16 files changed, 1060 insertions, 631 deletions
diff --git a/.envrc b/.envrc
index c3db812..82f6ad1 100644
--- a/.envrc
+++ b/.envrc
@@ -1,10 +1,11 @@
+# nix_direnv_watch_file provided-filename
 use flake .
 NIX_ENFORCE_PURITY=1
-NixDirEnvVersion="2.1.2"
+NixDirEnvVersion="2.2.0"
 if ! has nix_direnv_version || ! nix_direnv_version ${NixDirEnvVersion}; then
 # - https://github.com/nix-community/nix-direnv
 # source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/${NixDirEnvVersion}/direnvrc" "sha256-0000000000000000000000000000000000000000000="
-  source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/${NixDirEnvVersion}/direnvrc" "sha256-ytpQmMcUBR2czh8kGOqn/dmD6u55m3lDbeu/G8HGD7A="
+  source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/${NixDirEnvVersion}/direnvrc" "sha256-5EwyKnkJNQeXrRkYbwwRBcXbibosCJqyIUuz9Xq+LRc="
 fi
 if [ -f .envrc-local ]; then
   source_env_if_exists .envrc-local || source .envrc-local
diff --git a/.envrc-local_ b/.envrc-local_
index 1c0fa63..2a660d4 100644
--- a/.envrc-local_
+++ b/.envrc-local_
@@ -1,18 +1,19 @@
-echo ".envrc called .envrc-local"
+# reload when these files change
+watch_file flake.lock
+watch_file flake.nix
+nix flake update; nix flake check; nix flake show
+#use flake .#default
 PATH_add result/bin
 export NIX_PATH=/nix/var/nix/profiles/per-user/root/channels/nixos
-#export NIX_PATH=nixpkgs=/nixpkgs/nixpkgs
-#export NIX_PATH=/nixpkgs/nixpkgs
+#export NIX_PATH=/srv/nix/nixpkgs
+#export NIX_PATH=nixpkgs=/srv/nix/nixpkgs
 export DFLAGS="-O2 -inline -boundscheck=on -color=on"
-# reload when these files change
-# watch_file flake.nix
-# watch_file flake.lock
 ## load the flake devShell
 # eval "$(nix print-dev-env)"
 # echo $NIX_BUILD_TOP
 export Date=`date "+%Y%m%d"`
 export SpineVER=$(git describe --long --tags | sed 's/^[ a-z_-]\+\([0-9.]\+\)/\1/;s/\([^-]*-g\)/r\1/;s/-/./g')
-export SpinePROJ=~/grotto/repo/git.repo/projects/project-spine/doc-reform
+export SpinePROJ=~/grotto/repo/git.repo/projects/doc-reform/code/software/spine
 export SpineSRC=$SpinePROJ/src
 export SpineBIN=$SpinePROJ/result/bin
 export SpineDOC=~/grotto/repo/git.repo/projects/project-spine/doc-reform-markup/spine-markup-samples
@@ -27,4 +28,3 @@ export SpineCGIform='spine_search'
 export SpineSQLdb='spine.search.db'
 export PROG_VER_GIT="`git describe --long --tags | sed -e 's/^[ a-z_-]\+\([0-9.]\+\)/\1/;s/\([^-]*-g\)/r\1/;s/-/./g'`"
 export PROG_VER_DECLARED="`cat ./views/version.txt | grep --color=never "enum" | sed 's/.\+(\([0-9]\+\),[ \t]\+\([0-9]\+\),[ \t]\+\([0-9]\+\)[ \t]*).\+/\1.\2.\3/g'`"
-#direnv allow
diff --git a/.gitignore b/.gitignore
index 0514a2e..42baa60 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,11 +6,9 @@
 *
 !.gitignore
 !.gitattributes
-!*.nix
-!nix
 !nix/**
 !*.nix
-#!flake.lock
+!flake.lock
 !.envrc
 !README.md
 !README
@@ -29,7 +27,6 @@
 !*.d
 !*.rb
 !*.txt
-!conf.sdl
 !doc
 !doc/**
 !man
@@ -69,6 +66,7 @@ notes/**
 **/cgi-bin/**
 tmp/**
 *_.org
+*_.nix
 *_.d
 *_.txt
 *_
diff --git a/default.nix b/default.nix
index 72f4f02..f00ab4c 100755
--- a/default.nix
+++ b/default.nix
@@ -1,3 +1,3 @@
 #!/usr/bin/env -S nix-build
 { pkgs ? import <nixpkgs> {} }:
-pkgs.callPackage ./derivation.nix {}
+pkgs.callPackage ./devenv.nix {}
diff --git a/derivation.nix b/derivation.nix
index 4f1c1c4..da3c183 100644
--- a/derivation.nix
+++ b/derivation.nix
@@ -85,7 +85,7 @@ mkDubDerivation rec {
   meta = with pkgs.lib; {
     description = "A sisu like parser and document generator";
     longDescription = ''
-      A sisu like parser and document generator
+      a sisu like parser and document generator
     '';
     homepage    = "https://sisudoc.org";
     license     = licenses.agpl3Plus;
diff --git a/devenv.nix b/devenv.nix
new file mode 100644
index 0000000..81eff5a
--- /dev/null
+++ b/devenv.nix
@@ -0,0 +1,63 @@
+# profile.nix
+{ pkgs ? import <nixpkgs> { }, name ? "user-env"  }: with pkgs;
+buildEnv {
+  inherit name;
+  extraOutputsToInstall = [ "out" "man" "lib"  ]; # to get all needed symlinks
+  paths = [
+    #nix # if not on NixOS, this is needed
+    direnv
+    nixVersions.unstable #nixFlakes
+    nix-prefetch-git
+    validatePkgConfig
+    nix-tree jq nix-output-monitor
+    git
+    ps
+    ### d_build_related
+    dub
+    ## compiler
+    dmd
+    ldc
+    #gdc
+    #rund
+    ## linker
+    #lld
+    #mold
+    ## builder
+    #ninja
+    #meson
+    ### sqlite search related
+    sqlite
+    # ### pdf_latex_related
+    # source-sans-pro
+    # source-serif-pro
+    # source-code-pro
+    # texlive.combined.scheme-full
+    # ### xml_and_epub_related
+    # libxml2
+    # html-tidy
+    # xmlstarlet
+    # epubcheck
+    # ebook_tools
+    # epr
+    # sigil
+    # calibre #(suite includes: ebook-viewer)
+    # foliate
+    # ### i18n translation related
+    # perl534Packages.Po4a
+    ### candy
+    #starship
+    # this will create a script that will rebuild and upgrade your setup; using shell script syntax
+    (writeScriptBin "nix-rebuild" ''
+      #!${stdenv.shell}
+      cd <path-to-flake> || exit 1
+      nix flake update
+      nix profile upgrade '.*'
+    '')
+    # puts in your root the nixpkgs version
+    (writeTextFile {
+      name = "nixpkgs-version";
+      destination = "/nixpkgs-version";
+      text = lib.version;
+    })
+  ];
+}
diff --git a/dub.json b/dub.json
index ffe3e0d..44c6a4f 100644
--- a/dub.json
+++ b/dub.json
@@ -17,12 +17,27 @@
   "buildTypes": {
     "dmd": {
       "dflags":                [ "-J=views", "-I=src/doc_reform" ],
-      "buildOptions":          [ "verbose", "inline" ],
+      "buildOptions":          [ "inline", "verbose"  ],
       "buildRequirements":     [ "allowWarnings" ]
     },
-    "ldc": {
+    "ldc2": {
       "dflags":                [ "-O2", "-J=views", "-I=src/doc_reform" ],
-      "buildOptions":          [ "verbose", "optimize", "inline" ],
+      "buildOptions":          [ "optimize", "inline", "verbose" ],
+      "buildRequirements":     [ "allowWarnings" ]
+    },
+    "ldmd2": {
+      "dflags":                [ "-O2", "-boundscheck=on", "-J=views", "-I=src/doc_reform", "-color=on" ],
+      "buildOptions":          [ "optimize", "inline", "verbose"  ],
+      "buildRequirements":     [ "allowWarnings" ]
+    },
+    "gdc": {
+      "dflags":                [ "-O2", "-J=views", "-I=src/doc_reform" ],
+      "buildOptions":          [ "optimize", "inline" ],
+      "buildRequirements":     [ "allowWarnings" ]
+    },
+    "gdmd": {
+      "dflags":                [ "-O2", "-J=views", "-I=src/doc_reform" ],
+      "buildOptions":          [ "optimize", "inline" ],
       "buildRequirements":     [ "allowWarnings" ]
     }
   },
@@ -35,8 +50,8 @@
     {
       "name":        "d2sqlite3",
       "description": "A thin wrapper around SQLite 3",
-      "homepage":  "https://github.com/dlang-community/d2sqlite3",
-      "authors":    [ "Nicolas Sicard", "Other contributors: see Github repo" ],
+      "homepage":    "https://github.com/dlang-community/d2sqlite3",
+      "authors":     [ "Nicolas Sicard", "Other contributors: see Github repo" ],
       "copyright":   "Copyright 2011-18 Nicolas Sicard",
       "license":     "BSL-1.0",
       "sourcePaths": [ "./src/ext_depends/d2sqlite3/source" ],
@@ -61,15 +76,15 @@
       "importPaths": [ "./src/ext_depends/imageformats" ]
     },
     {
-      "name": "dyaml",
+      "name":        "dyaml",
       "description": "YAML parser and emitter",
       "authors": [
         "Ferdinand Majerech",
         "Cameron \"Herringway\" Ross"
       ],
-      "license": "BSL-1.0",
-      "homepage": "https://github.com/dlang-community/D-YAML",
-      "copyright": "Copyright © 2011-2018, Ferdinand Majerech",
+      "license":     "BSL-1.0",
+      "homepage":    "https://github.com/dlang-community/D-YAML",
+      "copyright":   "Copyright © 2011-2018, Ferdinand Majerech",
       "sourcePaths": [
         "./src/ext_depends/D-YAML/source",
         "./src/ext_depends/tinyendian/source"
@@ -90,12 +105,20 @@
       "targetName":            "spine"
     },
     {
-      "name":                  "ldc",
+      "name":                  "ldc2",
+      "targetName":            "spine-ldc"
+    },
+    {
+      "name":                  "ldmd2",
       "targetName":            "spine-ldc"
     },
     {
       "name":                  "dmd",
       "targetName":            "spine-dmd"
+    },
+    {
+      "name":                  "gdc",
+      "targetName":            "spine-gdc"
     }
   ]
 }
diff --git a/flake.lock b/flake.lock
index 733e33e..5154297 100644
--- a/flake.lock
+++ b/flake.lock
@@ -17,15 +17,16 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1671837212,
-        "narHash": "sha256-16nCDyLIocvo6XZ8CuvExTtfJoF6zrUZOlH4JfGxHOI=",
-        "owner": "nixos",
+        "lastModified": 1672428209,
+        "narHash": "sha256-eejhqkDz2cb2vc5VeaWphJz8UXNuoNoM8/Op8eWv2tQ=",
