feat(completion): refactor completion provider and add support for revision references #101

The completion provider for the DevIn language has been refactored to improve code organization and maintainability. The `DevInCompletionContributor` class has been simplified and moved to the `completion` package. Additionally, a new class `RevisionReferenceLanguageProvider` has been added to provide completion suggestions for git revisions. This provider retrieves the list of commits from the current branch and adds them as completion options. The `BuiltinAgentProvider` has been updated to reflect the change in the `REV` agent's description to better match its functionality.

Author: phodal

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

@@ -1,5 +1,6 @@
-package cc.unitmesh.devti.language.completion
+package cc.unitmesh.devti.language
 
+import cc.unitmesh.devti.language.completion.*
 import cc.unitmesh.devti.language.psi.DevInFile
 import cc.unitmesh.devti.language.psi.DevInTypes
 import cc.unitmesh.devti.language.psi.DevInUsed
@@ -22,6 +23,11 @@ class DevInCompletionContributor : CompletionContributor() {
             valuePattern(FileReferenceLanguageProvider.FILE_REF_TYPE),
             FileReferenceLanguageProvider()
         )
+        extend(
+            CompletionType.BASIC,
+            valuePattern(RevisionReferenceLanguageProvider.REV_REF_TYPE),
+            RevisionReferenceLanguageProvider()
+        )
     }
 
     override fun beforeCompletion(context: CompletionInitializationContext) {

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

@@ -7,7 +7,7 @@ import com.intellij.util.ProcessingContext
 
 enum class BuiltinAgent(val agentName: String, val description: String) {
     FILE("file", "Read the content of a file"),
-    REV("rev", "Read git revision of a file"),
+    REV("rev", "Read git change by revision"),
     SYMBOL("symbol", "Read content by Java/Kotlin canonicalName"),
     WRITE("write", "Write content to a file, format: /write:/path/to/file:L1-C2"),
     ;

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

@@ -0,0 +1,44 @@
+package cc.unitmesh.devti.language.completion
+
+import com.intellij.codeInsight.completion.CompletionParameters
+import com.intellij.codeInsight.completion.CompletionProvider
+import com.intellij.codeInsight.completion.CompletionResultSet
+import com.intellij.codeInsight.lookup.LookupElementBuilder
+import com.intellij.icons.AllIcons
+import com.intellij.openapi.project.Project
+import com.intellij.util.ProcessingContext
+import git4idea.GitCommit
+import git4idea.GitIcons
+import git4idea.history.GitHistoryUtils
+import git4idea.repo.GitRepositoryManager
+import git4idea.ui.branch.BranchIconUtil
+
+
+class RevisionReferenceLanguageProvider : CompletionProvider<CompletionParameters>() {
+    companion object {
+        const val REV_REF_TYPE = "rev"
+    }
+
+    override fun addCompletions(
+        parameters: CompletionParameters,
+        context: ProcessingContext,
+        result: CompletionResultSet,
+    ) {
+        val project: Project = parameters.editor.project ?: return
+        val repository = GitRepositoryManager.getInstance(project).repositories.firstOrNull() ?: return
+        val branchName = repository.currentBranchName
+        val commits: List<GitCommit> = GitHistoryUtils.history(project, repository.root, branchName)
+
+        commits.forEach {
+            try {
+                val element = LookupElementBuilder.create(it.fullMessage)
+                    .withIcon(AllIcons.Vcs.Branch)
+                    .withTypeText(it.id.toShortString(), true)
+
+                result.addElement(element)
+            } catch (e: Exception) {
+//                e.printStackTrace()
+            }
+        }
+    }
+}

exts/devin-lang/src/main/resources/cc.unitmesh.devti.language.xml

@@ -18,7 +18,7 @@
         <typedHandler implementation="cc.unitmesh.devti.language.DevInTypedHandler"/>
 
         <completion.contributor language="DevIn"
-                                implementationClass="cc.unitmesh.devti.language.completion.DevInCompletionContributor"/>
+                                implementationClass="cc.unitmesh.devti.language.DevInCompletionContributor"/>
 
         <lang.foldingBuilder language="DevIn"
                              implementationClass="cc.unitmesh.devti.language.folding.DevInCustomVariableFoldingBuilder"/>