23 files changed, 986 insertions, 700 deletions
diff --git a/.env/echo-nixNote b/.env/echo-nixNote
deleted file mode 100644
index 9115d60..0000000
--- a/.env/echo-nixNote
+++ /dev/null
@@ -1,239 +0,0 @@
-echo '-*- mode: org -*-
-
-* nixpkgs path?
-
-  # eval "$(nix print-dev-env)"
-' > nixNote_.org
-
-echo "  <nixpkgs> == `nix-instantiate --find-file nixpkgs`" >> nixNote_.org
-
-echo '
-* nix build and show derivation
-
-#+BEGIN_SRC sh
-nix-shell --pure
-
-nix-build
-nix build -f default.nix --print-build-logs
-nix shell -f default.nix --print-build-logs
-nix develop --build -f derivation.nix -I .envrc --print-build-logs
-
-nix-instantiate | nix-build
-
-nix-instantiate -I .envrc | nix-build -I .envrc
-nix build `nix-instantiate`
-nix build `nix-instantiate -I .envrc`
-
-nix develop
-
-nix-instantiate | nix show-derivation | jq
-nix-instantiate -I .envrc | nix show-derivation -f derivation.nix -I .envrc | jq
-
-nix-instantiate | nix show-derivation --recursive | jq
-nix-instantiate -I .envrc | nix show-derivation -f derivation.nix --recursive -I .envrc | jq
-
-nix search --json 2>/dev/null |jq
-#+END_SRC
-
-* version and build info
-
-#+BEGIN_SRC sh' >> nixNote_.org
-
-echo 'spine version (git) == $SpineVER' >> nixNote_.org
-echo "spine version (git) == $SpineVER" >> nixNote_.org
-echo 'nix-instantiate == `nix-instantiate`' >> nixNote_.org
-echo "nix-instantiate == `nix-instantiate`" >> nixNote_.org
-
-echo "#+END_SRC
-
-* initialised shell variables
-
-#+BEGIN_SRC sh
-SpineSRC=$SpineSRC
-SpineDOC=$SpineDOC
-SpinePOD=$SpinePOD
-SpineOUTversioned=$SpineOUTversioned
-SpineOUT=$SpineOUT
-#+END_SRC
-" >> nixNote_.org
-
-echo '* spine run instruction examples
-** parallelized tasks
-*** doc source
-
-#+BEGIN_SRC sh
-$SpineBIN/spine --very-verbose --pod --source --output="$SpineOUTversioned" $SpinePOD/*
-#+END_SRC
-
-*** html & epub output
-
-#+BEGIN_SRC sh
-$SpineBIN/spine --very-verbose --html --epub --output="$SpineOUTversioned" $SpinePOD/*
-#+END_SRC
-
-*** sqlite db for each document - populate each db
-
-#+BEGIN_SRC sh
-$SpineBIN/spine --very-verbose --sqlite-discrete --output="$SpineOUTversioned" $SpinePOD/*
-#+END_SRC
-
-*** doc source; html, epub; sqlite outputs
-
-#+BEGIN_SRC sh
-$SpineBIN/spine --verbose --pod --html --epub --sqlite-discrete --output="$SpineOUTversioned" $SpinePOD/*
-#+END_SRC
-
-*** curate (authors topics)
-
-#+BEGIN_SRC sh
-$SpineBIN/spine --very-verbose --curate --output="$SpineOUTversioned" $SpinePOD/*
-#+END_SRC
-
-*** html, curate
-
-#+BEGIN_SRC sh
-$SpineBIN/spine --verbose --dark --html --html-link-curate --curate --output="$SpineOUTversioned" $SpinePOD/*
-$SpineBIN/spine --very-verbose --html --html-link-curate --curate --output="$SpineOUTversioned" $SpinePOD/*
-#+END_SRC
-
-*** composite command: source pod, html, epub, curate, sqlite
-
-#+BEGIN_SRC sh
-$SpineBIN/spine --verbose --dark --pod --epub --html --html-link-curate --curate --sqlite-discrete --output="$SpineOUTversioned" $SpinePOD/*
-#+END_SRC
-
-** sequential tasks
-*** sqlite db (shared) - create db
-
-#+BEGIN_SRC sh
-$SpineBIN/spine --very-verbose --sqlite-db-create --output="$SpineOUTversioned"
-#+END_SRC
-
-*** sqlite db (shared) - populate db
-
-#+BEGIN_SRC sh
-$SpineBIN/spine --very-verbose --sqlite-update --output="$SpineOUTversioned" $SpineDOC/sisudoc-spine-markup-samples/markup/pod/*
-#+END_SRC
-
-*** sqlite db (shared) - drop db
-
-#+BEGIN_SRC sh
-$SpineBIN/spine --very-verbose --sqlite-db-drop --output="$SpineOUTversioned"
-#+END_SRC
-
-*** sqlite db (shared) - create & populate db (single step)
-
-#+BEGIN_SRC sh
-$SpineBIN/spine --very-verbose --sqlite-db-create --sqlite-update --output="$SpineOUTversioned" $SpinePOD/*
-#+END_SRC
-
-*** composite command: source pod, html, epub, curate, sqlite
-
-#+BEGIN_SRC sh
-$SpineBIN/spine --verbose --no-parallel --dark --pod --epub --html --html-link-curate --curate --sqlite-discrete --output="$SpineOUTversioned" $SpinePOD/*
-#+END_SRC
-
-** config [./pod/].dr/config_local_site
-
-#+BEGIN_SRC sh
-cat $SpinePOD/.dr/config_local_site
-$SpineBIN/spine --show-config $SpinePOD
-$SpineBIN/spine --show-config --output="$SpineOUTversioned" $SpinePOD
-#+END_SRC
-
-** cgi operations (output to $SpineOUT /var/www)
-
-#+BEGIN_SRC sh
-$SpineBIN/spine --very-verbose --sqlite-db-create --output="$SpineOUT" $SpinePOD/*
-
-$SpineBIN/spine -v --cgi-search-form-codegen --output=$SpineOUT $SpinePOD/*
-
-$SpineBIN/spine -v --show-config --config=$SpinePOD/.dr
-
-$SpineBIN/spine --html $SpinePOD/*
-
-
-$SpineBIN/spine -v --cgi-search-form-codegen --config=$SpinePOD/.dr/config_local_site
-#+END_SRC
-
-*** generate html linked to search form
-
-#+BEGIN_SRC sh
-$SpineBIN/spine -v --html --html-link-search --html-link-curate --curate  --output=$SpineOUT $SpinePOD/*
-#+END_SRC
-
-*** create or re-create sql db (--sqlite-db-create or --sqlite-db-recreate)
-
-#+BEGIN_SRC sh
-$SpineBIN/spine -v --sqlite-db-create --sqlite-db-filename="" --sqlite-db-path="$SpineDBpath"
-$SpineBIN/spine -v --sqlite-db-recreate --sqlite-db-filename="" --sqlite-db-path="$SpineDBpath"
-#+END_SRC
-
-*** populate sqlite db
-
-#+BEGIN_SRC sh
-$SpineBIN/spine -v --sqlite-update --sqlite-db-filename="" --output=$SpineOUT $SpinePOD/*
-#+END_SRC
-
-*** generate html (linked to search form), sql output, curate COMPOSITE
-
-#+BEGIN_SRC sh
-$SpineBIN/spine -v --html --html-link-search --html-link-curate --curate --sqlite-update --sqlite-db-filename="" --cgi-sqlite-search-filename="" --sqlite-db-path="$SpineDBpath" --output="$SpineOUT" $SpinePOD/*
-$SpineBIN/spine --epub --html --html-link-search --html-link-curate --curate --sqlite-update --sqlite-db-filename="spine.search.db" --cgi-sqlite-search-filename="spine_search" --cgi-url-action="https://sisudoc.org/spine_search" --ouput="$SpineOUT" $SpinePOD/*
-#+END_SRC
-
-*** generate html (linked to search form), sql output, curate COMPOSITE with resource configuration
-
-if names and paths are configured in resource configuration file, e.g. $SpinePOD/.rc/config_local_site
-
-#+BEGIN_SRC sh
-$SpineBIN/spine -v --html --html-link-search --html-link-curate --curate --sqlite-update $SpinePOD/*
-#+END_SRC
-
-#+BEGIN_SRC yaml
-# sample resource configuration file ( $SpinePOD/.rc/config_local_site )
-output:
-  path:                        "/srv/www/spine"
-default:
-  language:                    "en"
-  papersize:                   "a4"
-  text_wrap:                   "80"
-  digest:                      "sha256"
-webserv:
-  http:                        "http"
-  domain:                      "localhost"
-  data_http:                   "http"
-  data_domain:                 "localhost"
-  data_root_url:               "https://sisudoc.org"
-  data_root_path:              "/srv/www/spine"
-  images_root_part:            "image"
-  cgi_search_form_title:       "≅ SiSU Spine search ፨"
-  cgi_http:                    "https"
-  cgi_domain:                  "sisudoc.org"
-  cgi_bin_url:                 "http://sisudoc.org/cgi-bin"
-  cgi_bin_part:                "cgi-bin"
-  cgi_bin_path:                "/var/www/cgi/cgi-bin"
-  cgi_search_script:           ""
-  cgi_action:                  "https://sisudoc.org/spine_search"
-  db_sqlite_filename:          ""
-  db_sqlite_path:              "/var/www/sqlite"
-#+END_SRC
-
-*** make search form
-
-#+BEGIN_SRC sh
-$SpineBIN/spine -v --cgi-search-form-codegen --config=$SpinePOD/.dr/config_local_site
-#+END_SRC
-
-*** latex
-
-#+BEGIN_SRC sh
-$SpineBIN/spine --latex --serial --output="$SpineOUT" $SpinePOD/*
-ls $SpineOutstatic/latex/*.tex
-#+END_SRC
-' >> nixNote_.org
-
-#cat nixNote_.org
-
-#echo "emacs nixNote_.org"
-#echo "cat nixNote_.org"
diff --git a/.env/nix-commands b/.env/nix-commands
deleted file mode 100644
index 8a16dbf..0000000
--- a/.env/nix-commands
+++ /dev/null
@@ -1,20 +0,0 @@
-- nix flake update && nix flake check --show-trace && nix flake show && nix develop .#devShell
-
-- nix build ".#default" --print-build-logs
-- nix build ".#spine-dmd" --print-build-logs
-- nix build ".#spine-ldc" --print-build-logs
-- nix build ".#spine-gdc" --print-build-logs
-
-- nix develop
-  - nix develop ".#devShell" --print-build-logs
-  - nix develop ".#devShell-html" --print-build-logs
-  - nix develop ".#devShell-epub" --print-build-logs
-  - nix develop ".#devShell-latex-pdf" --print-build-logs
-  - nix develop ".#devShell-sqlite" --print-build-logs
-  - nix develop ".#devShell-i18n" --print-build-logs
-
-nix run .#default --print-build-logs
-
-nix develop --build ".#default" --print-build-logs
-
-nix-shell '<nixpkgs>' -A nix --pure
diff --git a/.envrc-local b/.envrc-local
index 74e98e0..8f0dbb3 100644
--- a/.envrc-local
+++ b/.envrc-local
@@ -1,12 +1,10 @@
 export SpineBIN=./result/bin/spine
 # ❯❯ nix builds spine binary:
 #export SpineBIN=./result/bin/spine
-# ❯❯ if from ../sisudoc-spine on directory tree nix build
-#export SpineBIN=../sisudoc-spine/result/bin/spine
-# ❯❯ dub builds spine binary (name depends on build, check):
-#export SpineBIN=../sisudoc-spine/bin/spine
-#export SpineBIN=../sisudoc-spine/bin/spine-ldc
-#export SpineBIN=../sisudoc-spine/bin/spine-dmd
+# ❯❯ dub builds spine binary (name depends on build, check, not available here):
+#export SpineBIN=./bin/spine
+#export SpineBIN=./bin/spine-ldc
+#export SpineBIN=./bin/spine-dmd
 # ❯❯ location of source files:
 export SpineDOC=.
 # ❯❯ location of source files pod:
diff --git a/.envrc-local_ b/.envrc-local_
index 74e98e0..8f0dbb3 100644
--- a/.envrc-local_
+++ b/.envrc-local_
@@ -1,12 +1,10 @@
 export SpineBIN=./result/bin/spine
 # ❯❯ nix builds spine binary:
 #export SpineBIN=./result/bin/spine
-# ❯❯ if from ../sisudoc-spine on directory tree nix build
-#export SpineBIN=../sisudoc-spine/result/bin/spine
-# ❯❯ dub builds spine binary (name depends on build, check):
-#export SpineBIN=../sisudoc-spine/bin/spine
-#export SpineBIN=../sisudoc-spine/bin/spine-ldc
-#export SpineBIN=../sisudoc-spine/bin/spine-dmd
+# ❯❯ dub builds spine binary (name depends on build, check, not available here):
+#export SpineBIN=./bin/spine
+#export SpineBIN=./bin/spine-ldc
+#export SpineBIN=./bin/spine-dmd
 # ❯❯ location of source files:
 export SpineDOC=.
 # ❯❯ location of source files pod:
diff --git a/.envrc-nix b/.envrc-nix
index 06d405b..671458e 100644
--- a/.envrc-nix
+++ b/.envrc-nix
@@ -1,7 +1,7 @@
 NIX_ENFORCE_PURITY=1
 # - https://github.com/nix-community/nix-direnv
-NixDirEnvVersion="3.0.4"
-NixDirEnvSHA="sha256-DzlYZ33mWF/Gs8DDeyjr8mnVmQGx7ASYqA5WlxwvBG4="
+NixDirEnvVersion="3.0.7"
+NixDirEnvSHA="sha256-bn8WANE5a91RusFmRI7kS751ApelG02nMcwRekC/qzc="
 if ! has nix_direnv_version || ! nix_direnv_version ${NixDirEnvVersion}; then
   source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/${NixDirEnvVersion}/direnvrc" "${NixDirEnvSHA}"
 fi
@@ -16,49 +16,55 @@ PATH_add result/bin
 use flake .
 #use flake .#default
 echo '
-- consider running:
+• consider running:
   ❯❯ nix flake show
   ❯❯ nix flake update && nix flake check && nix flake show
 