+        "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "59cf8b7a71488c65ccbe2b993602a0b5dcf8f5f6",
+        "rev": "293a28df6d7ff3dec1e61e37cc4ee6e6c0fb0847",
         "type": "github"
       },
       "original": {
-        "owner": "nixos",
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
         "repo": "nixpkgs",
         "type": "github"
       }
diff --git a/flake.nix b/flake.nix
index c188d21..e615ae9 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,81 +1,88 @@
 {
-  description = "a sisu like parser and document generator";
-  inputs.flake-utils.url = "github:numtide/flake-utils";
-  inputs.nixpkgs.url = "github:nixos/nixpkgs";
-  #inputs.nixpkgs.url = "/nixpkgs-ra/nixpkgs";
-  outputs = { self, nixpkgs, flake-utils }: {
-    packages.x86_64-linux.spine =
-      let
-        pkgs = import nixpkgs {
-          system = "x86_64-linux";
+  description                  = "a sisu like parser & document generator";
+  inputs.nixpkgs.url           = "github:NixOS/nixpkgs/nixpkgs-unstable"; # "github:nixos/nixpkgs"; "github:NixOS/nixpkgs/nixpkgs-unstable"; "nixpkgs/nixos-unstable"; "nixpkgs/nixos-21.11";
+  inputs.flake-utils.url       = "github:numtide/flake-utils";
+  outputs = { self, nixpkgs, flake-utils }:
+    let
+      version                  = "0.12.0";
+      supportedSystems         = [ "x86_64-linux" ]; # [ "x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin"  ];
+      forAllSystems            = nixpkgs.lib.genAttrs supportedSystems;
+      nixpkgsFor               = forAllSystems (system: import nixpkgs { inherit system;  }); # nixpkgs instantiated for supported system types.
+    in {
+      packages = forAllSystems (system:
+        let pkgs               = nixpkgsFor.${system};
+        in with pkgs; {
+          default = stdenv.mkDerivation {
+            pname              = "spine";
+            inherit version;
+            meta.mainProgram   = "spine";
+            executable         = true;
+            src                = self;
+            shell              = ./default.nix;
+            devEnv             = ./devenv.nix;
+            buildInputs        = [ sqlite ];
+            nativeBuildInputs  = [ dub dmd ]; # [ dub dmd ]; [ dub ldc ]; [ dub gdc ];
+            buildPhase = ''
+              runHook preBuild
+              HOME="$PWD"
+              for DC_ in dmd ldmd2 ldc2 gdc gdmd; do
+                echo "- check for D compiler $DC_"
+                DC=$(type -P $DC_ || echo "")
+                if [ ! "$DC" == "" ]; then break; fi
+              done
+              if [ "$DC" == "" ]; then exit "Error: could not find D compiler"; fi
+              echo "$DC_ used as D compiler to build $pname"
+              dub build --compiler=$DC --build=$DC_ --combined --skip-registry=all
+              runHook postBuild
+            '';
+            checkPhase = ''
+              runHook preCheck
+              HOME="$PWD"
+              dub test --combined --skip-registry=all
+              runHook postCheck
+            '';
+            installPhase = ''
+              runHook preInstall
+              mkdir -p $out/bin
+              install -m755 ./bin/spine $out/bin/spine
+              runHook postInstall
+            '';
+            postInstall = ''
+              echo `ls -la $out/bin/spine`
+              echo "
+              nix build or nix develop? (suggestions):
+              - nix build
+                nix build .#default --print-build-logs
+                nix flake update; nix build .#default --print-build-logs
+                  nix build --print-build-logs
+              - nix run
+                nix run .#default --print-build-logs
+                nix run default.nix --print-build-logs
+              - nix shell
+                nix shell .#default --print-build-logs --command spine -v
+              - nix develop
+                nix develop --profile .#default --print-build-logs --command spine -v
+                nix develop ; eval \"$buildPhase\"
+                nix develop --build -f derivation.nix -I .envrc --print-build-logs
+              - nix profile install . --print-build-logs
+              spine -v
+              nix-instantiate | nix show-derivation | jq
+              "
+              $out/bin/spine -v
+            '';
+          };
+          #vendorSha256 = "sha256-0Q00000000000000000000000000000000000000000=";
+        });
+      apps = forAllSystems (system: {
+        default = {
+          type                 = "app";
+          program              = "${self.packages.${system}.default}/bin/spine";
         };
-        #targetOf = package: "${package.targetPath or "."}/${package.targetName or package.name}";
-      in pkgs.stdenv.mkDerivation {
-        pname       = "spine";
-        version     = "0.12.0";
-        description = "a sisu like parser and document generator";
-        inherit self;
-        src = self;
-        shell = ./shell.nix;
-        buildPhase = ''
-          runHook preBuild
-          HOME="$PWD"
-          DFLAGS="-O2 -inline"
-          for DC_ in dmd ldmd2 gdmd; do
-            echo "- check for D compiler $DC_"
-            DC=$(type -P $DC_ || echo "")
-            if [ ! "$DC" == "" ]; then break; fi
-          done
-          if [ "$DC" == "" ]; then
-            exit "Error: could not find D compiler"
-          fi
-          echo "$DC_ used as D compiler to build $pname"
-          dub build --compiler=$DC --build=release --combined --skip-registry=all
-          runHook postBuild
-        '';
-        checkPhase = ''
-          runHook preCheck
-          HOME="$PWD"
-          dub test --combined --skip-registry=all
-          runHook postCheck
-        '';
-        installPhase = ''
-          runHook preInstall
-          mkdir -p $out/bin
-          install -m755 ./bin/spine $out/bin/spine
-          #cp -r bin/spine $out/bin/.
-          runHook postInstall
-        '';
-        postInstall = ''
-          echo `ls -la $out/bin/spine`
-          echo ""
-          echo "nix build or nix develop? (suggestions):"
-          echo '- nix build'
-          echo '  nix build .#spine --print-build-logs'
-          echo '    nix build --print-build-logs'
-          echo '- nix run'
-          echo '  nix run .#spine --print-build-logs'
-          echo '  nix run default.nix --print-build-logs'
-          echo '- nix shell'
-          echo '  nix shell --print-build-logs --command spine -v'
-          echo '- nix develop'
-          echo '  nix develop --build -f derivation.nix -I .envrc --print-build-logs'
-          echo '    nix develop ; eval "$buildPhase"'
-          echo 'spine -v'
-          echo 'nix-instantiate | nix show-derivation | jq'
-          echo `ls -la $out/bin/spine`
-          echo "built:"
-          $out/bin/spine -v
-        '';
-        nativeBuildInputs = with pkgs; [ ldc dub ];
-        buildInputs = with pkgs; [ sqlite ];
-     };
-     packages.x86_64-linux.default = self.packages.x86_64-linux.spine;
+      });
+      devShells = forAllSystems (system:
+        let pkgs               = nixpkgsFor.${system};
+        in with pkgs; {
+          devShell             = mkShell { buildInputs = [ git dub dmd ldc gdc sqlite ]; };
+        });
   };
 }
-
-#nix flake update
-#nix flake check
-#nix flake show
-#nix develop
-#nix build .#default --print-build-logs
diff --git a/makefile b/makefile
index 770cc7e..7f4eb38 100644
--- a/makefile
+++ b/makefile
@@ -50,7 +50,7 @@ data/pod/un_contracts_international_sale_of_goods_convention_1980 \
 data/pod/viral_spiral.david_bollier
 # SiSU_MARKUP_SAMPLES_DIR_FILES_FOUND = \
 # find data/sisudir/media/text -name *.ss[tm] | sort | xargs
-#
+# 
 # SiSU_MARKUP_SAMPLES_DIR = \
 # data/sisudir/media/text/accelerando.charles_stross.sst \
 # data/sisudir/media/text/alices_adventures_in_wonderland.lewis_carroll.sst \
@@ -78,7 +78,7 @@ data/pod/viral_spiral.david_bollier
 # data/sisudir/media/text/two_bits.christopher_kelty.sst \
 # data/sisudir/media/text/un_contracts_international_sale_of_goods_convention_1980.sst \
 # data/sisudir/media/text/viral_spiral.david_bollier.sst
-#
+# 
 Date                    := `date "+%Y%m%d"`
 SpineBIN                := "${SpineBIN}" # './result/bin'
 SpineOUT                := "${SpineOUT}" # '/srv/www/spine'
@@ -446,13 +446,13 @@ depends_set: depends_get
 # markup_samples:
 # 	find data/pod -name pod.manifest | cut -f 1-3 -d / | sort; \
 # 	find data/sisudir/media/text -name *.ss[tm] | sort
-#
+# 
 # markup_pod_samples:
 # 	find data/pod -name pod.manifest | cut -f 1-3 -d / | sort
-#
+# 
 # markup_dir_samples:
 # 	find data/sisudir/media/text -name *.ss[tm] | sort
-#
+# 
 version_tag:
 	echo "DRV=0.12.0; git tag -f doc-reform_v$$\{DRV} -m\"doc-reform $$\{DRV}\" HEAD" && \
 	echo "git tag -f doc-reform_v0.12.0 -m\"doc-reform spine-0.12.0\" HEAD"
@@ -1156,7 +1156,7 @@ nix-shell-pure:
 
