modules/download-manager.js

   1 /**
   2  * (C) Copyright 2008 Jeremy Maitin-Shepard
   3  * (C) Copyright 2009 John Foerch
   4  *
   5  * Use, modification, and distribution are subject to the terms specified in the
   6  * COPYING file.
   7 **/
   8
   9 require("special-buffer.js");
  10 require("mime-type-override.js");
  11 require("minibuffer-read-mime-type.js");
  12
  13 var download_manager_service = Cc["@mozilla.org/download-manager;1"]
  14     .getService(Ci.nsIDownloadManager);
  15
  16 var unmanaged_download_info_list = [];
  17 var id_to_download_info = {};
  18
  19 // Import these constants for convenience
  20 const DOWNLOAD_NOTSTARTED = Ci.nsIDownloadManager.DOWNLOAD_NOTSTARTED;
  21 const DOWNLOAD_DOWNLOADING = Ci.nsIDownloadManager.DOWNLOAD_DOWNLOADING;
  22 const DOWNLOAD_FINISHED = Ci.nsIDownloadManager.DOWNLOAD_FINISHED;
  23 const DOWNLOAD_FAILED = Ci.nsIDownloadManager.DOWNLOAD_FAILED;
  24 const DOWNLOAD_CANCELED = Ci.nsIDownloadManager.DOWNLOAD_CANCELED;
  25 const DOWNLOAD_PAUSED = Ci.nsIDownloadManager.DOWNLOAD_PAUSED;
  26 const DOWNLOAD_QUEUED = Ci.nsIDownloadManager.DOWNLOAD_QUEUED;
  27 const DOWNLOAD_BLOCKED = Ci.nsIDownloadManager.DOWNLOAD_BLOCKED;
  28 const DOWNLOAD_SCANNING = Ci.nsIDownloadManager.DOWNLOAD_SCANNING;
  29
  30
  31 const DOWNLOAD_NOT_TEMPORARY = 0;
  32 const DOWNLOAD_TEMPORARY_FOR_ACTION = 1;
  33 const DOWNLOAD_TEMPORARY_FOR_COMMAND = 2;
  34
  35 function download_info (source_buffer, mozilla_info, target_file) {
  36     this.source_buffer = source_buffer;
  37     this.target_file = target_file;
  38     if (mozilla_info != null)
  39         this.attach(mozilla_info);
  40 }
  41 download_info.prototype = {
  42     constructor: download_info,
  43     attach: function (mozilla_info) {
  44         if (!this.target_file)
  45             this.__defineGetter__("target_file", function () {
  46                     return this.mozilla_info.targetFile;
  47                 });
  48         else if (this.target_file.path != mozilla_info.targetFile.path)
  49             throw interactive_error("Download target file unexpected.");
  50         this.mozilla_info = mozilla_info;
  51         id_to_download_info[mozilla_info.id] = this;
  52         download_added_hook.run(this);
  53     },
  54     target_file: null,
  55     shell_command: null,
  56     shell_command_cwd: null,
  57     temporary_status: DOWNLOAD_NOT_TEMPORARY,
  58     action_description: null,
  59     set_shell_command: function (str, cwd) {
  60         this.shell_command = str;
  61         this.shell_command_cwd = cwd;
  62         if (this.mozilla_info)
  63             download_shell_command_change_hook.run(this);
  64     },
  65
  66     /**
  67      * None of the following members may be used until attach is called
  68      */
  69
  70     // Reflectors to properties of nsIDownload
  71     get state () { return this.mozilla_info.state; },
  72     get display_name () { return this.mozilla_info.displayName; },
  73     get amount_transferred () { return this.mozilla_info.amountTransferred; },
  74     get percent_complete () { return this.mozilla_info.percentComplete; },
  75     get size () {
  76         var s = this.mozilla_info.size;
  77         /* nsIDownload.size is a PRUint64, and will have value
  78          * LL_MAXUINT (2^64 - 1) to indicate an unknown size.  Because
  79          * JavaScript only has a double numerical type, this value
  80          * cannot be represented exactly, so 2^36 is used instead as the cutoff. */
  81         if (s < 68719476736 /* 2^36 */)
  82             return s;
  83         return -1;
  84     },
  85     get source () { return this.mozilla_info.source; },
  86     get start_time () { return this.mozilla_info.startTime; },
  87     get speed () { return this.mozilla_info.speed; },
  88     get MIME_info () { return this.mozilla_info.MIMEInfo; },
  89     get MIME_type () {
  90         if (this.MIME_info)
  91             return this.MIME_info.MIMEType;
  92         return null;
  93     },
  94     get id () { return this.mozilla_info.id; },
  95     get referrer () { return this.mozilla_info.referrer; },
  96
  97     target_file_text: function () {
  98         let target = this.target_file.path;
  99         let display = this.display_name;
 100         if (target.indexOf(display, target.length - display.length) == -1)
 101             target += " (" + display + ")";
 102         return target;
 103     },
 104
 105     throw_if_removed: function () {
 106         if (this.removed)
 107             throw interactive_error("Download has already been removed from the download manager.");
 108     },
 109
 110     throw_state_error: function () {
 111         switch (this.state) {
 112         case DOWNLOAD_DOWNLOADING:
 113             throw interactive_error("Download is already in progress.");
 114         case DOWNLOAD_FINISHED:
