feat: modules

overlay/default.nix

@@ -0,0 +1,79 @@
+{ inputs, self, nixpkgs, ... }: let
+  lib = nixpkgs.lib;
+in final: prev: (
+  let
+    hectic-packages = self.packages.${prev.system};
+  in {
+    hectic = hectic-packages;
+    postgresql_17 = prev.postgresql_17 // {pkgs = prev.postgresql_17.pkgs // {
+      http = hectic-packages.pg-17-ext-http;
+      pg_smtp_client = hectic-packages.pg-17-ext-smtp-client;
+      plhaskell = hectic-packages.pg-17-ext-plhaskell;
+      plsh = hectic-packages.pg-17-ext-plsh;
+      hemar = hectic-packages.pg-17-ext-hemar;
+    };};
+    postgresql_16 = prev.postgresql_16 // {pkgs = prev.postgresql_16.pkgs // {
+      http = hectic-packages.pg-16-ext-http;
+      pg_smtp_client = hectic-packages.pg-16-ext-smtp-client;
+      plhaskell = hectic-packages.pg-16-ext-plhaskell;
+      plsh = hectic-packages.pg-16-ext-plsh;
+      hemar = hectic-packages.pg-16-ext-hemar;
+    };};
+    postgresql_15 = prev.postgresql_15 // {pkgs = prev.postgresql_15.pkgs // {
+      http = hectic-packages.pg-15-ext-http;
+      pg_smtp_client = hectic-packages.pg-15-ext-smtp-client;
+      plhaskell = hectic-packages.pg-15-ext-plhaskell;
+      plsh = hectic-packages.pg-15-ext-plsh;
+      hemar = hectic-packages.pg-15-ext-hemar;
+    };};
+    writers = let
+      writeC = name: argsOrScript:
+        if lib.isAttrs argsOrScript && !lib.isDerivation argsOrScript
+        then
+          prev.writers.makeBinWriter (
+            argsOrScript
+            // {
+              compileScript = ''
+                # Force gcc to treat the input file as C code
+                ${prev.gcc}/bin/gcc -fsyntax-only -xc $contentPath
+                if [ $? -ne 0 ]; then
+                  echo "Syntax check failed"
+                  exit 1
+                fi
+                ${prev.gcc}/bin/gcc -xc -o $out $contentPath
+              '';
+            }
+          )
+          name
+        else
+          prev.writers.makeBinWriter {
+            compileScript = ''
+              # Force gcc to treat the input file as C code
+              ${prev.gcc}/bin/gcc -fsyntax-only -xc $contentPath
+              if [ $? -ne 0 ]; then
+                echo "Syntax check failed"
+                exit 1
+              fi
+              ${prev.gcc}/bin/gcc -xc -o $out $contentPath
+            '';
+          }
+          name
+          argsOrScript;
+      writeMinC = name: includes: body:
+        writeC name ''
+          ${builtins.concatStringsSep "\n" (map (h: "#include " + h) includes)}
+
+          int main(int argc, char *argv[]) {
+              ${body}
+          }
+        '';
+    in
+      prev.writers
+      // {
+        writeCBin = name: writeC "/bin/${name}";
+        writeC = writeC;
+        writeMinCBin = name: includes: body: writeMinC "/bin/${name}" includes body;
+        writeMinC = writeMinC;
+      };
+  }
+)