 # nix-shell (with local tools, presumably latest dlang compiler & build tools (ldc & dub))
 nix-shell-updated:
-	nix-shell -I nixpkgs=/nixpkgs-ra/nixpkgs --pure
+	nix-shell -I nixpkgs=/nix/nixpkgs --pure
 
 # shell.nix (with shebang)
 shell:
@@ -1198,7 +1198,7 @@ _flake-show-derivation:
 	nix show-derivation |jq;
 
 nix-develop:
-	nix develop -f default.nix -I nixpkgs=/nixpkgs-ra/nixpkgs
+	nix develop -f default.nix -I nixpkgs=/nix/nixpkgs
 
 # nix flake show
 flake-show: _flake-show-package _flake-show-name _flake-show-derivation
@@ -1217,7 +1217,7 @@ flake-build-debug:
 
 # nix-build spine (with local tools, presumably latest dlang compiler & build tools (ldc & dub))
 flake-build-use-tools-new:
-	nix build --print-build-logs -I nixpkgs=/nixpkgs-ra/nixpkgs
+	nix build --print-build-logs -I nixpkgs=/nix/nixpkgs
 
 # tangle-build-flake
 flake-tangle-build: org-tangle flake-build
diff --git a/org/config_dub.org b/org/config_dub.org
index 0384378..13f57ff 100644
--- a/org/config_dub.org
+++ b/org/config_dub.org
@@ -66,12 +66,27 @@
   "buildTypes": {
     "dmd": {
       "dflags":                [ "-J=views", "-I=src/doc_reform" ],
-      "buildOptions":          [ "verbose", "inline" ],
+      "buildOptions":          [ "inline", "verbose"  ],
       "buildRequirements":     [ "allowWarnings" ]
     },
-    "ldc": {
+    "ldc2": {
       "dflags":                [ "-O2", "-J=views", "-I=src/doc_reform" ],
-      "buildOptions":          [ "verbose", "optimize", "inline" ],
+      "buildOptions":          [ "optimize", "inline", "verbose" ],
+      "buildRequirements":     [ "allowWarnings" ]
+    },
+    "ldmd2": {
+      "dflags":                [ "-O2", "-boundscheck=on", "-J=views", "-I=src/doc_reform", "-color=on" ],
+      "buildOptions":          [ "optimize", "inline", "verbose"  ],
+      "buildRequirements":     [ "allowWarnings" ]
+    },
+    "gdc": {
+      "dflags":                [ "-O2", "-J=views", "-I=src/doc_reform" ],
+      "buildOptions":          [ "optimize", "inline" ],
+      "buildRequirements":     [ "allowWarnings" ]
+    },
+    "gdmd": {
+      "dflags":                [ "-O2", "-J=views", "-I=src/doc_reform" ],
+      "buildOptions":          [ "optimize", "inline" ],
       "buildRequirements":     [ "allowWarnings" ]
     }
   },
@@ -84,8 +99,8 @@
     {
       "name":        "d2sqlite3",
       "description": "A thin wrapper around SQLite 3",
-      "homepage":  "https://github.com/dlang-community/d2sqlite3",
-      "authors":    [ "Nicolas Sicard", "Other contributors: see Github repo" ],
+      "homepage":    "https://github.com/dlang-community/d2sqlite3",
+      "authors":     [ "Nicolas Sicard", "Other contributors: see Github repo" ],
       "copyright":   "Copyright 2011-18 Nicolas Sicard",
       "license":     "BSL-1.0",
       "sourcePaths": [ "./src/ext_depends/d2sqlite3/source" ],
@@ -110,15 +125,15 @@
       "importPaths": [ "./src/ext_depends/imageformats" ]
     },
     {
-      "name": "dyaml",
+      "name":        "dyaml",
       "description": "YAML parser and emitter",
       "authors": [
         "Ferdinand Majerech",
         "Cameron \"Herringway\" Ross"
       ],
-      "license": "BSL-1.0",
-      "homepage": "https://github.com/dlang-community/D-YAML",
-      "copyright": "Copyright © 2011-2018, Ferdinand Majerech",
+      "license":     "BSL-1.0",
+      "homepage":    "https://github.com/dlang-community/D-YAML",
+      "copyright":   "Copyright © 2011-2018, Ferdinand Majerech",
       "sourcePaths": [
         "./src/ext_depends/D-YAML/source",
         "./src/ext_depends/tinyendian/source"
@@ -139,12 +154,20 @@
       "targetName":            "spine"
     },
     {
-      "name":                  "ldc",
+      "name":                  "ldc2",
+      "targetName":            "spine-ldc"
+    },
+    {
+      "name":                  "ldmd2",
       "targetName":            "spine-ldc"
     },
     {
       "name":                  "dmd",
       "targetName":            "spine-dmd"
+    },
+    {
+      "name":                  "gdc",
+      "targetName":            "spine-gdc"
     }
   ]
 }
diff --git a/org/config_git.org b/org/config_git.org
index 328a192..303b4e7 100644
--- a/org/config_git.org
+++ b/org/config_git.org
@@ -30,11 +30,9 @@
 ,*
 !.gitignore
 !.gitattributes
-!*.nix
-!nix
 !nix/**
 !*.nix
-#!flake.lock
+!flake.lock
 !.envrc
 !README.md
 !README
@@ -53,7 +51,6 @@
 !*.d
 !*.rb
 !*.txt
-!conf.sdl
 !doc
 !doc/**
 !man
@@ -93,6 +90,7 @@ notes/**
 ,**/cgi-bin/**
 tmp/**
 ,*_.org
+,*_.nix
 ,*_.d
 ,*_.txt
 ,*_
@@ -107,3 +105,15 @@ tmp/**
 #*.\#*
 #.reggae/**
 #+END_SRC
+
+** gitattributes :gitattributes:
+
+#+HEADER: :tangle "../.gitattributes"
+#+BEGIN_SRC sh
+/org export-ignore
+/subprojects export-ignore
+/build export-ignore
+.gitattributes export-ignore
+tangle export-ignore
+flake.lock export-ignore
+#+END_SRC
diff --git a/org/config_make.org b/org/config_make.org
index cfbd01a..5451130 100644
--- a/org/config_make.org
+++ b/org/config_make.org
@@ -1628,7 +1628,7 @@ nix-shell-pure:
 