-- for a dev shell (development environment):
+• for a dev shell (development environment):
+  • nix develop
+    ❯❯ nix develop ".#" --print-build-logs -c zsh
+  • nix develop some specialized shells (tools)
+    ❯❯ nix develop ".#dsh-epub" --print-build-logs -c zsh
+    ❯❯ nix develop ".#dsh-html" --print-build-logs -c zsh
+    ❯❯ nix develop ".#dsh-i18n" --print-build-logs -c zsh
+    ❯❯ nix develop ".#dsh-latex-pdf" --print-build-logs -c zsh
+    ❯❯ nix develop ".#dsh-spine" --print-build-logs -c zsh
+    ❯❯ nix develop ".#dsh-sqlite" --print-build-logs -c zsh
+  • nix develop using nixpkgs
+    ❯❯ nix develop ".#dsh-nixpkgs-dmd" --print-build-logs -c zsh
+    ❯❯ nix develop ".#dsh-nixpkgs-ldc" --print-build-logs -c zsh
+  • nix develop using package overlays: (dmd-2.111.0, ldc-1.41.0, dub-1.39.0, dtools-2.110.0)
+    ❯❯ nix develop ".#dsh-overlay-dmd" --print-build-logs -c zsh
+    ❯❯ nix develop ".#dsh-overlay-ldc" --print-build-logs -c zsh
+  • for more nix develop specialized shells
+    ❯❯ nix flake show
 
-  ❯❯ nix develop
-  ❯❯ nix develop ".#" --print-build-logs -c zsh
-  ❯❯ nix develop ".#dsh" --print-build-logs -c zsh
-  ❯❯ nix develop ".#dsh-epub" --print-build-logs -c zsh
-  ❯❯ nix develop ".#dsh-html" --print-build-logs -c zsh
-  ❯❯ nix develop ".#dsh-i18n" --print-build-logs -c zsh
-  ❯❯ nix develop ".#dsh-latex-pdf" --print-build-logs -c zsh
-  ❯❯ nix develop ".#dsh-overlay-ldc" --print-build-logs -c zsh
-  ❯❯ nix develop ".#dsh-spine" --print-build-logs -c zsh
-  ❯❯ nix develop ".#dsh-sqlite" --print-build-logs -c zsh
+• to build project:
+  • nix flake set default
+    ❯❯ nix build --print-build-logs
+    ❯❯ nix build ".#" --print-build-logs
+    ❯❯ nix build ".#spine-nixpkgs-dmd" --print-build-logs
+    ❯❯ nix build ".#spine-nixpkgs-ldc" --print-build-logs
+  • nix build using package overlays: (dmd, ldc, dub, dtools)
+    ❯❯ nix build ".#spine-overlay-dmd" --print-build-logs
+    ❯❯ nix build ".#spine-overlay-ldc" --print-build-logs
 
-- to build project:
-
-  ❯❯ nix build --print-build-logs
-  ❯❯ nix build ".#" --print-build-logs
-
-- to build project:
-  ❯❯ nix build ".#spine-overlay-dmd" --print-build-logs
-  ❯❯ nix build ".#spine-overlay-ldc" --print-build-logs
-
-- to build using dub (on nix or otherwise):
+• to build using dub (on nix or otherwise):
 
   you need to be in sisudoc-spine to use source code tree directly.
 
-- for develop environment & build options
+• for develop environment & build options
 
   ❯❯ nix flake update && nix flake check && nix flake show
   ❯❯ nix flake show
 
-- if on nix: build the sisudoc-spine using nix build commands above and
+• if on nix: build the sisudoc-spine using nix build commands above and
   run the result against the sample files here in the sisudoc-spine-samples dir
   (assuming the appropriate paths have been set in your .envrc-local)
 
   ❯❯ ${SpineBIN} -v --source --pod --epub --html --html-link-curate --html-link-markup --curate --output=${SpineOUT} ${SpinePOD}/*
   ❯❯ ${SpineBIN} -v --source --pod --latex --latex-init --epub --html --html-link-pdf --html-link-curate --html-link-markup --curate --output=${SpineOUT} ${SpinePOD}/*
+
+  ❯❯ ${SpineBIN} -v --sqlite-db-create --sqlite-db-filename=${SpineSQLdb} --sqlite-db-path=./_tmp-db
+  ❯❯ ${SpineBIN} -v --sqlite-update --sqlite-db-filename=${SpineSQLdb} --sqlite-db-path=./_tmp-db ./markup/pod/*
 '
-echo "-
-  ❯❯ ${SpineBIN} -v --source --pod --epub --html --html-link-curate --html-link-markup --curate --output=${SpineOUT} ${SpinePOD}/*
-  ❯❯ ${SpineBIN} -v --source --pod --latex --latex-init --epub --html --html-link-pdf --html-link-curate --html-link-markup --curate --output=${SpineOUT} ${SpinePOD}/*
-"
diff --git a/.gitignore b/.gitignore
index d87c953..35596c0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,10 +14,8 @@
 !.envrc-local
 !.envrc-nix
 !.envrc-git-init
-!.env
-!.env/**
-!README
 !README.md
+!README
 !COPYRIGHT
 !CHANGELOG
 !makefile
@@ -25,6 +23,8 @@
 !configuration.txt
 !*.json
 !*.sdl
+!*.md
+!*.txt
 !tangle
 !*.org
 !org
@@ -74,15 +74,18 @@
 **/.dub/**
 tmp/**
 *_.org
+*_.md
+*_.txt
+*_.json
 *_.nix
 *_.d
 *_.txt
 *_
-!.envrc-local_
 *.swp
 *~
 \#*
 *.\#*
+!.envrc-local_
 #!*/
 #\#*
 #*.\#*
diff --git a/README b/README
index 7ec11cd..e3aed0e 100644
--- a/README
+++ b/README
@@ -86,9 +86,9 @@ instruction. The sources of relevant parts of the project are here:
   https://sisudoc.org
   https://git.sisudoc.org
 
-  git clone git://git.sisudoc.org/software/sisudoc-spine && \
-  git clone git://git.sisudoc.org/software/sisudoc-spine-search-cgi && \
-  git clone git://git.sisudoc.org/markup/sisudoc-spine-samples
+  git clone --depth=1 git://git.sisudoc.org/software/sisudoc-spine && \
+  git clone --depth=1 git://git.sisudoc.org/software/sisudoc-spine-search-cgi && \
+  git clone --depth=1 git://git.sisudoc.org/markup/sisudoc-spine-samples
 
 you may wish to clone these into a directory created for the purpose, e.g.
 
diff --git a/README.md b/README.md
index 7b7f43e..077cbbe 100644
--- a/README.md
+++ b/README.md
@@ -69,9 +69,9 @@ instruction. The sources of relevant parts of the project are here:
   https://sisudoc.org
   https://git.sisudoc.org
 
-  git clone git://git.sisudoc.org/software/sisudoc-spine && \
-  git clone git://git.sisudoc.org/software/sisudoc-spine-search-cgi && \
-  git clone git://git.sisudoc.org/markup/sisudoc-spine-samples
+  git clone --depth=1 git://git.sisudoc.org/software/sisudoc-spine && \
+  git clone --depth=1 git://git.sisudoc.org/software/sisudoc-spine-search-cgi && \
+  git clone --depth=1 git://git.sisudoc.org/markup/sisudoc-spine-samples
 
 you may wish to clone these into a directory created for the purpose, e.g.
 
