Merge main into terminal drag-drop zmodem

lib/zmodemDragDrop.ts

@@ -2,6 +2,9 @@ import type { DropEntry } from "./sftpFileUtils";
 import { getPathForFile } from "./sftpFileUtils";
 import type { Host } from "../types";
 
+const ZMODEM_RZ_MISSING_MARKER_PREFIX = "\x1b]1337;NetcattyRzMissing=";
+const ZMODEM_RZ_MISSING_MARKER_SUFFIX = "\x07";
+
 export type ZmodemDragDropFile = {
   path?: string;
   name: string;
@@ -18,12 +21,14 @@ export function supportsZmodemTerminalDragDrop(
   return (
     host.protocol === "ssh" ||
     host.protocol === "telnet" ||
-    host.protocol === "mosh" ||
-    host.protocol === "et" ||
     host.protocol === "serial"
   );
 }
 
+export function supportsZmodemDragDropSftpFallback(host: Host): boolean {
+  return host.protocol === "ssh" || Boolean(host.moshEnabled || host.etEnabled);
+}
+
 export function getZmodemRemoteName(relativePath: string, fallbackName: string): string {
   const normalized = relativePath.replace(/\\/g, "/").replace(/^\/+/, "");
   if (!normalized) return fallbackName;
@@ -31,6 +36,24 @@ export function getZmodemRemoteName(relativePath: string, fallbackName: string):
   return segments[segments.length - 1] || fallbackName;
 }
 
+function quotePosixShellArg(value: string): string {
+  return `'${value.replace(/'/g, "'\\''")}'`;
+}
+
+export function createZmodemRzMissingToken(): string {
+  return `rz-${Date.now().toString(36)}-${Math.random().toString(36).slice(2)}`;
+}
+
+export function buildZmodemDragDropUploadCommand(rzMissingToken: string): string {
+  const markerFormat = `\\033]1337;NetcattyRzMissing=${rzMissingToken}\\007`;
+  const script = `if command -v rz >/dev/null 2>&1; then exec rz; else printf ${quotePosixShellArg(markerFormat)}; fi`;
+  return `sh -lc ${quotePosixShellArg(script)}\r`;
+}
+
+export function containsZmodemRzMissingMarker(chunk: string, rzMissingToken: string): boolean {
+  return chunk.includes(`${ZMODEM_RZ_MISSING_MARKER_PREFIX}${rzMissingToken}${ZMODEM_RZ_MISSING_MARKER_SUFFIX}`);
+}
+
 export async function buildZmodemDragDropFiles(
   dropEntries: DropEntry[],
 ): Promise<ZmodemDragDropFile[]> {