 # nix-shell (with local tools, presumably latest dlang compiler & build tools (ldc & dub))
 nix-shell-updated:
-	nix-shell -I nixpkgs=/nixpkgs-ra/nixpkgs --pure
+	nix-shell -I nixpkgs=/nix/nixpkgs --pure
 
 # shell.nix (with shebang)
 shell:
@@ -1670,7 +1670,7 @@ _flake-show-derivation:
 	nix show-derivation |jq;
 
 nix-develop:
-	nix develop -f default.nix -I nixpkgs=/nixpkgs-ra/nixpkgs
+	nix develop -f default.nix -I nixpkgs=/nix/nixpkgs
 
 # nix flake show
 flake-show: _flake-show-package _flake-show-name _flake-show-derivation
@@ -1689,7 +1689,7 @@ flake-build-debug:
 
 # nix-build spine (with local tools, presumably latest dlang compiler & build tools (ldc & dub))
 flake-build-use-tools-new:
-	nix build --print-build-logs -I nixpkgs=/nixpkgs-ra/nixpkgs
+	nix build --print-build-logs -I nixpkgs=/nix/nixpkgs
 
 # tangle-build-flake
 flake-tangle-build: org-tangle flake-build
@@ -1732,8 +1732,8 @@ gitsnapshot: distclean tangle
 #+HEADER: :NO-tangle ../.env/local
 #+BEGIN_SRC sh
 export NIX_PATH=/nix/var/nix/profiles/per-user/root/channels/nixos
-#export NIX_PATH=nixpkgs=/nixpkgs-ra/nixpkgs
-#export NIX_PATH=/nixpkgs-ra/nixpkgs
+#export NIX_PATH=nixpkgs=/nix/nixpkgs
+#export NIX_PATH=/nix/nixpkgs
 # reload when these files change
 # watch_file flake.nix
 # watch_file flake.lock
diff --git a/org/config_nix.org b/org/config_nix.org
index 86c61ee..50583a1 100644
--- a/org/config_nix.org
+++ b/org/config_nix.org
@@ -19,50 +19,7 @@
 
 #+NAME: nixpkgs_local
 #+BEGIN_SRC sh
-/nixpkgs-ra/nixpkgs
-#+END_SRC
-
-** NOTES
-*** nix-shell
-
-- default.nix
-
-#+BEGIN_SRC sh
-nix-shell
-nix-build
-#+END_SRC
-
-- project.nix
-
-#+BEGIN_SRC sh
-nix-shell
-nix-build project.nix
-#+END_SRC
-
-*** nix-shell --pure
-
-- default.nix
-
-#+HEADER: :noweb yes
-#+BEGIN_SRC sh
-nix-shell --pure
-nix-build -I nixpkgs=<<nixpkgs_local>>
-nix-build -I .envrc
-#+END_SRC
-
-#+BEGIN_SRC sh
-nix build -f default.nix --print-build-logs
-nix build -f derivation.nix --print-build-logs
-nix shell -f default.nix --print-build-logs
-# nix build -f project.nix
-# nix build -f spine.nix
-nix develop --build -f derivation.nix -I .envrc --print-build-logs
-#+END_SRC
-
-*** derivation .drv
-
-#+BEGIN_SRC sh
-nix show-derivation /nix/store/q7n14bm8j5vzm62qaraczdb4bpyf59vv-spine-0.11.1.drv
+/srv/nix/nixpkgs
 #+END_SRC
 
 ** spine
@@ -78,89 +35,43 @@ nix show-derivation /nix/store/q7n14bm8j5vzm62qaraczdb4bpyf59vv-spine-0.11.1.drv
 
 #+HEADER: :tangle ../.envrc
 #+BEGIN_SRC sh
+# nix_direnv_watch_file provided-filename
 use flake .
 NIX_ENFORCE_PURITY=1
-NixDirEnvVersion="2.1.2"
+NixDirEnvVersion="2.2.0"
 if ! has nix_direnv_version || ! nix_direnv_version ${NixDirEnvVersion}; then
 # - https://github.com/nix-community/nix-direnv
 # source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/${NixDirEnvVersion}/direnvrc" "sha256-0000000000000000000000000000000000000000000="
-  source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/${NixDirEnvVersion}/direnvrc" "sha256-ytpQmMcUBR2czh8kGOqn/dmD6u55m3lDbeu/G8HGD7A="
+  source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/${NixDirEnvVersion}/direnvrc" "sha256-5EwyKnkJNQeXrRkYbwwRBcXbibosCJqyIUuz9Xq+LRc="
 fi
 if [ -f .envrc-local ]; then
   source_env_if_exists .envrc-local || source .envrc-local
 fi
 #+END_SRC
 
-- lorri?
-
-#+HEADER: :NO-tangle ../.envrc
-#+BEGIN_SRC sh
-if type lorri &>/dev/null; then
-  echo "direnv: using lorri from PATH ($(type -p lorri))"
-  # eval "$(lorri direnv)"
-else # fallback prevent bootstrapping problems by using direnv's builtin nix support
-  use nix
-  NIX_ENFORCE_PURITY=0
-fi
-if [ -f .envrc-local ]; then
-  source_env_if_exists .envrc-local || source .envrc-local
-fi
-#+END_SRC
-
-- enable flakes
-
-#+HEADER: :NO-tangle ../.envrc
-#+BEGIN_SRC sh
-if [ -f flake.lock ] && [ -f flake.nix ]; then
-    # reload when these files change
-    watch_file flake.nix
-    watch_file flake.lock
-    # load the flake devShell
-    if [ ! -d $(direnv_layout_dir) ]; then
-        mkdir $(direnv_layout_dir)
-    fi
-    eval "$(nix --experimental-features 'nix-command flakes' print-dev-env --profile "$(direnv_layout_dir)/flake-profile")"
-else
-    # fall back to using direnv's builtin nix support
-    # to prevent bootstrapping problems.
-  #  use nix
-  if type lorri &>/dev/null; then
-      echo "direnv: using lorri from PATH ($(type -p lorri))"
-      eval "$(lorri direnv)"
-  else
-      # fall back to using direnv's builtin nix support
-      # to prevent bootstrapping problems.
-      use nix
-      NIX_ENFORCE_PURITY=0
-  fi
-  if [ -f .envrc-local ]; then
-    source_env_if_exists .envrc-local || source .envrc-local
-  fi
-fi
-#+END_SRC
-
 **** .envrc-local CHECK MODIFY
 
 - bespoke modify appropriately and generate if needed
 
 #+HEADER: :tangle ../.envrc-local_
 #+HEADER: :noweb yes
-#+BEGIN_SRC nix
-echo ".envrc called .envrc-local"
+#+BEGIN_SRC sh
+# reload when these files change
+watch_file flake.lock
+watch_file flake.nix
+nix flake update; nix flake check; nix flake show
+#use flake .#default
 PATH_add result/bin
 export NIX_PATH=/nix/var/nix/profiles/per-user/root/channels/nixos
-#export NIX_PATH=nixpkgs=/nixpkgs/nixpkgs
-#export NIX_PATH=/nixpkgs/nixpkgs
+#export NIX_PATH=/srv/nix/nixpkgs
+#export NIX_PATH=nixpkgs=/srv/nix/nixpkgs
 export DFLAGS="-O2 -inline -boundscheck=on -color=on"
-# reload when these files change
-# watch_file flake.nix
-# watch_file flake.lock
 ## load the flake devShell
 # eval "$(nix print-dev-env)"
 # echo $NIX_BUILD_TOP
 export Date=`date "+%Y%m%d"`
 export SpineVER=$(git describe --long --tags | sed 's/^[ a-z_-]\+\([0-9.]\+\)/\1/;s/\([^-]*-g\)/r\1/;s/-/./g')
-export SpinePROJ=~/grotto/repo/git.repo/projects/project-spine/doc-reform
+export SpinePROJ=~/grotto/repo/git.repo/projects/doc-reform/code/software/spine
 export SpineSRC=$SpinePROJ/src
 export SpineBIN=$SpinePROJ/result/bin
 export SpineDOC=~/grotto/repo/git.repo/projects/project-spine/doc-reform-markup/spine-markup-samples
@@ -175,295 +86,183 @@ export SpineCGIform='spine_search'
 export SpineSQLdb='spine.search.db'
 export PROG_VER_GIT="`git describe --long --tags | sed -e 's/^[ a-z_-]\+\([0-9.]\+\)/\1/;s/\([^-]*-g\)/r\1/;s/-/./g'`"
 export PROG_VER_DECLARED="`cat ./views/version.txt | grep --color=never "enum" | sed 's/.\+(\([0-9]\+\),[ \t]\+\([0-9]\+\),[ \t]\+\([0-9]\+\)[ \t]*).\+/\1.\2.\3/g'`"
-#direnv allow
 #+END_SRC
 