diff --git a/derivation.nix b/derivation.nix
index 09bbfd0..8f0364a 100644
--- a/derivation.nix
+++ b/derivation.nix
@@ -59,7 +59,7 @@ with (
                 exit "Error: could not find D compiler"
               fi
               echo "$DC_ used as D compiler to build $pname"
-              dub run --compiler=$DC --build=release --combined --skip-registry=all
+              dub build --compiler=$DC --build=release --combined --skip-registry=all
               runHook postBuild
             '';
             checkPhase = ''
@@ -92,14 +92,14 @@ with (
 );
   mkDubDerivation rec {
     pname = "spine";
-    version = "0.16.0";
+    version = "0.18.0";
     #zipfile = "spine-0.12.0-tag-0.11.2.r107.gf89a107.tar.gz";
     src = fetchTarball {
       url = "file:///home/ralph/grotto/repo/git.repo/projects/doc-reform/code/software/tarball/spine-0.12.0-tag-0.11.2.r107.gf89a107.tar.gz";
       sha256 = "sha256:03dr7dn7kq6arw4ry7qar13iqmi1caw70imfjwi8qr7g2j4mnk2q";
     };
     nativeBuildInputs = with pkgs; [dub ldc];
-    buildInputs = with pkgs; [nixVersions.nix_2_21 sqlite];
+    buildInputs = with pkgs; [nixVersions.latest sqlite];
     meta = with pkgs.lib; {
       description = "A sisu like parser & document generator";
       longDescription = ''
diff --git a/devenv.nix b/devenv.nix
index d9a183d..6206346 100644
--- a/devenv.nix
+++ b/devenv.nix
@@ -10,13 +10,13 @@ with pkgs;
       # ❯❯❯ nix_related
       #nix # if not on NixOS, this is needed
       direnv
-      nixVersions.nix_2_21 #nixVersions.latest #nixVersions.git
+      nixVersions.latest #nixVersions.latest #nixVersions.git #nixVersions.nix_2_29 #nixVersions.nix_2_29
       nix-prefetch-git
       validatePkgConfig
       nix-output-monitor
       nix-tree
-      jq
-      #alejandra
+      jq #gx
+      #nixfmt-rfc-style
       git
       # ❯❯❯ dev
       gnumake
diff --git a/flake.lock b/flake.lock
index b8a1342..9014853 100644
--- a/flake.lock
+++ b/flake.lock
@@ -2,17 +2,16 @@
   "nodes": {
     "d-overlay": {
       "inputs": {
-        "flake-utils": "flake-utils",
         "nixpkgs": [
           "nixpkgs"
         ]
       },
       "locked": {
-        "lastModified": 1715403580,
-        "narHash": "sha256-wq/XlLtczq7BeCZPphK7fjo9MYlE8di8XavJCGayFDo=",
+        "lastModified": 1749310555,
+        "narHash": "sha256-QRkhrRy6wLBBjSlVTQgjoCsiL5HUJa/nPAOGoNmAkzw=",
         "ref": "refs/heads/main",
-        "rev": "fe1a1704a2e9d739872a0dd53756ee1b9d56da19",
-        "revCount": 8,
+        "rev": "03160d6114c3fb835b079f20797dac6b88ab5cbc",
+        "revCount": 22,
         "type": "git",
         "url": "git://git.sisudoc.org/package/dlang-nix-overlays-and-flake"
       },
@@ -21,67 +20,13 @@
         "url": "git://git.sisudoc.org/package/dlang-nix-overlays-and-flake"
       }
     },
-    "flake-utils": {
-      "inputs": {
-        "systems": "systems"
-      },
-      "locked": {
-        "lastModified": 1710146030,
-        "narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "type": "github"
-      }
-    },
-    "flake-utils_2": {
-      "inputs": {
-        "systems": "systems_2"
-      },
-      "locked": {
-        "lastModified": 1710146030,
-        "narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "type": "github"
-      }
-    },
-    "flake-utils_3": {
-      "inputs": {
-        "systems": "systems_3"
-      },
-      "locked": {
-        "lastModified": 1710146030,
-        "narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "type": "github"
-      }
-    },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1716715802,
-        "narHash": "sha256-usk0vE7VlxPX8jOavrtpOqphdfqEQpf9lgedlY/r66c=",
+        "lastModified": 1749401433,
+        "narHash": "sha256-HXIQzULIG/MEUW2Q/Ss47oE3QrjxvpUX7gUl4Xp6lnc=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "e2dd4e18cc1c7314e24154331bae07df76eb582f",
+        "rev": "08fcb0dcb59df0344652b38ea6326a2d8271baff",
         "type": "github"
       },
       "original": {
@@ -94,24 +39,22 @@
     "root": {
       "inputs": {
         "d-overlay": "d-overlay",
-        "flake-utils": "flake-utils_2",
         "nixpkgs": "nixpkgs",
         "spine": "spine"
       }
     },
     "spine": {
       "inputs": {
-        "flake-utils": "flake-utils_3",
         "nixpkgs": [
           "nixpkgs"
         ]
       },
       "locked": {
-        "lastModified": 1716409313,
-        "narHash": "sha256-V1oggLDwjQUaPgO7P0QjCra1Tc5J/jaRmMNZ+GqxLqQ=",
+        "lastModified": 1749307805,
+        "narHash": "sha256-N0TlfLqjXapQEuvrGeUq0NEvbXAXlCQgk8P5v2K/aBc=",
         "ref": "refs/heads/main",
-        "rev": "9876842de60c9c0d94b47a2589623d235607050c",
-        "revCount": 644,
+        "rev": "311d82d0f73e60e537f7c2f2f535586945ce0e06",
+        "revCount": 681,
         "type": "git",
         "url": "git://git.sisudoc.org/software/sisudoc-spine"
       },
@@ -119,51 +62,6 @@
         "type": "git",
         "url": "git://git.sisudoc.org/software/sisudoc-spine"
       }
-    },
-    "systems": {
-      "locked": {
-        "lastModified": 1681028828,
-        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
-        "owner": "nix-systems",
-        "repo": "default",
-        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-systems",
-        "repo": "default",
-        "type": "github"
-      }
-    },
-    "systems_2": {
-      "locked": {
-        "lastModified": 1681028828,
-        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
-        "owner": "nix-systems",
-        "repo": "default",
-        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-systems",
-        "repo": "default",
-        "type": "github"
-      }
-    },
-    "systems_3": {
-      "locked": {
-        "lastModified": 1681028828,
-        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
-        "owner": "nix-systems",
-        "repo": "default",
-        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-systems",
-        "repo": "default",
-        "type": "github"
-      }
     }
   },
   "root": "root",
diff --git a/flake.nix b/flake.nix
index eb6d89e..a927b24 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,7 +1,6 @@
 {
   description = "spine (sisu like parser & document generator) made available to process markup samples";
   inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
-  inputs.flake-utils.url = "github:numtide/flake-utils";
   inputs.spine = {
     url = "git://git.sisudoc.org/software/sisudoc-spine";
     inputs.nixpkgs.follows = "nixpkgs";
@@ -15,11 +14,11 @@
   outputs = {
     self,
     nixpkgs,
-    flake-utils,
     spine,
     d-overlay,
+    ...
   } @ inputs: let
-    version = "0.16.0";
+    version = "0.18.0";
     shell = ./shell.nix;
     devEnv = ./nixDevEnv.sh;
     supportedSystems = ["x86_64-linux"]; # [ "x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin" ];
@@ -30,9 +29,9 @@
       pkgs = nixpkgsFor.${system};
     in {
       default = spine.packages.${system}.default;
-      #spine-nixpkgs-dmd = spine.packages.${system}.spine-nixpkgs-dmd;
+      spine-nixpkgs-dmd = spine.packages.${system}.spine-nixpkgs-dmd;
       spine-overlay-dmd = spine.packages.${system}.spine-overlay-dmd;
-      #spine-nixpkgs-ldc = spine.packages.${system}.spine-nixpkgs-ldc;
+      spine-nixpkgs-ldc = spine.packages.${system}.spine-nixpkgs-ldc;
       spine-overlay-ldc = spine.packages.${system}.spine-overlay-ldc;
       #vendorSha256 = "sha256-0Q00000000000000000000000000000000000000000=";
     });
@@ -45,9 +44,9 @@
     devShells = forAllSystems (system: let
       pkgs = nixpkgsFor.${system};
       shellHook = ''
+        export DFLAGS="-O2 -boundscheck=on"
         export Date=`date "+%Y%m%d"`
         ## set local values in .envrc-local (or here if you must)
-        echo "  ❯❯ ./result/bin/spine -v --source --pod --epub --html --html-link-pdf --html-link-curate --html-link-markup --curate --output=./OUTPUT_TEST_sisudocSpine ./markup/pod/*";
       '';
     in
       with pkgs; {
@@ -70,7 +69,7 @@
         dsh-overlay-ldc = d-overlay.devShells.${system}.dsh-overlay-ldc-dub;
         dsh-nixpkgs-ldc = d-overlay.devShells.${system}.dsh-nixpkgs-ldc-dub;
         dsh-epub = mkShell {
-          name = "spine dev shell for epub output";
+          name = "spine-0.18.0 dev shell for epub output";
           inherit shell;
           inherit devEnv;
           packages = [
@@ -98,7 +97,7 @@
           inherit shellHook;
         };
         dsh-html = mkShell {
-          name = "spine dev shell for latex & pdf output";
+          name = "spine-0.18.0 dev shell for html output";
           inherit shell;
           inherit devEnv;
           packages = [
@@ -118,7 +117,7 @@
           inherit shellHook;
         };
         dsh-latex-pdf = mkShell {
-          name = "spine dev shell for latex & pdf output";
+          name = "spine-0.18.0 dev shell for latex & pdf output";
           inherit shell;
           inherit devEnv;
           packages = [
@@ -134,7 +133,7 @@
           inherit shellHook;
         };
         dsh-sqlite = mkShell {
-          name = "spine dev shell for latex & pdf output";
+          name = "spine-0.18.0 dev shell for sqlite3 output";
           inherit shell;
           inherit devEnv;
           packages = [
@@ -147,7 +146,7 @@
           inherit shellHook;
         };
         dsh-i18n = mkShell {
-          name = "spine dev shell internationalization, po4a";
+          name = "spine-0.18.0 dev shell for internationalization, po4a";
           inherit shell;
           inherit devEnv;
           packages = [
diff --git a/makefile b/makefile
index 0bde8ce..c11bc39 100644
--- a/makefile
+++ b/makefile
@@ -811,8 +811,8 @@ gitsnapshot: distclean tangle
 #   find data/sisudir/media/text -name *.ss[tm] | sort
 
 version_tag:
-	echo "DRV=0.16.0; git tag -f doc-reform-markup-samples_v$$\{DRV} -m\"doc-reform markup-samples spine-$$\{DRV}\" HEAD"; \
-	echo "git tag -f doc-reform-markup-samples_v0.16.0 -m\"doc-reform markup-samples spine-0.16.0\" HEAD";
+	echo "DRV=0.18.0; git tag -f doc-reform-markup-samples_v$$\{DRV} -m\"doc-reform markup-samples spine-$$\{DRV}\" HEAD"; \
+	echo "git tag -f doc-reform-markup-samples_v0.18.0 -m\"doc-reform markup-samples spine-0.18.0\" HEAD";
 
 .PHONY : all build release \
 	distclean init \
diff --git a/markup/pod/not_without_help.austin_amissah/media/text/en/not_without_help.austin_amissah.sst b/markup/pod/not_without_help.austin_amissah/media/text/en/not_without_help.austin_amissah.sst
index ec92584..708cb21 100644
--- a/markup/pod/not_without_help.austin_amissah/media/text/en/not_without_help.austin_amissah.sst
+++ b/markup/pod/not_without_help.austin_amissah/media/text/en/not_without_help.austin_amissah.sst
@@ -66,7 +66,7 @@ The reader might find my constant references to associations with successful Gha
 
 --~#
 
-{nwh_amissah_thomas_paine.jpg 560x471 \\ One of Austin's favourite quotes, in his handwriting. }https://www.amissah.com/
+{nwh_amissah_thomas_paine.jpg 560x471 \\ In Austin's handwriting a favourite quotation. }https://www.amissah.com/
 
 "I believe religious duties consist in doing justice, loving, mercy and endeavouring to make our fellow citizens happy. My own mind is my church, and to do good is my religion." Thomas Paine
 
@@ -2253,7 +2253,7 @@ Married, 1956, to Stella (nee Mattsson); one son, Ralph, and two daughters, Tone
 
 2~ From Stella to Austin
 
-{nwh_amissah_austin_and_stella_1.jpg 560x425 "Austin & Stella Amissah" }https://www.amissah.com/
+{nwh_amissah_austin_and_stella_1.jpg 560x425 \\ Austin & Stella Amissah }https://www.amissah.com/
 
 Tomorrow
 
@@ -2263,7 +2263,7 @@ And to the broad shore, blue with waves, we shall walk down, slowly and quietly;
 
 John Henry Mackay set to music, in German, by Richard Strauss
 
-{nwh_amissah_austin_and_stella_2.jpg 560x420 }https://www.amissah.com/
+{nwh_amissah_austin_and_stella_2.jpg 560x420 \\ Austin & Stella Amissah }https://www.amissah.com/
 
