Lady’s Gitweb - Gitweb/blob - gitweb.js

   1 // Copyright (C) 2007, Fredrik Kuivinen <frekui@gmail.com>
   2 //               2007, Petr Baudis <pasky@suse.cz>
   3 //          2008-2009, Jakub Narebski <jnareb@gmail.com>
   4
   5 /**
   6  * @fileOverview JavaScript code for gitweb (git web interface).
   7  * @license GPLv2 or later
   8  */
   9
  10 /*
  11  * This code uses DOM methods instead of (nonstandard) innerHTML
  12  * to modify page.
  13  *
  14  * innerHTML is non-standard IE extension, though supported by most
  15  * browsers; however Firefox up to version 1.5 didn't implement it in
  16  * a strict mode (application/xml+xhtml mimetype).
  17  *
  18  * Also my simple benchmarks show that using elem.firstChild.data =
  19  * 'content' is slightly faster than elem.innerHTML = 'content'.  It
  20  * is however more fragile (text element fragment must exists), and
  21  * less feature-rich (we cannot add HTML).
  22  *
  23  * Note that DOM 2 HTML is preferred over generic DOM 2 Core; the
  24  * equivalent using DOM 2 Core is usually shown in comments.
  25  */
  26
  27
  28 /* ============================================================ */
  29 /* generic utility functions */
  30
  31
  32 /**
  33  * pad number N with nonbreakable spaces on the left, to WIDTH characters
  34  * example: padLeftStr(12, 3, '&nbsp;') == '&nbsp;12'
  35  *          ('&nbsp;' is nonbreakable space)
  36  *
  37  * @param {Number|String} input: number to pad
  38  * @param {Number} width: visible width of output
  39  * @param {String} str: string to prefix to string, e.g. '&nbsp;'
  40  * @returns {String} INPUT prefixed with (WIDTH - INPUT.length) x STR
  41  */
  42 function padLeftStr(input, width, str) {
  43         var prefix = '';
  44
  45         width -= input.toString().length;
  46         while (width > 1) {
  47                 prefix += str;
  48                 width--;
  49         }
  50         return prefix + input;
  51 }
  52
  53 /**
  54  * Pad INPUT on the left to SIZE width, using given padding character CH,
  55  * for example padLeft('a', 3, '_') is '__a'.
  56  *
  57  * @param {String} input: input value converted to string.
  58  * @param {Number} width: desired length of output.
  59  * @param {String} ch: single character to prefix to string.
  60  *
  61  * @returns {String} Modified string, at least SIZE length.
  62  */
  63 function padLeft(input, width, ch) {
  64         var s = input + "";
  65         while (s.length < width) {
  66                 s = ch + s;
  67         }
  68         return s;
  69 }
  70
  71 /**
  72  * Create XMLHttpRequest object in cross-browser way
  73  * @returns XMLHttpRequest object, or null
  74  */
  75 function createRequestObject() {
  76         try {
  77                 return new XMLHttpRequest();
  78         } catch (e) {}
  79         try {
  80                 return window.createRequest();
  81         } catch (e) {}
  82         try {
  83                 return new ActiveXObject("Msxml2.XMLHTTP");
  84         } catch (e) {}
  85         try {
  86                 return new ActiveXObject("Microsoft.XMLHTTP");
  87         } catch (e) {}
  88
  89         return null;
  90 }
  91
  92 /* ============================================================ */
  93 /* utility/helper functions (and variables) */
  94
  95 var xhr;        // XMLHttpRequest object
  96 var projectUrl; // partial query + separator ('?' or ';')
  97
  98 // 'commits' is an associative map. It maps SHA1s to Commit objects.