-**** .env/echo-nixNote CHECK MODIFY
-
-#+HEADER: :tangle ../.env/echo-nixNote
-#+BEGIN_SRC sh
-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" $SpineDOC/spine-markup-samples/markup/pod/*
-,#+END_SRC
-
-,*** sqlite db (shared) - drop db
-
-,#+BEGIN_SRC sh
-$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="<<spine_search_db>>" --sqlite-db-path="$SpineDBpath"
-$SpineBIN/spine -v --sqlite-db-recreate --sqlite-db-filename="<<spine_search_db>>" --sqlite-db-path="$SpineDBpath"
-,#+END_SRC
-
-,*** populate sqlite db
-
-,#+BEGIN_SRC sh
-$SpineBIN/spine -v --sqlite-update --sqlite-db-filename="<<spine_search_db>>" --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="<<spine_search_db>>" --cgi-sqlite-search-filename="<<spine_search_cgi>>" --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
+*** flake :flake:
+**** flake
+***** flake.nix
 
-,#+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:           "<<spine_search_cgi>>"
-  cgi_action:                  "https://sisudoc.org/spine_search"
-  db_sqlite_filename:          "<<spine_search_db>>"
-  db_sqlite_path:              "/var/www/sqlite"
-,#+END_SRC
+#+HEADER: :tangle ../flake.nix
+#+HEADER: :noweb yes
+#+BEGIN_SRC nix
+{
+  description                  = "a sisu like parser & document generator";
+  inputs.nixpkgs.url           = "github:NixOS/nixpkgs/nixpkgs-unstable"; # "github:nixos/nixpkgs"; "github:NixOS/nixpkgs/nixpkgs-unstable"; "nixpkgs/nixos-unstable"; "nixpkgs/nixos-21.11";
+  inputs.flake-utils.url       = "github:numtide/flake-utils";
+  outputs = { self, nixpkgs, flake-utils }:
+    let
+      version                  = "<<spine_version_set>>";
+      supportedSystems         = [ "x86_64-linux" ]; # [ "x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin"  ];
+      forAllSystems            = nixpkgs.lib.genAttrs supportedSystems;
+      nixpkgsFor               = forAllSystems (system: import nixpkgs { inherit system;  }); # nixpkgs instantiated for supported system types.
+    in {
+      packages = forAllSystems (system:
+        let pkgs               = nixpkgsFor.${system};
+        in with pkgs; {
+          default = stdenv.mkDerivation {
+            pname              = "spine";
+            inherit version;
+            meta.mainProgram   = "spine";
+            executable         = true;
+            src                = self;
+            shell              = ./default.nix;
+            devEnv             = ./devenv.nix;
+            buildInputs        = [ sqlite ];
+            nativeBuildInputs  = [ dub dmd ]; # [ dub dmd ]; [ dub ldc ]; [ dub gdc ];
+            <<flake_phases>>
+          };
+          #vendorSha256 = "sha256-0Q00000000000000000000000000000000000000000=";
+        });
+      apps = forAllSystems (system: {
+        default = {
+          type                 = "app";
+          program              = "${self.packages.${system}.default}/bin/spine";
+        };
+      });
+      devShells = forAllSystems (system:
+        let pkgs               = nixpkgsFor.${system};
+        in with pkgs; {
+          devShell             = mkShell { buildInputs = [ git dub dmd ldc gdc sqlite ]; };
+        });
+  };
+}
+#+END_SRC
 
-,*** make search form
+**** some other possible flakes (samples)
+***** flake 0
 
-,#+BEGIN_SRC sh
-$SpineBIN/spine -v --cgi-search-form-codegen --config=$SpinePOD/.dr/config_local_site
-,#+END_SRC
+#+NAME: flake_0
+#+HEADER: :noweb yes
+#+BEGIN_SRC nix
+{
+  description = "a sisu like parser & document generator";
+  inputs.<<flake_inputs_nix>>
+  outputs = { <<flake_outputs>> }: {
+    <<flake_output_spine>>
+    <<flake_output_default>>
+  };
+}
+#+END_SRC
 
-,*** latex
+***** flake single system
 
-,#+BEGIN_SRC sh
-$SpineBIN/spine --latex --serial --output="$SpineOUT" $SpinePOD/*
-ls $SpineOutstatic/latex/*.tex
-,#+END_SRC
-' >> nixNote_.org
+#+NAME: flake_single_sytem
+#+HEADER: :tangle ../flake-1-single-system_.nix
+#+HEADER: :noweb yes
+#+BEGIN_SRC nix
+{
+  description                = "a sisu like parser & document generator";
+  inputs.<<flake_inputs_nix>>
+  outputs = { <<flake_outputs>> }: {
+    packages.x86_64-linux.spine =
+      let
+        pkgs = import nixpkgs {
+          system = "x86_64-linux";
+        };
+        #targetOf = package: "${package.targetPath or "."}/${package.targetName or package.name}";
+      in pkgs.stdenv.mkDerivation {
+        <<flake_metadata>>
+        inherit self;
+        src = self;
+        #shell = ./shell.nix;
+        shell = ./default.nix;
+        devEnv = ./devenv.nix;
+        <<flake_phases>>
+        buildInputs       = [ sqlite ];
+        nativeBuildInputs = with pkgs; [ dub <<d-compiler>> ]; # [ dmd dub ]; [ ldc dub ]; [ gdc dub ];
+      };
+    <<flake_output_default>>
+  };
+}
+#+END_SRC
 
-#cat nixNote_.org
+***** flake 2
 
-#echo "emacs nixNote_.org"
-#echo "cat nixNote_.org"
+#+NAME: flake_2
+#+HEADER: :tangle ../flake-2_.nix
+#+HEADER: :noweb yes
+#+BEGIN_SRC nix
+{
+  description               = "a sisu like parser & document generator";
+  inputs.<<flake_inputs_nix>>
+  outputs = { <<flake_outputs>> }:
+    let
+      system = "x86_64-linux";
+      pkgs = import nixpkgs {
+        inherit system;
+      };
+      #lib = nixpkgs.lib;
+    in {
+      packages.x86_64-linux.spine = pkgs.stdenv.mkDerivation {
+        inherit system;
+        <<flake_metadata>>
+        inherit self;
+        src = self;
+        #shell = ./shell.nix;
+        shell = ./default.nix;
+        devEnv = ./devenv.nix;
+        <<flake_phases>>
+        buildInputs       = [ sqlite ];
+        nativeBuildInputs = with pkgs; [ dub <<d-compiler>> ]; # [ dub dmd ]; [ dub ldc ]; [ dub gdc ];
+      };
+      <<flake_output_default>>
+  };
+}
 #+END_SRC
 
-*** makefile
+***** flake (multi-system)
 
-#+HEADER: :tangle ../makefile_
-#+BEGIN_SRC make
-buildPhase:
-	HOME=$${PWD}; \
-	for DC_ in dmd ldmd2 gdmd; do \
-	  echo "- check for D compiler $${DC_}"; \
-	  DC=$$(type -P $${DC_} || echo ""); \
-	  if [ ! "$${DC}" == "" ]; then \
-	    break; \
-	  fi; \
-	done; \
-  echo "D compiler = $${DC}"; \
-	if [ "$${DC}" == "" ]; then \
-    echo "Error: could not find D compiler"; \
-	  exit 1; \
-	fi; \
-	echo "$${DC_} used as D compiler to build $${pname}"; \
-	export DFLAGS="-O2 -inline"; \
-	dub build --compiler=$${DC} --build=release --combined --skip-registry=all;
-checkPhase:
-	runHook preCheck; \
-	HOME=$${PWD}; \
-	dub test --combined --skip-registry=all; \
-	runHook postCheck
-installPhase:
-	runHook preInstall; \
-	mkdir -p $${out}/bin; \
-	install -m755 ./bin/spine $${out}/bin/spine; \
-	runHook postInstall
-	#cp -r bin/spine $out/bin/.
-postInstall:
-	echo "$${out}/share/cgi-bin"; \
-	echo `ls -la $${out}/bin/spine`
+#+NAME: flake_multi_system_possible
+#+HEADER: :tangle ../flake-0-multi-system_.nix
+#+HEADER: :noweb yes
+#+BEGIN_SRC nix
+{
+  description                 = "a sisu like parser & document generator";
+  inputs.<<flake_inputs_nix>>
+  outputs = { <<flake_outputs>> }:
+    let
+      version                 = "<<spine_version_set>>";
+      supportedSystems        = [ "x86_64-linux" ]; # [ "x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin"  ];
+      # helper function to generate an attrset '{ x86_64-linux = f "x86_64-linux"; ...  }'.
+      forAllSystems           = nixpkgs.lib.genAttrs supportedSystems;
+      nixpkgsFor              = forAllSystems (system: import nixpkgs { inherit system;  }); # nixpkgs instantiated for supported system types.
+      <<flake_devshells>>
+    in {
+      packages                = forAllSystems (system:
+        let
+          pkgs                = nixpkgsFor.${system};
+        in {
+          default             = pkgs.stdenv.mkDerivation {
+            pname             = "spine";
+            inherit version;
+            src               = self;
+            shell             = ./default.nix;
+            devEnv            = ./devenv.nix;
+            <<flake_phases>>
+            buildInputs       = [ sqlite ];
+            nativeBuildInputs = with pkgs; [ dub <<d-compiler>> ]; # [ dub dmd ]; [ dub ldc ]; [ dub gdc ];
+          };
+          #vendorSha256 = "sha256-0Q00000000000000000000000000000000000000000=";
+      });
+  };
+}
 #+END_SRC
 