 % CHECK
 
diff --git a/markup/sisudoc-spine-bespoke-output/html/homepage.index.html b/markup/sisudoc-spine-bespoke-output/html/homepage.index.html
index ddb3553..adf34f1 100644
--- a/markup/sisudoc-spine-bespoke-output/html/homepage.index.html
+++ b/markup/sisudoc-spine-bespoke-output/html/homepage.index.html
@@ -588,12 +588,14 @@ ralph.amissah www since 1993 ;-)
     [ <a href="https://discourse.nixos.org/t/nixos-foundation-board-giving-power-to-the-community/44552/">
       NixOS Foundation board: Giving power to the community
     </a> ]<br>
+<!--
     [ <a href="https://aux.computer/">
         Aux - aux.computer - a community fork of nix (under deliberation), billed as "An alternative to the Nix ecosystem"
     </a> ]
     [ <a href="https://forum.aux.computer/">
         community discussion (discourse)
     </a> ]<br>
+-->
     Gnu [ <a href="https://guix.gnu.org/">
         Guix
     </a> ]
diff --git a/org/config_env.org b/org/config_env.org
index ecf4ee5..6e8cbb1 100644
--- a/org/config_env.org
+++ b/org/config_env.org
@@ -4,7 +4,7 @@
 #+FILETAGS:    :spine:build:tools:
 #+AUTHOR:      Ralph Amissah
 #+EMAIL:       [[mailto:ralph.amissah@gmail.com][ralph.amissah@gmail.com]]
-#+COPYRIGHT:   Copyright (C) 2015 - 2024 Ralph Amissah
+#+COPYRIGHT:   Copyright (C) 2015 - 2025 Ralph Amissah
 #+LANGUAGE:    en
 #+STARTUP:     content hideblocks hidestars noindent entitiespretty
 #+PROPERTY:    header-args  :exports code
@@ -23,7 +23,7 @@
 ** nixDevEnv envrc :envrc:
 
 #+HEADER: :tangle ../nixDevEnv.sh
-#+BEGIN_SRC sh
+#+BEGIN_SRC shell
 if [ -f .envrc ]; then
   source_env_if_exists .envrc || source .envrc
 fi
@@ -33,7 +33,7 @@ fi
 
 #+NAME: envrc
 #+HEADER: :tangle ../.envrc
-#+BEGIN_SRC sh
+#+BEGIN_SRC shell
 if [ -f .envrc-git-init ]; then
   source_env_if_exists .envrc-git-init || source .envrc-git-init
 fi
@@ -49,15 +49,15 @@ fi
 
 - https://github.com/nix-community/nix-direnv
   - source_url
-    - direnv fetchurl "https://raw.githubusercontent.com/nix-community/nix-direnv/<<direnv-version>>/direnvrc" "<<direnv-sha>>"
+    - direnv fetchurl "https://raw.githubusercontent.com/nix-community/nix-direnv/<<direnv-version>>/direnvrc" "<<direnv_hash>>"
     - ${NixDirEnvVersion}
 
 #+HEADER: :tangle ../.envrc-nix
-#+BEGIN_SRC sh
+#+BEGIN_SRC shell
 NIX_ENFORCE_PURITY=1
 # - https://github.com/nix-community/nix-direnv
-NixDirEnvVersion="<<direnv-version>>"
-NixDirEnvSHA="<<direnv-sha>>"
+NixDirEnvVersion="<<direnv_version>>"
+NixDirEnvSHA="<<direnv_hash>>"
 if ! has nix_direnv_version || ! nix_direnv_version ${NixDirEnvVersion}; then
   source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/${NixDirEnvVersion}/direnvrc" "${NixDirEnvSHA}"
 fi
@@ -72,110 +72,74 @@ PATH_add result/bin
 use flake .
 #use flake .#default
 echo '
-- consider running:
+• consider running:
   ❯❯ nix flake show
   ❯❯ nix flake update && nix flake check && nix flake show
 
-- for a dev shell (development environment):
-
-  ❯❯ nix develop
-  ❯❯ nix develop ".#" --print-build-logs -c zsh
-  ❯❯ nix develop ".#dsh" --print-build-logs -c zsh
-  ❯❯ nix develop ".#dsh-epub" --print-build-logs -c zsh
-  ❯❯ nix develop ".#dsh-html" --print-build-logs -c zsh
-  ❯❯ nix develop ".#dsh-i18n" --print-build-logs -c zsh
-  ❯❯ nix develop ".#dsh-latex-pdf" --print-build-logs -c zsh
-  ❯❯ nix develop ".#dsh-overlay-ldc" --print-build-logs -c zsh
-  ❯❯ nix develop ".#dsh-spine" --print-build-logs -c zsh
-  ❯❯ nix develop ".#dsh-sqlite" --print-build-logs -c zsh
-
-- to build project:
-
-  ❯❯ nix build --print-build-logs
-  ❯❯ nix build ".#" --print-build-logs
-
-- to build project:
-  ❯❯ nix build ".#spine-overlay-dmd" --print-build-logs
-  ❯❯ nix build ".#spine-overlay-ldc" --print-build-logs
-
-- to build using dub (on nix or otherwise):
+• for a dev shell (development environment):
+  • nix develop
+    ❯❯ nix develop ".#" --print-build-logs -c zsh
+  • nix develop some specialized shells (tools)
+    ❯❯ nix develop ".#dsh-epub" --print-build-logs -c zsh
+    ❯❯ nix develop ".#dsh-html" --print-build-logs -c zsh
+    ❯❯ nix develop ".#dsh-i18n" --print-build-logs -c zsh
+    ❯❯ nix develop ".#dsh-latex-pdf" --print-build-logs -c zsh
+    ❯❯ nix develop ".#dsh-spine" --print-build-logs -c zsh
+    ❯❯ nix develop ".#dsh-sqlite" --print-build-logs -c zsh
+  • nix develop using nixpkgs
+    ❯❯ nix develop ".#dsh-nixpkgs-dmd" --print-build-logs -c zsh
+    ❯❯ nix develop ".#dsh-nixpkgs-ldc" --print-build-logs -c zsh
+  • nix develop using package overlays: (dmd-<<dmd_version>>, ldc-<<ldc_version>>, dub-<<dub_version>>, dtools-<<dtools_version>>)
+    ❯❯ nix develop ".#dsh-overlay-dmd" --print-build-logs -c zsh
+    ❯❯ nix develop ".#dsh-overlay-ldc" --print-build-logs -c zsh
+  • for more nix develop specialized shells
+    ❯❯ nix flake show
+
+• to build project:
+  • nix flake set default
+    ❯❯ nix build --print-build-logs
+    ❯❯ nix build ".#" --print-build-logs
+    ❯❯ nix build ".#spine-nixpkgs-dmd" --print-build-logs
+    ❯❯ nix build ".#spine-nixpkgs-ldc" --print-build-logs
+  • nix build using package overlays: (dmd, ldc, dub, dtools)
+    ❯❯ nix build ".#spine-overlay-dmd" --print-build-logs
+    ❯❯ nix build ".#spine-overlay-ldc" --print-build-logs
+
+• to build using dub (on nix or otherwise):
 
   you need to be in sisudoc-spine to use source code tree directly.
 
-- for develop environment & build options
+• for develop environment & build options
 
   ❯❯ nix flake update && nix flake check && nix flake show
   ❯❯ nix flake show
 
-- if on nix: build the sisudoc-spine using nix build commands above and
+• if on nix: build the sisudoc-spine using nix build commands above and
   run the result against the sample files here in the sisudoc-spine-samples dir
   (assuming the appropriate paths have been set in your .envrc-local)
 
   ❯❯ ${SpineBIN} -v --source --pod --epub --html --html-link-curate --html-link-markup --curate --output=${SpineOUT} ${SpinePOD}/*
   ❯❯ ${SpineBIN} -v --source --pod --latex --latex-init --epub --html --html-link-pdf --html-link-curate --html-link-markup --curate --output=${SpineOUT} ${SpinePOD}/*
+
+  ❯❯ ${SpineBIN} -v --sqlite-db-create --sqlite-db-filename=${SpineSQLdb} --sqlite-db-path=./_tmp-db
+  ❯❯ ${SpineBIN} -v --sqlite-update --sqlite-db-filename=${SpineSQLdb} --sqlite-db-path=./_tmp-db ./markup/pod/*
 '
-echo "-
+#+END_SRC
+
+#+BEGIN_SRC shell
+echo "•
   ❯❯ ${SpineBIN} -v --source --pod --epub --html --html-link-curate --html-link-markup --curate --output=${SpineOUT} ${SpinePOD}/*
   ❯❯ ${SpineBIN} -v --source --pod --latex --latex-init --epub --html --html-link-pdf --html-link-curate --html-link-markup --curate --output=${SpineOUT} ${SpinePOD}/*
+  ❯❯ spine --very-verbose --sqlite-db-create --sqlite-db-filename=spine.search.db --sqlite-db-path=./_tmp-db
+  ❯❯ spine -v --html --epub --latex --sqlite-update --sqlite-db-filename=spine.search.db --sqlite-db-path=./tmp-db ./markup/pod/*
 "
 #+END_SRC
 
-*** 3.0.4
-
-#+NAME: direnv-version
-#+BEGIN_SRC sh
-3.0.4
-#+END_SRC
-
-#+NAME: direnv-sha
-#+BEGIN_SRC sh
-sha256-DzlYZ33mWF/Gs8DDeyjr8mnVmQGx7ASYqA5WlxwvBG4=
-#+END_SRC
-
-*** 3.0.0
-
-#+BEGIN_SRC sh
-3.0.0
-#+END_SRC
-
-#+BEGIN_SRC sh
-sha256-21TMnI2xWX7HkSTjFFri2UaohXVj854mgvWapWrxRXg=
-#+END_SRC
-
-*** 2.4.0
-
-#+BEGIN_SRC sh
-2.4.0
-#+END_SRC
-
-#+BEGIN_SRC sh
-sha256-XQzUAvL6pysIJnRJyR7uVpmUSZfc7LSgWQwq/4mBr1U=
-#+END_SRC
-
-#+BEGIN_SRC sh
-2.3.0
-#+END_SRC
-
-#+BEGIN_SRC sh
-sha256-Dmd+j63L84wuzgyjITIfSxSD57Tx7v51DMxVZOsiUD8=
-#+END_SRC
-
-#+NAME: direnv-sha_
-#+BEGIN_SRC sh
-sha256-0000000000000000000000000000000000000000000=
-#+END_SRC
-
-#+BEGIN_SRC sh
-- https://github.com/nix-community/nix-direnv
-NixDirEnvSHA="sha256-0000000000000000000000000000000000000000000="
-direnv fetchurl https://raw.githubusercontent.com/nix-community/nix-direnv/${NixDirEnvVersion}/direnvrc
-#+END_SRC
-
 ** .envrc-git-init
 
 #+HEADER: :tangle ../.envrc-git-init
 #+HEADER: :noweb yes
-#+BEGIN_SRC sh
+#+BEGIN_SRC shell
 if [[ ! -d ./.git ]]; then
   git init
   git add .
@@ -188,16 +152,14 @@ fi
 
