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📄 Source: tmux.php

<?php
/**
 * tmux helpers — capture console output, send commands.
 */

function tmux_session_name(string $template, string $server): string {
    return str_replace('%s', $server, $template);
}

function tmux_has_session(string $session): bool {
    $out = shell_exec('tmux has-session -t ' . escapeshellarg($session) . ' 2>&1');
    // has-session exits 0 if exists, 1 if not. shell_exec doesn't give us
    // the exit code, so we check stderr / empty output.
    // A cleaner way: use exec and inspect $code.
    $code = 1;
    exec('tmux has-session -t ' . escapeshellarg($session) . ' 2>/dev/null', $_, $code);
    return $code === 0;
}

function tmux_capture(string $session, int $lines = 300): ?string {
    if (!tmux_has_session($session)) {
        return null;
    }
    $cmd = 'tmux capture-pane -t ' . escapeshellarg($session) . ' -p -S -' . (int)$lines . ' 2>&1';
    return shell_exec($cmd);
}

function tmux_send_command(string $session, string $command): bool {
    if (!tmux_has_session($session)) {
        return false;
    }
    // Send the literal command, then Enter.
    $cmd = 'tmux send-keys -t ' . escapeshellarg($session) . ' '
         . escapeshellarg($command) . ' Enter';
    exec($cmd, $_, $code);
    return $code === 0;
}