src/stagit.c

   1 #include <sys/stat.h>
   2 #include <sys/types.h>
   3
   4 #include <err.h>
   5 #include <errno.h>
   6 #include <libgen.h>
   7 #include <limits.h>
   8 #include <stdint.h>
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <stdbool.h>
  12 #include <string.h>
  13 #include <time.h>
  14 #include <unistd.h>
  15
  16 #include <git2.h>
  17
  18 #ifdef HAS_CMARK
  19 #include <cmark-gfm.h>
  20 #endif
  21
  22 #include "cp.h"
  23 #include "compat.h"
  24
  25 struct deltainfo {
  26         git_patch *patch;
  27
  28         size_t addcount;
  29         size_t delcount;
  30 };
  31
  32 struct commitinfo {
  33         const git_oid *id;
  34
  35         char oid[GIT_OID_HEXSZ + 1];
  36         char parentoid[GIT_OID_HEXSZ + 1];
  37
  38         const git_signature *author;
  39         const git_signature *committer;
  40         const char          *summary;
  41         const char          *msg;
  42
  43         git_diff   *diff;
  44         git_commit *commit;
  45         git_commit *parent;
  46         git_tree   *commit_tree;
  47         git_tree   *parent_tree;
  48
  49         size_t addcount;
  50         size_t delcount;
  51         size_t filecount;
  52
  53         struct deltainfo **deltas;
  54         size_t ndeltas;
  55 };
  56
  57 static git_repository *repo;
  58
  59 static const char *relpath = "";
  60 static const char *repodir;
  61
  62 static char *name = "";
  63 static char *strippedname = "";
  64 static char description[255];
  65 static char cloneurl[1024];
  66 static char *submodules;
  67 static char *licensefiles[] = { "HEAD:LICENSE", "HEAD:LICENSE.md", "HEAD:COPYING" };
  68 static char *license;
  69 static char *readmefiles[] = { "HEAD:README", "HEAD:README.md" };
  70 static char *readme;
  71 static long long nlogcommits = -1; /* < 0 indicates not used */
  72
  73 bool htmlized; /* true if markdoown converted to HTML */
  74
  75 /* cache */
  76 static git_oid lastoid;
  77 static char lastoidstr[GIT_OID_HEXSZ + 2]; /* id + newline + NUL byte */
  78 static FILE *rcachefp, *wcachefp;
  79 static const char *cachefile;
  80
  81 void
  82 joinpath(char *buf, size_t bufsiz, const char *path, const char *path2)
  83 {
  84         int r;
  85
  86         r = snprintf(buf, bufsiz, "%s%s%s",
  87                 path, path[0] && path[strlen(path) - 1] != '/' ? "/" : "", path2);
  88         if (r < 0 || (size_t)r >= bufsiz)
  89                 errx(1, "path truncated: '%s%s%s'",
  90                         path, path[0] && path[strlen(path) - 1] != '/' ? "/" : "", path2);
  91 }
  92
  93 void
  94 deltainfo_free(struct deltainfo *di)
  95 {
  96         if (!di)
  97                 return;
  98         git_patch_free(di->patch);
  99         memset(di, 0, sizeof(*di));
 100         free(di);
 101 }
 102
 103 int
 104 commitinfo_getstats(struct commitinfo *ci)
 105 {
 106         struct deltainfo *di;
 107         git_diff_options opts;
 108         git_diff_find_options fopts;
 109         const git_diff_delta *delta;
 110         const git_diff_hunk *hunk;
 111         const git_diff_line *line;
 112         git_patch *patch = NULL;
 113         size_t ndeltas, nhunks, nhunklines;
 114         size_t i, j, k;
 115
 116         if (git_tree_lookup(&(ci->commit_tree), repo, git_commit_tree_id(ci->commit)))
 117                 goto err;
 118         if (!git_commit_parent(&(ci->parent), ci->commit, 0)) {
 119                 if (git_tree_lookup(&(ci->parent_tree), repo, git_commit_tree_id(ci->parent))) {
 120                         ci->parent = NULL;
 121                         ci->parent_tree = NULL;
 122                 }
 123         }
 124
 125         git_diff_init_options(&opts, GIT_DIFF_OPTIONS_VERSION);
 126         opts.flags |= GIT_DIFF_DISABLE_PATHSPEC_MATCH |
 127                       GIT_DIFF_IGNORE_SUBMODULES |
 128                       GIT_DIFF_INCLUDE_TYPECHANGE;
 129         if (git_diff_tree_to_tree(&(ci->diff), repo, ci->parent_tree, ci->commit_tree, &opts))
 130                 goto err;
 131
 132         if (git_diff_find_init_options(&fopts, GIT_DIFF_FIND_OPTIONS_VERSION))
 133                 goto err;
 134         /* find renames and copies, exact matches (no heuristic) for renames. */
 135         fopts.flags |= GIT_DIFF_FIND_RENAMES | GIT_DIFF_FIND_COPIES |
 136                        GIT_DIFF_FIND_EXACT_MATCH_ONLY;
 137         if (git_diff_find_similar(ci->diff, &fopts))
 138                 goto err;
 139
 140         ndeltas = git_diff_num_deltas(ci->diff);
 141         if (ndeltas && !(ci->deltas = calloc(ndeltas, sizeof(struct deltainfo *))))
