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feat: Add preview panel to session selector (cn ls / /resume) (#8231)
* feat: Add preview panel to session selector for chat history - Created SessionPreview component to display chat history - Updated SessionSelector to show two-column layout with preview on right - Preview shows first 10 messages with truncation for long content - Preview only displays when terminal width > 100 columns - Automatically loads and displays session history as cursor moves Fixes CON-3892 Generated with Continue(https://continue.dev) Co-Authored-By: Continue <noreply@continue.dev> Co-authored-by: Username <nate@continue.dev> * chore: Adjust session selector layout to 30/70 split - Changed list width from 45% to 30% of terminal width - Preview panel now takes up 70% of the right side - Provides more space for chat history preview Co-Authored-By: Continue <noreply@continue.dev> Co-authored-by: Username <nate@continue.dev> * fix lint * preview pane takes full width * check terminal height and skip empty messages --------- Co-authored-by: Continue Agent <agent@continue.dev> Co-authored-by: Continue <noreply@continue.dev> Co-authored-by: Username <nate@continue.dev> Co-authored-by: Ting-Wai To <40179554+tingwai@users.noreply.github.com>
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‎extensions/cli/src/ui/SessionPreview.tsx‎

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,110 @@
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import type { ChatHistoryItem } from "core/index.js";
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import { Box, Text } from "ink";
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import React, { useMemo } from "react";
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import { useTerminalSize } from "./hooks/useTerminalSize.js";
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import { defaultBoxStyles } from "./styles.js";
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interface SessionPreviewProps {
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chatHistory: ChatHistoryItem[];
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sessionTitle: string;
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}
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function formatMessageContent(content: string | any): string {
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if (typeof content === "string") {
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return content;
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} else if (Array.isArray(content)) {
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// For array content, find the first text part
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const textPart = content.find((part: any) => part.type === "text");
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return textPart && "text" in textPart
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? textPart.text
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: "(multimodal message)";
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}
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return "(unknown content type)";
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}
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export function SessionPreview({
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chatHistory,
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sessionTitle,
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}: SessionPreviewProps) {
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const { rows: terminalHeight } = useTerminalSize();
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// Filter and format messages for preview
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const previewMessages = useMemo(() => {
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return chatHistory
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.filter((item) => {
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// Skip system messages
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if (item.message.role === "system") return false;
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// Skip empty assistant messages
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if (item.message.role === "assistant") {
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const content = formatMessageContent(item.message.content);
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if (!content || content.trim() === "") return false;
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}
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return true;
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})
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.map((item) => ({
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role: item.message.role,
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content: formatMessageContent(item.message.content),
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}));
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}, [chatHistory]);
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// Calculate how many messages we can display based on terminal height
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const maxMessages = useMemo(() => {
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// Account for:
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// - Box border (top + bottom): 2 lines
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// - Box padding (top + bottom): 2 lines
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// - Title line: 1 line
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// - Empty line after title: 1 line
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// - "... and X more messages" line: 1 line
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// - Each message: ~4 lines (role + content + marginBottom)
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const OVERHEAD = 7;
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const LINES_PER_MESSAGE = 4;
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const availableHeight = Math.max(1, terminalHeight - OVERHEAD);
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return Math.max(1, Math.floor(availableHeight / LINES_PER_MESSAGE));
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}, [terminalHeight]);
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if (previewMessages.length === 0) {
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return (
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<Box {...defaultBoxStyles("blue")} flexDirection="column" width="100%">
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<Text color="blue" bold>
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Preview
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</Text>
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<Text color="gray">(no messages)</Text>
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</Box>
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);
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}
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return (
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<Box {...defaultBoxStyles("blue")} flexDirection="column" width="100%">
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<Text color="blue" bold>
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{sessionTitle}
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</Text>
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<Text> </Text>
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{previewMessages.slice(0, maxMessages).map((msg, index) => {
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const roleColor = msg.role === "user" ? "green" : "cyan";
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const roleLabel = msg.role === "user" ? "You" : "Assistant";
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// Truncate long messages for preview
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const truncatedContent =
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msg.content.length > 150
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? msg.content.substring(0, 150) + "..."
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: msg.content;
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return (
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<Box key={index} flexDirection="column" marginBottom={1}>
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<Text color={roleColor} bold>
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{roleLabel}:
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</Text>
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<Text wrap="truncate-end">{truncatedContent}</Text>
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</Box>
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);
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})}
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{previewMessages.length > maxMessages && (
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<Text color="gray" italic>
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... and {previewMessages.length - maxMessages} more messages
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</Text>
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)}
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</Box>
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);
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}

‎extensions/cli/src/ui/SessionSelector.tsx‎

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Original file line numberDiff line numberDiff line change
@@ -1,10 +1,12 @@
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import type { Session } from "core/index.js";
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import { format, isThisWeek, isThisYear, isToday, isYesterday } from "date-fns";
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import { Box, Text, useInput } from "ink";
3-
import React, { useMemo, useState } from "react";
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import React, { useEffect, useMemo, useState } from "react";
45