 115             throw interactive_error("Download has already completed.");
 116         case DOWNLOAD_FAILED:
 117             throw interactive_error("Download has already failed.");
 118         case DOWNLOAD_CANCELED:
 119             throw interactive_error("Download has already been canceled.");
 120         case DOWNLOAD_PAUSED:
 121             throw interactive_error("Download has already been paused.");
 122         case DOWNLOAD_QUEUED:
 123             throw interactive_error("Download is queued.");
 124         default:
 125             throw new Error("Download has unexpected state: " + this.state);
 126         }
 127     },
 128
 129     // Download manager operations
 130     cancel: function ()  {
 131         this.throw_if_removed();
 132         switch (this.state) {
 133         case DOWNLOAD_DOWNLOADING:
 134         case DOWNLOAD_PAUSED:
 135         case DOWNLOAD_QUEUED:
 136             try {
 137                 download_manager_service.cancelDownload(this.id);
 138             } catch (e) {
 139                 throw interactive_error("Download cannot be canceled.");
 140             }
 141             break;
 142         default:
 143             this.throw_state_error();
 144         }
 145     },
 146
 147     retry: function () {
 148         this.throw_if_removed();
 149         switch (this.state) {
 150         case DOWNLOAD_CANCELED:
 151         case DOWNLOAD_FAILED:
 152             try {
 153                 download_manager_service.retryDownload(this.id);
 154             } catch (e) {
 155                 throw interactive_error("Download cannot be retried.");
 156             }
 157             break;
 158         default:
 159             this.throw_state_error();
 160         }
 161     },
 162
 163     resume: function () {
 164         this.throw_if_removed();
 165         switch (this.state) {
 166         case DOWNLOAD_PAUSED:
 167             try {
 168                 download_manager_service.resumeDownload(this.id);
 169             } catch (e) {
 170                 throw interactive_error("Download cannot be resumed.");
 171             }
 172             break;
 173         default:
 174             this.throw_state_error();
 175         }
 176     },
 177
 178     pause: function () {
 179         this.throw_if_removed();
 180         switch (this.state) {
 181         case DOWNLOAD_DOWNLOADING:
 182         case DOWNLOAD_QUEUED:
 183             try {
 184                 download_manager_service.pauseDownload(this.id);
 185             } catch (e) {
 186                 throw interactive_error("Download cannot be paused.");
 187             }
 188             break;
 189         default:
 190             this.throw_state_error();
 191         }
 192     },
 193
 194     remove: function () {
 195         this.throw_if_removed();
 196         switch (this.state) {
 197         case DOWNLOAD_FAILED:
 198         case DOWNLOAD_CANCELED:
 199         case DOWNLOAD_FINISHED:
 200             try {
 201                 download_manager_service.removeDownload(this.id);
 202             } catch (e) {
 203                 throw interactive_error("Download cannot be removed.");
 204             }
 205             break;
 206         default:
 207             throw interactive_error("Download is still in progress.");
 208         }
 209     },
 210
 211     delete_target: function () {
 212         if (this.state != DOWNLOAD_FINISHED)
 213             throw interactive_error("Download has not finished.");
 214         try {
 215             this.target_file.remove(false);
 216         } catch (e) {
 217             if ("result" in e) {
 218                 switch (e.result) {
 219                 case Cr.NS_ERROR_FILE_TARGET_DOES_NOT_EXIST:
 220                     throw interactive_error("File has already been deleted.");
 221                 case Cr.NS_ERROR_FILE_ACCESS_DENIED:
 222                     throw interactive_error("Access denied");
 223                 case Cr.NS_ERROR_FILE_DIR_NOT_EMPTY:
 224                     throw interactive_error("Failed to delete file.");
 225                 }
 226             }
 227             throw e;
 228         }
 229     }
 230 };
 231
 232 var define_download_local_hook = simple_local_hook_definer();
 233
 234 function register_download (buffer, source_uri, target_file) {
 235     var info = new download_info(buffer, null, target_file);
 236     info.registered_time_stamp = Date.now();
 237     info.registered_source_uri = source_uri;
 238     unmanaged_download_info_list.push(info);
 239     return info;
 240 }
 241
 242 function match_registered_download (mozilla_info) {
 243     let list = unmanaged_download_info_list;
 244     let t = Date.now();
 245     for (let i = 0; i < list.length; ++i) {
 246         let x = list[i];
 247         if (x.registered_source_uri == mozilla_info.source) {
