refactor: improve file reference completion

The completion provider for DevInLanguage now uses the correct file reference type and retrieves recently opened files from the editor history manager to enhance the file reference completion suggestions.

Author: phodal

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

@@ -19,7 +19,7 @@ class DevInCompletionContributor : CompletionContributor() {
         extend(CompletionType.BASIC, PlatformPatterns.psiElement(DevInTypes.AGENT_ID), BuiltinAgentProvider())
         extend(
             CompletionType.BASIC,
-            valuePattern(FileReferenceLanguageProvider.REF_TYPE),
+            valuePattern(FileReferenceLanguageProvider.FILE_REF_TYPE),
             FileReferenceLanguageProvider()
         )
     }

exts/devin-lang/src/main/kotlin/cc/unitmesh/devti/language/completion/FileReferenceLanguageProvider.kt

@@ -5,13 +5,12 @@ import com.intellij.codeInsight.lookup.LookupElementBuilder
 import com.intellij.ide.presentation.VirtualFilePresentation
 import com.intellij.openapi.fileEditor.impl.EditorHistoryManager
 import com.intellij.openapi.project.guessProjectDir
-import com.intellij.openapi.vfs.VirtualFile
 import com.intellij.util.ProcessingContext
 import java.io.File
 
 class FileReferenceLanguageProvider : CompletionProvider<CompletionParameters>() {
     companion object {
-        const val REF_TYPE = "file"
+        const val FILE_REF_TYPE = "file"
     }
 
     override fun addCompletions(
@@ -21,13 +20,11 @@ class FileReferenceLanguageProvider : CompletionProvider<CompletionParameters>()
     ) {
         val project = parameters.position.project
         val basePath = project.guessProjectDir()?.path ?: return
-
-        val editorHistoryManager = EditorHistoryManager.getInstance(project)
-        val fileList: List<VirtualFile> = editorHistoryManager.fileList
+        val recentlyFiles = EditorHistoryManager.getInstance(project).fileList
 
         // TODO: file should be in project
 
-        fileList.forEach {
+        recentlyFiles.forEach {
             val removePrefix = it.path.removePrefix(basePath)
             val relativePath: String = removePrefix.removePrefix(File.separator)