  99 var commits = {};
 100
 101 /**
 102  * constructor for Commit objects, used in 'blame'
 103  * @class Represents a blamed commit
 104  * @param {String} sha1: SHA-1 identifier of a commit
 105  */
 106 function Commit(sha1) {
 107         if (this instanceof Commit) {
 108                 this.sha1 = sha1;
 109                 this.nprevious = 0; /* number of 'previous', effective parents */
 110         } else {
 111                 return new Commit(sha1);
 112         }
 113 }
 114
 115 /* ............................................................ */
 116 /* progress info, timing, error reporting */
 117
 118 var blamedLines = 0;
 119 var totalLines  = '???';
 120 var div_progress_bar;
 121 var div_progress_info;
 122
 123 /**
 124  * Detects how many lines does a blamed file have,
 125  * This information is used in progress info
 126  *
 127  * @returns {Number|String} Number of lines in file, or string '...'
 128  */
 129 function countLines() {
 130         var table =
 131                 document.getElementById('blame_table') ||
 132                 document.getElementsByTagName('table')[0];
 133
 134         if (table) {
 135                 return table.getElementsByTagName('tr').length - 1; // for header
 136         } else {
 137                 return '...';
 138         }
 139 }
 140
 141 /**
 142  * update progress info and length (width) of progress bar
 143  *
 144  * @globals div_progress_info, div_progress_bar, blamedLines, totalLines
 145  */
 146 function updateProgressInfo() {
 147         if (!div_progress_info) {
 148                 div_progress_info = document.getElementById('progress_info');
 149         }
 150         if (!div_progress_bar) {
 151                 div_progress_bar = document.getElementById('progress_bar');
 152         }
 153         if (!div_progress_info && !div_progress_bar) {
 154                 return;
 155         }
 156
 157         var percentage = Math.floor(100.0*blamedLines/totalLines);
 158
 159         if (div_progress_info) {
 160                 div_progress_info.firstChild.data  = blamedLines + ' / ' + totalLines +
 161                         ' (' + padLeftStr(percentage, 3, '&nbsp;') + '%)';
 162         }
 163
 164         if (div_progress_bar) {
 165                 //div_progress_bar.setAttribute('style', 'width: '+percentage+'%;');
 166                 div_progress_bar.style.width = percentage + '%';
 167         }
 168 }
 169
 170
 171 var t_interval_server = '';
 172 var cmds_server = '';
 173 var t0 = new Date();
 174
 175 /**
 176  * write how much it took to generate data, and to run script
 177  *
 178  * @globals t0, t_interval_server, cmds_server
 179  */
 180 function writeTimeInterval() {
 181         var info_time = document.getElementById('generating_time');
 182         if (!info_time || !t_interval_server) {
 183                 return;
 184         }
 185         var t1 = new Date();
 186         info_time.firstChild.data += ' + (' +
 187                 t_interval_server + ' sec server blame_data / ' +
 188                 (t1.getTime() - t0.getTime())/1000 + ' sec client JavaScript)';
 189
 190         var info_cmds = document.getElementById('generating_cmd');
 191         if (!info_time || !cmds_server) {
 192                 return;
 193         }
 194         info_cmds.firstChild.data += ' + ' + cmds_server;
 195 }
 196
 197 /**
 198  * show an error message alert to user within page (in prohress info area)
 199  * @param {String} str: plain text error message (no HTML)
 200  *
 201  * @globals div_progress_info
 202  */
 203 function errorInfo(str) {
 204         if (!div_progress_info) {
 205                 div_progress_info = document.getElementById('progress_info');
 206         }
 207         if (div_progress_info) {
 208                 div_progress_info.className = 'error';
 209                 div_progress_info.firstChild.data = str;
 210         }
 211 }
 212