 248             list.splice(i, 1);
 249             return x;
 250         }
 251         if (t - x.registered_time_stamp > download_info_max_queue_delay) {
 252             list.splice(i, 1);
 253             --i;
 254             continue;
 255         }
 256     }
 257     return null;
 258 }
 259
 260 define_download_local_hook("download_added_hook");
 261 define_download_local_hook("download_removed_hook");
 262 define_download_local_hook("download_finished_hook");
 263 define_download_local_hook("download_progress_change_hook");
 264 define_download_local_hook("download_state_change_hook");
 265 define_download_local_hook("download_shell_command_change_hook");
 266
 267 define_variable('delete_temporary_files_for_command', true,
 268     'If this is set to true, temporary files downloaded to run a command '+
 269     'on them will be deleted once the command completes. If not, the file '+
 270     'will stay around forever unless deleted outside the browser.');
 271
 272 var download_info_max_queue_delay = 100;
 273
 274 var download_progress_listener = {
 275     QueryInterface: generate_QI(Ci.nsIDownloadProgressListener),
 276
 277     onDownloadStateChange: function (state, download) {
 278         var info = null;
 279         /* FIXME: Determine if only new downloads will have this state
 280          * as their previous state. */
 281
 282         dumpln("download state change: " + download.source.spec + ": " + state + ", " + download.state + ", " + download.id);
 283
 284         if (state == DOWNLOAD_NOTSTARTED) {
 285             info = match_registered_download(download);
 286             if (info == null) {
 287                 info = new download_info(null, download);
 288                 dumpln("error: encountered unknown new download");
 289             } else {
 290                 info.attach(download);
 291             }
 292         } else {
 293             info = id_to_download_info[download.id];
 294             if (info == null) {
 295                 dumpln("Error: encountered unknown download");
 296
 297             } else {
 298                 info.mozilla_info = download;
 299                 download_state_change_hook.run(info);
 300                 if (info.state == DOWNLOAD_FINISHED) {
 301                     download_finished_hook.run(info);
 302
 303                     if (info.shell_command != null) {
 304                         info.running_shell_command = true;
 305                         co_call(function () {
 306                             try {
 307                                 yield shell_command_with_argument(info.shell_command,
 308                                                                   info.target_file.path,
 309                                                                   $cwd = info.shell_command_cwd);
 310                             } catch (e) {
 311                                 handle_interactive_error(info.source_buffer.window, e);
 312                             } finally  {
 313                                 if (info.temporary_status == DOWNLOAD_TEMPORARY_FOR_COMMAND)
 314                                     if(delete_temporary_files_for_command) {
 315                                         info.target_file.remove(false /* not recursive */);
 316                                     }
 317                                 info.running_shell_command = false;
 318                                 download_shell_command_change_hook.run(info);
 319                             }
 320                         }());
 321                         download_shell_command_change_hook.run(info);
 322                     }
 323                 }
 324             }
 325         }
 326     },
 327
 328     onProgressChange: function (progress, request, cur_self_progress, max_self_progress,
 329                                 cur_total_progress, max_total_progress,
 330                                 download) {
 331         var info = id_to_download_info[download.id];
 332         if (info == null) {
 333             dumpln("error: encountered unknown download in progress change");
 334             return;
 335         }
 336         info.mozilla_info = download;
 337         download_progress_change_hook.run(info);
 338         //dumpln("download progress change: " + download.source.spec + ": " + cur_self_progress + "/" + max_self_progress + " "
 339         // + cur_total_progress + "/" + max_total_progress + ", " + download.state + ", " + download.id);
 340     },
 341
 342     onSecurityChange: function (progress, request, state, download) {
 343     },
 344
 345     onStateChange: function (progress, request, state_flags, status, download) {
 346     }
 347 };
 348
 349 var download_observer = {
 350     observe: function (subject, topic, data) {
 351         switch(topic) {
 352         case "download-manager-remove-download":