 #+HEADER: :tangle ../.envrc-local_
 #+HEADER: :noweb yes
-#+BEGIN_SRC sh
+#+BEGIN_SRC shell
 export SpineBIN=./result/bin/spine
 # ❯❯ nix builds spine binary:
 #export SpineBIN=./result/bin/spine
-# ❯❯ if from ../sisudoc-spine on directory tree nix build
-#export SpineBIN=../sisudoc-spine/result/bin/spine
-# ❯❯ dub builds spine binary (name depends on build, check):
-#export SpineBIN=../sisudoc-spine/bin/spine
-#export SpineBIN=../sisudoc-spine/bin/spine-ldc
-#export SpineBIN=../sisudoc-spine/bin/spine-dmd
+# ❯❯ dub builds spine binary (name depends on build, check, not available here):
+#export SpineBIN=./bin/spine
+#export SpineBIN=./bin/spine-ldc
+#export SpineBIN=./bin/spine-dmd
 # ❯❯ location of source files:
 export SpineDOC=.
 # ❯❯ location of source files pod:
@@ -219,3 +181,67 @@ export SpineCGIbin=/var/www/cgi/cgi-bin
 export SpineDBpath=/var/www/sqlite
 #export SpineDBpath=/srv/www/spine/sqlite
 #+END_SRC
+
+* versions GET
+** direnv
+
+#+NAME: direnv_version
+#+HEADER: :noweb yes
+#+BEGIN_SRC emacs-lisp
+<<./nix-develop-dlang-shared.org:direnv-version()>>
+#+END_SRC
+
+#+NAME: direnv_hash
+#+HEADER: :noweb yes
+#+BEGIN_SRC emacs-lisp
+<<./nix-develop-dlang-shared.org:direnv-hash()>>
+#+END_SRC
+
+** spine project VERSION :version:set:project:
+
+#+NAME: spine_version
+#+HEADER: :noweb yes
+#+BEGIN_SRC emacs-lisp
+<<./sisudoc_spine_version_info_and_doc_header_including_copyright_and_license.org:spine_project_version()>>
+#+END_SRC
+
+** dlang overlays
+
+- does not make sense to update versions here, unless you carry on careful
+  syncing with provided dlang related overlays ... which should not be
+  necessary, so they are available here but have been taken out of use;
+  the latest available overlay is pulled
+
+*** ldc
+
+#+NAME: ldc_version
+#+HEADER: :noweb yes
+#+BEGIN_SRC emacs-lisp
+<<./nix-develop-dlang-shared.org:ldc-version()>>
+#+END_SRC
+
+*** dmd
+
+#+NAME: dmd_version
+#+HEADER: :noweb yes
+#+BEGIN_SRC emacs-lisp
+<<./nix-develop-dlang-shared.org:dmd-version()>>
+#+END_SRC
+
+*** dub
+
+#+NAME: dub_version
+#+HEADER: :noweb yes
+#+BEGIN_SRC emacs-lisp
+<<./nix-develop-dlang-shared.org:dub-version()>>
+#+END_SRC
+
+*** dtools
+
+#+NAME: dtools_version
+#+HEADER: :noweb yes
+#+BEGIN_SRC emacs-lisp
+<<./nix-develop-dlang-shared.org:dtools-version()>>
+#+END_SRC
+
+* __END__
diff --git a/org/config_git.org b/org/config_git.org
index 9622e4e..4420641 100644
--- a/org/config_git.org
+++ b/org/config_git.org
@@ -4,7 +4,7 @@
 #+FILETAGS:    :spine:hub:
 #+AUTHOR:      Ralph Amissah
 #+EMAIL:       [[mailto:ralph.amissah@gmail.com][ralph.amissah@gmail.com]]
-#+COPYRIGHT:   Copyright (C) 2015 - 2024 Ralph Amissah
+#+COPYRIGHT:   Copyright (C) 2015 - 2025 Ralph Amissah
 #+LANGUAGE:    en
 #+STARTUP:     content hideblocks hidestars noindent entitiespretty
 #+PROPERTY:    header-args  :exports code
@@ -19,7 +19,7 @@
 ** .gitignore :gitignore:
 
 #+HEADER: :tangle "../.gitignore"
-#+BEGIN_SRC sh
+#+BEGIN_SRC gitignore
 # git ls-files --others --exclude-from=.git/info/exclude
 # git check-ignore -v flake.lock
 # git clean -ix
@@ -36,10 +36,8 @@
 !.envrc-local
 !.envrc-nix
 !.envrc-git-init
-!.env
-!.env/**
-!README
 !README.md
+!README
 !COPYRIGHT
 !CHANGELOG
 !makefile
@@ -47,6 +45,8 @@
 !configuration.txt
 !*.json
 !*.sdl
+!*.md
+!*.txt
 !tangle
 !*.org
 !org
@@ -96,119 +96,28 @@
 ,**/.dub/**
 tmp/**
 ,*_.org
+,*_.md
+,*_.txt
+,*_.json
 ,*_.nix
 ,*_.d
 ,*_.txt
 ,*_
-!.envrc-local_
 ,*.swp
 ,*~
 \#*
 ,*.\#*
+!.envrc-local_
 #!*/
 #\#*
 #*.\#*
 #.reggae/**
 #+END_SRC
 
-** markup/.gitignore (redundant) :gitignore:
-
-#+HEADER: :tangle "../markup/.gitignore"
-#+BEGIN_SRC sh
-# git ls-files --others --exclude-from=.git/info/exclude
-# git check-ignore -v flake.lock
-# git clean -ix
-# find . -name "*_" | xargs rm -rf
-# find . -name "*.o" | xargs rm -rf
-,*
-!.gitignore
-!COPYRIGHT
-!README
-!README.md
-!shell.nix
-!packages.nix
-!version.txt
-!pod/
-!pod/.dr/config_local_site
-# pod.manifest
-!pod/*/
-!pod/*/pod.manifest
-# conf/document_make
-!pod/*/conf/
-!pod/*/conf/document_make
-# media/text
-!pod/*/media/
-!pod/*/media/text/
-!pod/*/media/text/*/
-!pod/*/media/text/*/*.sst
-!pod/*/media/text/*/*.ssm
-!pod/*/media/text/*/*.ssi
-!pod/*/media/text/*/index.html.in
-# media/image
-!pod/*/media/image/
-!pod/*/media/image/*.png
-!pod/*/media/image/*.jpg
-!pod/*/media/image/*.PNG
-!pod/*/media/image/*.JPG
-# tools/po4a
-!pod/*/tools/
-!pod/*/tools/Makefile
-!pod/*/tools/bin/
-!pod/*/tools/bin/*.sh
-!pod/*/tools/po4a/
-!pod/*/tools/po4a/pot/
-!pod/*/tools/po4a/pot/*.sst.pot
-!pod/*/tools/po4a/pot/*.ssm.pot
-!pod/*/tools/po4a/pot/*.ssi.pot
-!pod/*/tools/po4a/pot/index.html.in.pot
-!pod/*/tools/po4a/po/
-!pod/*/tools/po4a/po/*/
-!pod/*/tools/po4a/po/*/*.sst.po
-!pod/*/tools/po4a/po/*/*.ssm.po
-!pod/*/tools/po4a/po/*/*.ssi.po
-!pod/*/tools/po4a/po/*/index.html.in.po
-!pod/.dr
-!pod/.dr/*
-# separate from media/text use tools
-!pod/*/media/text/Makefile
-!pod/*/media/text/bin/
-!pod/*/media/text/bin/*.sh
-!pod/*/media/text/pot/
-!pod/*/media/text/pot/*.sst.pot
-!pod/*/media/text/pot/*.ssm.pot
-!pod/*/media/text/pot/*.ssi.pot
-!pod/*/media/text/pot/index.html.in.pot
-!pod/*/media/text/po/
-!pod/*/media/text/po/*/
-!pod/*/media/text/po/*/*.sst.po
-!pod/*/media/text/po/*/*.ssm.po
-!pod/*/media/text/po/*/*.ssi.po
-!pod/*/media/text/po/*/index.html.in.po
-!non-pod-samples/
-!non-pod-samples/*.sst
-!non-pod-samples/image/
-!non-pod-samples/image/*.png
-!non-pod-samples/image/*.jpg
-!non-pod-samples/image/*.PNG
-!non-pod-samples/image/*.JPG
-!sisudoc-spine-bespoke-output/
-!sisudoc-spine-bespoke-output/**
-# skip
-.dub/**
-tmp/**
-,*_.org
-,*_.d
-,*_.txt
-,*_
-,*~
-\#*
-,*.\#*
-#+END_SRC
-
 ** .gitattributes :gitattributes:
 
 #+HEADER: :tangle "../.gitattributes"
-#+BEGIN_SRC sh
+#+BEGIN_SRC gitattributes
 /org export-ignore
 .gitattributes export-ignore
 /.dub export-ignore
diff --git a/org/config_nix.org b/org/config_nix.org
index 52e16e6..a6d4360 100644
--- a/org/config_nix.org
+++ b/org/config_nix.org
@@ -4,7 +4,7 @@
 #+FILETAGS:    :spine:build:tools:
 #+AUTHOR:      Ralph Amissah
 #+EMAIL:       [[mailto:ralph.amissah@gmail.com][ralph.amissah@gmail.com]]
-#+COPYRIGHT:   Copyright (C) 2015 - 2024 Ralph Amissah
+#+COPYRIGHT:   Copyright (C) 2015 - 2025 Ralph Amissah
 #+LANGUAGE:    en
 #+STARTUP:     show4levels hideblocks hidestars noindent entitiespretty
 #+PROPERTY:    header-args  :exports code
@@ -26,7 +26,6 @@
 {
   description = "spine (sisu like parser & document generator) made available to process markup samples";
   inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
-  inputs.flake-utils.url = "github:numtide/flake-utils";
   inputs.spine = {
     url = "<<sisudoc_spine_nix_src>>";
     inputs.nixpkgs.follows = "nixpkgs";
@@ -40,9 +39,9 @@
   outputs = {
     self,
     nixpkgs,
-    flake-utils,
     spine,
     d-overlay,
+    ...
   } @ inputs: let
     version = "<<spine_version>>";
     shell = ./shell.nix;
@@ -55,9 +54,9 @@
       pkgs = nixpkgsFor.${system};
     in {
       default = spine.packages.${system}.default;
-      #spine-nixpkgs-dmd = spine.packages.${system}.spine-nixpkgs-dmd;
+      spine-nixpkgs-dmd = spine.packages.${system}.spine-nixpkgs-dmd;
       spine-overlay-dmd = spine.packages.${system}.spine-overlay-dmd;
-      #spine-nixpkgs-ldc = spine.packages.${system}.spine-nixpkgs-ldc;
+      spine-nixpkgs-ldc = spine.packages.${system}.spine-nixpkgs-ldc;
       spine-overlay-ldc = spine.packages.${system}.spine-overlay-ldc;
       #vendorSha256 = "sha256-0Q00000000000000000000000000000000000000000=";
     });
@@ -70,9 +69,9 @@
     devShells = forAllSystems (system: let
       pkgs = nixpkgsFor.${system};
       shellHook = ''
+        export DFLAGS="-O2 -boundscheck=on"
         export Date=`date "+%Y%m%d"`
         ## set local values in .envrc-local (or here if you must)
-        echo "  ❯❯ ./result/bin/spine -v --source --pod --epub --html --html-link-pdf --html-link-curate --html-link-markup --curate --output=./OUTPUT_TEST_sisudocSpine ./markup/pod/*";
       '';
     in
       with pkgs; {
@@ -95,7 +94,7 @@
         dsh-overlay-ldc = d-overlay.devShells.${system}.dsh-overlay-ldc-dub;
         dsh-nixpkgs-ldc = d-overlay.devShells.${system}.dsh-nixpkgs-ldc-dub;
         dsh-epub = mkShell {
-          name = "spine dev shell for epub output";
+          name = "spine-<<spine_version>> dev shell for epub output";
           inherit shell;
           inherit devEnv;
           packages = [
@@ -123,7 +122,7 @@
           inherit shellHook;
         };
         dsh-html = mkShell {
-          name = "spine dev shell for latex & pdf output";
+          name = "spine-<<spine_version>> dev shell for html output";
           inherit shell;
           inherit devEnv;
           packages = [
@@ -143,7 +142,7 @@
           inherit shellHook;
         };
         dsh-latex-pdf = mkShell {
-          name = "spine dev shell for latex & pdf output";
+          name = "spine-<<spine_version>> dev shell for latex & pdf output";
           inherit shell;
           inherit devEnv;
           packages = [
@@ -159,7 +158,7 @@
           inherit shellHook;
         };
         dsh-sqlite = mkShell {
-          name = "spine dev shell for latex & pdf output";
+          name = "spine-<<spine_version>> dev shell for sqlite3 output";
           inherit shell;
           inherit devEnv;
           packages = [
@@ -172,7 +171,7 @@
           inherit shellHook;
         };
         dsh-i18n = mkShell {
-          name = "spine dev shell internationalization, po4a";
+          name = "spine-<<spine_version>> dev shell for internationalization, po4a";
           inherit shell;
           inherit devEnv;
           packages = [
@@ -205,13 +204,13 @@ with pkgs;
       # ❯❯❯ nix_related
       ##nix
       #direnv
-      #nixVersions.nix_2_21 #nixVersions.latest #nixVersions.git
+      #nixVersions.latest #nixVersions.latest #nixVersions.git
       #nix-prefetch-git
       #validatePkgConfig
       nix-output-monitor
       #nix-tree
       #jq
-      #alejandra
+      #nixfmt-rfc-style
       #git
       # ❯❯❯ dev
       #gnumake
@@ -220,14 +219,17 @@ with pkgs;
       # ❯❯ package manager
       #dub
       # ❯❯ compiler
+      #dmd
       #ldc
-      ##rund
+      #rund
       # ❯❯ linker
-      ##lld
-      ##mold
+      #lld
+      #mold
       # ❯❯ builder
-      ##ninja
-      ##meson
+      #ninja
+      #meson
+      # ❯❯ tools
+      #dtools
       # ❯❯❯ sqlite search related
       #sqlite
       # ❯❯❯ pdf_latex_related
@@ -265,6 +267,7 @@ pkgs.callPackage ./devenv.nix {}
 #+END_SRC
 
 * devEnv
+** devenv.nix :default:devenv:
 
 nix profile install .
 