 213 /* ............................................................ */
 214 /* coloring rows like 'blame' after 'blame_data' finishes */
 215
 216 /**
 217  * returns true if given row element (tr) is first in commit group
 218  * to be used only after 'blame_data' finishes (after processing)
 219  *
 220  * @param {HTMLElement} tr: table row
 221  * @returns {Boolean} true if TR is first in commit group
 222  */
 223 function isStartOfGroup(tr) {
 224         return tr.firstChild.className === 'sha1';
 225 }
 226
 227 var colorRe = /(?:light|dark)/;
 228
 229 /**
 230  * change colors to use zebra coloring (2 colors) instead of 3 colors
 231  * concatenate neighbour commit groups belonging to the same commit
 232  *
 233  * @globals colorRe
 234  */
 235 function fixColorsAndGroups() {
 236         var colorClasses = ['light', 'dark'];
 237         var linenum = 1;
 238         var tr, prev_group;
 239         var colorClass = 0;
 240         var table =
 241                 document.getElementById('blame_table') ||
 242                 document.getElementsByTagName('table')[0];
 243
 244         while ((tr = document.getElementById('l'+linenum))) {
 245         // index origin is 0, which is table header; start from 1
 246         //while ((tr = table.rows[linenum])) { // <- it is slower
 247                 if (isStartOfGroup(tr, linenum, document)) {
 248                         if (prev_group &&
 249                             prev_group.firstChild.firstChild.href ===
 250                                     tr.firstChild.firstChild.href) {
 251                                 // we have to concatenate groups
 252                                 var prev_rows = prev_group.firstChild.rowSpan || 1;
 253                                 var curr_rows =         tr.firstChild.rowSpan || 1;
 254                                 prev_group.firstChild.rowSpan = prev_rows + curr_rows;
 255                                 //tr.removeChild(tr.firstChild);
 256                                 tr.deleteCell(0); // DOM2 HTML way
 257                         } else {
 258                                 colorClass = (colorClass + 1) % 2;
 259                                 prev_group = tr;
 260                         }
 261                 }
 262                 var tr_class = tr.className;
 263                 tr.className = tr_class.replace(colorRe, colorClasses[colorClass]);
 264                 linenum++;
 265         }
 266 }
 267
 268 /* ............................................................ */
 269 /* time and data */
 270
 271 /**
 272  * used to extract hours and minutes from timezone info, e.g '-0900'
 273  * @constant
 274  */
 275 var tzRe = /^([+-][0-9][0-9])([0-9][0-9])$/;
 276
 277 /**
 278  * return date in local time formatted in iso-8601 like format
 279  * 'yyyy-mm-dd HH:MM:SS +/-ZZZZ' e.g. '2005-08-07 21:49:46 +0200'
 280  *
 281  * @param {Number} epoch: seconds since '00:00:00 1970-01-01 UTC'
 282  * @param {String} timezoneInfo: numeric timezone '(+|-)HHMM'
 283  * @returns {String} date in local time in iso-8601 like format
 284  *
 285  * @globals tzRe
 286  */
 287 function formatDateISOLocal(epoch, timezoneInfo) {
 288         var match = tzRe.exec(timezoneInfo);
 289         // date corrected by timezone
 290         var localDate = new Date(1000 * (epoch +
 291                 (parseInt(match[1],10)*3600 + parseInt(match[2],10)*60)));
 292         var localDateStr = // e.g. '2005-08-07'
 293                 localDate.getUTCFullYear()                 + '-' +
 294                 padLeft(localDate.getUTCMonth()+1, 2, '0') + '-' +
 295                 padLeft(localDate.getUTCDate(),    2, '0');
 296         var localTimeStr = // e.g. '21:49:46'
 297                 padLeft(localDate.getUTCHours(),   2, '0') + ':' +
 298                 padLeft(localDate.getUTCMinutes(), 2, '0') + ':' +
 299                 padLeft(localDate.getUTCSeconds(), 2, '0');
 300
 301         return localDateStr + ' ' + localTimeStr + ' ' + timezoneInfo;
