58 lines
1.8 KiB
TypeScript
58 lines
1.8 KiB
TypeScript
/**
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* tmux capture-pane snapshot.
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*
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* Returns a plain-text snapshot of a pane's visible content.
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* Used by the snapshot route (T-1.5) and the /thumbnail endpoint (T-1.6).
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*
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* Owner: T-1.1
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*/
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import { execFile } from "node:child_process";
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import { promisify } from "node:util";
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const execFileAsync = promisify(execFile);
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export interface SnapshotOptions {
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/** tmux session name */
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session: string;
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/** pane index within session (default "0.0") */
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pane?: string;
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/** capture width (default: actual pane width) */
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width?: number;
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/** capture height (default: actual pane height) */
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height?: number;
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/** include escape sequences for colour/style (default: false = plain text) */
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escapes?: boolean;
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}
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/**
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* Capture a plain-text (or escape-annotated) snapshot of a tmux pane.
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* Returns raw text as a string.
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*/
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export async function capturePane(opts: SnapshotOptions): Promise<string> {
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const { session, pane = "0.0", escapes = false } = opts;
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const target = `${session}:${pane}`;
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const args = ["capture-pane", "-t", target, "-p"];
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if (escapes) args.push("-e"); // include escape sequences
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// Note: -S/-E (start/end line) omitted — captures current visible content
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const { stdout } = await execFileAsync("tmux", args);
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return stdout;
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}
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/**
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* Capture a thumbnail-sized snapshot (40×12) for the REST thumbnail endpoint.
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* Returns plain text, trimmed.
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*/
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export async function captureThumbnail(
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session: string,
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pane = "0.0",
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): Promise<string> {
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// tmux can't resize the capture directly via capture-pane flags, so we
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// capture full content and truncate to 40-char wide × 12 lines.
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const raw = await capturePane({ session, pane, escapes: false });
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const lines = raw.split("\n").slice(0, 12);
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return lines.map((l) => l.slice(0, 40)).join("\n");
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}
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