feat: improve dev-components with --extra

features/dev.nix

@@ -9,16 +9,16 @@
         pkgs.git
         packages.git-linearize
         packages.ggman
+
         pkgs.python3
-        pkgs.mdbook
-        pkgs.marksman
-        pkgs.mdformat
+        pkgs.osc
+
         pkgs.google-cloud-sdk
         pkgs.google-cloud-sql-proxy
+
         packages.ahab
         pkgs.just
         pkgs.presenterm
-        pkgs.osc
       ];
 
     };

features/direnv/use_dev.sh

@@ -1,16 +1,28 @@
 # shellcheck shell=bash
 # composable nix devshell from matej.nix
-# usage in .envrc: use dev uv_14 pg_18
+# usage in .envrc: use dev uv_14 pg_18 --extra cairo pkg-config
 
 # generates a flake and delegates to use_flake at the calling scope
 use_dev() {
-	local nix_list=""
+	local nix_list="" extra_list="" in_extra=0
 	for c in "$@"; do
-		if [[ ! "$c" =~ ^[a-zA-Z_][a-zA-Z0-9_]*$ ]]; then
-			log_error "use_dev: invalid component name: $c"
-			return 1
+		if [[ "$c" == "--extra" ]]; then
+			in_extra=1
+			continue
+		fi
+		if [[ $in_extra -eq 1 ]]; then
+			if [[ ! "$c" =~ ^[a-zA-Z_][a-zA-Z0-9_-]*$ ]]; then
+				log_error "use_dev: invalid package name: $c"
+				return 1
+			fi
+			extra_list="$extra_list pkgs.$c"
+		else
+			if [[ ! "$c" =~ ^[a-zA-Z_][a-zA-Z0-9_]*$ ]]; then
+				log_error "use_dev: invalid component name: $c"
+				return 1
+			fi
+			nix_list="$nix_list \"$c\""
 		fi
-		nix_list="$nix_list \"$c\""
 	done
 
 	local system
@@ -64,7 +76,7 @@ use_dev() {
       pkgs = nixpkgs.legacyPackages.\${system};
       devLib = import "\${dev}/flake/dev-components.nix" { inherit pkgs; lib = nixpkgs.lib; };
     in {
-      devShells.\${system}.default = devLib.mkComponentShell [$nix_list ];
+      devShells.\${system}.default = devLib.mkComponentShell [$nix_list ] [${extra_list} ];
     };
 }
 DEVFLAKE

flake/dev-components.nix

@@ -8,6 +8,7 @@ let
     pkgs.zlib
     pkgs.openssl
     pkgs.curl
+    pkgs.libffi
   ];
 
   mkNode = nodejs: {
@@ -24,12 +25,12 @@ let
     packages = [
       python
       pkgs.uv
+      pkgs.pkg-config
     ];
     libraries = pythonLibraries;
     env = {
       UV_PYTHON_DOWNLOADS = "never";
       UV_PYTHON_PREFERENCE = "only-system";
-      UV_PYTHON = "${python}/bin/python";
     };
     shellHook = ''
       unset PYTHONPATH
@@ -44,27 +45,10 @@ let
     uv_13 = mkUv pkgs.python313;
     uv_14 = mkUv pkgs.python314;
 
-    pg_15 = {
-      packages = [ pkgs.postgresql_15 ];
-    };
-    pg_16 = {
-      packages = [ pkgs.postgresql_16 ];
-    };
-    pg_17 = {
-      packages = [ pkgs.postgresql_17 ];
-    };
-    pg_18 = {
-      packages = [ pkgs.postgresql_18 ];
-    };
-
     node_20 = mkNode pkgs.nodejs_20;
     node_22 = mkNode pkgs.nodejs_22;
     node_24 = mkNode pkgs.nodejs_24;
 
-    go = {
-      packages = [ pkgs.go ];
-    };
-
     rust = {
       packages = [
         pkgs.rustc
@@ -75,20 +59,14 @@ let
       ];
     };
 
-    cmake = {
-      packages = [
-        pkgs.cmake
-        pkgs.ninja
-      ];
-    };
   };
 
   # build a single mkShell from one or more component names
   mkComponentShell =
-    names:
+    names: extraPackages:
     let
       selected = map (n: components.${n}) names;
-      allPackages = lib.concatMap (c: c.packages or [ ]) selected;
+      allPackages = lib.concatMap (c: c.packages or [ ]) selected ++ extraPackages;
       allLibraries = lib.concatMap (c: c.libraries or [ ]) selected;
       allHooks = lib.concatMapStrings (c: c.shellHook or "") selected;
       allEnvs = lib.foldl' (acc: c: acc // (c.env or { })) { } selected;