 302 }
 303
 304 /* ............................................................ */
 305 /* unquoting/unescaping filenames */
 306
 307 /**#@+
 308  * @constant
 309  */
 310 var escCodeRe = /\\([^0-7]|[0-7]{1,3})/g;
 311 var octEscRe = /^[0-7]{1,3}$/;
 312 var maybeQuotedRe = /^\"(.*)\"$/;
 313 /**#@-*/
 314
 315 /**
 316  * unquote maybe git-quoted filename
 317  * e.g. 'aa' -> 'aa', '"a\ta"' -> 'a    a'
 318  *
 319  * @param {String} str: git-quoted string
 320  * @returns {String} Unquoted and unescaped string
 321  *
 322  * @globals escCodeRe, octEscRe, maybeQuotedRe
 323  */
 324 function unquote(str) {
 325         function unq(seq) {
 326                 var es = {
 327                         // character escape codes, aka escape sequences (from C)
 328                         // replacements are to some extent JavaScript specific
 329                         t: "\t",   // tab            (HT, TAB)
 330                         n: "\n",   // newline        (NL)
 331                         r: "\r",   // return         (CR)
 332                         f: "\f",   // form feed      (FF)
 333                         b: "\b",   // backspace      (BS)
 334                         a: "\x07", // alarm (bell)   (BEL)
 335                         e: "\x1B", // escape         (ESC)
 336                         v: "\v"    // vertical tab   (VT)
 337                 };
 338
 339                 if (seq.search(octEscRe) !== -1) {
 340                         // octal char sequence
 341                         return String.fromCharCode(parseInt(seq, 8));
 342                 } else if (seq in es) {
 343                         // C escape sequence, aka character escape code
 344                         return es[seq];
 345                 }
 346                 // quoted ordinary character
 347                 return seq;
 348         }
 349
 350         var match = str.match(maybeQuotedRe);
 351         if (match) {
 352                 str = match[1];
 353                 // perhaps str = eval('"'+str+'"'); would be enough?
 354                 str = str.replace(escCodeRe,
 355                         function (substr, p1, offset, s) { return unq(p1); });
 356         }
 357         return str;
 358 }
 359
 360 /* ============================================================ */
 361 /* main part: parsing response */
 362
 363 /**
 364  * Function called for each blame entry, as soon as it finishes.
 365  * It updates page via DOM manipulation, adding sha1 info, etc.
 366  *
 367  * @param {Commit} commit: blamed commit
 368  * @param {Object} group: object representing group of lines,
 369  *                        which blame the same commit (blame entry)
 370  *
 371  * @globals blamedLines
 372  */
 373 function handleLine(commit, group) {
 374         /*
 375            This is the structure of the HTML fragment we are working
 376            with:
 377
 378            <tr id="l123" class="">
 379              <td class="sha1" title=""><a href=""> </a></td>
 380              <td class="linenr"><a class="linenr" href="">123</a></td>
 381              <td class="pre"># times (my ext3 doesn&#39;t).</td>
 382            </tr>
 383         */
 384
 385         var resline = group.resline;
 386
 387         // format date and time string only once per commit
 388         if (!commit.info) {
 389                 /* e.g. 'Kay Sievers, 2005-08-07 21:49:46 +0200' */
 390                 commit.info = commit.author + ', ' +
 391                         formatDateISOLocal(commit.authorTime, commit.authorTimezone);
 392         }
 393
 394         // loop over lines in commit group
 395         for (var i = 0; i < group.numlines; i++, resline++) {
 396                 var tr = document.getElementById('l'+resline);
 397                 if (!tr) {
 398                         break;
 399                 }
 400                 /*
 401                         <tr id="l123" class="">