 353             var ids = [];
 354             if (!subject) {
 355                 // Remove all downloads
 356                 for (let i in id_to_download_info)
 357                     ids.push(i);
 358             } else {
 359                 let id = subject.QueryInterface(Ci.nsISupportsPRUint32);
 360                 /* FIXME: determine if this should really be an error */
 361                 if (!(id in id_to_download_info)) {
 362                     dumpln("Error: download-manager-remove-download event received for unknown download: " + id);
 363                 } else
 364                     ids.push(id);
 365             }
 366             for each (let i in ids) {
 367                 dumpln("deleting download: " + i);
 368                 let d = id_to_download_info[i];
 369                 d.removed = true;
 370                 download_removed_hook.run(d);
 371                 delete id_to_download_info[i];
 372             }
 373             break;
 374         }
 375     }
 376 };
 377 observer_service.addObserver(download_observer, "download-manager-remove-download", false);
 378
 379 download_manager_service.addListener(download_progress_listener);
 380
 381 define_variable("download_buffer_min_update_interval", 2000,
 382     "Minimum interval (in milliseconds) between updates in download progress buffers.\n" +
 383     "Lowering this interval will increase the promptness of the progress display at " +
 384     "the cost of using additional processor time.");
 385
 386 function download_buffer_modality (buffer, element) {
 387     buffer.keymaps.push(download_buffer_keymap);
 388 }
 389
 390 define_keywords("$info");
 391 function download_buffer (window) {
 392     this.constructor_begin();
 393     keywords(arguments);
 394     special_buffer.call(this, window, forward_keywords(arguments));
 395     this.info = arguments.$info;
 396     this.local.cwd = this.info.mozilla_info.targetFile.parent;
 397     this.description = this.info.mozilla_info.source.spec;
 398     this.update_title();
 399
 400     this.progress_change_handler_fn = method_caller(this, this.handle_progress_change);
 401     add_hook.call(this.info, "download_progress_change_hook", this.progress_change_handler_fn);
 402     add_hook.call(this.info, "download_state_change_hook", this.progress_change_handler_fn);
 403     this.command_change_handler_fn = method_caller(this, this.update_command_field);
 404     add_hook.call(this.info, "download_shell_command_change_hook", this.command_change_handler_fn);
 405     this.modalities.push(download_buffer_modality);
 406     this.constructor_end();
 407 }
 408 download_buffer.prototype = {
 409     constructor: download_buffer,
 410     __proto__: special_buffer.prototype,
 411
 412     destroy: function () {
 413         remove_hook.call(this.info, "download_progress_change_hook", this.progress_change_handler_fn);
 414         remove_hook.call(this.info, "download_state_change_hook", this.progress_change_handler_fn);
 415         remove_hook.call(this.info, "download_shell_command_change_hook", this.command_change_handler_fn);
 416
 417         // Remove all node references
 418         delete this.status_textnode;
 419         delete this.target_file_node;
 420         delete this.transferred_div_node;
 421         delete this.transferred_textnode;
 422         delete this.progress_container_node;
 423         delete this.progress_bar_node;
 424         delete this.percent_textnode;
 425         delete this.time_textnode;
 426         delete this.command_div_node;
 427         delete this.command_label_textnode;
 428         delete this.command_textnode;
 429
 430         special_buffer.prototype.destroy.call(this);
 431     },
 432
 433     update_title: function () {
 434         // FIXME: do this properly
 435         var new_title;
 436         var info = this.info;
 437         var append_transfer_info = false;
 438         var append_speed_info = true;
 439         var label = null;
 440         switch(info.state) {
 441         case DOWNLOAD_DOWNLOADING:
 442             label = "Downloading";
 443             append_transfer_info = true;
 444             break;
 445         case DOWNLOAD_FINISHED:
 446             label = "Download complete";
 447             break;
 448         case DOWNLOAD_FAILED:
 449             label = "Download failed";
 450             append_transfer_info = true;
 451             append_speed_info = false;
 452             break;
 453         case DOWNLOAD_CANCELED:
 454             label = "Download canceled";
 455             append_transfer_info = true;
 456             append_speed_info = false;
 457             break;
 458         case DOWNLOAD_PAUSED:
 459             label = "Download paused";
 460             append_transfer_info = true;
 461             append_speed_info = false;
 462             break;
