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* Utilities for classifying session events and formatting them for clipboard copy.
*
* Pure functions with no React or DOM dependencies.
*
* @module
*/
import type { SessionEvent } from "../hooks/types.js";
import type { DisplayEvent } from "./sessionEvents.js";
/** Event types that carry meaningful, copyable content. */
const CONTENT_BEARING_TYPES: ReadonlySet<string> = new Set([
"text",
"output",
"user_input",
"turn_started",
"tool_use",
"tool_result",
"error",
]);
/**
* Returns true when an event's type represents copyable content.
*
* Content-bearing: text, output, user_input, tool_use, tool_result, error.
* Non-content: status, signal, usage, system, and anything else.
*/
export function isContentBearingEvent(event: SessionEvent): boolean {
return CONTENT_BEARING_TYPES.has(event.eventType);
}
/**
* Extracts the raw text that should be placed on the clipboard when a single
* event is copied via the hover action row.
*
* This returns the plain content without labels or timestamps — it mirrors
* what the old per-event CopyButton provided.
*/
export function getEventCopyText(event: DisplayEvent): string {
switch (event.eventType) {
case "tool_result": {
// Prefer detailedResult when available (e.g. Copilot unified diffs)
if (event.toolUseCtx?.detailedResult) {
return event.toolUseCtx.detailedResult;
}
// When paired, the result content may be JSON-wrapped. Extract the
// displayable content the same way EventRenderer does.
let resultContent = event.content;
if (event.content.trimStart().startsWith("{")) {
try {
const parsed = JSON.parse(event.content) as Record<string, unknown>;
Eif (typeof parsed.content === "string") {
resultContent = parsed.content;
}
} catch {
/* use as-is */
}
}
return resultContent;
}
case "tool_use": {
// Show the tool name and args in a readable form
try {
const parsed = JSON.parse(event.content) as { tool?: string; args?: unknown };
const tool = parsed.tool ?? "tool";
const args = parsed.args !== undefined ? JSON.stringify(parsed.args, undefined, 2) : "";
return `${tool}\n${args}`;
} catch {
return event.content;
}
}
default:
return event.content;
}
}
/** Extracts a one-line args summary for tool events (e.g. file path, command). */
function toolArgsSummary(args: unknown): string {
Iif (args === null || args === undefined) {
return "";
}
Iif (typeof args !== "object") {
return String(args);
}
const obj = args as Record<string, unknown>;
// Common arg patterns across tool cards
if (typeof obj.command === "string") {
return `\`${obj.command}\``;
}
if (typeof obj.file_path === "string" || typeof obj.filePath === "string") {
return `\`${(obj.file_path ?? obj.filePath) as string}\``;
}
Iif (typeof obj.path === "string") {
return `\`${obj.path}\``;
}
Iif (typeof obj.query === "string") {
return `\`${obj.query}\``;
}
Iif (typeof obj.pattern === "string") {
return `\`${obj.pattern}\``;
}
return "";
}
/**
* Formats a list of events as well-structured markdown for clipboard copy.
*
* Each event gets a label and timestamp header, followed by its content.
* Events are separated by blank lines. Non-content-bearing events are skipped.
*/
export function formatEventsAsMarkdown(events: DisplayEvent[]): string {
const parts: string[] = [];
for (const event of events) {
if (!isContentBearingEvent(event)) {
continue;
}
const time = new Date(event.timestamp).toLocaleTimeString();
switch (event.eventType) {
case "text":
case "output": {
parts.push(`**Assistant** (${time}):\n${event.content}`);
break;
}
case "user_input":
case "turn_started": {
parts.push(`**User** (${time}):\n${event.content}`);
break;
}
case "tool_result": {
// Prefer detailedResult (e.g. Copilot unified diffs)
let resultContent = event.toolUseCtx?.detailedResult ?? undefined;
if (!resultContent) {
// Extract displayable content from JSON-wrapped results
resultContent = event.content;
Iif (event.content.trimStart().startsWith("{")) {
try {
const parsed = JSON.parse(event.content) as Record<string, unknown>;
if (typeof parsed.content === "string") {
resultContent = parsed.content;
}
} catch {
/* use as-is */
}
}
}
if (event.toolUseCtx) {
const summary = toolArgsSummary(event.toolUseCtx.args);
const label = summary
? `**Tool: ${event.toolUseCtx.tool}** ${summary}`
: `**Tool: ${event.toolUseCtx.tool}**`;
parts.push(`${label} (${time}):\n${resultContent}`);
} else {
parts.push(`**Tool output** (${time}):\n${resultContent}`);
}
break;
}
case "tool_use": {
let tool = "tool";
let args: unknown;
try {
const parsed = JSON.parse(event.content) as { tool?: string; args?: unknown };
tool = parsed.tool ?? "tool";
args = parsed.args;
} catch {
/* use defaults */
}
const summary = toolArgsSummary(args);
const label = summary ? `**Tool: ${tool}** ${summary}` : `**Tool: ${tool}**`;
if (args !== undefined) {
parts.push(
`${label} (${time}):\n\`\`\`json\n${JSON.stringify(args, undefined, 2)}\n\`\`\``,
);
} else E{
parts.push(`${label} (${time}):`);
}
break;
}
case "error": {
parts.push(`**Error** (${time}):\n${event.content}`);
break;
}
default:
break;
}
}
return parts.join("\n\n");
}
/**
* Wraps formatted event markdown in a forwarding envelope.
*
* The envelope identifies the source session and delimits the forwarded
* content so the receiving agent can distinguish it from new input.
*
* @param sourceLabel - A human-readable label for the source (e.g. environment name).
* @param events - The events to format and enclose.
* @returns The complete envelope string ready to pass to `sendInput`.
*/
export function formatForwardEnvelope(sourceLabel: string, events: DisplayEvent[]): string {
const safeLabel = sanitizeSourceLabel(sourceLabel);
const body = formatEventsAsMarkdown(events);
return `--- Forwarded from ${safeLabel} ---\n\n${body}\n\n--- End forwarded ---`;
}
/**
* Ensures a source label is a single line and cannot break envelope delimiters.
*
* Strips newlines and replaces `---` sequences with an em-dash so the label
* cannot be confused with the envelope's own `---` markers.
*/
function sanitizeSourceLabel(label: string): string {
return label
.replace(/[\r\n]+/g, " ")
.trim()
.replace(/---/g, "\u2014");
}
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