5-
import { ExtendedSessionMetadata } from "../session.js";
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import { ExtendedSessionMetadata, loadSessionById } from "../session.js";
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import { useTerminalSize } from "./hooks/useTerminalSize.js";
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import { SessionPreview } from "./SessionPreview.js";
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import { defaultBoxStyles } from "./styles.js";
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1012
interface SessionSelectorProps {
@@ -40,7 +42,19 @@ export function SessionSelector({
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onExit,
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}: SessionSelectorProps) {
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const [selectedIndex, setSelectedIndex] = useState(0);
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const { rows: terminalHeight } = useTerminalSize();
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const [previewSession, setPreviewSession] = useState<Session | null>(null);
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const { rows: terminalHeight, columns: terminalWidth } = useTerminalSize();
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// Load the selected session for preview
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useEffect(() => {
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const selectedSession = sessions[selectedIndex];
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if (selectedSession && !selectedSession.isRemote) {
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const session = loadSessionById(selectedSession.sessionId);
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setPreviewSession(session);
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} else {
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setPreviewSession(null);
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}
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}, [selectedIndex, sessions]);
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4559
// Calculate how many sessions we can display based on terminal height and scrolling
4660
const { displaySessions, scrollOffset } = useMemo(() => {
@@ -104,54 +118,90 @@ export function SessionSelector({
104118
const hasMoreAbove = scrollOffset > 0;
105119
const hasMoreBelow = scrollOffset + displaySessions.length < sessions.length;
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121+
// Determine if we should show preview (only if terminal is wide enough)
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const showPreview = terminalWidth > 100;
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const listWidth = showPreview
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? Math.floor(terminalWidth * 0.3)
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: terminalWidth;
126+
107127
return (
108-
<Box {...defaultBoxStyles("blue")}>
109-
<Text color="blue" bold>
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Recent Sessions{" "}
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{sessions.length > displaySessions.length &&
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`(${selectedIndex + 1}/${sessions.length})`}
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</Text>
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<Text color="gray">↑/↓ to navigate, Enter to select, Esc to exit</Text>
115-
<Text> </Text>
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{hasMoreAbove && (
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<Text color="gray" italic>
119-
⬆ {scrollOffset} more sessions above...
128+
<Box flexDirection="row" width={terminalWidth}>
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{/* Left side: Session list */}
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<Box {...defaultBoxStyles("blue")} width={listWidth}>
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<Text color="blue" bold>
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Recent Sessions{" "}
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{sessions.length > displaySessions.length &&
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`(${selectedIndex + 1}/${sessions.length})`}
120135
</Text>
121-
)}
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<Text color="gray">↑/↓ to navigate, Enter to select, Esc to exit</Text>
137+
<Text> </Text>
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139+
{hasMoreAbove && (
140+
<Text color="gray" italic>
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⬆ {scrollOffset} more sessions above...
142+
</Text>
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)}
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{displaySessions.map((session, index) => {
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const globalIndex = index + scrollOffset;
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const isSelected = globalIndex === selectedIndex;
148+
const indicator = isSelected ? "➤ " : " ";
149+
const color = isSelected ? "blue" : "white";
150+
151+
return (
152+
<Box key={session.sessionId} flexDirection="column">
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<Box paddingRight={3}>
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<Text bold={isSelected} color={color} wrap="truncate-end">
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{indicator}
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{formatMessage(session.title)}
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</Text>
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</Box>
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<Box marginLeft={2}>
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<Text color="gray">
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{formatTimestamp(new Date(session.dateCreated))}
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{session.isRemote ? " (remote)" : " (local)"}
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</Text>
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</Box>
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{index < displaySessions.length - 1 && (
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<Text key={`spacer-${session.sessionId}`}> </Text>
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)}
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</Box>
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);
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})}
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{hasMoreBelow && (
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<Text color="gray" italic>
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⬇ {sessions.length - scrollOffset - displaySessions.length} more
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sessions below...
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</Text>
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)}
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</Box>
122179

123-
{displaySessions.map((session, index) => {
124-
const globalIndex = index + scrollOffset;
125-
const isSelected = globalIndex === selectedIndex;
126-
const indicator = isSelected ? "➤ " : " ";
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const color = isSelected ? "blue" : "white";
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return (
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<Box key={session.sessionId} flexDirection="column">
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<Box paddingRight={3}>
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<Text bold={isSelected} color={color} wrap="truncate-end">
133-
{indicator}
134-
{formatMessage(session.title)}
180+
{/* Right side: Preview panel */}
181+
{showPreview && (
182+
<Box marginLeft={1} flexGrow={1} width="100%">
183+
{previewSession ? (
184+
<SessionPreview
185+
chatHistory={previewSession.history}
186+
sessionTitle={previewSession.title}
187+
/>
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) : (
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<Box
190+
{...defaultBoxStyles("blue")}
191+
flexDirection="column"
192+
width="100%"
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>
194+
<Text color="blue" bold>
195+
Preview
135196
</Text>
136-
</Box>
137-
<Box marginLeft={2}>
138197
<Text color="gray">
139-
{formatTimestamp(new Date(session.dateCreated))}
140-
{session.isRemote ? " (remote)" : " (local)"}
198+
{sessions[selectedIndex]?.isRemote
199+
? "(remote session preview not available)"
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: "(loading...)"}
141201
</Text>
142202
</Box>
143-
{index < displaySessions.length - 1 && (
144-
<Text key={`spacer-${session.sessionId}`}> </Text>
145-
)}
146-
</Box>
147-
);
148-
})}
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150-
{hasMoreBelow && (
151-
<Text color="gray" italic>
152-
⬇ {sessions.length - scrollOffset - displaySessions.length} more
153-
sessions below...
154-
</Text>
203+
)}
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</Box>
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)}
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</Box>
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);

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