 142                 err(1, "calloc");
 143
 144         for (i = 0; i < ndeltas; i++) {
 145                 if (git_patch_from_diff(&patch, ci->diff, i))
 146                         goto err;
 147
 148                 if (!(di = calloc(1, sizeof(struct deltainfo))))
 149                         err(1, "calloc");
 150                 di->patch = patch;
 151                 ci->deltas[i] = di;
 152
 153                 delta = git_patch_get_delta(patch);
 154
 155                 /* skip stats for binary data */
 156                 if (delta->flags & GIT_DIFF_FLAG_BINARY)
 157                         continue;
 158
 159                 nhunks = git_patch_num_hunks(patch);
 160                 for (j = 0; j < nhunks; j++) {
 161                         if (git_patch_get_hunk(&hunk, &nhunklines, patch, j))
 162                                 break;
 163                         for (k = 0; ; k++) {
 164                                 if (git_patch_get_line_in_hunk(&line, patch, j, k))
 165                                         break;
 166                                 if (line->old_lineno == -1) {
 167                                         di->addcount++;
 168                                         ci->addcount++;
 169                                 } else if (line->new_lineno == -1) {
 170                                         di->delcount++;
 171                                         ci->delcount++;
 172                                 }
 173                         }
 174                 }
 175         }
 176         ci->ndeltas = i;
 177         ci->filecount = i;
 178
 179         return 0;
 180
 181 err:
 182         git_diff_free(ci->diff);
 183         ci->diff = NULL;
 184         git_tree_free(ci->commit_tree);
 185         ci->commit_tree = NULL;
 186         git_tree_free(ci->parent_tree);
 187         ci->parent_tree = NULL;
 188         git_commit_free(ci->parent);
 189         ci->parent = NULL;
 190
 191         if (ci->deltas)
 192                 for (i = 0; i < ci->ndeltas; i++)
 193                         deltainfo_free(ci->deltas[i]);
 194         free(ci->deltas);
 195         ci->deltas = NULL;
 196         ci->ndeltas = 0;
 197         ci->addcount = 0;
 198         ci->delcount = 0;
 199         ci->filecount = 0;
 200
 201         return -1;
 202 }
 203
 204 void
 205 commitinfo_free(struct commitinfo *ci)
 206 {
 207         size_t i;
 208
 209         if (!ci)
 210                 return;
 211         if (ci->deltas)
 212                 for (i = 0; i < ci->ndeltas; i++)
 213                         deltainfo_free(ci->deltas[i]);
 214
 215         free(ci->deltas);
 216         git_diff_free(ci->diff);
 217         git_tree_free(ci->commit_tree);
 218         git_tree_free(ci->parent_tree);
 219         git_commit_free(ci->commit);
 220         git_commit_free(ci->parent);
 221         memset(ci, 0, sizeof(*ci));
 222         free(ci);
 223 }
 224
 225 struct commitinfo *
 226 commitinfo_getbyoid(const git_oid *id)
 227 {
 228         struct commitinfo *ci;
 229
 230         if (!(ci = calloc(1, sizeof(struct commitinfo))))
 231                 err(1, "calloc");
 232
 233         if (git_commit_lookup(&(ci->commit), repo, id))
 234                 goto err;
 235         ci->id = id;
 236
 237         git_oid_tostr(ci->oid, sizeof(ci->oid), git_commit_id(ci->commit));
 238         git_oid_tostr(ci->parentoid, sizeof(ci->parentoid), git_commit_parent_id(ci->commit, 0));
 239
 240         ci->author = git_commit_author(ci->commit);
 241         ci->committer = git_commit_committer(ci->commit);
 242         ci->summary = git_commit_summary(ci->commit);
 243         ci->msg = git_commit_message(ci->commit);
 244
 245         return ci;
 246
 247 err:
 248         commitinfo_free(ci);
 249
 250         return NULL;
 251 }
 252
 253 FILE *
 254 efopen(const char *name, const char *flags)
 255 {
 256         FILE *fp;
 257
 258         if (!(fp = fopen(name, flags)))
 259                 err(1, "fopen: '%s'", name);
 260
 261         return fp;
 262 }
 263
 264 /* Escape characters below as HTML 2.0 / XML 1.0. */
 265 void
 266 xmlencode(FILE *fp, const char *s, size_t len)
 267 {
 268         size_t i;
 269
 270         for (i = 0; *s && i < len; s++, i++) {
 271                 switch(*s) {
 272                 case '<':  fputs("&lt;",   fp); break;
 273                 case '>':  fputs("&gt;",   fp); break;
 274                 case '\'': fputs("&#39;",  fp); break;
 275                 case '&':  fputs("&amp;",  fp); break;
