Accept '1' as a truthy value for boolean parameters (#186)

Fixes #185

CHANGELOG.md

@@ -1,6 +1,7 @@
 # Build Parameters Gradle plugin - Changelog
 
 ## Version 1.4.4
+* [New] [#185](https://github.com/gradlex-org/build-parameters/issues/185) String '1' is accepted as a truthy value for boolean parameters.
 * [Fixed] [#88](https://github.com/gradlex-org/build-parameters/issues/88) Example for boolean parameters with default false should be setting it to true. Thanks to @timyates.
 
 ## Version 1.4.3

src/docs/asciidoc/index.adoc

@@ -164,8 +164,9 @@ include::{samples-path}/defining-parameters/kotlin/gradle/plugins/build-paramete
 include::{samples-path}/defining-parameters/groovy/gradle/plugins/build-parameters/build.gradle[tags=boolean-parameter]
 ----
 
-Boolean parameters can only be set to 'true' or 'false'.
-The empty string is also mapped to 'true' so that `-Pmybool` is the same as `-Pmybool=true`.
+String values 'true', and '1' are mapped to `true`.
+The empty string is also mapped to `true` so that `-Pmybool` is the same as `-Pmybool=true`.
+Only the string value 'false' is mapped to `false`.
 All other values will lead to an error during build configuration.
 
 ==== Enum parameters

src/main/java/org/gradlex/buildparameters/PluginCodeGeneration.java

@@ -239,9 +239,9 @@ private void generateEnumParseMethod(String typeName, List<String> values, List<
 
     private void generateBooleanParseMethod(BooleanBuildParameter p, List<String> lines) {
         lines.add("    private static boolean parse" + p.id.toSimpleTypeName() + "(String p) {");
-        lines.add("        if (p.isEmpty() || p.equalsIgnoreCase(\"true\")) return true;");
+        lines.add("        if (p.isEmpty() || p.equalsIgnoreCase(\"true\") || p.equals(\"1\")) return true;");
         lines.add("        if (p.equalsIgnoreCase(\"false\")) return false;");
-        lines.add("        throw new RuntimeException(\"Value '\" + p + \"' for parameter '" + p.id.toPropertyPath() + "' is not a valid boolean value - use 'true' (or '') / 'false'\");");
+        lines.add("        throw new RuntimeException(\"Value '\" + p + \"' for parameter '" + p.id.toPropertyPath() + "' is not a valid boolean value. Allowed values are strings 'true', '1', and empty string for true, and string 'false' for false\");");
         lines.add("    }");
     }
 

src/test/groovy/org/gradlex/buildparameters/GeneratedPluginFuncTest.groovy

@@ -157,7 +157,7 @@ class GeneratedPluginFuncTest extends Specification {
         """
 
         expect:
-        build("help", "-Pg1.myParameter", "-Pg2.myParameter=false")
+        build("help", "-Pg1.myParameter=true", "-Pg2.myParameter=false")
     }
 
     def "supports boolean build parameters without default value"() {
@@ -182,7 +182,28 @@ class GeneratedPluginFuncTest extends Specification {
         """
 
         expect:
-        build("help", "-Pg1.myParameter", "-Pg2.myParameter=false")
+        build("help", "-Pg1.myParameter=true", "-Pg2.myParameter=false")
+    }
+
+    def "supports alternative values for boolean build parameters"() {
+        given:
+        buildLogicBuildFile << """
+            buildParameters {
+                group("g1") {
+                    bool("myParameter")
+                }
+                group("g2") {
+                    bool("myParameter")
+                }
+            }
+        """
+        buildFile << """
+            assert buildParameters.g1.myParameter.get() == true
+            assert buildParameters.g2.myParameter.get() == true
+        """
+
+        expect: "empty string and '1' are also mapped to true"
+        build("help", "-Pg1.myParameter", "-Pg2.myParameter=1")
     }
 
     def "using an unknown value for a boolean parameter leads to an error"() {
@@ -201,7 +222,7 @@ class GeneratedPluginFuncTest extends Specification {
         def result = buildAndFail("help", "-Pg1.myParameter=treu")
 
         then:
-        result.output.contains("Value 'treu' for parameter 'g1.myParameter' is not a valid boolean value - use 'true' (or '') / 'false'")
+        result.output.contains("Value 'treu' for parameter 'g1.myParameter' is not a valid boolean value. Allowed values are strings 'true', '1', and empty string for true, and string 'false' for false")
     }
 
     def "supports enum build parameters with default value"() {