From a777982b17ca555cb2a33e5828f8dc9cca302430 Mon Sep 17 00:00:00 2001
From: Minijackson <minijackson@riseup.net>
Date: Thu, 4 Nov 2021 10:45:06 +0100
Subject: factorize build instructions

---
 beamer/flake.nix | 116 +++++--------------------------------------------------
 flake.nix        |  18 ++++++++-
 latex.nix        |  73 ++++++++++++++++++++++++++++++++++
 overlay.nix      |  54 ++++++++++++++++++++++++++
 4 files changed, 153 insertions(+), 108 deletions(-)
 create mode 100644 latex.nix
 create mode 100644 overlay.nix

diff --git a/beamer/flake.nix b/beamer/flake.nix
index d5e1614..b2c472e 100644
--- a/beamer/flake.nix
+++ b/beamer/flake.nix
@@ -2,115 +2,19 @@
   description = "My epic presentation";
 
   inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
-  inputs.beamertheme-metropolis = {
-    url = "github:matze/mtheme";
-    flake = false;
-  };
-  inputs.draculaTheme = {
-    url = "github:dracula/pygments";
-    flake = false;
-  };
-  inputs.pandoc-templates = {
-    url = "github:minijackson/pandoc-templates";
-    flake = false;
-  };
+  inputs.pandoc-nix-templates.url = "github:minijackson/pandoc-nix-templates";
 
-  outputs = { self, nixpkgs, beamertheme-metropolis, draculaTheme, pandoc-templates, }:
+  outputs = { self, nixpkgs, pandoc-nix-templates, }:
     let
-      pkgs = nixpkgs.legacyPackages.x86_64-linux;
+      pkgs = import nixpkgs {
+        system = "x86_64-linux";
+        overlays = [ pandoc-nix-templates.overlay ];
+      };
     in
     {
-
-      packages.x86_64-linux.pygments = pkgs.python3Packages.pygments.overrideAttrs (oldAttrs: {
-        postPatch = ''
-          cp ${draculaTheme}/dracula.py pygments/styles/
-          sed -i 's/bg:.\+ //' pygments/styles/inkpot.py
-        '';
-      });
-
-      defaultPackage.x86_64-linux =
-        let
-          beamertheme-metropolis' = pkgs.stdenvNoCC.mkDerivation {
-            pname = "texlive-beamertheme-metropolis";
-            version = "${builtins.substring 0 8 beamertheme-metropolis.lastModifiedDate}-${beamertheme-metropolis.shortRev or "dirty"}";
-
-            src = beamertheme-metropolis;
-
-            outputs = [ "out" "doc" ];
-
-            nativeBuildInputs = with pkgs; [
-              (texlive.combine {
-                inherit (texlive)
-                  scheme-small
-                  enumitem
-                  fileinfo
-                  latexmk;
-              })
-            ];
-
-            passthru = {
-              pname = "beamertheme-metropolis";
-              tlType = "run";
-            };
-
-            DESTDIR = placeholder "out";
-
-            dontConfigure = true;
-          };
-        in
-        pkgs.runCommand "slides"
-          {
-            src = ./.;
-            nativeBuildInputs = with pkgs; [
-              pandoc
-              self.packages.x86_64-linux.pygments
-              fira-code
-              which
-              (texlive.combine {
-                inherit (texlive)
-                  scheme-medium
-                  latexmk
-
-                  beamercolorthemeowl
-
-                  # For framed code listings
-                  tcolorbox environ
-
-                  # Optional pandoc dependencies
-                  microtype upquote parskip xurl bookmark footnotehyper
-
-                  # Some dependencies
-                  fvextra pgfopts minted catchfile xstring framed;
-                beamertheme-metropolis = { pkgs = [ beamertheme-metropolis' ]; };
-              })
-            ];
-
-            FONTCONFIG_FILE = pkgs.makeFontsConf {
-              fontDirectories = with pkgs; [ lmodern freefont_ttf fira fira-code ];
-            };
-          } ''
-          unpackFile $src
-          cd */
-          chmod -R u+w .
-
-          pandoc slides.md -t beamer -so slides.tex  \
-            --template=${pandoc-templates}/default.latex \
-            --lua-filter=${pkgs.pandoc-lua-filters}/share/pandoc/filters/minted.lua \
-            --pdf-engine=xelatex \
-            --pdf-engine-opt=-aux-directory=./build \
-            --pdf-engine-opt=-shell-escape
-
-          latexmk \
-            -shell-escape \
-            -xelatex \
-            -8bit \
-            -interaction=nonstopmode \
-            -verbose \
-            -file-line-error \
-            -output-directory=./build slides
-
-          cp build/slides.pdf $out
-        '';
-      # TODO: diagram-generator?
+      defaultPackage.x86_64-linux = pkgs.mkPandocBeamerPdf {
+        name = "slides";
+        src = ./.;
+      };
     };
 }
diff --git a/flake.nix b/flake.nix
index ca5e3a4..f5ed111 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,7 +1,22 @@
 {
   description = "My templates for making things with pandoc";
 