 463         case DOWNLOAD_QUEUED:
 464         default:
 465             label = "Download queued";
 466             break;
 467         }
 468
 469         if (append_transfer_info) {
 470             if (append_speed_info)
 471                 new_title = label + " at " + pretty_print_file_size(info.speed).join(" ") + "/s: ";
 472             else
 473                 new_title = label + ": ";
 474             var trans = pretty_print_file_size(info.amount_transferred);
 475             if (info.size >= 0) {
 476                 var total = pretty_print_file_size(info.size);
 477                 if (trans[1] == total[1])
 478                     new_title += trans[0] + "/" + total[0] + " " + total[1];
 479                 else
 480                     new_title += trans.join(" ") + "/" + total.join(" ");
 481             } else
 482                 new_title += trans.join(" ");
 483             if (info.percent_complete >= 0)
 484                 new_title += " (" + info.percent_complete + "%)";
 485         } else
 486             new_title = label;
 487         if (new_title != this.title) {
 488             this.title = new_title;
 489             return true;
 490         }
 491         return false;
 492     },
 493
 494     handle_progress_change: function () {
 495         var cur_time = Date.now();
 496         if (this.last_update == null ||
 497             (cur_time - this.last_update) > download_buffer_min_update_interval ||
 498             this.info.state != this.previous_state) {
 499
 500             if (this.update_title())
 501                 buffer_title_change_hook.run(this);
 502
 503             if (this.generated) {
 504                 this.update_fields();
 505             }
 506             this.previous_status = this.info.status;
 507             this.last_update = cur_time;
 508         }
 509     },
 510
 511     generate: function () {
 512         var d = this.document;
 513         var g = new dom_generator(d, XHTML_NS);
 514
 515         /* Warning: If any additional node references are saved in
 516          * this function, appropriate code to delete the saved
 517          * properties must be added to destroy method. */
 518
 519         var info = this.info;
 520
 521         d.body.setAttribute("class", "download-buffer");
 522
 523         g.add_stylesheet("chrome://conkeror-gui/content/downloads.css");
 524
 525         var row, cell;
 526         var table = g.element("table", d.body);
 527
 528         row = g.element("tr", table, "class", "download-info", "id", "download-source");
 529         cell = g.element("td", row, "class", "download-label");
 530         this.status_textnode = g.text("", cell);
 531         cell = g.element("td", row, "class", "download-value");
 532         g.text(info.source.spec, cell);
 533
 534         row = g.element("tr", table, "class", "download-info", "id", "download-target");
 535         cell = g.element("td", row, "class", "download-label");
 536         var target_label;
 537         if (info.temporary_status != DOWNLOAD_NOT_TEMPORARY)
 538             target_label = "Temp. file:";
 539         else
 540             target_label = "Target:";
 541         g.text(target_label, cell);
 542         cell = g.element("td", row, "class", "download-value");
 543         this.target_file_node = g.text("", cell);
 544
 545         row = g.element("tr", table, "class", "download-info", "id", "download-mime-type");
 546         cell = g.element("td", row, "class", "download-label");
 547         g.text("MIME type:", cell);
 548         cell = g.element("td", row, "class", "download-value");
 549         g.text(info.MIME_type || "unknown", cell);
 550
 551         this.transferred_div_node = row =
 552             g.element("tr", table, "class", "download-info", "id", "download-transferred");
 553         cell = g.element("td", row, "class", "download-label");
 554         g.text("Transferred:", cell);
 555         cell = g.element("td", row, "class", "download-value");
 556         var sub_item = g.element("div", cell);
 557         this.transferred_textnode = g.text("", sub_item);
 558         sub_item = g.element("div", cell, "id", "download-percent");
 559         this.percent_textnode = g.text("", sub_item);
 560         this.progress_container_node = sub_item = g.element("div", cell, "id", "download-progress-container");
 561         this.progress_bar_node = g.element("div", sub_item, "id", "download-progress-bar");
 562
 563         row = g.element("tr", table, "class", "download-info", "id", "download-time");
 564         cell = g.element("td", row, "class", "download-label");
 565         g.text("Time:", cell);
 566         cell = g.element("td", row, "class", "download-value");
 567         this.time_textnode = g.text("", cell);
 568
 569         if (info.action_description != null) {
 570             row = g.element("tr", table, "class", "download-info", "id", "download-action");
