Function copyToClipboard

src/cli.ts:104–146

* Pipe text into the system clipboard via the platform-native command. * Returns null on success, or a short message describing why it failed. * Never throws — clipboard is best-effort.

(text: string)

 * Never throws — clipboard is best-effort.
 */
async function copyToClipboard(text: string): Promise<string | null> {
  const { spawn } = await import("node:child_process");
  const platform = process.platform;
  const candidates: Array<[string, string[]]> =
    platform === "darwin"
      ? [["pbcopy", []]]
      : platform === "win32"
        ? [["clip", []]]
        : [
            ["wl-copy", []],
            ["xclip", ["-selection", "clipboard"]],
            ["xsel", ["--clipboard", "--input"]],
          ];
  for (const [cmd, args] of candidates) {
    try {
      const child = spawn(cmd, args, { stdio: ["pipe", "ignore", "ignore"] });
      const ok = await new Promise<boolean>((resolve) => {
        let settled = false;
        child.on("error", () => {
          if (!settled) {
            settled = true;
            resolve(false);
          }
        });
        child.on("close", (code) => {
          if (!settled) {
            settled = true;
            resolve(code === 0);
          }
        });
        child.stdin.end(text, "utf8");
      });
      if (ok) return null;
    } catch {
      // try next candidate
    }
  }
  return platform === "darwin"
    ? "pbcopy not available"
    : platform === "win32"
      ? "clip.exe not available"
      : "no clipboard tool found (install xclip, xsel, or wl-clipboard)";
}

interface ShareEntry {
  id: string;