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deepseek-harness/packages/pty/tool-pty/src/render.ts
T

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TypeScript

/** Model and ACP rendering for persistent terminal tool results. */
interface RenderedSessionStatusRunning {
kind: 'running'
}
interface RenderedSessionStatusExited {
kind: 'exited'
exitCode: number | null
signal: string | null
}
type RenderedSessionStatus = RenderedSessionStatusRunning | RenderedSessionStatusExited
interface RenderedSessionSnapshot {
sessionId: string
name?: string
type: string
pid?: number
status: RenderedSessionStatus
}
interface RenderedSpawnResult extends RenderedSessionSnapshot {
motd: string
}
interface RenderedSendResult {
viewport: string
waitReason: 'stdin_read' | 'inferred_idle' | 'timeout' | 'session_exit'
sessionStatus: RenderedSessionStatus
truncated: boolean
}
interface RenderedSendRead {
delta: string
truncated: boolean
}
interface RenderedReadResult {
text: string
totalLines: number
lineBegin: number
lineEnd: number
truncated: boolean
}
/**
* Render one created session and its bounded MOTD.
* @param result - published spawn result.
* @returns Model-facing session acknowledgement.
*/
export function renderSpawn(result: RenderedSpawnResult): string {
const label = result.name === undefined ? result.sessionId : `${result.sessionId} (${result.name})`
return `started terminal session ${label} [type: ${result.type}]\n${result.motd || '(no startup output)'}`
}
/**
* Render one settled interactive send.
* @param result - settled send outcome.
* @returns Terminal output plus wait/session markers.
*/
export function renderSend(result: RenderedSendResult): string {
const output = result.viewport || '(no new output)'
const status = result.sessionStatus.kind === 'running'
? 'running'
: `exited code=${result.sessionStatus.exitCode ?? 'null'} signal=${result.sessionStatus.signal ?? 'null'}`
return `${output}\n[wait: ${result.waitReason}]\n[session: ${status}]${result.truncated ? '\n[output truncated]' : ''}`
}
/**
* Render one incremental background operation read.
* @param read - consuming operation delta.
* @returns Delta plus truncation marker when needed.
*/
export function renderSendRead(read: RenderedSendRead): string {
return `${read.delta}${read.truncated ? `${read.delta.endsWith('\n') || read.delta.length === 0 ? '' : '\n'}[output truncated]` : ''}`
}
/**
* Render one bounded historical page.
* @param result - retained scrollback page.
* @returns Page text plus pagination and truncation markers.
*/
export function renderRead(result: RenderedReadResult): string {
const output = result.text || '(no retained output)'
return `${output}\n[lines: ${result.lineBegin}-${result.lineEnd} of ${result.totalLines}]${result.truncated ? '\n[output truncated]' : ''}`
}
/**
* Render owner-visible live sessions.
* @param sessions - fresh owner-scoped snapshots.
* @returns One line per session or the empty marker.
*/
export function renderList(sessions: readonly RenderedSessionSnapshot[]): string {
if (sessions.length === 0) return '(no terminal sessions)'
return sessions.map((session) => {
const name = session.name === undefined ? '' : ` (${session.name})`
const pid = session.pid === undefined ? '' : ` pid=${session.pid}`
const status = session.status.kind === 'running'
? 'running'
: `exited code=${session.status.exitCode ?? 'null'} signal=${session.status.signal ?? 'null'}`
return `${session.sessionId}${name} [${session.type}] ${status}${pid}`
}).join('\n')
}