 571             cell = g.element("div", row, "class", "download-label");
 572             g.text("Action:", cell);
 573             cell = g.element("div", row, "class", "download-value");
 574             g.text(info.action_description, cell);
 575         }
 576
 577         this.command_div_node = row = g.element("tr", table, "class", "download-info", "id", "download-command");
 578         cell = g.element("td", row, "class", "download-label");
 579         this.command_label_textnode = g.text("Run command:", cell);
 580         cell = g.element("td", row, "class", "download-value");
 581         this.command_textnode = g.text("", cell);
 582
 583         this.update_fields();
 584         this.update_command_field();
 585     },
 586
 587     update_fields: function () {
 588         if (!this.generated)
 589             return;
 590         var info = this.info;
 591         var label = null;
 592         switch (info.state) {
 593         case DOWNLOAD_DOWNLOADING:
 594             label = "Downloading";
 595             break;
 596         case DOWNLOAD_FINISHED:
 597             label = "Completed";
 598             break;
 599         case DOWNLOAD_FAILED:
 600             label = "Failed";
 601             break;
 602         case DOWNLOAD_CANCELED:
 603             label = "Canceled";
 604             break;
 605         case DOWNLOAD_PAUSED:
 606             label = "Paused";
 607             break;
 608         case DOWNLOAD_QUEUED:
 609         default:
 610             label = "Queued";
 611             break;
 612         }
 613         this.status_textnode.nodeValue = label + ":";
 614         this.target_file_node.nodeValue = info.target_file_text();
 615         this.update_time_field();
 616
 617         var tran_text = "";
 618         if (info.state == DOWNLOAD_FINISHED)
 619             tran_text = pretty_print_file_size(info.size).join(" ");
 620         else {
 621             var trans = pretty_print_file_size(info.amount_transferred);
 622             if (info.size >= 0) {
 623                 var total = pretty_print_file_size(info.size);
 624                 if (trans[1] == total[1])
 625                     tran_text += trans[0] + "/" + total[0] + " " + total[1];
 626                 else
 627                     tran_text += trans.join(" ") + "/" + total.join(" ");
 628             } else
 629                 tran_text += trans.join(" ");
 630         }
 631         this.transferred_textnode.nodeValue = tran_text;
 632         if (info.percent_complete >= 0) {
 633             this.progress_container_node.style.display = "";
 634             this.percent_textnode.nodeValue = info.percent_complete + "%";
 635             this.progress_bar_node.style.width = info.percent_complete + "%";
 636         } else {
 637             this.percent_textnode.nodeValue = "";
 638             this.progress_container_node.style.display = "none";
 639         }
 640
 641         this.update_command_field();
 642     },
 643
 644     update_time_field: function () {
 645         var info = this.info;
 646         var elapsed_text = pretty_print_time((Date.now() - info.start_time / 1000) / 1000) + " elapsed";
 647         var text = "";
 648         if (info.state == DOWNLOAD_DOWNLOADING)
 649             text = pretty_print_file_size(info.speed).join(" ") + "/s, ";
 650         if (info.state == DOWNLOAD_DOWNLOADING &&
 651             info.size >= 0 &&
 652             info.speed > 0)
 653         {
 654             let remaining = (info.size - info.amount_transferred) / info.speed;
 655             text += pretty_print_time(remaining) + " left (" + elapsed_text + ")";
 656         } else
 657             text = elapsed_text;
 658         this.time_textnode.nodeValue = text;
 659     },
 660
 661     update_command_field: function () {
 662         if (!this.generated)
 663             return;
 664         if (this.info.shell_command != null) {
 665             this.command_div_node.style.display = "";
 666             var label;
 667             if (this.info.running_shell_command)
 668                 label = "Running:";
 669             else if (this.info.state == DOWNLOAD_FINISHED)
 670                 label = "Ran command:";
 671             else
 672                 label = "Run command:";
 673             this.command_label_textnode.nodeValue = label;
 674             this.command_textnode.nodeValue = this.info.shell_command;
 675         } else
 676             this.command_div_node.style.display = "none";
 677     }
 678 };
 679
 680 function download_cancel (buffer) {
 681     check_buffer(buffer, download_buffer);
 682     var info = buffer.info;
 683     info.cancel();
 684     buffer.window.minibuffer.message("Download canceled");
 685 }
 686 interactive("download-cancel",
 687     "Cancel the current download.\n" +
