@@ -89,7 +88,6 @@ template spineAbstraction() {
     }
     auto _header_body_insertfilelist_imagelist
       = spineRawMarkupContent!()(_opt_action, _manifest.src.path_and_fn);
-    static assert(_header_body_insertfilelist_imagelist.length==4);
     if ((_opt_action.debug_do)
       || (_opt_action.debug_do_stages)
     ) {
@@ -98,7 +96,7 @@ template spineAbstraction() {
     debug(header_and_body) {
       writeln(header);
       writeln(_header_body_insertfilelist_imagelist.length);
-      writeln(_header_body_insertfilelist_imagelist.length[headBody.body_content][0]);
+      // writeln(_header_body_insertfilelist_imagelist.length.body_content[0]);
     }
     /+ ↓ split header into make and meta +/
     if ((_opt_action.debug_do)
@@ -109,7 +107,7 @@ template spineAbstraction() {
     import sisudoc.meta.conf_make_meta_yaml;
     _make_and_meta_struct =
       docHeaderMakeAndMetaTupYamlExtractAndConvertToStruct!()(
-        _header_body_insertfilelist_imagelist[headBody.header],
+        _header_body_insertfilelist_imagelist.header_raw,
         _make_and_meta_struct,
         _manifest,
         _opt_action,
@@ -127,7 +125,7 @@ template spineAbstraction() {
       writeln("step3 commence → (document abstraction (da); da keys; segnames; doc_matters) [", _manifest.src.filename, "]");
     }
     auto da = docAbstraction!()(
-      _header_body_insertfilelist_imagelist[headBody.body_content],
+      _header_body_insertfilelist_imagelist.sourcefile_body_content,
       _make_and_meta_struct,
       _opt_action,
       _manifest,
@@ -275,7 +273,7 @@ template spineAbstraction() {
       auto srcs() {
         struct SRC_ {
           auto file_insert_list() {
-            return _header_body_insertfilelist_imagelist[headBody.insert_file_list];
+            return _header_body_insertfilelist_imagelist.insert_file_list;
           }
           auto image_list() {
             return _doc_has_struct.imagelist;
diff --git a/src/sisudoc/meta/metadoc_from_src.d b/src/sisudoc/meta/metadoc_from_src.d
index 32954f1..4bd747d 100644
--- a/src/sisudoc/meta/metadoc_from_src.d
+++ b/src/sisudoc/meta/metadoc_from_src.d
@@ -57,6 +57,7 @@ template docAbstraction() {
   import
     std.algorithm,
     std.container,
+    std.digest.sha,
     std.file,
     std.json,
     std.path;
@@ -970,8 +971,7 @@ template docAbstraction() {
       }
       obj = _links(obj);
     }
-    if (the_document_toc_section.length > 1) {
-      // scroll
+    if (the_document_toc_section.length > 1) { // writeln("toc"); // scroll
       dom_structure_markedup_tags_status_buffer = dom_structure_markedup_tags_status.dup;
       dom_structure_collapsed_tags_status_buffer = dom_structure_collapsed_tags_status.dup;
       foreach (ref obj; the_document_toc_section) {
@@ -997,7 +997,7 @@ template docAbstraction() {
     // images
     string[] _images;
     // multiple 1~ levels, loop through document body
-    if (the_document_body_section.length > 1) {
+    if (the_document_body_section.length > 1) { // writeln("body");
       foreach (ref obj; the_document_body_section) {
         if (!(obj.metainfo.identifier.empty)) {
           if (!(((obj.metainfo.identifier) in tag_assoc)
@@ -1033,12 +1033,26 @@ template docAbstraction() {
            _images ~= extract_images(obj.text);
            obj = _image_dimensions(obj, manifested);
         }
+        obj.metainfo.sha256 = obj.obj_digest;
         obj = _links(obj);
       }
     }
-    auto image_list = (_images.sort()).uniq;
+    auto image_list = (_images.sort()).uniq; // also get digest on each image here? // workon
+    if (_images.length > 0) {
+      foreach (img; image_list) {
+        try { // also get sha digest on image file
+          // read_image
+          auto data = (cast(byte[]) (manifested.src.image_dir_path ~ "/" ~ img).read);
+          // calculate, digest, hash
+          writefln("%s\n%-(%02x%)::%s ⋅ %s", img, data.sha256Of, data.length, img);
+          writefln("%-(%02x%) ⋅ %s ⋅ %s", data.sha256Of, img, data.length);
+        } catch (Exception ex) {
+          writeln("WARNING, image not found: ", img, "\n  ", manifested.src.image_dir_path ~ "/" ~ img);
+        }
+      }
+    }
     // endnotes optional only one 1~ level
-    if (the_document_endnotes_section.length > 1) {
+    if (the_document_endnotes_section.length > 1) { // writeln("endnotes");
       dom_structure_markedup_tags_status_buffer           = dom_structure_markedup_tags_status.dup;
       dom_structure_collapsed_tags_status_buffer          = dom_structure_collapsed_tags_status.dup;
       dom_structure_markedup_tags_status                  = dom_structure_markedup_tags_status_buffer.dup;
@@ -1073,7 +1087,7 @@ template docAbstraction() {
       }
     }
     // glossary optional only one 1~ level
-    if (the_document_glossary_section.length > 1) {
+    if (the_document_glossary_section.length > 1) { // writeln("glossary");
