feat(devins-lang): add rule completion and update rule path

- Add RuleCompletionProvider for autocompleting rule names
- Update rule file path from 'prompts/rule' to 'prompts/rules'
- Extend DevInCompletionContributor to include rule completion

Author: phodal

exts/devins-lang/src/main/kotlin/cc/unitmesh/devti/language/compiler/exec/RuleInsCommand.kt

@@ -11,7 +11,7 @@ class RuleInsCommand(val myProject: Project, private val filename: String) : Ins
     override val commandName: BuiltinCommand = BuiltinCommand.OPEN
 
     override suspend fun execute(): String? {
-        val fullname = "prompts/rule/$filename.md"
+        val fullname = "prompts/rules/$filename.md"
         val file = myProject.lookupFile(fullname)
 
         if (file != null) {

exts/devins-lang/src/main/kotlin/cc/unitmesh/devti/language/completion/DevInCompletionContributor.kt

@@ -53,6 +53,11 @@ class DevInCompletionContributor : CompletionContributor() {
             valuePattern(BuiltinCommand.DATABASE.commandName),
             DatabaseFuncCompletionProvider()
         )
+        extend(
+            CompletionType.BASIC,
+            valuePattern(BuiltinCommand.RULE.commandName),
+            RuleCompletionProvider()
+        )
     }
 
     private inline fun <reified I : PsiElement> psiElement() = PlatformPatterns.psiElement(I::class.java)

exts/devins-lang/src/main/kotlin/cc/unitmesh/devti/language/completion/provider/RuleCompletionProvider.kt

@@ -0,0 +1,44 @@
+package cc.unitmesh.devti.language.completion.provider
+
+import cc.unitmesh.devti.gui.chat.AutoDevFileLookupElement
+import com.intellij.codeInsight.completion.CompletionParameters
+import com.intellij.codeInsight.completion.CompletionProvider
+import com.intellij.codeInsight.completion.CompletionResultSet
+import com.intellij.codeInsight.lookup.LookupElement
+import com.intellij.codeInsight.lookup.LookupElementBuilder
+import com.intellij.openapi.project.guessProjectDir
+import com.intellij.openapi.roots.ProjectFileIndex
+import com.intellij.openapi.vfs.VirtualFile
+import com.intellij.openapi.vfs.isFile
+import com.intellij.util.ProcessingContext
+
+class RuleCompletionProvider : CompletionProvider<CompletionParameters>() {
+    override fun addCompletions(
+        parameters: CompletionParameters,
+        context: ProcessingContext,
+        result: CompletionResultSet,
+    ) {
+        val project = parameters.position.project
+
+       val rulePath = "prompts/rules"
+        val ruleDir = project.guessProjectDir()?.findFileByRelativePath(rulePath) ?: return
+        val files = ruleDir.children.filter { it.isFile && (it.extension == "md") }
+
+        files.forEach { file ->
+            val priority = 1.0
+            result.addElement(buildElement(file, priority))
+        }
+    }
+
+    private fun buildElement(virtualFile: VirtualFile, priority: Double): LookupElement {
+        val filename = virtualFile.nameWithoutExtension
+
+        val elementBuilder = LookupElementBuilder.create(filename)
+            .withInsertHandler { context, _ ->
+                context.editor.caretModel.moveCaretRelatively(1, 1, false, false, false)
+            }
+
+        return AutoDevFileLookupElement.withPriority(elementBuilder, priority, virtualFile)
+    }
+}
+