 *** flake :flake:
+**** notes?
 
 - flake.nix
-    /nixpkgs-ra/nixpkgs
+    /srv/nix/nixpkgs
     ./shell.nix
   - shell.nix
       ./pkgs/shell-pkgs.nix
@@ -483,6 +282,7 @@ postInstall:
 - 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 develop --profile .#default --print-build-logs --command spine -v
 
 - nix search --json 2>/dev/null |jq
 - nix flake show
@@ -490,98 +290,214 @@ postInstall:
 
 # nix-instantiate | nix-build
 
-#+HEADER: :tangle ../flake.nix
-#+HEADER: :noweb yes
-#+BEGIN_SRC nix
-{
-  description = "a sisu like parser and document generator";
-  inputs.flake-utils.url = "github:numtide/flake-utils";
-  inputs.nixpkgs.url = "github:nixos/nixpkgs";
-  #inputs.nixpkgs.url = "/nixpkgs-ra/nixpkgs";
-  outputs = { self, nixpkgs, flake-utils }: {
-    packages.x86_64-linux.spine =
-      let
-        pkgs = import nixpkgs {
-          system = "x86_64-linux";
-        };
-        #targetOf = package: "${package.targetPath or "."}/${package.targetName or package.name}";
-      in pkgs.stdenv.mkDerivation {
-        pname       = "spine";
-        version     = "<<spine_version_set>>";
-        description = "a sisu like parser and document generator";
-        inherit self;
-        src = self;
-        shell = ./shell.nix;
-        buildPhase = ''
-          runHook preBuild
-          HOME="$PWD"
-          DFLAGS="-O2 -inline"
-          for DC_ in dmd ldmd2 gdmd; do
-            echo "- check for D compiler $DC_"
-            DC=$(type -P $DC_ || echo "")
-            if [ ! "$DC" == "" ]; then break; fi
-          done
-          if [ "$DC" == "" ]; then
-            exit "Error: could not find D compiler"
-          fi
-          echo "$DC_ used as D compiler to build $pname"
-          dub build --compiler=$DC --build=release --combined --skip-registry=all
-          runHook postBuild
-        '';
-        checkPhase = ''
-          runHook preCheck
-          HOME="$PWD"
-          dub test --combined --skip-registry=all
-          runHook postCheck
-        '';
-        installPhase = ''
-          runHook preInstall
-          mkdir -p $out/bin
-          install -m755 ./bin/spine $out/bin/spine
-          #cp -r bin/spine $out/bin/.
-          runHook postInstall
-        '';
-        postInstall = ''
-          echo `ls -la $out/bin/spine`
-          echo ""
-          echo "nix build or nix develop? (suggestions):"
-          echo '- nix build'
-          echo '  nix build .#spine --print-build-logs'
-          echo '    nix build --print-build-logs'
-          echo '- nix run'
-          echo '  nix run .#spine --print-build-logs'
-          echo '  nix run default.nix --print-build-logs'
-          echo '- nix shell'
-          echo '  nix shell --print-build-logs --command spine -v'
-          echo '- nix develop'
-          echo '  nix develop --build -f derivation.nix -I .envrc --print-build-logs'
-          echo '    nix develop ; eval "$buildPhase"'
-          echo 'spine -v'
-          echo 'nix-instantiate | nix show-derivation | jq'
-          echo `ls -la $out/bin/spine`
-          echo "built:"
-          $out/bin/spine -v
-        '';
-        nativeBuildInputs = with pkgs; [ ldc dub ];
-        buildInputs = with pkgs; [ sqlite ];
-     };
-     packages.x86_64-linux.default = self.packages.x86_64-linux.spine;
-  };
-}
-
 #nix flake update
 #nix flake check
 #nix flake show
 #nix develop
 #nix build .#default --print-build-logs
+
+#+BEGIN_SRC nix
+src = fetchTarball {
+  url       = "file:///[path]/$(pname)-$(version).tar.gz";
+  sha256    = "sha256:0000000000000000000000000000000000000000000000000000";
+};
+#+END_SRC
+
+**** flake parts
+***** flake metadata
+
+#+NAME: flake_metadata
+#+HEADER: :noweb yes
+#+BEGIN_SRC nix
+pname       = "spine";
+version     = "<<spine_version_set>>";
+description = "a sisu like parser and document generator";
+#+END_SRC
+
+***** flake inputs
+****** flake inputs static
+
+#+NAME: flake_inputs_nix
+#+HEADER: :noweb yes
+#+BEGIN_SRC nix
+nixpkgs.url          = "github:nixos/nixpkgs";
+flake-utils.url      = "github:numtide/flake-utils";
+#+END_SRC
+
+****** flake inputs for dub2nix
+
+#+NAME: flake_inputs_dub2nix
+#+HEADER: :noweb yes
+#+BEGIN_SRC nix
+flake-utils.url    = "github:numtide/flake-utils";
+nixpkgs.url        = "github:nixos/nixpkgs";
+d2sqlite3-src      = { url = "github:dlang-community/d2sqlite3"; flake = false; };
+tinyendian-src     = { url = "github:kiith-sa/tinyendian";       flake = false; };
+dyaml-src          = { url = "github:dlang-community/D-YAML";    flake = false; };
+imageformats-src   = { url = "github:lgvz/imageformats";         flake = false; };
+dub2nix-src        = { url = "github:lionello/dub2nix";          flake = false; };
+#+END_SRC
+
+***** flake outputs
+****** flake outputs static
+
+#+NAME: flake_outputs
+#+HEADER: :noweb yes
+#+BEGIN_SRC nix
+self, nixpkgs, flake-utils
+#+END_SRC
+
+****** flake outputs for dub2nix
+
+#+NAME: flake_outputs_dub2nix
+#+HEADER: :noweb yes
+#+BEGIN_SRC nix
+self, nixpkgs, flake-utils, dub2nix-src, d2sqlite3-src, tinyendian-src, dyaml-src, imageformats-src
+#+END_SRC
+
+***** flake devshells
+
+#+NAME: flake_devshells
+#+HEADER: :noweb yes
+#+BEGIN_SRC nix
+devShells               = forAllSystems (system:
+  let pkgs              = nixpkgsFor.${system};
+  in {
+    default = pkgs.mkShell {
+      buildInputs       = with pkgs; [ git dub dmd ldc sqlite ];
+    };
+});
+#+END_SRC
+
+***** flake phases
+
+#+NAME: flake_phases
+#+HEADER: :noweb yes
+#+BEGIN_SRC nix
+buildPhase = ''
+  runHook preBuild
+  HOME="$PWD"
+  for DC_ in dmd ldmd2 ldc2 gdc gdmd; do
+    echo "- check for D compiler $DC_"
+    DC=$(type -P $DC_ || echo "")
+    if [ ! "$DC" == "" ]; then break; fi
+  done
+  if [ "$DC" == "" ]; then exit "Error: could not find D compiler"; fi
+  echo "$DC_ used as D compiler to build $pname"
+  dub build --compiler=$DC --build=$DC_ --combined --skip-registry=all
+  runHook postBuild
+'';
+checkPhase = ''
+  runHook preCheck
+  HOME="$PWD"
+  dub test --combined --skip-registry=all
+  runHook postCheck
+'';
+installPhase = ''
+  runHook preInstall
+  mkdir -p $out/bin
+  install -m755 ./bin/spine $out/bin/spine
+  runHook postInstall
+'';
+postInstall = ''
+  echo `ls -la $out/bin/spine`
+  echo "
+  nix build or nix develop? (suggestions):
+  - nix build
+    nix build .#default --print-build-logs
+    nix flake update; nix build .#default --print-build-logs
+      nix build --print-build-logs
+  - nix run
+    nix run .#default --print-build-logs
+    nix run default.nix --print-build-logs
+  - nix shell
+    nix shell .#default --print-build-logs --command spine -v
+  - nix develop
+    nix develop --profile .#default --print-build-logs --command spine -v
+    nix develop ; eval \"$buildPhase\"
+    nix develop --build -f derivation.nix -I .envrc --print-build-logs
+  - nix profile install . --print-build-logs
+  spine -v
+  nix-instantiate | nix show-derivation | jq
+  "
+  $out/bin/spine -v
+'';
+#+END_SRC
+
+***** flake output default
+
+#+NAME: flake_output_default
+#+HEADER: :noweb yes
+#+BEGIN_SRC nix
+packages.x86_64-linux.default = self.packages.x86_64-linux.spine;
+#+END_SRC
+
+#+NAME: flake_output_spine
+#+HEADER: :noweb yes
+#+BEGIN_SRC nix
+packages.x86_64-linux.spine =
+  let
+    pkgs = import nixpkgs {
+      system = "x86_64-linux";
+    };
+    #targetOf = package: "${package.targetPath or "."}/${package.targetName or package.name}";
+  in pkgs.stdenv.mkDerivation {
+    <<flake_metadata>>
+    inherit self;
+    src = self;
+    #shell = ./shell.nix;
+    shell = ./default.nix;
+    devEnv = ./devenv.nix;
+    <<flake_phases>>
+    buildInputs       = [ sqlite ];
+    nativeBuildInputs = with pkgs; [ <<d-compiler>> dub ]; # [ dmd dub ]; [ ldc dub ]; [ gdc dub ];
+  };
+#+END_SRC
+
+***** d-compiler (dmd ldc gdc)
+
+- dmd ldc gdc
+
+#+NAME: d-compiler
+#+HEADER: :noweb yes
+#+BEGIN_SRC nix
+dmd
 #+END_SRC
 