 688     "The download can later be retried using the `download-retry' "+
 689     "command, but any data already transferred will be lost.",
 690     function (I) {
 691         let result = yield I.window.minibuffer.read_single_character_option(
 692             $prompt = "Cancel this download? (y/n)",
 693             $options = ["y", "n"]);
 694         if (result == "y")
 695             download_cancel(I.buffer);
 696     });
 697
 698 function download_retry (buffer) {
 699     check_buffer(buffer, download_buffer);
 700     var info = buffer.info;
 701     info.retry();
 702     buffer.window.minibuffer.message("Download retried");
 703 }
 704 interactive("download-retry",
 705     "Retry a failed or canceled download.\n" +
 706     "This command can be used to retry a download that failed or "+
 707     "was canceled using the `download-cancel' command.  The download "+
 708     "will begin from the start again.",
 709     function (I) { download_retry(I.buffer); });
 710
 711 function download_pause (buffer) {
 712     check_buffer(buffer, download_buffer);
 713     buffer.info.pause();
 714     buffer.window.minibuffer.message("Download paused");
 715 }
 716 interactive("download-pause",
 717     "Pause the current download.\n" +
 718     "The download can later be resumed using the `download-resume' command. "+
 719     "The data already transferred will not be lost.",
 720     function (I) { download_pause(I.buffer); });
 721
 722 function download_resume (buffer) {
 723     check_buffer(buffer, download_buffer);
 724     buffer.info.resume();
 725     buffer.window.minibuffer.message("Download resumed");
 726 }
 727 interactive("download-resume",
 728     "Resume the current download.\n" +
 729     "This command can be used to resume a download paused using the "+
 730     "`download-pause' command.",
 731     function (I) { download_resume(I.buffer); });
 732
 733 function download_remove (buffer) {
 734     check_buffer(buffer, download_buffer);
 735     buffer.info.remove();
 736     buffer.window.minibuffer.message("Download removed");
 737 }
 738 interactive("download-remove",
 739     "Remove the current download from the download manager.\n" +
 740     "This command can only be used on inactive (paused, canceled, "+
 741     "completed, or failed) downloads.",
 742     function (I) { download_remove(I.buffer); });
 743
 744 function download_retry_or_resume (buffer) {
 745     check_buffer(buffer, download_buffer);
 746     var info = buffer.info;
 747     if (info.state == DOWNLOAD_PAUSED)
 748         download_resume(buffer);
 749     else
 750         download_retry(buffer);
 751 }
 752 interactive("download-retry-or-resume",
 753     "Retry or resume the current download.\n" +
 754     "This command can be used to resume a download paused using the " +
 755     "`download-pause' command or canceled using the `download-cancel' "+
 756     "command.",
 757     function (I) { download_retry_or_resume(I.buffer); });
 758
 759 function download_pause_or_resume (buffer) {
 760     check_buffer(buffer, download_buffer);
 761     var info = buffer.info;
 762     if (info.state == DOWNLOAD_PAUSED)
 763         download_resume(buffer);
 764     else
 765         download_pause(buffer);
 766 }
 767 interactive("download-pause-or-resume",
 768     "Pause or resume the current download.\n" +
 769     "This command toggles the paused state of the current download.",
 770     function (I) { download_pause_or_resume(I.buffer); });
 771
 772 function download_delete_target (buffer) {
 773     check_buffer(buffer, download_buffer);
 774     var info = buffer.info;
 775     info.delete_target();
 776     buffer.window.minibuffer.message("Deleted file: " + info.target_file.path);
 777 }
 778 interactive("download-delete-target",
 779     "Delete the target file of the current download.\n" +
 780     "This command can only be used if the download has finished successfully.",
 781     function (I) { download_delete_target(I.buffer); });
 782
 783 function download_shell_command (buffer, cwd, cmd) {
 784     check_buffer(buffer, download_buffer);
 785     var info = buffer.info;
 786     if (info.state == DOWNLOAD_FINISHED) {
 787         shell_command_with_argument_blind(cmd, info.target_file.path, $cwd = cwd);
 788         return;
 789     }
 790     if (info.state != DOWNLOAD_DOWNLOADING && info.state != DOWNLOAD_PAUSED && info.state != DOWNLOAD_QUEUED)
 791         info.throw_state_error();
 792     if (cmd == null || cmd.length == 0)
 793         info.set_shell_command(null, cwd);
 794     else
 795         info.set_shell_command(cmd, cwd);
 796     buffer.window.minibuffer.message("Queued shell command: " + cmd);
 797 }
 798 interactive("download-shell-command",
 799     "Run a shell command on the target file of the current download.\n"+
 800     "If the download is still in progress, the shell command will be queued "+
