feat(templates): add ability to filter values in EnumParameter

templates-api/src/main/java/com/itsaky/androidide/templates/base/base.kt

@@ -20,6 +20,7 @@ package com.itsaky.androidide.templates.base
 import com.itsaky.androidide.templates.CheckBoxWidget
 import com.itsaky.androidide.templates.FileTemplate
 import com.itsaky.androidide.templates.FileTemplateRecipeResult
+import com.itsaky.androidide.templates.Language
 import com.itsaky.androidide.templates.ModuleTemplate
 import com.itsaky.androidide.templates.ModuleTemplateData
 import com.itsaky.androidide.templates.ModuleType
@@ -33,6 +34,7 @@ import com.itsaky.androidide.templates.ProjectTemplate
 import com.itsaky.androidide.templates.ProjectTemplateData
 import com.itsaky.androidide.templates.ProjectVersionData
 import com.itsaky.androidide.templates.R
+import com.itsaky.androidide.templates.Sdk
 import com.itsaky.androidide.templates.SpinnerWidget
 import com.itsaky.androidide.templates.TextFieldWidget
 import com.itsaky.androidide.templates.base.util.moduleNameToDir
@@ -49,20 +51,25 @@ import java.io.File
 
 typealias AndroidModuleTemplateConfigurator = AndroidModuleTemplateBuilder.() -> Unit
 
-
 /**
  * Setup base files for project templates.
  *
  * @param block Function to configure the template.
  */
-fun baseProject(block: ProjectTemplateBuilder.() -> Unit
+fun baseProject(sdkFilter: ((Sdk) -> Boolean)? = null,
+                languageFilter: ((Language) -> Boolean)? = null,
+                block: ProjectTemplateBuilder.() -> Unit
 ): ProjectTemplate {
   return ProjectTemplateBuilder().apply {
     val projectName = projectNameParameter()
-    val language = projectLanguageParameter()
-    val minSdk = minSdkParameter()
     val packageName = packageNameParameter()
     val useKts = useKtsParameter()
+    val minSdk = minSdkParameter {
+      filter = sdkFilter
+    }
+    val language = projectLanguageParameter {
+      filter = languageFilter
+    }
 
     // When project name is changed, change the package name accordingly
     projectName.observe { name ->
@@ -170,8 +177,8 @@ fun baseAndroidModule(isLibrary: Boolean = false,
       ModuleTemplateData(name = moduleName.value, appName = appName?.value,
         packageName = packageName.value,
         projectDir = requireProjectData().moduleNameToDir(moduleName.value),
-        type = type.value, language = language.value,
-        minSdk = minSdk.value, useKts = useKts.value)
+        type = type.value, language = language.value, minSdk = minSdk.value,
+        useKts = useKts.value)
     }
     postRecipe = commonPostRecipe()
 

templates-api/src/main/java/com/itsaky/androidide/templates/parameters.kt

@@ -253,19 +253,21 @@ class EnumParameter<T : Enum<*>>(@StringRes name: Int,
                                  onStartIconClick: (() -> Unit)?,
                                  onEndIconClick: (() -> Unit)?,
                                  constraints: List<ParameterConstraint>,
-                                 val displayName: ((T) -> String)? = null
+                                 val displayName: ((T) -> String)? = null,
+                                 val filter: ((T) -> Boolean)? = null
 ) : TextFieldParameter<T>(name, description, default, startIcon, endIcon,
   onStartIconClick, onEndIconClick, constraints)
 
 class EnumParameterBuilder<T : Enum<*>> : TextFieldParameterBuilder<T>() {
 
   var displayName: ((T) -> String)? = null
+  var filter: ((T) -> Boolean)? = null
 
   override fun build(): EnumParameter<T> {
     return EnumParameter(name = name!!, description = description,
       default = default!!, startIcon = startIcon, endIcon = endIcon,
       onStartIconClick = onStartIconClick, onEndIconClick = onEndIconClick,
-      constraints = constraints, displayName = displayName)
+      constraints = constraints, displayName = displayName, filter = filter)
   }
 }
 

templates-impl/src/main/java/com/itsaky/androidide/templates/impl/TemplateWidgetViewProviderImpl.kt

@@ -138,6 +138,12 @@ class TemplateWidgetViewProviderImpl : ITemplateWidgetViewProvider {
       val nameToEnum = mutableMapOf<String, Enum<*>>()
       val enumToName = mutableMapOf<Enum<*>, String>()
       param.default.javaClass.enumConstants?.forEach {
+
+        // remove the elements for which the filter fails
+        if (param.filter?.invoke(it) == false) {
+          return@forEach
+        }
+
         val displayName = param.displayName?.invoke(it) ?: it.name
         nameToEnum[displayName] = it
         enumToName[it] = displayName
@@ -174,6 +180,14 @@ class TemplateWidgetViewProviderImpl : ITemplateWidgetViewProvider {
         }
       }
 
+      if (param.default != nameToEnum[defaultName]) {
+        // the default value may have been filtered
+        // reset the value to the first item
+        val first = checkNotNull(
+          nameToEnum.values.firstOrNull()) { "No entries available for enum parameter (all entries filtered out?)." }
+        param.setValue(first)
+      }
+
       param.observe(observer)
     }.root
   }

templates-impl/src/main/java/com/itsaky/androidide/templates/impl/base.kt

@@ -17,7 +17,9 @@
 
 package com.itsaky.androidide.templates.impl
 
+import com.itsaky.androidide.templates.Language
 import com.itsaky.androidide.templates.ProjectTemplate
+import com.itsaky.androidide.templates.Sdk
 import com.itsaky.androidide.templates.base.AndroidModuleTemplateBuilder
 import com.itsaky.androidide.templates.base.ProjectTemplateBuilder
 import com.itsaky.androidide.templates.base.baseProject
@@ -43,8 +45,10 @@ internal fun AndroidModuleTemplateBuilder.templateAsset(name: String,
   return "templates/${name}/${path}"
 }
 
-internal fun baseProjectImpl(block: ProjectTemplateBuilder.() -> Unit
-): ProjectTemplate = baseProject {
+internal fun baseProjectImpl(sdkFilter: ((Sdk) -> Boolean)? = null,
+                             languageFilter: ((Language) -> Boolean)? = null,
+                             block: ProjectTemplateBuilder.() -> Unit
+): ProjectTemplate = baseProject(sdkFilter = sdkFilter, languageFilter = languageFilter) {
   block()
 
   // make sure we return a proper result