@@ -283,13 +286,13 @@ with pkgs;
       # ❯❯❯ nix_related
       #nix # if not on NixOS, this is needed
       direnv
-      nixVersions.nix_2_21 #nixVersions.latest #nixVersions.git
+      nixVersions.latest #nixVersions.latest #nixVersions.git #nixVersions.nix_2_29 #nixVersions.nix_2_29
       nix-prefetch-git
       validatePkgConfig
       nix-output-monitor
       nix-tree
-      jq
-      #alejandra
+      jq #gx
+      #nixfmt-rfc-style
       git
       # ❯❯❯ dev
       gnumake
@@ -386,7 +389,7 @@ with (
                 exit "Error: could not find D compiler"
               fi
               echo "$DC_ used as D compiler to build $pname"
-              dub run --compiler=$DC --build=release --combined --skip-registry=all
+              dub build --compiler=$DC --build=release --combined --skip-registry=all
               runHook postBuild
             '';
             checkPhase = ''
@@ -426,7 +429,7 @@ with (
       sha256 = "<<spine_tarball_sha256>>";
     };
     nativeBuildInputs = with pkgs; [dub ldc];
-    buildInputs = with pkgs; [nixVersions.nix_2_21 sqlite];
+    buildInputs = with pkgs; [nixVersions.latest sqlite];
     meta = with pkgs.lib; {
       description = "A sisu like parser & document generator";
       longDescription = ''
@@ -440,8 +443,6 @@ with (
   }
 #+END_SRC
 
-#src = ./.;
-
 #+NAME: project_path_local_out_static
 #+HEADER: :noweb yes
 #+BEGIN_SRC nix
@@ -467,7 +468,7 @@ file://<<spine_tarball_path>>/<<spine_tarball_filename>>
 #+END_SRC
 
 #+NAME: nixpkgs_local
-#+BEGIN_SRC sh
+#+BEGIN_SRC shell
 /srv/nixpkgs-dev/nixpkgs
 #+END_SRC
 
@@ -489,12 +490,6 @@ spine-0.12.0-tag-0.11.2.r107.gf89a107.tar.gz
 sha256:03dr7dn7kq6arw4ry7qar13iqmi1caw70imfjwi8qr7g2j4mnk2q
 #+END_SRC
 
-#+BEGIN_SRC nix
-sha256:0000000000000000000000000000000000000000000000000000
-#+END_SRC
-
-/home/ralph/grotto/repo/git.repo/projects/project-spine/tarball
-
 #+NAME: project_path_local_out_static_
 #+BEGIN_SRC nix
 /var/www
@@ -518,16 +513,13 @@ github:NixOS/nixpkgs/nixpkgs-unstable
 "nixpkgs/nixos-unstable";
 #+END_SRC
 
-#+BEGIN_SRC nix
-"nixpkgs/nixos-23.05";
-#+END_SRC
-
 #+HEADER: :noweb yes
 #+BEGIN_SRC nix
 <<nixpkgs_path_local>>
 #+END_SRC
 
-** version info SET VERSION :version:set:project:
+* SHARED
+** version and other things shared
 *** spine project VERSION :version:set:project:
 
 #+NAME: spine_version
@@ -536,7 +528,8 @@ github:NixOS/nixpkgs/nixpkgs-unstable
 <<./sisudoc_spine_version_info_and_doc_header_including_copyright_and_license.org:spine_project_version()>>
 #+END_SRC
 
-*** spine project git sources VERSION :version:set:project:
+*** spine project git sources
+**** spine project git sources url
 
 #+NAME: sisudoc_spine_nix_src
 #+HEADER: :noweb yes
@@ -544,6 +537,9 @@ github:NixOS/nixpkgs/nixpkgs-unstable
 <<./sisudoc_spine_version_info_and_doc_header_including_copyright_and_license.org:sisudoc_spine_nix_src()>>
 #+END_SRC
 
