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/**
* Minimal tmux extension for herdr integration testing.
*
* Two actions: send and read. No wait, no pane creation, no discovery loops.
* Talks directly to a pane tagged @pi_name=herdr.
*/
import type { ExtensionAPI } from "@mariozechner/pi-coding-agent";
import { StringEnum } from "@mariozechner/pi-ai";
import { Text } from "@mariozechner/pi-tui";
import { Type } from "@sinclair/typebox";
function stripAnsi(text: string): string {
return text
.replace(/\x1b\].*?(?:\x07|\x1b\\)/g, "")
.replace(/\x1bPtmux;.*?\x1b\\/g, "")
.replace(/\x1b\[[0-9;]*[a-zA-Z]/g, "")
.replace(/\x1b[^[\]P]/g, "")
.replace(/\r/g, "");
}
export default function (pi: ExtensionAPI) {
let herdrPaneId: string | null = null;
let windowId: string | null = null;
pi.on("session_start", async () => {
if (!process.env.TMUX) return;
try {
const winResult = await pi.exec("tmux", [
"display-message", "-p", "-t", process.env.TMUX_PANE || "",
"#{window_id}",
]);
if (winResult.code === 0) windowId = winResult.stdout.trim();
if (windowId) {
const listResult = await pi.exec("tmux", [
"list-panes", "-t", windowId,
"-F", "#{pane_id}\t#{@pi_name}",
]);
if (listResult.code === 0) {
for (const line of listResult.stdout.trim().split("\n")) {
const [paneId, name] = line.split("\t");
if (name === "herdr") {
herdrPaneId = paneId;
break;
}
}
}
}
} catch {}
});
pi.registerTool({
name: "herdr",
label: "herdr",
description:
"Interact with the herdr instance under test. " +
"Actions: send (send keys or text to herdr), read (capture herdr screen).",
parameters: Type.Object({
action: StringEnum(["send", "read"] as const, {
description: "Action: send or read",
}),
keys: Type.Optional(
Type.String({
description:
"Keys to send, space-separated (for send). Examples: C-s, Enter, n, v, Escape",
}),
),
text: Type.Optional(
Type.String({ description: "Literal text to type (for send). Sent as-is." }),
),
lines: Type.Optional(
Type.Number({ description: "Scrollback lines to capture (for read, default: 50)" }),
),
}),
async execute(_toolCallId, params) {
if (!herdrPaneId) {
throw new Error("herdr pane not found. Is herdr running in this tmux window?");
}
switch (params.action) {
case "send": {
if (!params.keys && !params.text) {
throw new Error("send requires 'keys' or 'text'");
}
if (params.text) {
await pi.exec("tmux", [
"send-keys", "-l", "-t", herdrPaneId, params.text,
]);
}
if (params.keys) {
const keyArgs = params.keys.split(/\s+/).filter(Boolean);
await pi.exec("tmux", [
"send-keys", "-t", herdrPaneId, ...keyArgs,
]);
}
const desc = [
params.text && `"${params.text}"`,
params.keys,
].filter(Boolean).join(" + ");
return {
content: [{ type: "text", text: `Sent: ${desc}` }],
};
}
case "read": {
const lines = params.lines ?? 50;
const result = await pi.exec("tmux", [
"capture-pane", "-t", herdrPaneId, "-p", "-S", `-${lines}`,
]);
if (result.code !== 0) {
throw new Error(`capture-pane failed: ${result.stderr}`);
}
let output = stripAnsi(result.stdout);
output = output.replace(/\n+$/, "\n");
return {
content: [{ type: "text", text: output }],
};
}
default:
throw new Error(`Unknown action: ${params.action}`);
}
},
renderCall(args, theme) {
const action = args.action || "?";
let t = theme.fg("toolTitle", theme.bold("herdr "));
t += theme.fg("accent", action);
if (args.text) t += theme.fg("dim", ` "${args.text}"`);
if (args.keys) t += theme.fg("dim", ` ${args.keys}`);
return new Text(t, 0, 0);
},
renderResult(result, _opts, theme) {
const c = result.content?.[0];
const text = c?.type === "text" ? c.text : "";
if (text.length > 200) {
return new Text(theme.fg("dim", text.slice(0, 200) + "…"), 0, 0);
}
return new Text(theme.fg("dim", text), 0, 0);
},
});
}
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