 276                 case '"':  fputs("&quot;", fp); break;
 277                 default:   fputc(*s, fp);
 278                 }
 279         }
 280 }
 281
 282 int
 283 mkdirp(const char *path)
 284 {
 285         char tmp[PATH_MAX], *p;
 286
 287         if (strlcpy(tmp, path, sizeof(tmp)) >= sizeof(tmp))
 288                 errx(1, "path truncated: '%s'", path);
 289         for (p = tmp + (tmp[0] == '/'); *p; p++) {
 290                 if (*p != '/')
 291                         continue;
 292                 *p = '\0';
 293                 if (mkdir(tmp, S_IRWXU | S_IRWXG | S_IRWXO) < 0 && errno != EEXIST)
 294                         return -1;
 295                 *p = '/';
 296         }
 297         if (mkdir(tmp, S_IRWXU | S_IRWXG | S_IRWXO) < 0 && errno != EEXIST)
 298                 return -1;
 299         return 0;
 300 }
 301
 302 void
 303 printtimez(FILE *fp, const git_time *intime)
 304 {
 305         struct tm *intm;
 306         time_t t;
 307         char out[32];
 308
 309         t = (time_t)intime->time;
 310         if (!(intm = gmtime(&t)))
 311                 return;
 312         strftime(out, sizeof(out), "%Y-%m-%dT%H:%M:%SZ", intm);
 313         fputs(out, fp);
 314 }
 315
 316 void
 317 printtime(FILE *fp, const git_time *intime)
 318 {
 319         struct tm *intm;
 320         time_t t;
 321         char out[32];
 322
 323         t = (time_t)intime->time + (intime->offset * 60);
 324         if (!(intm = gmtime(&t)))
 325                 return;
 326         strftime(out, sizeof(out), "%a, %e %b %Y %H:%M:%S", intm);
 327         if (intime->offset < 0)
 328                 fprintf(fp, "%s -%02d%02d", out,
 329                             -(intime->offset) / 60, -(intime->offset) % 60);
 330         else
 331                 fprintf(fp, "%s +%02d%02d", out,
 332                             intime->offset / 60, intime->offset % 60);
 333 }
 334
 335 void
 336 printtimeshort(FILE *fp, const git_time *intime)
 337 {
 338         struct tm *intm;
 339         time_t t;
 340         char out[32];
 341
 342         t = (time_t)intime->time;
 343         if (!(intm = gmtime(&t)))
 344                 return;
 345         strftime(out, sizeof(out), "%Y-%m-%d %H:%M", intm);
 346         fputs(out, fp);
 347 }
 348
 349 void
 350 writeheader(FILE *fp, const char *title)
 351 {
 352         fputs("<!DOCTYPE html>\n"
 353                 "<html lang=\"en\">\n<head>\n"
 354                 "<meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\" />\n"
 355                 "<meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\" />\n"
 356                 "<title>", fp);
 357         xmlencode(fp, title, strlen(title));
 358         if (title[0] && strippedname[0])
 359                 fputs(" - ", fp);
 360         xmlencode(fp, strippedname, strlen(strippedname));
 361         if (description[0])
 362                 fputs(" - ", fp);
 363         xmlencode(fp, description, strlen(description));
 364         fprintf(fp, "</title>\n<link rel=\"icon\" type=\"image/png\" href=\"%sfavicon.png\" />\n", relpath);
 365         fprintf(fp, "<link rel=\"alternate\" type=\"application/atom+xml\" title=\"%s Atom Feed\" href=\"%satom.xml\" />\n",
 366                 name, relpath);
 367         fprintf(fp, "<link rel=\"stylesheet\" type=\"text/css\" href=\"%sstyle.css\" />\n", relpath);
 368         fprintf(fp, "<link rel=\"stylesheet\" type=\"text/css\" href=\"%ssyntax.css\" />\n", relpath);
 369         fputs("</head>\n<body>\n<table><tr><td>", fp);
 370         fprintf(fp, "<a href=\"../%s\"><img alt=\"Home\" src=\"%slogo.png\" alt=\"\" width=\"32\" height=\"32\" /></a>",
 371                 relpath, relpath);
 372         fputs("</td><td><h1>", fp);
 373         xmlencode(fp, strippedname, strlen(strippedname));
 374         fputs("</h1></td></tr><tr><td></td><td><span class=\"desc\">", fp);
 375         xmlencode(fp, description, strlen(description));
 376         fputs("</span></td></tr>", fp);
 377         if (cloneurl[0]) {
 378                 fputs("<tr class=\"url\"><td></td><td><span class=\"clone\">git clone <a href=\"", fp);
 379                 xmlencode(fp, cloneurl, strlen(cloneurl));
 380                 fputs("\">", fp);
 381                 xmlencode(fp, cloneurl, strlen(cloneurl));
 382                 fputs("</a></span></td></tr>", fp);
 383         }
 384         fputs("<tr><td></td><td>\n", fp);
 385         fprintf(fp, "<a href=\"%slog.html\">Log</a> | ", relpath);
 386         fprintf(fp, "<a href=\"%sfiles.html\">Files</a> | ", relpath);
 387         fprintf(fp, "<a href=\"%srefs.html\">Refs</a>", relpath);
