Initial nix ad-hoc package installation

flake.nix

@@ -10,32 +10,27 @@
     args = {
       inherit pkgs;
       piston = {
-        mkRuntime = {
-            language,
-            version,
-            runtime? null,
-            run,
-            compile? null,
-            packages? null,
-            aliases? [],
-            limitOverrides? {},
-            tests
-        }: let
-          compileFile = if compile != null then
-            pkgs.writeShellScript "compile" compile
+        mkRuntime = builderFn: let
+          languagePackagesFn = packages: with packages; [ ];
+          buildRes = builderFn languagePackagesFn;
+          compileFile = if builtins.hasAttr "compile" buildRes then
+            pkgs.writeShellScript "compile" buildRes.compile
             else null;
-          runFile = pkgs.writeShellScript "run" run;
+          runFile = pkgs.writeShellScript "run" buildRes.run;
           metadata = {
-            inherit language version runtime aliases limitOverrides;
+            language = buildRes.language;
+            version = buildRes.version;
+            runtime = buildRes.runtime or null;
+            aliases = buildRes.aliases or [];
+            limitOverrides = buildRes.limitOverrides or {};
             run = runFile;
             compile = compileFile;
-            packageSupport = packages != null;
           };
+          tests = if (builtins.length buildRes.tests) > 0 then
+            buildRes.tests
+            else abort "Language ${buildRes.language} doesn't provide any tests";
         in {
-          inherit packages metadata;
-          tests = if (builtins.length tests) > 0 then
-            tests
-            else abort "Language ${language} doesn't provide any tests";
+          inherit metadata tests;
         };
         mkTest = {
           files,

piston

@@ -94,7 +94,7 @@ case "$SUBCOMMAND" in
             -e PISTON_RUNTIME_SET=$runtime_set \
             -v "$SCRIPT_DIR":/piston/src \
             -v $DEV_VOLUME_NAME:/nix \
-            -d "$IMAGE_NAME_DEV:$IMAGE_TAG" \
+            "$IMAGE_NAME_DEV:$IMAGE_TAG" \
             bash -c "cd /piston/src/api && yarn run dev"
         ;;
 

runtimes/python3.nix

@@ -1,27 +1,24 @@
-{pkgs, piston, ...}:
-let
-    pkg = pkgs.python3;
-in piston.mkRuntime {
+{ pkgs, piston, ... }:
+let basePkg = pkgs.python3;
+in piston.mkRuntime (libraries:
+  let pkg = basePkg.withPackages libraries;
+  in {
     language = "python3";
-    version = pkg.version;
+    version = basePkg.version;
 
-    aliases = [
-        "py3"
-        "py"
-        "python"
-    ];
+    aliases = [ "py3" "py" "python" ];
 
     run = ''
-    ${pkg}/bin/python3 "$@"
+      ${pkg}/bin/python3 "$@"
     '';
 
     tests = [
-        (piston.mkTest {
-            files = {
-                "test.py" = ''
-                    print("OK")
-                '';
-            };
-        })
+      (piston.mkTest {
+        files = {
+          "test.py" = ''
+            print("OK")
+          '';
+        };
+      })
     ];
-}
+  })