 402                           <td class="sha1" title=""><a href=""> </a></td>
 403                           <td class="linenr"><a class="linenr" href="">123</a></td>
 404                           <td class="pre"># times (my ext3 doesn&#39;t).</td>
 405                         </tr>
 406                 */
 407                 var td_sha1  = tr.firstChild;
 408                 var a_sha1   = td_sha1.firstChild;
 409                 var a_linenr = td_sha1.nextSibling.firstChild;
 410
 411                 /* <tr id="l123" class=""> */
 412                 var tr_class = 'light'; // or tr.className
 413                 if (commit.boundary) {
 414                         tr_class += ' boundary';
 415                 }
 416                 if (commit.nprevious === 0) {
 417                         tr_class += ' no-previous';
 418                 } else if (commit.nprevious > 1) {
 419                         tr_class += ' multiple-previous';
 420                 }
 421                 tr.className = tr_class;
 422
 423                 /* <td class="sha1" title="?" rowspan="?"><a href="?">?</a></td> */
 424                 if (i === 0) {
 425                         td_sha1.title = commit.info;
 426                         td_sha1.rowSpan = group.numlines;
 427
 428                         a_sha1.href = projectUrl + 'a=commit;h=' + commit.sha1;
 429                         a_sha1.firstChild.data = commit.sha1.substr(0, 8);
 430                         if (group.numlines >= 2) {
 431                                 var fragment = document.createDocumentFragment();
 432                                 var br   = document.createElement("br");
 433                                 var text = document.createTextNode(
 434                                         commit.author.match(/\b([A-Z])\B/g).join(''));
 435                                 if (br && text) {
 436                                         var elem = fragment || td_sha1;
 437                                         elem.appendChild(br);
 438                                         elem.appendChild(text);
 439                                         if (fragment) {
 440                                                 td_sha1.appendChild(fragment);
 441                                         }
 442                                 }
 443                         }
 444                 } else {
 445                         //tr.removeChild(td_sha1); // DOM2 Core way
 446                         tr.deleteCell(0); // DOM2 HTML way
 447                 }
 448
 449                 /* <td class="linenr"><a class="linenr" href="?">123</a></td> */
 450                 var linenr_commit =
 451                         ('previous' in commit ? commit.previous : commit.sha1);
 452                 var linenr_filename =
 453                         ('file_parent' in commit ? commit.file_parent : commit.filename);
 454                 a_linenr.href = projectUrl + 'a=blame_incremental' +
 455                         ';hb=' + linenr_commit +
 456                         ';f='  + encodeURIComponent(linenr_filename) +
 457                         '#l' + (group.srcline + i);
 458
 459                 blamedLines++;
 460
 461                 //updateProgressInfo();
 462         }
 463 }
 464
 465 // ----------------------------------------------------------------------
 466
 467 var inProgress = false;   // are we processing response
 468
 469 /**#@+
 470  * @constant
 471  */
 472 var sha1Re = /^([0-9a-f]{40}) ([0-9]+) ([0-9]+) ([0-9]+)/;
 473 var infoRe = /^([a-z-]+) ?(.*)/;
 474 var endRe  = /^END ?([^ ]*) ?(.*)/;
 475 /**@-*/
 476
 477 var curCommit = new Commit();
 478 var curGroup  = {};
 479
 480 var pollTimer = null;
 481
 482 /**
 483  * Parse output from 'git blame --incremental [...]', received via
 484  * XMLHttpRequest from server (blamedataUrl), and call handleLine
 485  * (which updates page) as soon as blame entry is completed.