 388         if (submodules)
 389                 fprintf(fp, " | <a href=\"%sfile/%s.html\">Submodules</a>",
 390                         relpath, submodules);
 391         if (readme)
 392                 fprintf(fp, " | <a href=\"%sfile/%s.html\">README</a>",
 393                         relpath, readme);
 394         if (license)
 395                 fprintf(fp, " | <a href=\"%sfile/%s.html\">LICENSE</a>",
 396                         relpath, license);
 397         fprintf(fp, " | <a href=\"%s%s.tar.gz\">Download</a>",
 398                                         relpath, strippedname);
 399         fputs("</td></tr></table>\n<hr/>\n<div id=\"content\">\n", fp);
 400 }
 401
 402 void
 403 writefooter(FILE *fp)
 404 {
 405         fputs("</div>\n</body>\n</html>\n", fp);
 406 }
 407
 408 const char *
 409 get_ext(const char *filename)
 410 {
 411         const char *dot = strrchr(filename, '.');
 412         if(!dot || dot == filename) return "";
 413         return dot + 1;
 414 }
 415
 416 void
 417 call_chroma(const char *filename, FILE *fp, const char *s, size_t len)
 418 {
 419         htmlized = false;
 420         char *html = "";
 421         // Flush HTML-file
 422         fflush(fp);
 423
 424 #ifdef HAS_CMARK
 425         html = cmark_markdown_to_html(s, len, CMARK_OPT_DEFAULT);
 426         if (strcmp(get_ext(filename), "md") == 0) htmlized = true;
 427 #endif
 428
 429
 430 #ifdef HAS_CHROMA
 431         if (!htmlized) {
 432                 // Copy STDOUT
 433                 int stdout_copy = dup(1);
 434
 435                 // Redirect STDOUT
 436                 dup2(fileno(fp), 1);
 437
 438                 char cmd[255] = "chroma --html --html-only --html-lines --html-lines-table --filename ";
 439                 strncat(cmd, filename, strlen(filename) + 1);
 440                 FILE *child = popen(cmd, "w");
 441                 if (child == NULL) {
 442                         printf("child is null: %s", strerror(errno));
 443                         exit(1);
 444                 }
 445
 446                 // Give code to highlight through STDIN:
 447                 size_t i;
 448                 for (i = 0; *s && i < len; s++, i++) {
 449                         fprintf(child, "%c", *s);
 450                 }
 451
 452                 pclose(child);
 453                 fflush(stdout);
 454
 455                 // Give back STDOUT.
 456                 dup2(stdout_copy, 1);
 457
 458         } else {
 459                 fprintf(fp, "%s", html);
 460         }
 461 #else
 462                 fprintf(fp, "<pre>%s</pre>", s);
 463 #endif
 464 }
 465
 466 void
 467 writeblobhtml(const char *filename, FILE *fp, const git_blob *blob)
 468 {
 469         const char *s = git_blob_rawcontent(blob);
 470         git_off_t len = git_blob_rawsize(blob);
 471
 472         if (len > 0) {
 473                 call_chroma(filename, fp, s, len);
 474         }
 475 }
 476
 477 void
 478 printcommit(FILE *fp, struct commitinfo *ci)
 479 {
 480         fprintf(fp, "<b>commit</b> <a href=\"%scommit/%s.html\">%s</a>\n",
 481                         relpath, ci->oid, ci->oid);
 482
 483         if (ci->parentoid[0])
 484                 fprintf(fp, "<b>parent</b> <a href=\"%scommit/%s.html\">%s</a>\n",
 485                                 relpath, ci->parentoid, ci->parentoid);
 486
 487         if (ci->author) {
 488                 fputs("<b>Author:</b> ", fp);
 489                 xmlencode(fp, ci->author->name, strlen(ci->author->name));
 490                 fputs(" &lt;<a href=\"mailto:", fp);
 491                 xmlencode(fp, ci->author->email, strlen(ci->author->email));
 492                 fputs("\">", fp);
 493                 xmlencode(fp, ci->author->email, strlen(ci->author->email));
 494                 fputs("</a>&gt;\n<b>Date:</b>   ", fp);
 495                 printtime(fp, &(ci->author->when));
 496                 fputc('\n', fp);
 497         }
 498         if (ci->msg) {
 499                 fputc('\n', fp);
 500                 xmlencode(fp, ci->msg, strlen(ci->msg));
 501                 fputc('\n', fp);
 502         }
 503 }
 504
 505 void
 506 printshowfile(FILE *fp, struct commitinfo *ci)
 507 {
 508         const git_diff_delta *delta;
 509         const git_diff_hunk *hunk;
 510         const git_diff_line *line;
 511         git_patch *patch;
 512         size_t nhunks, nhunklines, changed, add, del, total, i, j, k;
 513         char linestr[80];
 514         int c;
 515
 516         printcommit(fp, ci);
 517
 518         if (!ci->deltas)
