Docker basado en un sh en vez de en compose

.gitignore

@@ -1,5 +1,6 @@
 # https://dart.dev/guides/libraries/private-files
 # Created by `dart pub`
+.flutter-plugins-dependencies
 .dart_tool/
 .dart-tool/
 .dartServer/
@@ -12,7 +13,7 @@
 .zcompdump
 .zshrc
 .idea
-/d4rt-formulas.iml
 /build/
 /d4rt_formulas.iml
 .aider*
+.build-container-cache

Makefile

@@ -1,22 +1,20 @@
 
-flutter-container-exec = podman-compose run --entrypoint "$(1)"  flutter
-
 all: clean-podman build-linux-debug-podman build-linux-debug-podman
 
 build-podman:
-	podman-compose build
+	./docker-exec.sh build
 
 clean-podman: build-podman
-	$(call flutter-container-exec, flutter clean)
+	./docker-exec.sh exec flutter clean
 
 pub-get-podman: build-podman
-	$(call flutter-container-exec, flutter pub get)
+	./docker-exec.sh exec flutter pub get
 
 build-android-release-podman: pub-get-podman
-	$(call flutter-container-exec, flutter build apk --release)
+	./docker-exec.sh exec flutter build apk --release
 
 build-linux-debug-podman: pub-get-podman
-	$(call flutter-container-exec, flutter build linux --debug)
+	./docker-exec.sh exec flutter build linux --debug
 
 run-linux-debug: build-linux-debug-podman
 	build/linux/x64/debug/bundle/d4rt_formulas

aider.sh

@@ -1,2 +0,0 @@
-aider --git --watch-files --read CLAUDE.md --notifications --no-auto-commits
-

assets/formulas/formulas.d4rt

@@ -149,4 +149,28 @@ Where:
     """,
     "tags": ["medical", "pediatrics", "assessment"]
   }
+  ,
+  {
+    "name": "Compare price per mass",
+    "description": "Compares two products by their price per mass and returns which is cheaper.",
+    "input": [
+      {"name": "price1", "unit": "scalar"},
+      {"name": "mass1", "unit": "kilogram"},
+      {"name": "price2", "unit": "scalar"},
+      {"name": "mass2", "unit": "kilogram"}
+    ],
+    "output": {"name": "Result", "unit": "scalar"},
+    "d4rtCode": """
+      var p1 = price1 / mass1;
+      var p2 = price2 / mass2;
+      if (p1 < p2) {
+        Result = 'first product is cheaper';
+      } else if (p2 < p1) {
+        Result = 'second product is cheaper';
+      } else {
+        Result = 'both products have the same price per mass';
+      }
+    """,
+    "tags": ["comparison", "shopping", "economics"]
+  }
 ]

docker-exec.sh

@@ -0,0 +1,40 @@
+#!/bin/bash
+
+set -e
+
+DOCKER=podman
+
+
+build_image(){
+  $DOCKER build -t d4rt-formulas-builder -f Dockerfile .
+}
+
+exec_in_container(){
+
+  local XOPTIONS="--env DISPLAY=$DISPLAY --volume /tmp/.X11-unix:/tmp/.X11-unix --security-opt=label=disable"
+  local WOPTIONS="--env=XDG_RUNTIME_DIR=/run/user/$(id -u) --volume=/run/user/$(id -u)/wayland:/run/user/$(id -u)/wayland --group-add=video"
+  local SPIOPTIONS="--env AT_SPI_BUS=/run/user/$(id -u)/at-spi/bus_0 --volume=/run/user/$(id -u)/at-spi:/run/user/$(id -u)/at-spi  --device=/dev/dri"
+
+  $DOCKER run \
+    --rm \
+    $XOPTIONS \
+    $SPIOPTIONS \
+    -v ./.build-container-cache:/cache:z \
+    -v .:/app:z \
+    -e FLUTTER_FLAVOR=prod \
+    d4rt-formulas-builder \
+    "$@"
+}
+
+if [ "$1" = "build" ]; then
+  build_image
+  exit $?
+fi
+
+if [ "$1" = "exec" ]; then
+  exec_in_container ${@:2}
+  exit $?
+fi
+
+echo "Usage: $0 {build|exec <command>}"
+exit 1

lib/ai/formula_screen.dart

@@ -27,6 +27,9 @@ class D4rtEditingController extends TextEditingController {
   bool validate() {
     try {
       _lastValue = null;
+      if( text.trim().isEmpty ){
+        return true;
+      }
       _lastValue = FormulaEvaluator.evaluateExpression(text);
       _lastError = null;
       return true;
@@ -141,7 +144,7 @@ class _FormulaScreenState extends State<FormulaScreen> {
 
       // Convert output to selected unit if needed
       String? unit = widget.formula.output.unit;
-      if (unit != null) {
+      if (unit != null && unit is Number) {
         final converted = widget.corpus.convert(result, unit, _selectedOutputUnit!);
         if (converted is num) {
           _result = converted.toStringAsFixed(2);

lib/corpus.dart

@@ -35,7 +35,7 @@ class Corpus{
       if( checkUnits ){
         for( final inputVar in formula.input + [formula.output] ){
           if( inputVar.unit != null && !_allUnits.containsKey(inputVar.unit) ){
-            throw ArgumentError( "Unit not found: ${inputVar.unit}");
+            throw ArgumentError( "Unit not found in formula ${formula.name}: ${inputVar.unit}");
           }
         }
       }

lib/formula_evaluator.dart

@@ -168,13 +168,38 @@ class FormulaEvaluator {
         """);
       }
     }
+    // Build a Map<String, List<String>> named `variableValues` that exposes allowed values
+    // for each VariableSpec (inputs and output) to the interpreted code. Values are
+    // converted to strings and quoted in the produced d4rt source.
+    final variableValuesMap = <String, List<String>>{};
+
+    // Include input VariableSpecs when they have allowed values
+    for (final vs in formula.input) {
+      final values = vs.values;
+      if (values != null && values.isNotEmpty) {
+        variableValuesMap[vs.name] = values.map((v) => v.toString()).toList(growable: false);
+      }
+    }
+    // Explicitly include the output VariableSpec if it has allowed values
+    final outValues = formula.output.values;
+    if (outValues != null && outValues.isNotEmpty) {
+      variableValuesMap[formula.output.name] = outValues.map((v) => v.toString()).toList(growable: false);
+    }
+
+    // Write the variableValues map into the generated source without escaping names/values
+    buffer.writeln("final variableValues = {");
+    variableValuesMap.forEach((name, list) {
+      final listLiteral = list.map((s) => '"' + s + '"').join(', ');
+      buffer.writeln('  "' + name + '": [' + listLiteral + '],');
+    });
+    buffer.writeln('};');
+
     buffer.writeln("""
       late var ${formula.output.name};
       ${formula.d4rtCode}
       return ${formula.output.name};
       }
-      """
+      """);
-    );
 
      return buffer.toString();
    }

pubspec.lock

@@ -702,5 +702,5 @@ packages:
     source: hosted
     version: "3.1.3"
 sdks:
-  dart: ">=3.10.7 <4.0.0"
+  dart: ">=3.10.4 <4.0.0"
   flutter: ">=3.38.0"

pubspec.yaml

@@ -19,7 +19,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 version: 1.0.0+1
 
 environment:
-  sdk: ^3.10.7
+  sdk: ^3.10.4
 
 # Dependencies specify other packages that your package needs in order to work.
 # To automatically upgrade your package dependencies to the latest versions