+***** flake spine dub2nix
+
+#+NAME: flake_output_spine_dub2nix
+#+HEADER: :noweb yes
+#+BEGIN_SRC nix
+packages.x86_64-linux.spine =
+  let
+    pkgs            = import nixpkgs {
+      system        = "x86_64-linux";
+    };
+    #targetOf = package: "${package.targetPath or "."}/${package.targetName or package.name}";
+  in
+    pkgs.stdenv.mkDerivation {
+      pname         = "spine";
+      version       = "<<spine_version_set>>";
+      description   = "a sisu like parser and document generator";
+      inherit self;
+      src           = self;
+      shell         = ./shell.nix;
+      <<flake_phases>>
+      buildInputs       = [ sqlite ];
+      nativeBuildInputs = with pkgs; [ dub ldc ];
+    };
+#+END_SRC
+
+***** flake misc
+
 #+BEGIN_SRC nix
 src = fetchTarball {
   url       = "file:///[path]/$(pname)-$(version).tar.gz";
   sha256    = "sha256:0000000000000000000000000000000000000000000000000000";
 };
 #+END_SRC
+
 #+HEADER: :noweb yes
 #+BEGIN_SRC nix
 {
@@ -700,7 +616,7 @@ mkShell {
     # ### i18n translation related
     # perl534Packages.Po4a
     ### candy
-    starship
+    #starship
   ];
   shellHook = ''
     #if [[ -f ".envrc" ]]; then
@@ -730,7 +646,7 @@ mkShell {
         nix build .#default --print-build-logs |& nom
 
       - nix run
-        nix run .#spine --print-build-logs
+        nix run .#default --print-build-logs
         nix run default.nix --print-build-logs
 
       - nix shell
@@ -747,7 +663,7 @@ mkShell {
 
       nix-instantiate | nix show-derivation | jq
       nix-build . --no-out-link | xargs -o nix-tree
-      nix-tree --derivation .#spine
+      nix-tree --derivation .#default
 
     "
     #echo "ldc `${pkgs.ldc}/bin/ldc2 -v`"
@@ -765,19 +681,19 @@ mkShell {
 
 # [ nix-shell ]
 
-  # - nix-shell -I nixpkgs=/nixpkgs-ra/nixpkgs --pure
-  # - nix-shell -p "with import /nixpkgs-ra/nixpkgs {}; ldc" --pure
-  # - nix-shell -p "with import /nixpkgs-ra/nixpkgs {}; [dub ldc]" --pure
+  # - nix-shell -I nixpkgs=/srv/nix/nixpkgs --pure
+  # - nix-shell -p "with import /srv/nix/nixpkgs {}; ldc" --pure
+  # - nix-shell -p "with import /srv/nix/nixpkgs {}; [dub ldc]" --pure
 
   # - nix-shell -p nixVersions.unstable #nixFlakes
   # - nix-shell -p nixFlakes --pure
-  # - nix-shell -p nixFlakes --pure -p "with import /nixpkgs-ra/nixpkgs {}; [nix dub ldc git ps]"
+  # - nix-shell -p nixFlakes --pure -p "with import /srv/nix/nixpkgs {}; [nix dub ldc git ps]"
   # - nix-shell shell.nix direnv: export +IN_NIX_SHELL
   # - nix-shell shell.nix
 
 # [ nix-build ]
 
-  # - nix-build -I nixpkgs=/nixpkgs-ra/nixpkgs # --pure
+  # - nix-build -I nixpkgs=/srv/nix/nixpkgs # --pure
   # - nix-build -I .envrc --pure
   # - nix-build default.nix -I .envrc && result/bin/spine -v
 
@@ -805,18 +721,18 @@ mkShell {
   # - nix build `nix-instantiate -I .envrc`
 
   # - nix build -f default.nix && ./result/bin/spine -v && noti -t "spine build" -m "see ./result/bin/spine"
-  # - nix build .#spine
+  # - nix build .#default
 
 # [ nix run ]
 
   # - nix run default.nix --print-build-logs
   # - nix run -I .envrc default.nix --print-build-logs
-  # - nix run .#spine
+  # - nix run .#default
 
 # - nix-shell -I .envrc --pure
 # - nix develop --build -f derivation.nix -I .envrc --print-build-logs
 
-# - nix-shell -p nixFlakes --pure -p "with import /nixpkgs-ra/nixpkgs {}; [nix dub ldc git ps]"
+# - nix-shell -p nixFlakes --pure -p "with import /srv/nix/nixpkgs {}; [nix dub ldc git ps]"
 # - nix-build
 # - nix build `nix-instantiate -I .envrc`
 
@@ -838,13 +754,13 @@ mkShell {
 
 - nix-shell --pure -I nixpkgs=<<nixpkgs_local>>
 - nix-shell --pure -p "with import <<nixpkgs_local>> {}; ldc"
-- nix-shell --pure -p "with import /nixpkgs-ra/nixpkgs {}; [dub ldc]"
+- nix-shell --pure -p "with import /srv/nix/nixpkgs {}; [dub ldc]"
 
 - shell.nix direnv: export +IN_NIX_SHELL
 
 - nix-shell -p nixFlakes
 - nix-shell -p nixFlakes --pure
-- nix-shell -p nixFlakes --pure -p "with import /nixpkgs-ra/nixpkgs {}; [dub ldc]"
+- nix-shell -p nixFlakes --pure -p "with import /srv/nix/nixpkgs {}; [dub ldc]"
 
 - shell.nix -I .envrc
 - nix-shell -I nixpkgs=<provide local nix path>
@@ -877,7 +793,7 @@ mkShell {
   ./result/bin/spine
 #+END_SRC
 
-**** parts
+**** shell parts (packages)
 ***** packages nix related
 
 #+NAME: shell_packages_nix_related
@@ -971,32 +887,10 @@ foliate
 perl534Packages.Po4a
 #+END_SRC
 
-**** misc
-
-#+HEADER: :NO-tangle ../shell.nix
-#+HEADER: :tangle-mode (identity #o755)
-#+HEADER: :shebang "#!/usr/bin/env -S nix-shell"
-#+BEGIN_SRC nix
-{ pkgs ? import <nixpkgs> {} }:
-pkgs.mkShell {
-  buildInputs = with pkgs; [
-    (import ./nix/pkglst/shell-pkgs.nix { inherit pkgs; })
-  ];
-  buildPhase = "nix build -f default.nix";
-  shellHook = ''
-    echo "built spine @ ./result/bin/spine"
-    if [[ -f ".envrc" ]]; then
-      source .envrc
-    fi
-    nix-instantiate | nix show-derivation | jq
-  '';
-}
-#+END_SRC
-
 *** default.nix :default:
 
 - default.nix -I nixpkgs=<provide local nix path>
-  e.g. default.nix -I nixpkgs=/nixpkgs-ra/nixpkgs
+  e.g. default.nix -I nixpkgs=/srv/nix/nixpkgs
 