 519                 return;
 520
 521         if (ci->filecount > 1000   ||
 522             ci->ndeltas   > 1000   ||
 523             ci->addcount  > 100000 ||
 524             ci->delcount  > 100000) {
 525                 fputs("Diff is too large, output suppressed.\n", fp);
 526                 return;
 527         }
 528
 529         /* diff stat */
 530         fputs("<b>Diffstat:</b>\n<table>", fp);
 531         for (i = 0; i < ci->ndeltas; i++) {
 532                 delta = git_patch_get_delta(ci->deltas[i]->patch);
 533
 534                 switch (delta->status) {
 535                 case GIT_DELTA_ADDED:      c = 'A'; break;
 536                 case GIT_DELTA_COPIED:     c = 'C'; break;
 537                 case GIT_DELTA_DELETED:    c = 'D'; break;
 538                 case GIT_DELTA_MODIFIED:   c = 'M'; break;
 539                 case GIT_DELTA_RENAMED:    c = 'R'; break;
 540                 case GIT_DELTA_TYPECHANGE: c = 'T'; break;
 541                 default:                   c = ' '; break;
 542                 }
 543                 if (c == ' ')
 544                         fprintf(fp, "<tr><td>%c", c);
 545                 else
 546                         fprintf(fp, "<tr><td class=\"%c\">%c", c, c);
 547
 548                 fprintf(fp, "</td><td><a href=\"#h%zu\">", i);
 549                 xmlencode(fp, delta->old_file.path, strlen(delta->old_file.path));
 550                 if (strcmp(delta->old_file.path, delta->new_file.path)) {
 551                         fputs(" -&gt; ", fp);
 552                         xmlencode(fp, delta->new_file.path, strlen(delta->new_file.path));
 553                 }
 554
 555                 add = ci->deltas[i]->addcount;
 556                 del = ci->deltas[i]->delcount;
 557                 changed = add + del;
 558                 total = sizeof(linestr) - 2;
 559                 if (changed > total) {
 560                         if (add)
 561                                 add = ((float)total / changed * add) + 1;
 562                         if (del)
 563                                 del = ((float)total / changed * del) + 1;
 564                 }
 565                 memset(&linestr, '+', add);
 566                 memset(&linestr[add], '-', del);
 567
 568                 fprintf(fp, "</a></td><td> | </td><td class=\"num\">%zu</td><td><span class=\"i\">",
 569                         ci->deltas[i]->addcount + ci->deltas[i]->delcount);
 570                 fwrite(&linestr, 1, add, fp);
 571                 fputs("</span><span class=\"d\">", fp);
 572                 fwrite(&linestr[add], 1, del, fp);
 573                 fputs("</span></td></tr>\n", fp);
 574         }
 575         fprintf(fp, "</table></pre><pre>%zu file%s changed, %zu insertion%s(+), %zu deletion%s(-)\n",
 576                 ci->filecount, ci->filecount == 1 ? "" : "s",
 577                 ci->addcount,  ci->addcount  == 1 ? "" : "s",
 578                 ci->delcount,  ci->delcount  == 1 ? "" : "s");
 579
 580         fputs("<hr/>", fp);
 581
 582         for (i = 0; i < ci->ndeltas; i++) {
 583                 patch = ci->deltas[i]->patch;
 584                 delta = git_patch_get_delta(patch);
 585                 fprintf(fp, "<b>diff --git a/<a id=\"h%zu\" href=\"%sfile/", i, relpath);
 586                 xmlencode(fp, delta->old_file.path, strlen(delta->old_file.path));
 587                 fputs(".html\">", fp);
 588                 xmlencode(fp, delta->old_file.path, strlen(delta->old_file.path));
 589                 fprintf(fp, "</a> b/<a href=\"%sfile/", relpath);
 590                 xmlencode(fp, delta->new_file.path, strlen(delta->new_file.path));
 591                 fprintf(fp, ".html\">");
 592                 xmlencode(fp, delta->new_file.path, strlen(delta->new_file.path));
 593                 fprintf(fp, "</a></b>\n");
 594
 595                 /* check binary data */
 596                 if (delta->flags & GIT_DIFF_FLAG_BINARY) {
 597                         fputs("Binary files differ.\n", fp);
 598                         continue;
 599                 }
 600
 601                 nhunks = git_patch_num_hunks(patch);
 602                 for (j = 0; j < nhunks; j++) {
 603                         if (git_patch_get_hunk(&hunk, &nhunklines, patch, j))
 604                                 break;
 605
 606                         fprintf(fp, "<a href=\"#h%zu-%zu\" id=\"h%zu-%zu\" class=\"h\">", i, j, i, j);
 607                         xmlencode(fp, hunk->header, hunk->header_len);
 608                         fputs("</a>", fp);
 609
 610                         for (k = 0; ; k++) {
