Add LLM chat history widget (#3907)

Co-authored-by: github-actions <github-actions@github.com>

src/components/graph/widgets/ChatHistoryWidget.vue

@@ -0,0 +1,135 @@
+<template>
+  <ScrollPanel
+    ref="scrollPanelRef"
+    class="w-full min-h-[400px] rounded-lg px-2 py-2 text-xs"
+    :pt="{ content: { id: 'chat-scroll-content' } }"
+  >
+    <div v-for="(item, i) in parsedHistory" :key="i" class="mb-4">
+      <!-- Prompt (user, right) -->
+      <span
+        :class="{
+          'opacity-40 pointer-events-none': editIndex !== null && i > editIndex
+        }"
+      >
+        <div class="flex justify-end mb-1">
+          <div
+            class="bg-gray-300 dark-theme:bg-gray-800 rounded-xl px-4 py-1 max-w-[80%] text-right"
+          >
+            <div class="break-words text-[12px]">{{ item.prompt }}</div>
+          </div>
+        </div>
+        <div class="flex justify-end mb-2 mr-1">
+          <CopyButton :text="item.prompt" />
+          <Button
+            v-tooltip="
+              editIndex === i ? $t('chatHistory.cancelEditTooltip') : null
+            "
+            text
+            rounded
+            class="!p-1 !h-4 !w-4 text-gray-400 hover:text-gray-600 dark-theme:hover:text-gray-200 transition"
+            pt:icon:class="!text-xs"
+            :icon="editIndex === i ? 'pi pi-times' : 'pi pi-pencil'"
+            :aria-label="
+              editIndex === i ? $t('chatHistory.cancelEdit') : $t('g.edit')
+            "
+            @click="editIndex === i ? handleCancelEdit() : handleEdit(i)"
+          />
+        </div>
+      </span>
+      <!-- Response (LLM, left) -->
+      <ResponseBlurb
+        :text="item.response"
+        :class="{
+          'opacity-25 pointer-events-none': editIndex !== null && i >= editIndex
+        }"
+      >
+        <div v-html="nl2br(linkifyHtml(item.response))" />
+      </ResponseBlurb>
+    </div>
+  </ScrollPanel>
+</template>
+
+<script setup lang="ts">
+import Button from 'primevue/button'
+import ScrollPanel from 'primevue/scrollpanel'
+import { computed, nextTick, ref, watch } from 'vue'
+
+import CopyButton from '@/components/graph/widgets/chatHistory/CopyButton.vue'
+import ResponseBlurb from '@/components/graph/widgets/chatHistory/ResponseBlurb.vue'
+import { ComponentWidget } from '@/scripts/domWidget'
+import { linkifyHtml, nl2br } from '@/utils/formatUtil'
+
+const { widget, history = '[]' } = defineProps<{
+  widget?: ComponentWidget<string>
+  history: string
+}>()
+
+const editIndex = ref<number | null>(null)
+const scrollPanelRef = ref<InstanceType<typeof ScrollPanel> | null>(null)
+
+const parsedHistory = computed(() => JSON.parse(history || '[]'))
+
+const findPromptInput = () =>
+  widget?.node.widgets?.find((w) => w.name === 'prompt')
+let promptInput = findPromptInput()
+const previousPromptInput = ref<string | null>(null)
+
+const getPreviousResponseId = (index: number) =>
+  index > 0 ? parsedHistory.value[index - 1]?.response_id ?? '' : ''
+
+const storePromptInput = () => {
+  promptInput ??= widget?.node.widgets?.find((w) => w.name === 'prompt')
+  if (!promptInput) return
+
+  previousPromptInput.value = String(promptInput.value)
+}
+
+const setPromptInput = (text: string, previousResponseId?: string | null) => {
+  promptInput ??= widget?.node.widgets?.find((w) => w.name === 'prompt')
+  if (!promptInput) return
+
+  if (previousResponseId !== null) {
+    promptInput.value = `<starting_point_id:${previousResponseId}>\n\n${text}`
+  } else {
+    promptInput.value = text
+  }
+}
+
+const handleEdit = (index: number) => {
+  if (!promptInput) return
+
+  editIndex.value = index
+  const prevResponseId = index === 0 ? 'start' : getPreviousResponseId(index)
+  const promptText = parsedHistory.value[index]?.prompt ?? ''
+
+  storePromptInput()
+  setPromptInput(promptText, prevResponseId)
+}
+
+const resetEditingState = () => {
+  editIndex.value = null
+}
+const handleCancelEdit = () => {
+  resetEditingState()
+  if (promptInput) {
+    promptInput.value = previousPromptInput.value ?? ''
+  }
+}
+
+const scrollChatToBottom = () => {
+  const content = document.getElementById('chat-scroll-content')
+  if (content) {
+    content.scrollTo({ top: content.scrollHeight, behavior: 'smooth' })
+  }
+}
+
+const onHistoryChanged = () => {
+  resetEditingState()
+  void nextTick(() => scrollChatToBottom())
+}
+
+watch(() => parsedHistory.value, onHistoryChanged, {
+  immediate: true,
+  deep: true
+})
+</script>

src/components/graph/widgets/DomWidget.vue

@@ -11,6 +11,7 @@
       v-if="isComponentWidget(widget)"
       :model-value="widget.value"
       :widget="widget"
+      v-bind="widget.props"
       @update:model-value="emit('update:widgetValue', $event)"
     />
   </div>

src/components/graph/widgets/chatHistory/CopyButton.vue

@@ -0,0 +1,36 @@
+<template>
+  <Button
+    v-tooltip="
+      copied ? $t('chatHistory.copiedTooltip') : $t('chatHistory.copyTooltip')
+    "
+    text
+    rounded
+    class="!p-1 !h-4 !w-6 text-gray-400 hover:text-gray-600 dark-theme:hover:text-gray-200 transition"
+    pt:icon:class="!text-xs"
+    :icon="copied ? 'pi pi-check' : 'pi pi-copy'"
+    :aria-label="
+      copied ? $t('chatHistory.copiedTooltip') : $t('chatHistory.copyTooltip')
+    "
+    @click="handleCopy"
+  />
+</template>
+
+<script setup lang="ts">
+import Button from 'primevue/button'
+import { ref } from 'vue'
+
+const { text } = defineProps<{
+  text: string
+}>()
+
+const copied = ref(false)
+
+const handleCopy = async () => {
+  if (!text) return
+  await navigator.clipboard.writeText(text)
+  copied.value = true
+  setTimeout(() => {
+    copied.value = false
+  }, 1024)
+}
+</script>

src/components/graph/widgets/chatHistory/ResponseBlurb.vue

@@ -0,0 +1,22 @@
+<template>
+  <span>
+    <div class="flex justify-start mb-1">
+      <div class="rounded-xl px-4 py-1 max-w-[80%]">
+        <div class="break-words text-[12px]">
+          <slot />
+        </div>
+      </div>
+    </div>
+    <div class="flex justify-start ml-1">
+      <CopyButton :text="text" />
+    </div>
+  </span>
+</template>
+
+<script setup lang="ts">
+import CopyButton from '@/components/graph/widgets/chatHistory/CopyButton.vue'
+
+defineProps<{
+  text: string
+}>()
+</script>