fix(java): Clean up PsiMethod and improve MethodContext creation

- 修复了 PsiMethod 的清理方法，并改进了 MethodContext 的创建过程。

Author: phodal

core/src/main/kotlin/cc/unitmesh/devti/intentions/action/task/LivingDocPromptBuilder.kt

@@ -48,7 +48,7 @@ open class LivingDocPromptBuilder(
     protected val contextProviders = listOf(
         VariableContextProvider(false, false, false),
         ClassContextProvider(false),
-        MethodContextProvider(false, false)
+        MethodContextProvider(true, false)
     )
 
     private fun contextInstruction(context: LLMCodeContext?): String? {
@@ -91,7 +91,10 @@ open class LivingDocPromptBuilder(
                 """.trimIndent()
         }
 
-        return instruction.trimStart()
+        // here is related context information of the method
+
+        val related = "\nHere is related context information of the method\n\n```${context.language}" + context.format() + "\n```\n"
+        return instruction.trimStart() + related
     }
 
     /**
@@ -139,7 +142,7 @@ open class LivingDocPromptBuilder(
                 instruction.append("\n\nStart your documentation with ${startEndString.first} here, and ends with `${startEndString.second}`.\n")
             }
 
-            instruction.append(documentation.forbiddenRules.joinToString { "\n- $it" })
+            instruction.append(documentation.forbiddenRules.joinToString { "\n- $it\n" })
             instruction.toString()
         }
     }

core/src/main/kotlin/cc/unitmesh/devti/provider/LivingDocumentation.kt

@@ -27,6 +27,7 @@ interface LivingDocumentation {
     fun findNearestDocumentationTarget(psiElement: PsiElement): PsiNameIdentifierOwner?
 
     fun findDocTargetsInSelection(root: PsiElement, selectionModel: SelectionModel): List<PsiNameIdentifierOwner>
+
     fun containsElement(selectionModel: SelectionModel, element: PsiElement): Boolean {
         return selectionModel.selectionStart <= element.textRange.startOffset && element.textRange.endOffset <= selectionModel.selectionEnd
     }

java/src/main/kotlin/cc/unitmesh/idea/context/JavaMethodContextBuilder.kt

@@ -3,6 +3,7 @@ package cc.unitmesh.idea.context
 import cc.unitmesh.devti.context.MethodContext
 import cc.unitmesh.devti.context.builder.ClassContextBuilder
 import cc.unitmesh.devti.context.builder.MethodContextBuilder
+import cc.unitmesh.idea.service.JavaRelatedContext.cleanUp
 import cc.unitmesh.idea.service.JavaTypeUtil
 import com.intellij.openapi.application.runReadAction
 import com.intellij.psi.PsiElement
@@ -19,7 +20,7 @@ class JavaMethodContextBuilder : MethodContextBuilder {
             return null
         }
 
-        val parameterList = runReadAction { psiElement.parameters.mapNotNull { it.name }}
+        val parameterList = runReadAction { psiElement.parameters.mapNotNull { it.name } }
         val variableContextList = parameterList.map { it }
 
         val usagesList = if (gatherUsages) {
@@ -34,30 +35,32 @@ class JavaMethodContextBuilder : MethodContextBuilder {
             emptyList()
         }
 
-        return runReadAction { MethodContext(
-            psiElement,
-            text = psiElement.text,
-            name = psiElement.name,
-            signature = getSignatureString(psiElement),
-            enclosingClass = psiElement.containingClass,
-            language = psiElement.language.displayName,
-            returnType = processReturnTypeText(psiElement.returnType?.presentableText),
-            variableContextList,
-            includeClassContext,
-            usagesList,
-            ios
-        )}
+        return runReadAction {
+            MethodContext(
+                psiElement,
+                text = psiElement.text,
+                name = psiElement.name,
+                signature = getSignatureString(psiElement),
+                enclosingClass = psiElement.containingClass,
+                language = psiElement.language.displayName,
+                returnType = processReturnTypeText(psiElement.returnType?.presentableText),
+                variableContextList,
+                includeClassContext,
+                usagesList,
+                ios
+            )
+        }
     }
 
     private fun processReturnTypeText(returnType: String?): String? {
         return if (returnType == "void") null else returnType
     }
 
     private fun getSignatureString(method: PsiMethod): String {
-        val bodyStart = runReadAction { method.body?.startOffsetInParent ?: method.textLength }
-        val text = runReadAction { method.text }
-        val substring = text.substring(0, bodyStart)
-        val trimmed = substring.replace('\n', ' ').trim()
+        val text = runReadAction {
+            cleanUp(method).text
+        }
+        val trimmed = text.replace('\n', ' ').trim()
         return trimmed
     }
 }

java/src/main/kotlin/cc/unitmesh/idea/service/JavaRelatedContext.kt

@@ -60,6 +60,13 @@ object JavaRelatedContext {
         return psiElement
     }
 
+    fun cleanUp(psiMethod: PsiMethod): PsiMethod {
+        val psiElement = psiMethod.copy() as PsiMethod
+        psiElement.body?.delete()
+        psiElement.docComment?.delete()
+        return psiElement
+    }
+
     private fun findSuperClasses(psiClass: PsiClass): List<PsiClass> {
         val superClass = psiClass.superClass ?: return emptyList()
         if (isProjectContent(superClass)) {