 611                                 if (git_patch_get_line_in_hunk(&line, patch, j, k))
 612                                         break;
 613                                 if (line->old_lineno == -1)
 614                                         fprintf(fp, "<a href=\"#h%zu-%zu-%zu\" id=\"h%zu-%zu-%zu\" class=\"i\">+",
 615                                                 i, j, k, i, j, k);
 616                                 else if (line->new_lineno == -1)
 617                                         fprintf(fp, "<a href=\"#h%zu-%zu-%zu\" id=\"h%zu-%zu-%zu\" class=\"d\">-",
 618                                                 i, j, k, i, j, k);
 619                                 else
 620                                         fputc(' ', fp);
 621                                 xmlencode(fp, line->content, line->content_len);
 622                                 if (line->old_lineno == -1 || line->new_lineno == -1)
 623                                         fputs("</a>", fp);
 624                         }
 625                 }
 626         }
 627 }
 628
 629 void
 630 writelogline(FILE *fp, struct commitinfo *ci)
 631 {
 632         fputs("<tr><td>", fp);
 633         if (ci->author)
 634                 printtimeshort(fp, &(ci->author->when));
 635         fputs("</td><td>", fp);
 636         if (ci->summary) {
 637                 fprintf(fp, "<a href=\"%scommit/%s.html\">", relpath, ci->oid);
 638                 xmlencode(fp, ci->summary, strlen(ci->summary));
 639                 fputs("</a>", fp);
 640         }
 641         fputs("</td><td>", fp);
 642         if (ci->author)
 643                 xmlencode(fp, ci->author->name, strlen(ci->author->name));
 644         fputs("</td><td class=\"num\" align=\"right\">", fp);
 645         fprintf(fp, "%zu", ci->filecount);
 646         fputs("</td><td class=\"num\" align=\"right\">", fp);
 647         fprintf(fp, "+%zu", ci->addcount);
 648         fputs("</td><td class=\"num\" align=\"right\">", fp);
 649         fprintf(fp, "-%zu", ci->delcount);
 650         fputs("</td></tr>\n", fp);
 651 }
 652
 653 int
 654 writelog(FILE *fp, const git_oid *oid)
 655 {
 656         struct commitinfo *ci;
 657         git_revwalk *w = NULL;
 658         git_oid id;
 659         char path[PATH_MAX], oidstr[GIT_OID_HEXSZ + 1];
 660         FILE *fpfile;
 661         int r;
 662
 663         git_revwalk_new(&w, repo);
 664         git_revwalk_push(w, oid);
 665         git_revwalk_simplify_first_parent(w);
 666
 667         while (!git_revwalk_next(&id, w)) {
 668                 relpath = "";
 669
 670                 if (cachefile && !memcmp(&id, &lastoid, sizeof(id)))
 671                         break;
 672
 673                 git_oid_tostr(oidstr, sizeof(oidstr), &id);
 674                 r = snprintf(path, sizeof(path), "commit/%s.html", oidstr);
 675                 if (r < 0 || (size_t)r >= sizeof(path))
 676                         errx(1, "path truncated: 'commit/%s.html'", oidstr);
 677                 r = access(path, F_OK);
 678
 679                 /* optimization: if there are no log lines to write and
 680                    the commit file already exists: skip the diffstat */
 681                 if (!nlogcommits && !r)
 682                         continue;
 683
 684                 if (!(ci = commitinfo_getbyoid(&id)))
 685                         break;
 686                 /* diffstat: for stagit HTML required for the log.html line */
 687                 if (commitinfo_getstats(ci) == -1)
 688                         goto err;
 689
 690                 if (nlogcommits < 0) {
 691                         writelogline(fp, ci);
 692                 } else if (nlogcommits > 0) {
 693                         writelogline(fp, ci);
 694                         nlogcommits--;
 695                         if (!nlogcommits && ci->parentoid[0])
 696                                 fputs("<tr><td></td><td colspan=\"5\">"
 697                                       "More commits remaining [...]</td>"
 698                                       "</tr>\n", fp);
 699                 }
 700
 701                 if (cachefile)
 702                         writelogline(wcachefp, ci);
 703
 704                 /* check if file exists if so skip it */
 705                 if (r) {
 706                         relpath = "../";
 707                         fpfile = efopen(path, "w");
 708                         writeheader(fpfile, ci->summary);
 709                         fputs("<pre>", fpfile);
 710                         printshowfile(fpfile, ci);