 486  *
 487  * @param {String[]} lines: new complete lines from blamedata server
 488  *
 489  * @globals commits, curCommit, curGroup, t_interval_server, cmds_server
 490  * @globals sha1Re, infoRe, endRe
 491  */
 492 function processBlameLines(lines) {
 493         var match;
 494
 495         for (var i = 0, len = lines.length; i < len; i++) {
 496
 497                 if ((match = sha1Re.exec(lines[i]))) {
 498                         var sha1 = match[1];
 499                         var srcline  = parseInt(match[2], 10);
 500                         var resline  = parseInt(match[3], 10);
 501                         var numlines = parseInt(match[4], 10);
 502
 503                         var c = commits[sha1];
 504                         if (!c) {
 505                                 c = new Commit(sha1);
 506                                 commits[sha1] = c;
 507                         }
 508                         curCommit = c;
 509
 510                         curGroup.srcline = srcline;
 511                         curGroup.resline = resline;
 512                         curGroup.numlines = numlines;
 513
 514                 } else if ((match = infoRe.exec(lines[i]))) {
 515                         var info = match[1];
 516                         var data = match[2];
 517                         switch (info) {
 518                         case 'filename':
 519                                 curCommit.filename = unquote(data);
 520                                 // 'filename' information terminates the entry
 521                                 handleLine(curCommit, curGroup);
 522                                 updateProgressInfo();
 523                                 break;
 524                         case 'author':
 525                                 curCommit.author = data;
 526                                 break;
 527                         case 'author-time':
 528                                 curCommit.authorTime = parseInt(data, 10);
 529                                 break;
 530                         case 'author-tz':
 531                                 curCommit.authorTimezone = data;
 532                                 break;
 533                         case 'previous':
 534                                 curCommit.nprevious++;
 535                                 // store only first 'previous' header
 536                                 if (!'previous' in curCommit) {
 537                                         var parts = data.split(' ', 2);
 538                                         curCommit.previous    = parts[0];
 539                                         curCommit.file_parent = unquote(parts[1]);
 540                                 }
 541                                 break;
 542                         case 'boundary':
 543                                 curCommit.boundary = true;
 544                                 break;
 545                         } // end switch
 546
 547                 } else if ((match = endRe.exec(lines[i]))) {
 548                         t_interval_server = match[1];
 549                         cmds_server = match[2];
 550
 551                 } else if (lines[i] !== '') {
 552                         // malformed line
 553
 554                 } // end if (match)
 555
 556         } // end for (lines)
 557 }
 558
 559 /**
 560  * Process new data and return pointer to end of processed part
 561  *
 562  * @param {String} unprocessed: new data (from nextReadPos)
 563  * @param {Number} nextReadPos: end of last processed data
 564  * @return {Number} end of processed data (new value for nextReadPos)
 565  */
 566 function processData(unprocessed, nextReadPos) {
 567         var lastLineEnd = unprocessed.lastIndexOf('\n');
 568         if (lastLineEnd !== -1) {
 569                 var lines = unprocessed.substring(0, lastLineEnd).split('\n');
 570                 nextReadPos += lastLineEnd + 1 /* 1 == '\n'.length */;
 571
 572                 processBlameLines(lines);
 573         } // end if
 574
 575         return nextReadPos;
 576 }
 577
 578 /**
 579  * Handle XMLHttpRequest errors
 580  *
 581  * @param {XMLHttpRequest} xhr: XMLHttpRequest object
 582  *
 583  * @globals pollTimer, commits, inProgress
 584  */
 585 function handleError(xhr) {
 586         errorInfo('Server error: ' +
 587                 xhr.status + ' - ' + (xhr.statusText || 'Error contacting server'));
 588
 589         clearInterval(pollTimer);
 590         commits = {}; // free memory
 591
 592         inProgress = false;
 593 }
 594
 595 /**
 596  * Called after XMLHttpRequest finishes (loads)
 597  *
 598  * @param {XMLHttpRequest} xhr: XMLHttpRequest object (unused)
 599  *
 600  * @globals pollTimer, commits, inProgress
 601  */
 602 function responseLoaded(xhr) {
 603         clearInterval(pollTimer);
 604
 605         fixColorsAndGroups();
 606         writeTimeInterval();
 607         commits = {}; // free memory
 608
 609         inProgress = false;
 610 }
 611
 612 /**
 613  * handler for XMLHttpRequest onreadystatechange event
 614  * @see startBlame
 615  *
 616  * @globals xhr, inProgress
 617  */
 618 function handleResponse() {
 619
 620         /*
 621          * xhr.readyState
 622          *
 623          *  Value  Constant (W3C)    Description
 624          *  -------------------------------------------------------------------
 625          *  0      UNSENT            open() has not been called yet.