-  outputs = { self, nixpkgs }: {
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  inputs.beamertheme-metropolis = {
+    url = "github:matze/mtheme";
+    flake = false;
+  };
+  inputs.draculaTheme = {
+    url = "github:dracula/pygments";
+    flake = false;
+  };
+  inputs.pandoc-templates = {
+    url = "github:minijackson/pandoc-templates";
+    flake = false;
+  };
+
+  outputs = inputs @ { self, nixpkgs, beamertheme-metropolis, draculaTheme, pandoc-templates, }: {
+    overlay = import ./overlay.nix inputs;
 
     templates = {
       beamer = {
@@ -11,6 +26,5 @@
     };
 
     defaultTemplate = self.templates.beamer;
-
   };
 }
diff --git a/latex.nix b/latex.nix
new file mode 100644
index 0000000..7c0de49
--- /dev/null
+++ b/latex.nix
@@ -0,0 +1,73 @@
+{ runCommand
+, makeFontsConf
+, fira
+, fira-code
+, freefont_ttf
+, lmodern
+, pandoc
+, pandoc-lua-filters
+, pandoc-templates
+, pygments
+, texlive
+, which
+, documentType ? "latex"
+}:
+
+{ name, src }:
+
+runCommand name
+{
+  inherit src;
+
+  nativeBuildInputs = [
+    pandoc
+    pygments
+    fira-code
+    which
+    (texlive.combine {
+      inherit (texlive)
+        scheme-medium
+        latexmk
+
+        beamertheme-metropolis
+        beamercolorthemeowl
+
+        # For framed code listings
+        tcolorbox environ
+
+        # Optional pandoc dependencies
+        microtype upquote parskip xurl bookmark footnotehyper
+
+        # Some dependencies
+        fvextra pgfopts minted catchfile xstring framed;
+    })
+  ];
+
+  FONTCONFIG_FILE = makeFontsConf {
+    fontDirectories = [ lmodern freefont_ttf fira fira-code ];
+  };
+} ''
+  unpackFile $src
+  cd */
+  chmod -R u+w .
+
+  pandoc ${name}.md -t ${documentType} -so document.tex  \
+    --template=${pandoc-templates}/default.latex \
+    --lua-filter=${pandoc-lua-filters}/share/pandoc/filters/minted.lua \
+    --pdf-engine=xelatex \
+    --pdf-engine-opt=-aux-directory=./build \
+    --pdf-engine-opt=-shell-escape
+
+  latexmk \
+    -shell-escape \
+    -xelatex \
+    -8bit \
+    -interaction=nonstopmode \
+    -verbose \
+    -file-line-error \
+    -output-directory=./build document.tex
+
+  cp build/document.pdf $out
+''
+
+# TODO: diagram-generator?
diff --git a/overlay.nix b/overlay.nix
new file mode 100644
index 0000000..dc129f4
--- /dev/null
+++ b/overlay.nix
@@ -0,0 +1,54 @@
+inputs:
+
+final: prev:
+
+{
+  inherit (inputs) pandoc-templates;
+
+  pygments = prev.python3Packages.pygments.overrideAttrs (oldAttrs: {
+    postPatch = ''
+      cp ${inputs.draculaTheme}/dracula.py pygments/styles/
+      sed -i 's/bg:.\+ //' pygments/styles/inkpot.py
+    '';
+  });
+
+  texlive = (prev.texlive or { }) // {
+    beamertheme-metropolis =
+      let
+        date = builtins.substring 0 8 inputs.beamertheme-metropolis.lastModifiedDate;
+        shortRev = inputs.beamertheme-metropolis.shortRev or "dirty";
+
+        pkg = final.stdenvNoCC.mkDerivation {
+          pname = "texlive-beamertheme-metropolis";
+          version = "${date}-${shortRev}";
+
+          src = inputs.beamertheme-metropolis;
+
+          outputs = [ "out" "doc" ];
+
+          nativeBuildInputs = [
+            (final.texlive.combine {
+              inherit (final.texlive)
+                scheme-small
+                enumitem
+                fileinfo
+                latexmk;
+            })
+          ];
+
+          passthru = {
+            pname = "beamertheme-metropolis";
+            tlType = "run";
+          };
+
+          DESTDIR = placeholder "out";
+
+          dontConfigure = true;
+        };
+      in
+      { pkgs = [ pkg ]; };
+  };
+
+  mkPandocPdf = final.callPackage ./latex.nix { };
+  mkPandocBeamerPdf = final.callPackage ./latex.nix { documentType = "beamer"; };
+}
-- 
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