 711                         fputs("</pre>\n", fpfile);
 712                         writefooter(fpfile);
 713                         fclose(fpfile);
 714                 }
 715 err:
 716                 commitinfo_free(ci);
 717         }
 718         git_revwalk_free(w);
 719
 720         relpath = "";
 721
 722         return 0;
 723 }
 724
 725 void
 726 printcommitatom(FILE *fp, struct commitinfo *ci)
 727 {
 728         fputs("<entry>\n", fp);
 729
 730         fprintf(fp, "<id>%s</id>\n", ci->oid);
 731         if (ci->author) {
 732                 fputs("<published>", fp);
 733                 printtimez(fp, &(ci->author->when));
 734                 fputs("</published>\n", fp);
 735         }
 736         if (ci->committer) {
 737                 fputs("<updated>", fp);
 738                 printtimez(fp, &(ci->committer->when));
 739                 fputs("</updated>\n", fp);
 740         }
 741         if (ci->summary) {
 742                 fputs("<title type=\"text\">", fp);
 743                 xmlencode(fp, ci->summary, strlen(ci->summary));
 744                 fputs("</title>\n", fp);
 745         }
 746         fprintf(fp, "<link rel=\"alternate\" type=\"text/html\" href=\"commit/%s.html\" />\n",
 747                 ci->oid);
 748
 749         if (ci->author) {
 750                 fputs("<author>\n<name>", fp);
 751                 xmlencode(fp, ci->author->name, strlen(ci->author->name));
 752                 fputs("</name>\n<email>", fp);
 753                 xmlencode(fp, ci->author->email, strlen(ci->author->email));
 754                 fputs("</email>\n</author>\n", fp);
 755         }
 756
 757         fputs("<content type=\"text\">", fp);
 758         fprintf(fp, "commit %s\n", ci->oid);
 759         if (ci->parentoid[0])
 760                 fprintf(fp, "parent %s\n", ci->parentoid);
 761         if (ci->author) {
 762                 fputs("Author: ", fp);
 763                 xmlencode(fp, ci->author->name, strlen(ci->author->name));
 764                 fputs(" &lt;", fp);
 765                 xmlencode(fp, ci->author->email, strlen(ci->author->email));
 766                 fputs("&gt;\nDate:   ", fp);
 767                 printtime(fp, &(ci->author->when));
 768                 fputc('\n', fp);
 769         }
 770         if (ci->msg) {
 771                 fputc('\n', fp);
 772                 xmlencode(fp, ci->msg, strlen(ci->msg));
 773         }
 774         fputs("\n</content>\n</entry>\n", fp);
 775 }
 776
 777 int
 778 writeatom(FILE *fp)
 779 {
 780         struct commitinfo *ci;
 781         git_revwalk *w = NULL;
 782         git_oid id;
 783         size_t i, m = 100; /* last 'm' commits */
 784
 785         fputs("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
 786               "<feed xmlns=\"http://www.w3.org/2005/Atom\">\n<title>", fp);
 787         xmlencode(fp, strippedname, strlen(strippedname));
 788         fputs(", branch HEAD</title>\n<subtitle>", fp);
 789         xmlencode(fp, description, strlen(description));
 790         fputs("</subtitle>\n", fp);
 791
 792         git_revwalk_new(&w, repo);
 793         git_revwalk_push_head(w);
 794         git_revwalk_simplify_first_parent(w);
 795
 796         for (i = 0; i < m && !git_revwalk_next(&id, w); i++) {
 797                 if (!(ci = commitinfo_getbyoid(&id)))
 798                         break;
 799                 printcommitatom(fp, ci);
 800                 commitinfo_free(ci);
 801         }
 802         git_revwalk_free(w);
 803
 804         fputs("</feed>\n", fp);
 805
 806         return 0;
 807 }
 808
 809 float
 810 rounder(float var)
 811 {
 812     int value = var * 10 + .5;
 813     return value / 10.0;
 814 }
 815
 816 const char *
 817 convertbytes(int bytes)
 818 {
 819         bytes = (float)bytes;
 820         static char outp[25];
 821         if (bytes < 1024) sprintf(outp, "%u %s", bytes, "B");
 822         else if (bytes < 1048576) sprintf(outp, "%0.1f %s", rounder(bytes/1024.0), "K");
 823         else sprintf(outp, "%0.1f %s", rounder(bytes/1048576.0), "M");
 824         return outp;
 825 }
 826
 827 void
 828 writeblob(git_object *obj, const char *fpath, const char *filename, git_off_t filesize)
 829 {
 830         char tmp[PATH_MAX] = "", *d;
 831         const char *p;
 832         FILE *fp;
 833
 834         if (strlcpy(tmp, fpath, sizeof(tmp)) >= sizeof(tmp))
 835                 errx(1, "path truncated: '%s'", fpath);
 836         if (!(d = dirname(tmp)))
 837                 err(1, "dirname");
 838         mkdirp(d);
 839
 840         for (p = fpath, tmp[0] = '\0'; *p; p++) {