 626          *  1      OPENED            send() has not been called yet.
 627          *  2      HEADERS_RECEIVED  send() has been called, and headers
 628          *                           and status are available.
 629          *  3      LOADING           Downloading; responseText holds partial data.
 630          *  4      DONE              The operation is complete.
 631          */
 632
 633         if (xhr.readyState !== 4 && xhr.readyState !== 3) {
 634                 return;
 635         }
 636
 637         // the server returned error
 638         if (xhr.readyState === 3 && xhr.status !== 200) {
 639                 return;
 640         }
 641         if (xhr.readyState === 4 && xhr.status !== 200) {
 642                 handleError(xhr);
 643                 return;
 644         }
 645
 646         // In konqueror xhr.responseText is sometimes null here...
 647         if (xhr.responseText === null) {
 648                 return;
 649         }
 650
 651         // in case we were called before finished processing
 652         if (inProgress) {
 653                 return;
 654         } else {
 655                 inProgress = true;
 656         }
 657
 658         // extract new whole (complete) lines, and process them
 659         while (xhr.prevDataLength !== xhr.responseText.length) {
 660                 if (xhr.readyState === 4 &&
 661                     xhr.prevDataLength === xhr.responseText.length) {
 662                         break;
 663                 }
 664
 665                 xhr.prevDataLength = xhr.responseText.length;
 666                 var unprocessed = xhr.responseText.substring(xhr.nextReadPos);
 667                 xhr.nextReadPos = processData(unprocessed, xhr.nextReadPos);
 668         } // end while
 669
 670         // did we finish work?
 671         if (xhr.readyState === 4 &&
 672             xhr.prevDataLength === xhr.responseText.length) {
 673                 responseLoaded(xhr);
 674         }
 675
 676         inProgress = false;
 677 }
 678
 679 // ============================================================
 680 // ------------------------------------------------------------
 681
 682 /**
 683  * Incrementally update line data in blame_incremental view in gitweb.
 684  *
 685  * @param {String} blamedataUrl: URL to server script generating blame data.
 686  * @param {String} bUrl: partial URL to project, used to generate links.
 687  *
 688  * Called from 'blame_incremental' view after loading table with
 689  * file contents, a base for blame view.
 690  *
 691  * @globals xhr, t0, projectUrl, div_progress_bar, totalLines, pollTimer
 692 */
 693 function startBlame(blamedataUrl, bUrl) {
 694
 695         xhr = createRequestObject();
 696         if (!xhr) {
 697                 errorInfo('ERROR: XMLHttpRequest not supported');
 698                 return;
 699         }
 700
 701         t0 = new Date();
 702         projectUrl = bUrl + (bUrl.indexOf('?') === -1 ? '?' : ';');
 703         if ((div_progress_bar = document.getElementById('progress_bar'))) {
 704                 //div_progress_bar.setAttribute('style', 'width: 100%;');
 705                 div_progress_bar.style.cssText = 'width: 100%;';
 706         }
 707         totalLines = countLines();
 708         updateProgressInfo();
 709
 710         /* add extra properties to xhr object to help processing response */
 711         xhr.prevDataLength = -1;  // used to detect if we have new data
 712         xhr.nextReadPos = 0;      // where unread part of response starts
 713
 714         xhr.onreadystatechange = handleResponse;
 715         //xhr.onreadystatechange = function () { handleResponse(xhr); };
 716
 717         xhr.open('GET', blamedataUrl);
 718         xhr.setRequestHeader('Accept', 'text/plain');
 719         xhr.send(null);
 720
 721         // not all browsers call onreadystatechange event on each server flush
 722         // poll response using timer every second to handle this issue
 723         pollTimer = setInterval(xhr.onreadystatechange, 1000);
 724 }
 725
 726 // end of gitweb.js