auto commit on build

hosts/crayon/git.nix
overlays/ttpre.nix

hosts/crayon/git.nix

@@ -1,4 +1,4 @@
-{ config, ... }:
+{ config, pkgs, ... }:
 let
   cfg = config.services.forgejo;
   srv = cfg.settings.server;
@@ -12,6 +12,10 @@ in {
     locations."/".proxyPass = "http://localhost:${toString srv.HTTP_PORT}";
   };
 
+  users.users.${cfg.user}.packages = with pkgs; [
+    mandoc
+    ttpre
+  ];
   services.forgejo = {
     enable = true;
     database.type = "postgres";
@@ -31,6 +35,14 @@ in {
         DEFAULT_PUSH_CREATE_PRIVATE = false;
         ENABLE_PUSH_CREATE_USER = true;
       };
+      "markup.mandoc" = {
+        ENABLED = true;
+        FILE_EXTENSIONS = ".1,.2,.3,.4,.5,.6,.7,.8,.9";
+        RENDER_COMMAND = pkgs.writeShellScriptBin "mandoc-ttpre" ''
+          ${pkgs.mandoc}/bin/mandoc -O fragment -Tutf8 -Kutf-8 "$1" | ${pkgs.ttpre}/bin/ttpre
+          '' + "/bin/mandoc-ttpre";
+        IS_INPUT_FILE = true;
+      };
     };
   };
 }

overlays/ttpre.nix

@@ -0,0 +1,29 @@
+{ unstable }:
+final: prev: {
+  ttpre = prev.stdenv.mkDerivation {
+    pname = "ttpre";
+    version = "1.0";
+
+    src = prev.fetchurl {
+      url = "https://git.causal.agency/src/plain/bin/ttpre.c?id=7d87749a623ef4f1274903f91ebaf90dcd1cc9b5";
+      name = "ttpre.c";
+      sha256 = "sha256-K0S12UBBvEdNHOF+O63gw0PCtYkxxWesxnpRg9iSDmk=";
+    };
+    nativeBuildInputs = [ prev.gcc ];
+    unpackPhase = ":"; # we don't need to unpack it's just a c file
+    buildPhase = "gcc -o ttpre $src";
+    installPhase = ''
+      mkdir -p $out/bin
+      mv ttpre $out/bin
+      '';
+
+
+    meta = {
+      description = "Wrap a file in <pre> tags";
+      license = "AGPLv3";
+      homepage = "https://git.causal.agency/src/";
+      mainProgram = "ttpre";
+      maintainers = [ "squibid" ];
+    };
+  };
+}