 801     "to run when the download finishes.",
 802     function (I) {
 803         var buffer = check_buffer(I.buffer, download_buffer);
 804         var cwd = buffer.info.shell_command_cwd || I.local.cwd;
 805         var cmd = yield I.minibuffer.read_shell_command(
 806             $cwd = cwd,
 807             $initial_value = buffer.info.shell_command ||
 808                 external_content_handlers.get(buffer.info.MIME_type));
 809         download_shell_command(buffer, cwd, cmd);
 810     });
 811
 812 function download_manager_ui () {}
 813 download_manager_ui.prototype = {
 814     constructor: download_manager_ui,
 815     QueryInterface: XPCOMUtils.generateQI([Ci.nsIDownloadManagerUI]),
 816
 817     getAttention: function () {},
 818     show: function () {},
 819     visible: false
 820 };
 821
 822
 823 interactive("download-manager-show-builtin-ui",
 824     "Show the built-in (Firefox-style) download manager window.",
 825     function (I) {
 826         Components.classesByID["{7dfdf0d1-aff6-4a34-bad1-d0fe74601642}"]
 827             .getService(Ci.nsIDownloadManagerUI)
 828             .show(I.window);
 829     });
 830
 831
 832 /*
 833  * Download-show
 834  */
 835
 836 define_variable("download_temporary_file_open_buffer_delay", 500,
 837     "Delay (in milliseconds) before a download buffer is opened for "+
 838     "temporary downloads.  If the download completes before this amount "+
 839     "of time, no download buffer will be opened.  This variable takes "+
 840     "effect only if `open_download_buffer_automatically' is in "+
 841     "`download_added_hook', which is the case by default.");
 842
 843 define_variable("download_buffer_automatic_open_target", OPEN_NEW_WINDOW,
 844     "Target(s) for download buffers created by "+
 845     "`open_download_buffer_automatically'.");
 846
 847 minibuffer_auto_complete_preferences.download = true;
 848 minibuffer.prototype.read_download = function () {
 849     keywords(arguments,
 850              $prompt = "Download",
 851              $completer = all_word_completer(
 852                  $completions = function (visitor) {
 853                      var dls = download_manager_service.activeDownloads;
 854                      while (dls.hasMoreElements()) {
 855                          let dl = dls.getNext();
 856                          visitor(id_to_download_info[dl.id]);
 857                      }
 858                  },
 859                  $get_string = function (x) x.display_name,
 860                  $get_description = function (x) x.source.spec,
 861                  $get_value = function (x) x),
 862              $auto_complete = "download",
 863              $auto_complete_initial = true,
 864              $match_required = true);
 865     var result = yield this.read(forward_keywords(arguments));
 866     yield co_return(result);
 867 };
 868
 869 function download_show (window, target, info) {
 870     if (! window)
 871         target = OPEN_NEW_WINDOW;
 872     create_buffer(window, buffer_creator(download_buffer, $info = info), target);
 873 }
 874
 875 function download_show_new_window (I) {
 876     var info = yield I.minibuffer.read_download($prompt = "Show download:");
 877     download_show(I.window, OPEN_NEW_WINDOW, info);
 878 }
 879
 880 function download_show_new_buffer (I) {
 881     var info = yield I.minibuffer.read_download($prompt = "Show download:");
 882     download_show(I.window, OPEN_NEW_BUFFER, info);
 883 }
 884
 885 function download_show_new_buffer_background (I) {
 886     var info = yield I.minibuffer.read_download($prompt = "Show download:");
 887     download_show(I.window, OPEN_NEW_BUFFER_BACKGROUND, info);
 888 }
 889
 890 function open_download_buffer_automatically (info) {
 891     var buf = info.source_buffer;
 892     var target = download_buffer_automatic_open_target;
 893     if (info.temporary_status == DOWNLOAD_NOT_TEMPORARY ||
 894         download_temporary_file_open_buffer_delay == 0)
 895     {
 896         download_show(buf.window, target, info);
 897     } else {
 898         var timer = null;
 899         function finish () {
 900             timer.cancel();
 901         }
 902         add_hook.call(info, "download_finished_hook", finish);
 903         timer = call_after_timeout(function () {
 904                 remove_hook.call(info, "download_finished_hook", finish);
 905                 download_show(buf.window, target, info);
 906             }, download_temporary_file_open_buffer_delay);
 907     }
 908 }
 909 add_hook("download_added_hook", open_download_buffer_automatically);
 910
 911 interactive("download-show",
 912     "Prompt for an ongoing download and open a download buffer showing "+
 913     "its progress.",
 914     alternates(download_show_new_buffer,
 915                download_show_new_window));
 916
 917 provide("download-manager");