       foreach (ref obj; the_document_glossary_section) {
         if (obj.metainfo.is_a == "heading") {
           debug(dom) { writeln(obj.text); }
@@ -1104,11 +1118,12 @@ template docAbstraction() {
           obj.metainfo.ocn        = obj_cite_digits.object_number;
           obj.metainfo.identifier = obj_cite_digits.identifier;
         }
+        obj.metainfo.sha256 = obj.obj_digest;
         obj = _links(obj);
       }
     }
     // bibliography optional only one 1~ level
-    if (the_document_bibliography_section.length > 1) {
+    if (the_document_bibliography_section.length > 1) { // writeln("bibliography");
       foreach (ref obj; the_document_bibliography_section) {
         if (obj.metainfo.is_a == "heading") {
           debug(dom) { writeln(obj.text); }
@@ -1139,6 +1154,7 @@ template docAbstraction() {
           obj.metainfo.ocn                                = obj_cite_digits.object_number;
           obj.metainfo.identifier                         = obj_cite_digits.identifier;
         }
+        obj.metainfo.sha256 = obj.obj_digest;
         obj = _links(obj);
       }
     }
@@ -1146,7 +1162,7 @@ template docAbstraction() {
     int ocn_       = obj_cite_digits.object_number;
     int ocn_bkidx_ = 0;
     int ocn_bidx_;
-    if (the_document_bookindex_section.length > 1) {                                        // scroll
+    if (the_document_bookindex_section.length > 1) { // writeln("book index");                                        // scroll
       dom_structure_markedup_tags_status_buffer = dom_structure_markedup_tags_status.dup;
       dom_structure_collapsed_tags_status_buffer = dom_structure_collapsed_tags_status.dup;
       foreach (ref obj; the_document_bookindex_section) {
@@ -1183,13 +1199,14 @@ template docAbstraction() {
           obj.metainfo.o_n_book_index                     = obj_cite_digits.bkidx;
           obj.metainfo.object_number_type                 = OCNtype.bkidx;
         }
+        obj.metainfo.sha256 = obj.obj_digest;
         obj = _links(obj);
       }
       // TODO assert failure, reinstate
       // assert(obj_cite_digit_bkidx == ocn_bidx_ obj_cite_digit_bkidx ~ " == ocn_" ~ ocn_ ~ "?");
     }
     // blurb optional only one 1~ level
-    if (the_document_blurb_section.length > 1) {
+    if (the_document_blurb_section.length > 1) { // writeln("blurb");
       foreach (ref obj; the_document_blurb_section) {
         if (obj.metainfo.is_a == "heading") {
           debug(dom) { writeln(obj.text); }
@@ -1220,6 +1237,7 @@ template docAbstraction() {
           obj.metainfo.object_number_off                  = obj_cite_digits.off;
           obj.metainfo.object_number_type                 = OCNtype.non;
         }
+        obj.metainfo.sha256 = obj.obj_digest;
         obj = _links(obj);
       }
     }
diff --git a/src/sisudoc/meta/metadoc_from_src_functions.d b/src/sisudoc/meta/metadoc_from_src_functions.d
index 29e675c..b5956c0 100644
--- a/src/sisudoc/meta/metadoc_from_src_functions.d
+++ b/src/sisudoc/meta/metadoc_from_src_functions.d
@@ -54,18 +54,6 @@ module sisudoc.meta.metadoc_from_src_functions;
 @safe:
 template docAbstractionFunctions() {
   // ↓ abstraction imports
-  import
-    std.algorithm,
-    std.container,
-    std.file,
-    std.json,
-    std.path;
-  import
-    sisudoc.meta,
-    sisudoc.meta.defaults,
-    sisudoc.meta.rgx,
-    sisudoc.meta.metadoc_object_setter,
-    sisudoc.meta.rgx;
   // ↓ abstraction mixins
   mixin ObjectSetter;
   mixin InternalMarkup;
@@ -2998,6 +2986,19 @@ template docAbstractionFunctions() {
     return obj;
   }
   // ↑ - object tags
+  // ↓ - object digest
+  pure ubyte[32] obj_digest()(
+    ObjGenericComposite  obj,
+  ) {
+    obj.metainfo.sha256 = obj.text.sha256Of;
+    // if (obj.metainfo.is_a == "heading") {
+    //   writeln(obj.metainfo.sha256.toHexString, " ", obj.metainfo.ocn, " ", obj.metainfo.is_a, " ", obj.metainfo.heading_lev_markup);
+    // } else {
+    //   writeln(obj.metainfo.sha256.toHexString, " ", obj.metainfo.ocn, " ", obj.metainfo.is_a);
+    // }
+    return obj.metainfo.sha256;
+  }
+  // ↑ - object digest
   // ↓ - table of contents
   @system ObjGenericComposite[] backmatter_gather_table_of_contents(
     ObjGenericComposite[] the_document_endnotes_section,
diff --git a/src/sisudoc/meta/metadoc_object_setter.d b/src/sisudoc/meta/metadoc_object_setter.d
index a2ceff6..8b2daf0 100644
--- a/src/sisudoc/meta/metadoc_object_setter.d
+++ b/src/sisudoc/meta/metadoc_object_setter.d
@@ -173,6 +173,7 @@ template ObjectSetter() {
     int                    parent_lev_markup                    = 0;
     int                    parent_ocn                           = 0;
     int                    last_descendant_ocn                  = 0;
+    ubyte[32]              sha256;
   }
   struct ObjGenericComposite {
     string                 text                                = "";