 - nix-build -I nixpkgs=<provide local nix path>
   e.g. nix-build -I nixpkgs=<<nixpkgs_local>>
@@ -1023,7 +917,80 @@ nix develop --build -f derivation.nix -I .envrc --print-build-logs
 #+HEADER: :shebang "#!/usr/bin/env -S nix-build"
 #+BEGIN_SRC nix
 { pkgs ? import <nixpkgs> {} }:
-pkgs.callPackage ./derivation.nix {}
+pkgs.callPackage ./devenv.nix {}
+#+END_SRC
+
+* devEnv
+
+nix profile install .
+
+#+HEADER: :tangle ../devenv.nix
+#+HEADER: :tangle-mode (identity #o644)
+#+HEADER: :noweb yes
+#+BEGIN_SRC nix
+# profile.nix
+{ pkgs ? import <nixpkgs> { }, name ? "user-env"  }: with pkgs;
+buildEnv {
+  inherit name;
+  extraOutputsToInstall = [ "out" "man" "lib"  ]; # to get all needed symlinks
+  paths = [
+    #nix # if not on NixOS, this is needed
+    direnv
+    nixVersions.unstable #nixFlakes
+    nix-prefetch-git
+    validatePkgConfig
+    nix-tree jq nix-output-monitor
+    git
+    ps
+    ### d_build_related
+    dub
+    ## compiler
+    dmd
+    ldc
+    #gdc
+    #rund
+    ## linker
+    #lld
+    #mold
+    ## builder
+    #ninja
+    #meson
+    ### sqlite search related
+    sqlite
+    # ### pdf_latex_related
+    # source-sans-pro
+    # source-serif-pro
+    # source-code-pro
+    # texlive.combined.scheme-full
+    # ### xml_and_epub_related
+    # libxml2
+    # html-tidy
+    # xmlstarlet
+    # epubcheck
+    # ebook_tools
+    # epr
+    # sigil
+    # calibre #(suite includes: ebook-viewer)
+    # foliate
+    # ### i18n translation related
+    # perl534Packages.Po4a
+    ### candy
+    #starship
+    # this will create a script that will rebuild and upgrade your setup; using shell script syntax
+    (writeScriptBin "nix-rebuild" ''
+      #!${stdenv.shell}
+      cd <path-to-flake> || exit 1
+      nix flake update
+      nix profile upgrade '.*'
+    '')
+    # puts in your root the nixpkgs version
+    (writeTextFile {
+      name = "nixpkgs-version";
+      destination = "/nixpkgs-version";
+      text = lib.version;
+    })
+  ];
+}
 #+END_SRC
 
 *** derivation.nix :default:
@@ -1119,7 +1086,7 @@ mkDubDerivation rec {
   meta = with pkgs.lib; {
     description = "A sisu like parser and document generator";
     longDescription = ''
-      A sisu like parser and document generator
+      a sisu like parser and document generator
     '';
     homepage    = "https://sisudoc.org";
     license     = licenses.agpl3Plus;
@@ -1370,7 +1337,7 @@ github:nixos/nixpkgs
 
 #+NAME: nixpkgs_path_local
 #+BEGIN_SRC nix
-/nixpkgs-ra/nixpkgs
+/srv/nix/nixpkgs
 #+END_SRC
 
 **** project path options
@@ -1452,3 +1419,329 @@ fc-query DejaVuSans.ttf | grep '^\s\+family:' | cut -d'"' -f2
 $XDG_DATA_HOME/fonts
 ~/.local/share/fonts
 #+END_SRC
+
+** NOTES
+*** nix-shell
+
+- default.nix
+
+#+BEGIN_SRC sh
+nix-shell
+nix-build
+#+END_SRC
+
+- project.nix
+
+#+BEGIN_SRC sh
+nix-shell
+nix-build project.nix
+#+END_SRC
+
+*** nix-shell --pure
+
+- default.nix
+
+#+HEADER: :noweb yes
+#+BEGIN_SRC sh
+nix-shell --pure
+nix-build -I nixpkgs=<<nixpkgs_local>>
+nix-build -I .envrc
+#+END_SRC
+
+#+BEGIN_SRC sh
+nix build -f default.nix --print-build-logs
+nix build -f derivation.nix --print-build-logs
+nix shell -f default.nix --print-build-logs
+# nix build -f project.nix
+# nix build -f spine.nix
+nix develop --build -f derivation.nix -I .envrc --print-build-logs
+nix develop --profile .#default --print-build-logs --command spine -v
+#+END_SRC
+
+*** derivation .drv
+
+#+BEGIN_SRC sh
+nix show-derivation /nix/store/q7n14bm8j5vzm62qaraczdb4bpyf59vv-spine-0.11.1.drv
+#+END_SRC
+
+**** .env/echo-nixNote CHECK MODIFY
+
+#+HEADER: :tangle ../.env/echo-nixNote
+#+BEGIN_SRC sh
+echo '-*- mode: org -*-
+
+,* nixpkgs path?
+
+  # eval "$(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" $SpineDOC/spine-markup-samples/markup/pod/*
+,#+END_SRC
+
+,*** sqlite db (shared) - drop db
+
+,#+BEGIN_SRC sh
+$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="<<spine_search_db>>" --sqlite-db-path="$SpineDBpath"
+$SpineBIN/spine -v --sqlite-db-recreate --sqlite-db-filename="<<spine_search_db>>" --sqlite-db-path="$SpineDBpath"
+,#+END_SRC
+
+,*** populate sqlite db
+
+,#+BEGIN_SRC sh
+$SpineBIN/spine -v --sqlite-update --sqlite-db-filename="<<spine_search_db>>" --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="<<spine_search_db>>" --cgi-sqlite-search-filename="<<spine_search_cgi>>" --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 ( $SpinePOD/.rc/config_local_site )
+output:
+  path:                        "/srv/www/spine"
+default:
+  language:                    "en"
+  papersize:                   "a4"
+  text_wrap:                   "80"
+  digest:                      "sha256"
+webserv:
+  http:                        "http"
+  domain:                      "localhost"
+  data_http:                   "http"
+  data_domain:                 "localhost"
+  data_root_url:               "https://sisudoc.org"
+  data_root_path:              "/srv/www/spine"
+  images_root_part:            "image"
+  cgi_search_form_title:       "≅ SiSU Spine search"
+  cgi_http:                    "https"
+  cgi_domain:                  "sisudoc.org"
+  cgi_bin_url:                 "http://sisudoc.org/cgi-bin"
+  cgi_bin_part:                "cgi-bin"
+  cgi_bin_path:                "/var/www/cgi/cgi-bin"
+  cgi_search_script:           "<<spine_search_cgi>>"
+  cgi_action:                  "https://sisudoc.org/spine_search"
+  db_sqlite_filename:          "<<spine_search_db>>"
+  db_sqlite_path:              "/var/www/sqlite"
+,#+END_SRC
+
+,*** make search form
+
+,#+BEGIN_SRC sh
+$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"
+#+END_SRC
+
+*** makefile
+
+#+HEADER: :tangle ../makefile_
+#+BEGIN_SRC make
+buildPhase:
+	HOME=$${PWD}; \
+	for DC_ in dmd ldmd2 gdmd; do \
+	  echo "- check for D compiler $${DC_}"; \
+	  DC=$$(type -P $${DC_} || echo ""); \
+	  if [ ! "$${DC}" == "" ]; then \
+	    break; \
+	  fi; \
+	done; \
+  echo "D compiler = $${DC}"; \
+	if [ "$${DC}" == "" ]; then \
+    echo "Error: could not find D compiler"; \
+	  exit 1; \
+	fi; \
+	echo "$${DC_} used as D compiler to build $${pname}"; \
+	export DFLAGS="-O2 -inline"; \
+	dub build --compiler=$${DC} --build=release --combined --skip-registry=all;
+checkPhase:
+	runHook preCheck; \
+	HOME=$${PWD}; \
+	dub test --combined --skip-registry=all; \
+	runHook postCheck
+installPhase:
+	runHook preInstall; \
+	mkdir -p $${out}/bin; \
+	install -m755 ./bin/spine $${out}/bin/spine; \
+	runHook postInstall
+	#cp -r bin/spine $out/bin/.
+postInstall:
+	echo "$${out}/share/cgi-bin"; \
+	echo `ls -la $${out}/bin/spine`
+#+END_SRC
diff --git a/shell.nix b/shell.nix
index 8a19e80..c31d0a6 100755
--- a/shell.nix
+++ b/shell.nix
@@ -42,7 +42,7 @@ mkShell {
     # ### i18n translation related
     # perl534Packages.Po4a
     ### candy
-    starship
+    #starship
   ];
   shellHook = ''
     #if [[ -f ".envrc" ]]; then
@@ -72,7 +72,7 @@ mkShell {
         nix build .#default --print-build-logs |& nom
 
       - nix run
-        nix run .#spine --print-build-logs
+        nix run .#default --print-build-logs
         nix run default.nix --print-build-logs
 
       - nix shell
@@ -89,7 +89,7 @@ mkShell {
 
       nix-instantiate | nix show-derivation | jq
       nix-build . --no-out-link | xargs -o nix-tree
-      nix-tree --derivation .#spine
+      nix-tree --derivation .#default
 
     "
     #echo "ldc `${pkgs.ldc}/bin/ldc2 -v`"
diff --git a/test.nix b/test.nix
new file mode 100644
index 0000000..bd1e469
--- /dev/null
+++ b/test.nix
@@ -0,0 +1,10 @@
+# This file was generated by https://github.com/lionello/dub2nix v0.3.0
+
+{ pkgs ? import <nixpkgs> {} }:
+with import ./mkDub.nix { inherit pkgs; };
+
+mkDubDerivation {
+    src = ./.;
+    # version = "0.0.1";
+    # buildInputs = [ add any runtime deps here ];
+}