[Fix] 稳定 prompt pick 选择结果

packages/core/src/services/prompt_renderer.ts

@@ -95,8 +95,12 @@ export class ChatLunaPromptRenderService {
             return selectFromList(args.join(','), false)
         })
 
-        this.registerFunctionProvider('pick', (args) => {
-            return selectFromList(args.join(','), true)
+        this.registerFunctionProvider('pick', (args, _variables, cfg) => {
+            return selectFromList(
+                args.join(','),
+                true,
+                cfg?.conversationId ?? ''
+            )
         })
 
         this.registerFunctionProvider('roll', (args) => {

packages/core/src/utils/string.ts

@@ -317,11 +317,18 @@ export const getTimeDiff = (time1: string, time2: string): string => {
     )
 }
 
-export const selectFromList = (args: string, isPick: boolean): string => {
+export const selectFromList = (
+    args: string,
+    isPick: boolean,
+    seed: string = ''
+): string => {
     const items = args.split(',').map((item) => item.trim())
     if (isPick) {
-        // TODO: Implement stable selection for 'pick'
-        return items[Math.floor(Math.random() * items.length)]
+        const hash = crypto
+            .createHash('sha1')
+            .update(`${seed}:${args}`)
+            .digest()
+        return items[hash.readUInt32BE(0) % items.length]
     }
     return items[Math.floor(Math.random() * items.length)]
 }

packages/core/tests/conversation-utils.spec.ts

@@ -12,11 +12,13 @@ import {
     getMessageContent,
     parsePresetLaneInput
 } from '../src/utils/message_content'
+import { ChatLunaPromptRenderService } from '../src/services/prompt_renderer'
 import {
     applyPresetLane,
     computeBaseBindingKey
 } from '../src/types'
 import { usageSourceFromStack } from '../src/utils/usage_source'
+import { selectFromList } from '../src/utils/string'
 import {
     createMessage,
     type BindingSessionShape,
@@ -192,6 +194,37 @@ it('usageSourceFromStack reads package names instead of folder names', () => {
     )
 })
 
+it('selectFromList keeps pick stable for a seed', () => {
+    assert.equal(selectFromList('red,green,blue', true, 'stable'), 'blue')
+    assert.equal(selectFromList('red,green,blue', true, 'stable'), 'blue')
+    assert.equal(
+        selectFromList('red,green,blue', true, 'conversation-b'),
+        'green'
+    )
+})
+
+it('prompt pick renders without configurable options', async () => {
+    const service = new ChatLunaPromptRenderService()
+    const result = await service.renderTemplate('{pick("red","green","blue")}')
+
+    assert.equal(result.text, 'green')
+})
+
+it('prompt pick uses conversation id as stable seed', async () => {
+    const service = new ChatLunaPromptRenderService()
+    const result = await service.renderTemplate(
+        '{pick("red","green","blue")}',
+        {},
+        {
+            configurable: {
+                conversationId: 'conversation-b'
+            }
+        }
+    )
+
+    assert.equal(result.text, 'green')
+})
+
 it('getMessageContent flattens structured text parts', () => {
     assert.equal(
         getMessageContent([