+*** spine project git sources url
+**** spine project git sources overlay url
+
 #+NAME: sisudoc_dlang_nix_overlay_src
 #+HEADER: :noweb yes
 #+BEGIN_SRC emacs-lisp
diff --git a/org/nix-develop-dlang-shared.org b/org/nix-develop-dlang-shared.org
new file mode 100644
index 0000000..2a2f66d
--- /dev/null
+++ b/org/nix-develop-dlang-shared.org
@@ -0,0 +1,713 @@
+-*- mode: org -*-
+#+TITLE:       dlang related shared versions
+#+DESCRIPTION: dlang
+#+FILETAGS:    :dlang:develop:shared:
+#+AUTHOR:      Ralph Amissah
+#+EMAIL:       [[mailto:ralph.amissah@gmail.com][ralph.amissah@gmail.com]]
+#+COPYRIGHT:   Copyright (C) 2015 - 2025 Ralph Amissah
+#+LANGUAGE:    en
+#+STARTUP:     content hideblocks hidestars noindent entitiespretty
+#+PROPERTY:    header-args  :noweb yes
+#+PROPERTY:    header-args+ :exports code
+#+PROPERTY:    header-args+ :results no
+#+PROPERTY:    header-args+ :cache no
+#+PROPERTY:    header-args+ :padline no
+#+PROPERTY:    header-args+ :mkdirp yes
+#+OPTIONS:     H:3 num:nil toc:t \n:t ::t |:t ^:nil -:t f:t *:t
+
+* nix
+** direnv
+*** NOTES to update direnv in .envrc-nix
+
+- https://github.com/nix-community/nix-direnv
+
+check for latest version:
+
+- https://github.com/nix-community/nix-direnv/releases
+
+update direnv version and sha hash:
+- emacs org/nix-develop-dlang-shared.org
+
+re-tangle file:
+
+- emacs org/config_env.org
+  updates: .envrc-nix
+
+update flake.lock:
+- nix flake update && nix flake check && nix flake show
+
+*** version SET
+
+#+NAME: direnv-version
+#+BEGIN_SRC org
+<<direnv_version_3_0_7>>
+#+END_SRC
+
+#+NAME: direnv-hash
+#+BEGIN_SRC org
+<<direnv_hash_3_0_7>>
+#+END_SRC
+
+*** versions
+
+**** 3.0.7
+
+#+NAME: direnv_version_3_0_7
+#+BEGIN_SRC org
+3.0.7
+#+END_SRC
+
+#+NAME: direnv_hash_3_0_7
+#+BEGIN_SRC org
+sha256-bn8WANE5a91RusFmRI7kS751ApelG02nMcwRekC/qzc=
+#+END_SRC
+
+**** 3.0.6
+
+#+NAME: direnv_version_3_0_6
+#+BEGIN_SRC org
+3.0.6
+#+END_SRC
+
+#+NAME: direnv_hash_3_0_6
+#+BEGIN_SRC org
+sha256-RYcUJaRMf8oF5LznDrlCXbkOQrywm0HDv1VjYGaJGdM=
+#+END_SRC
+
+**** 3.0.4
+
+#+NAME: direnv_version_3_0_4
+#+BEGIN_SRC org
+3.0.4
+#+END_SRC
+
+#+NAME: direnv_hash_3_0_4
+#+BEGIN_SRC org
+sha256-DzlYZ33mWF/Gs8DDeyjr8mnVmQGx7ASYqA5WlxwvBG4=
+#+END_SRC
+
+**** 3.0.0
+
+#+NAME: direnv_version_3_0_0
+#+BEGIN_SRC org
+3.0.0
+#+END_SRC
+
+#+NAME: direnv_hash_3_0_0
+#+BEGIN_SRC org
+sha256-21TMnI2xWX7HkSTjFFri2UaohXVj854mgvWapWrxRXg=
+#+END_SRC
+
+**** 2.4.0
+
+#+NAME: direnv_version_2_4_0
+#+BEGIN_SRC org
+2.4.0
+#+END_SRC
+
+#+NAME: direnv_hash_2_4_0
+#+BEGIN_SRC org
+sha256-XQzUAvL6pysIJnRJyR7uVpmUSZfc7LSgWQwq/4mBr1U=
+#+END_SRC
+
+* dlang
+** ldc
+*** NOTES to update ldc
+
+check for latest version:
+
+update ldc version and sha hash:
+- emacs ./org/nix-develop-dlang-shared.org
+
+re-tangle files:
+- emacs ./org/nixpkgs_overlays_d_related.org
+  updates: nix-overlays/ldc/package.nix
+- emacs ./org/config_nix.org
+  updates: flake.nix
+- emacs ./org/config_env.org
+  updates: .envrc-nix
+
+update flake.lock:
+- nix flake update && nix flake check && nix flake show
+
+build:
+- nix build ".#spine-overlay-ldc" --print-build-logs
+
+adjust nix overlay if required (to get started):
+- git clone --depth 1 https://github.com/NixOS/nixpkgs
+- find ./nixpkgs/pkgs/ -type d -name "ldc"
+  ./nixpkgs/pkgs/by-name/ld/ldc
+- compare with overlay:
+  ./nix-overlays/ldc
+- overlay is tangled from:
+  emacs ./org/nixpkgs_overlays_d_related.org
+
+*** version SET
+**** version & sha256 nix composite
+
+#+NAME: ldc-version-info
+#+BEGIN_SRC org
+version = "<<ldc-version>>";
+sha256 = "<<ldc-hash>>";
+#+END_SRC
+
+**** select version SET OK ✓
+
+#+NAME: ldc-version
+#+BEGIN_SRC org
+<<ldc_version_1_41_0>>
+#+END_SRC
+
+#+NAME: ldc-hash
+#+BEGIN_SRC org
+<<ldc_hash_1_41_0>>
+#+END_SRC
+
+#+NAME: ldc-llvm-set
+#+BEGIN_SRC org
+<<ldc_llvm_set_1_41_0>>
+#+END_SRC
+
+*** versions
+**** 1.41 OK ✓
+***** 1.41.0 OK ✓
+
+ - nix-prefetch-url --unpack https://github.com/ldc-developers/ldc/archive/refs/tags/v1.41.0.tar.gz
+ - nix-prefetch-url --unpack https://github.com/ldc-developers/ldc/releases/download/v${version}/ldc-${version}-src.tar.gz
+
+#+NAME: ldc_version_1_41_0
+#+BEGIN_SRC nix
+1.41.0
+#+END_SRC
+
+#+NAME: ldc_hash_1_41_0
+#+BEGIN_SRC nix
+sha256-6LcpY3LSFK4KgEiGrFp/LONu5Vr+/+vI04wEEpF3s+s=
+#+END_SRC
+
+#+NAME: ldc_llvm_set_1_41_0
+#+BEGIN_SRC nix
+llvm_20
+#+END_SRC
+
+**** 1.40 OK ✓
+***** 1.40.1 OK ✓
+
+ - nix-prefetch-url --unpack https://github.com/ldc-developers/ldc/archive/refs/tags/v1.40.1.tar.gz
+ - nix-prefetch-url --unpack https://github.com/ldc-developers/ldc/releases/download/v${version}/ldc-${version}-src.tar.gz
+
+#+NAME: ldc_version_1_40_1
+#+BEGIN_SRC nix
+1.40.1
+#+END_SRC
+
+#+NAME: ldc_hash_1_40_1
+#+BEGIN_SRC nix
+sha256-WdnwdH25A5oMNNY3uWG2hxnaAT+S1hNuP7LElH3uuuk=
+#+END_SRC
+
+#+NAME: ldc_llvm_set_1_40_1
+#+BEGIN_SRC nix
+llvm_19
+#+END_SRC
+
+***** 1.40.0 OK ✓
+
+ - nix-prefetch-url --unpack https://github.com/ldc-developers/ldc/archive/refs/tags/v1.40.0.tar.gz
+ - nix-prefetch-url --unpack https://github.com/ldc-developers/ldc/releases/download/v${version}/ldc-${version}-src.tar.gz
+
+#+NAME: ldc_version_1_40_0
+#+BEGIN_SRC nix
+1.40.0
+#+END_SRC
+
+#+NAME: ldc_hash_1_40_0
+#+BEGIN_SRC nix
+sha256-LT85DlAebecPpBUgZP0ayKTVrTUqN6DMJVEWTatLOxY=
+#+END_SRC
+
+#+NAME: ldc_llvm_set_1_40_0
+#+BEGIN_SRC nix
+llvm_19
+#+END_SRC
+
+**** 1.39 OK ✓
+***** 1.39.0 OK ✓
+
+- nix-prefetch-url --unpack https://github.com/ldc-developers/ldc/archive/refs/tags/v1.39.0.tar.gz
+- nix-prefetch-url --unpack https://github.com/ldc-developers/ldc/releases/download/v${version}/ldc-${version}-src.tar.gz
+
+#+NAME: ldc_version_1_39_0
+#+BEGIN_SRC nix
+1.39.0
+#+END_SRC
+
+#+NAME: ldc_hash_1_39_0
+#+BEGIN_SRC nix
+sha256-ZiG0ATsY6Asu2nus3Y404fvqIwtKYoHl1JRUDU5A6mo=
+#+END_SRC
+
+#+NAME: ldc_llvm_set_1_39_0
+#+BEGIN_SRC nix
+llvm_18
+#+END_SRC
+
+**** =< 1.32
+***** 1.32.2
+
+- nix-prefetch-url --unpack https://github.com/ldc-developers/ldc/archive/refs/tags/v1.32.1.tar.gz
+
+#+NAME: ldc_version_1_32_2
+#+BEGIN_SRC nix
+1.32.2
+#+END_SRC
+
+#+NAME: ldc_hash_1_32_2
+#+BEGIN_SRC nix
+sha256-v6Sq7nQyChJohDyI4inzObLfCVOkvLT87VLr4N2hzZU=
+#+END_SRC
+
+***** 1.32.1
+
+- nix-prefetch-url --unpack https://github.com/ldc-developers/ldc/archive/refs/tags/v1.32.1.tar.gz
+
+#+NAME: ldc_version_1_32_1
+#+BEGIN_SRC nix
+1.32.1
+#+END_SRC
+
+#+NAME: ldc_hash_1_32_1
+#+BEGIN_SRC nix
+sha256-s1U7+qiVJDF+zSHrLGPG6g+acIChYnXkb9p+OrNX6g8=
+#+END_SRC
+
+***** 1.32.0
+
+- nix-prefetch-url --unpack https://github.com/ldc-developers/ldc/archive/refs/tags/v1.32.0.tar.gz
+
+#+NAME: ldc_version_1_32_0
+#+BEGIN_SRC nix
+1.32.0
+#+END_SRC
+
+#+NAME: ldc_hash_1_32_0
+#+BEGIN_SRC nix
+sha256-xO4L+RtBbdVkE1PZsme2pIYAxJnHgr6xEtLkYOMpvqw=
+#+END_SRC
+
+***** 1.31.0
+
+- nix-prefetch-url --unpack https://github.com/ldc-developers/ldc/archive/refs/tags/v1.31.0.tar.gz
+
+#+NAME: ldc_version_1_31_0
+#+BEGIN_SRC nix
+1.31.0
+#+END_SRC
+
+#+NAME: ldc_hash_1_31_0
+#+BEGIN_SRC nix
+sha256-8cjs6eHjWAbDRBvyT75mbN3Y7vN1WSwZzY/uRwHNVFg=
+#+END_SRC
+
+***** 1.30.0
+
+- nix-prefetch-url --unpack https://github.com/ldc-developers/ldc/archive/refs/tags/v1.30.0.tar.gz
+
+#+NAME: ldc_version_1_30_0
+#+BEGIN_SRC nix
+1.30.0
+#+END_SRC
+
+#+NAME: ldc_hash_1_30_0
+#+BEGIN_SRC nix
+sha256-/bs3bwgkLZF5IqaiKnc5gCF/r6MQBG/F1kWUkK8j2s0=
+#+END_SRC
+
+** dmd
+
+- https://github.com/dlang/dmd/tags
+
+*** version SET
+
+#+NAME: dmd-version
+#+BEGIN_SRC org
+<<dmd_version_2_111_0>>
+#+END_SRC
+
+#+NAME: dmd-hash
+#+BEGIN_SRC org
+<<dmd_hash_2_111_0>>
+#+END_SRC
+
+#+NAME: phobos-hash
+#+BEGIN_SRC org
+<<phobos_hash_2_111_0>>
+#+END_SRC
+
+*** versions
+**** 2.111.0 OK ✓
+
+- nix-prefetch-url --unpack https://github.com/dlang/dmd/archive/refs/tags/v2.111.0.tar.gz
+- nix-prefetch-url --unpack https://github.com/dlang/phobos/archive/refs/tags/v2.111.0.tar.gz
+
+#+NAME: dmd_version_2_111_0
+#+BEGIN_SRC nix
+2.111.0
+#+END_SRC
+
+#+NAME: phobos_hash_2_111_0
+#+BEGIN_SRC nix
+sha256-9jySZbODoL8sULhYKj/l4+c/uiG5xY2dO240k9XQtPk=
+#+END_SRC
+
+#+NAME: dmd_hash_2_111_0
+#+BEGIN_SRC nix
+sha256-2bjsGa9nTny818dLRV6LKkes+Ycq8W+PFjwhGVrD5TM=
+#+END_SRC
+
+**** 2.110.0 OK ✓
+
+- nix-prefetch-url --unpack https://github.com/dlang/dmd/archive/refs/tags/v2.110.0.tar.gz
+- nix-prefetch-url --unpack https://github.com/dlang/phobos/archive/refs/tags/v2.110.0.tar.gz
+
+#+NAME: dmd_version_2_110_0
+#+BEGIN_SRC nix
+2.110.0
+#+END_SRC
+
+#+NAME: phobos_hash_2_110_0
+#+BEGIN_SRC nix
+sha256-CmJpcHM+sIsaYBlpALCFoQFG+93s8gUyWmM0tYqjXkk=
+#+END_SRC
+
+#+NAME: dmd_hash_2_110_0
+#+BEGIN_SRC nix
+sha256-icXp9xWF2AI2gp7z/lQFAChmXfQePe9b5pbpQ9Mn19Y=
+#+END_SRC
+
+**** 2.109.1 OK ✓
+
+- nix-prefetch-url --unpack https://github.com/dlang/dmd/archive/refs/tags/v2.109.1.tar.gz
+- nix-prefetch-url --unpack https://github.com/dlang/phobos/archive/refs/tags/v2.109.1.tar.gz
+
+#+NAME: dmd_version_2_109_1
+#+BEGIN_SRC nix
+2.109.1
+#+END_SRC
+
+#+NAME: phobos_hash_2_109_1
+#+BEGIN_SRC nix
+sha256-73I0k7tCBwe5tl4K6uMs3/nT2JTZ2SppFYzmokS4W5Y=
+#+END_SRC
+
+#+NAME: dmd_hash_2_109_1
+#+BEGIN_SRC nix
+sha256-3nCDPZnb4eQZmhYYxcH6qOmsP8or0KYuzAa5g/C9xdU=
+#+END_SRC
+
+**** 2.109.0 OK ✓
+
+- nix-prefetch-url --unpack https://github.com/dlang/dmd/archive/refs/tags/v2.109.0.tar.gz
+- nix-prefetch-url --unpack https://github.com/dlang/phobos/archive/refs/tags/v2.109.0.tar.gz
+
+#+NAME: dmd_version_2_109_0
+#+BEGIN_SRC nix
+2.109.0
+#+END_SRC
+
+#+NAME: dmd_hash_2_109_0
+#+BEGIN_SRC nix
+sha256-unAZgyZyT6qomlj6pdlOx4h1SKuDjutl1/0FM9AhBWc=
+#+END_SRC
+
+#+NAME: phobos_hash_2_109_0
+#+BEGIN_SRC nix
+sha256-b91FeluFqhmjHd1wwkyq98QzIlwjE646xNj2n6hP3aM=
+#+END_SRC
+
+**** 2.108.0 OK ✓
+
+- nix-prefetch-url --unpack https://github.com/dlang/dmd/archive/refs/tags/v2.108.0.tar.gz
+- nix-prefetch-url --unpack https://github.com/dlang/phobos/archive/refs/tags/v2.108.0.tar.gz
+
+#+NAME: dmd_version_2_108_0
+#+BEGIN_SRC nix
+2.108.0
+#+END_SRC
+
+#+NAME: dmd_hash_2_108_0
+#+BEGIN_SRC nix
+sha256-tlWcFgKtXzfqMMkOq4ezhZHdYCXFckjN5+m6jO4VH0U=
+#+END_SRC
+
+#+NAME: phobos_hash_2_108_0
+#+BEGIN_SRC nix
+sha256-uU8S4rABOfhpKh+MvSbclkbdf0hrsuKF8SIpWMnPpfU=
+#+END_SRC
+
+**** 2.107.0 OK ✓
+
+- nix-prefetch-url --unpack https://github.com/dlang/dmd/archive/refs/tags/v2.107.0.tar.gz
+- nix-prefetch-url --unpack https://github.com/dlang/phobos/archive/refs/tags/v2.107.0.tar.gz
+
+#+NAME: dmd_version_2_107_0
+#+BEGIN_SRC nix
+2.107.0
+#+END_SRC
+
+#+NAME: dmd_hash_2_107_0
+#+BEGIN_SRC nix
+<<sha256-blank>>
+#+END_SRC
+
+#+NAME: phobos_hash_2_107_0
+#+BEGIN_SRC nix
+<<sha256-blank>>
+#+END_SRC
+
+**** 2.106.1 OK ✓
+
+- nix-prefetch-url --unpack https://github.com/dlang/dmd/archive/refs/tags/v2.106.1.tar.gz
+- nix-prefetch-url --unpack https://github.com/dlang/phobos/archive/refs/tags/v2.106.1.tar.gz
+
+#+NAME: dmd_version_2_106_1
+#+BEGIN_SRC nix
+2.106.1
+#+END_SRC
+
+#+NAME: dmd_hash_2_106_1
+#+BEGIN_SRC nix
+sha256-vjYa/Pxrz7J2htXT+fa+xaeen/Vxne++lELbHTSXBK8=
+#+END_SRC
+
+#+NAME: phobos_hash_2_106_1
+#+BEGIN_SRC nix
+sha256-yRL9ub3u4mREG9PVxBvgQ/LDXD57RadPTZ2h08qyh/s=
+#+END_SRC
+
+#+NAME: dmd_version
+#+BEGIN_SRC nix
+<<dmd_version_2_104_0>>
+#+END_SRC
+
+#+NAME: dmd_hash
+#+BEGIN_SRC nix
+<<dmd_hash_2_104_0>>
+#+END_SRC
+
+#+NAME: phobos_hash
+#+BEGIN_SRC nix
+<<phobos_hash_2_104_0>>
+#+END_SRC
+
+** dub
+*** version SET
+
+#+NAME: dub-version
+#+HEADER: :noweb yes
+#+BEGIN_SRC org
+<<dub_version_1_39_0>>
+#+END_SRC
+
+#+NAME: dub-hash
+#+BEGIN_SRC org
+<<dub_hash_1_39_0>>
+#+END_SRC
+
+*** versions
+**** 1.39 OK ✓
+***** 1.39.0
+
+- nix-prefetch-url --unpack https://github.com/dlang/dub/archive/refs/tags/v1.39.0.tar.gz
+
+#+NAME: dub_version_1_39_0
+#+BEGIN_SRC nix
+1.39.0
+#+END_SRC
+
+#+NAME: dub_hash_1_39_0
+#+BEGIN_SRC nix
+sha256-73b15A9+hClD6IbuxTy9QZKpTKjUFYBuqGOclUyhrnM=
+#+END_SRC
+
+**** 1.38 OK ✓
+***** 1.38.1
+
+- nix-prefetch-url --unpack https://github.com/dlang/dub/archive/refs/tags/v1.38.1.tar.gz
+
+#+NAME: dub_version_1_38_1
+#+BEGIN_SRC nix
+1.38.1
+#+END_SRC
+
+#+NAME: dub_hash_1_38_1
+#+BEGIN_SRC nix
+sha256-8Lr/0sx4SKwU1aNOxZArta0RXpDM+EWl29ZsPDdPWFo=
+#+END_SRC
+
+**** 1.36 OK ✓
+***** 1.36.0
+
+- nix-prefetch-url --unpack https://github.com/dlang/dub/archive/refs/tags/v1.36.0.tar.gz
+
+#+NAME: dub_version_1_36_0
+#+BEGIN_SRC nix
+1.36.0
+#+END_SRC
+
+#+NAME: dub_hash_1_36_0
+#+BEGIN_SRC nix
+sha256-S8pls9zxbGAQTwqYf4bDT2q7Ow12S8bBsJE5UmsACBs=
+#+END_SRC
+
+**** 1.35 OK ✓
+***** 1.35.0
+
+- nix-prefetch-url --unpack https://github.com/dlang/dub/archive/refs/tags/v1.35.0.tar.gz
+
+#+NAME: dub_version_1_35_0
+#+BEGIN_SRC nix
+1.35.0
+#+END_SRC
+
+#+NAME: dub_hash_1_35_0
+#+BEGIN_SRC nix
+sha256-hC46XKE6lLLMLGMGl4vDnLDBQy6P/Z7o3ayDJj0Sois=
+#+END_SRC
+
+**** 1.34 OK ✓
+***** 1.34.0
+
+- nix-prefetch-url --unpack https://github.com/dlang/dub/archive/refs/tags/v1.34.0.tar.gz
+
+#+NAME: dub_version_1_34_0
+#+BEGIN_SRC nix
+1.34.0
+#+END_SRC
+
+#+NAME: dub_hash_1_34_0
+#+BEGIN_SRC nix
+sha256-hC46XKE6lLLMLGMGl4vDnLDBQy6P/Z7o3ayDJj0Sois=
+#+END_SRC
+
+**** 1.33 OK ✓
+***** 1.33.1
+
+- nix-prefetch-url --unpack https://github.com/dlang/dub/archive/refs/tags/v1.33.1.tar.gz
+
+#+NAME: dub_version_1_33_1
+#+BEGIN_SRC nix
+1.33.1
+#+END_SRC
+
+#+NAME: dub_hash_1_33_1
+#+BEGIN_SRC nix
+sha256-QFgUsO04VRXBDjGI5QQs7u9XrexG7/V34TMgJP1D8yA=
+#+END_SRC
+
+***** 1.33.0
+
+- nix-prefetch-url --unpack https://github.com/dlang/dub/archive/refs/tags/v1.33.0.tar.gz
+
+#+NAME: dub_version_1_33_0
+#+BEGIN_SRC nix
+1.33.0
+#+END_SRC
+
+#+NAME: dub_hash_1_33_0
+#+BEGIN_SRC nix
+sha256-4Mha7WF6cg3DIccfpvOnheuvgfziv/7wo8iFsPXO4yY=
+#+END_SRC
+
+**** 1.32 OK ✓
+***** 1.32.1
+
+- nix-prefetch-url --unpack https://github.com/dlang/dub/archive/refs/tags/v1.32.1.tar.gz
+
+#+NAME: dub_version_1_32_1
+#+BEGIN_SRC nix
+1.32.1
+#+END_SRC
+
+#+NAME: dub_hash_1_32_1
+#+BEGIN_SRC nix
+sha256-5pW3Fu3PQ1ZLJnsuh7fPpEBNbVQgGfFyiuMrAVOJKQA=
+#+END_SRC
+
+** dtools
+
+- https://github.com/dlang/tools
+
+*** version SET
+
+#+NAME: dtools-version
+#+BEGIN_SRC org
+<<dtools_version_2_110_0>>
+#+END_SRC
+
+#+NAME: dtools-hash
+#+BEGIN_SRC org
+<<dtools_hash_2_110_0>>
+#+END_SRC
+
+*** versions
+**** 2.110.0 OK ✓
+
+- https://github.com/dlang/tools/releases/tag/v2.110.0
+
+#+NAME: dtools_version_2_110_0
+#+BEGIN_SRC nix
+2.110.0
+#+END_SRC
+
+#+NAME: dtools_hash_2_110_0
+#+BEGIN_SRC nix
+sha256-xMEHnrstL5hAkhp8+/z1I2KZWZ7eztWZnUGLTKCfbBI=
+#+END_SRC
+
+**** 2.109.1 OK ✓
+
+- https://github.com/dlang/tools/releases/tag/v2.109.1
+
+#+NAME: dtools_version_2_109_1
+#+BEGIN_SRC nix
+2.109.1
+#+END_SRC
+
+#+NAME: dtools_hash_2_109_1
+#+BEGIN_SRC nix
+sha256-Pfj8Kwf5AlcrHhLs5A/0vIFWLZaNR3ro+esbs7oWN9I=
+#+END_SRC
+
+**** 2.104.1 OK ✓
+
+- https://github.com/dlang/tools/releases/tag/v2.104.2
+
+#+NAME: dtools_version_2_104_2
+#+BEGIN_SRC nix
+2.104.2
+#+END_SRC
+
+#+NAME: dtools_hash_2_104_2
+#+BEGIN_SRC nix
+sha256-Pfj8Kwf5AlcrHhLs5A/0vIFWLZaNR3ro+esbs7oWN9I=
+#+END_SRC
+
+** sha256 blank_hash
+
+#+NAME: blank_hash
+#+BEGIN_SRC nix
+<<sha256-blank>>
+#+END_SRC
+
+#+NAME: sha256-blank
+#+BEGIN_SRC nix
+sha256-0000000000000000000000000000000000000000000=
+#+END_SRC
+
+#+NAME: assumed_hash
+#+BEGIN_SRC nix
+sha256-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=
+#+END_SRC
+
+* __END__
diff --git a/org/sisudoc_spine_version_info_and_doc_header_including_copyright_and_license.org b/org/sisudoc_spine_version_info_and_doc_header_including_copyright_and_license.org
index ed7def8..b536386 100644
--- a/org/sisudoc_spine_version_info_and_doc_header_including_copyright_and_license.org
+++ b/org/sisudoc_spine_version_info_and_doc_header_including_copyright_and_license.org
@@ -4,7 +4,7 @@
 #+FILETAGS:    :spine:abstraction:
 #+AUTHOR:      Ralph Amissah
 #+EMAIL:       [[mailto:ralph.amissah@gmail.com][ralph.amissah@gmail.com]]
-#+COPYRIGHT:   Copyright (C) 2015 - 2024 Ralph Amissah
+#+COPYRIGHT:   Copyright (C) 2015 - 2025 Ralph Amissah
 #+LANGUAGE:    en
 #+STARTUP:     content hideblocks hidestars noindent entitiespretty
 #+PROPERTY:    header-args  :noweb yes
@@ -29,7 +29,7 @@
   - Author: Ralph Amissah
     [ralph.amissah@gmail.com]
 
-  - Copyright: (C) 2015 - 2024 Ralph Amissah, All Rights Reserved.
+  - Copyright: (C) 2015 - 2025 Ralph Amissah, All Rights Reserved.
 
   - License: AGPL 3 or later:
 
@@ -98,7 +98,7 @@
 
 #+NAME: spine_project_version_part_minor
 #+BEGIN_SRC org
-16
+18
 #+END_SRC
 
 *** patch
diff --git a/org/spine-bespoke-output-homepage-html.org b/org/spine-bespoke-output-homepage-html.org
index f0c9177..32dc9d1 100644
--- a/org/spine-bespoke-output-homepage-html.org
+++ b/org/spine-bespoke-output-homepage-html.org
@@ -609,12 +609,14 @@ ralph.amissah www since 1993 ;-)
     [ <a href="https://discourse.nixos.org/t/nixos-foundation-board-giving-power-to-the-community/44552/">
       NixOS Foundation board: Giving power to the community
     </a> ]<br>
+<!--
     [ <a href="https://aux.computer/">
         Aux - aux.computer - a community fork of nix (under deliberation), billed as "An alternative to the Nix ecosystem"
     </a> ]
     [ <a href="https://forum.aux.computer/">
         community discussion (discourse)
     </a> ]<br>
+-->
     Gnu [ <a href="https://guix.gnu.org/">
         Guix
     </a> ]
diff --git a/org/spine_info.org b/org/spine_info.org
index cc107d4..db4571a 100644
--- a/org/spine_info.org
+++ b/org/spine_info.org
@@ -208,9 +208,9 @@ instruction. The sources of relevant parts of the project are here:
   https://sisudoc.org
   https://git.sisudoc.org
 
-  git clone git://git.sisudoc.org/software/sisudoc-spine && \
-  git clone git://git.sisudoc.org/software/sisudoc-spine-search-cgi && \
-  git clone git://git.sisudoc.org/markup/sisudoc-spine-samples
+  git clone --depth=1 git://git.sisudoc.org/software/sisudoc-spine && \
+  git clone --depth=1 git://git.sisudoc.org/software/sisudoc-spine-search-cgi && \
+  git clone --depth=1 git://git.sisudoc.org/markup/sisudoc-spine-samples
 
 you may wish to clone these into a directory created for the purpose, e.g.
 
@@ -279,14 +279,6 @@ flags and configuration options
 <<sisudoc_spine_samples_rights>>
 #+END_SRC
 
-*** code org ./org
-
-#+HEADER: :tangle "../org/COPYRIGHT"
-#+HEADER: :noweb yes
-#+BEGIN_SRC text
-<<sisudoc_spine_samples_rights>>
-#+END_SRC
-
 *** org files ./org
 
 - .org literate programming:
@@ -295,7 +287,7 @@ flags and configuration options
     - license
     - dependency information
 
-#+HEADER: :tangle "./COPYRIGHT"
+#+HEADER: :tangle "../org/COPYRIGHT"
 #+HEADER: :noweb yes
 #+BEGIN_SRC text
 <<sisudoc_spine_samples_rights>>
diff --git a/shell.nix b/shell.nix
index e3920de..03942a6 100755
--- a/shell.nix
+++ b/shell.nix
@@ -7,13 +7,13 @@ with pkgs;
       # ❯❯❯ nix_related
       ##nix
       #direnv
-      #nixVersions.nix_2_21 #nixVersions.latest #nixVersions.git
+      #nixVersions.latest #nixVersions.latest #nixVersions.git
       #nix-prefetch-git
       #validatePkgConfig
       nix-output-monitor
       #nix-tree
       #jq
-      #alejandra
+      #nixfmt-rfc-style
       #git
       # ❯❯❯ dev
       #gnumake
@@ -22,14 +22,17 @@ with pkgs;
       # ❯❯ package manager
       #dub
       # ❯❯ compiler
+      #dmd
       #ldc
-      ##rund
+      #rund
       # ❯❯ linker
-      ##lld
-      ##mold
+      #lld
+      #mold
       # ❯❯ builder
-      ##ninja
-      ##meson
+      #ninja
+      #meson
+      # ❯❯ tools
+      #dtools
       # ❯❯❯ sqlite search related
       #sqlite
       # ❯❯❯ pdf_latex_related