 841                 if (*p == '/' && strlcat(tmp, "../", sizeof(tmp)) >= sizeof(tmp))
 842                         errx(1, "path truncated: '../%s'", tmp);
 843         }
 844         relpath = tmp;
 845
 846         fp = efopen(fpath, "w");
 847         writeheader(fp, filename);
 848         fputs("<p> ", fp);
 849         xmlencode(fp, filename, strlen(filename));
 850         fprintf(fp, " (%s)", convertbytes((int)filesize));
 851         fputs("</p><hr/>", fp);
 852
 853         if (git_blob_is_binary((git_blob *)obj)) {
 854                 fputs("<p>Binary file.</p>\n", fp);
 855         } else {
 856                 writeblobhtml(filename, fp, (git_blob *)obj);
 857                 if (ferror(fp))
 858                         err(1, "fwrite");
 859                 else if (htmlized) {
 860                         /* NOTE: recurses */
 861                         char newfpath[PATH_MAX];
 862                         strcat(newfpath, fpath);
 863                         char newfilename[PATH_MAX];
 864                         strcat(newfilename, filename);
 865                         writeblob(obj, strcat(newfpath, "-raw"), strcat(newfilename, "-raw"), filesize);
 866                         // TODO: Add view-raw button
 867                 }
 868         }
 869
 870         writefooter(fp);
 871         fclose(fp);
 872
 873         relpath = "";
 874 }
 875
 876 const char *
 877 filemode(git_filemode_t m)
 878 {
 879         static char mode[11];
 880
 881         memset(mode, '-', sizeof(mode) - 1);
 882         mode[10] = '\0';
 883
 884         if (S_ISREG(m))
 885                 mode[0] = '-';
 886         else if (S_ISBLK(m))
 887                 mode[0] = 'b';
 888         else if (S_ISCHR(m))
 889                 mode[0] = 'c';
 890         else if (S_ISDIR(m))
 891                 mode[0] = 'd';
 892         else if (S_ISFIFO(m))
 893                 mode[0] = 'p';
 894         else if (S_ISLNK(m))
 895                 mode[0] = 'l';
 896         else if (S_ISSOCK(m))
 897                 mode[0] = 's';
 898         else
 899                 mode[0] = '?';
 900
 901         if (m & S_IRUSR) mode[1] = 'r';
 902         if (m & S_IWUSR) mode[2] = 'w';
 903         if (m & S_IXUSR) mode[3] = 'x';
 904         if (m & S_IRGRP) mode[4] = 'r';
 905         if (m & S_IWGRP) mode[5] = 'w';
 906         if (m & S_IXGRP) mode[6] = 'x';
 907         if (m & S_IROTH) mode[7] = 'r';
 908         if (m & S_IWOTH) mode[8] = 'w';
 909         if (m & S_IXOTH) mode[9] = 'x';
 910
 911         if (m & S_ISUID) mode[3] = (mode[3] == 'x') ? 's' : 'S';
 912         if (m & S_ISGID) mode[6] = (mode[6] == 'x') ? 's' : 'S';
 913         if (m & S_ISVTX) mode[9] = (mode[9] == 'x') ? 't' : 'T';
 914
 915         return mode;
 916 }
 917
 918 int
 919 writefilestree(FILE *fp, git_tree *tree, const char *path)
 920 {
 921         const git_tree_entry *entry = NULL;
 922         git_submodule *module = NULL;
 923         git_object *obj = NULL;
 924         git_off_t filesize;
 925         const char *entryname;
 926         char filepath[PATH_MAX], entrypath[PATH_MAX];
 927         size_t count, i;
 928         int r, ret;
 929
 930         count = git_tree_entrycount(tree);
 931         for (i = 0; i < count; i++) {
 932                 if (!(entry = git_tree_entry_byindex(tree, i)) ||
 933                     !(entryname = git_tree_entry_name(entry)))
 934                         return -1;
 935                 joinpath(entrypath, sizeof(entrypath), path, entryname);
 936
 937                 r = snprintf(filepath, sizeof(filepath), "file/%s.html",
 938                          entrypath);
 939                 if (r < 0 || (size_t)r >= sizeof(filepath))
 940                         errx(1, "path truncated: 'file/%s.html'", entrypath);
 941
 942                 if (!git_tree_entry_to_object(&obj, repo, entry)) {
 943                         switch (git_object_type(obj)) {
 944                         case GIT_OBJ_BLOB:
 945                                 break;
 946                         case GIT_OBJ_TREE:
 947                                 /* NOTE: recurses */
 948                                 ret = writefilestree(fp, (git_tree *)obj,
 949                                                      entrypath);
 950                                 git_object_free(obj);
 951                                 if (ret)
 952                                         return ret;
 953                                 continue;
 954                         default:
 955                                 git_object_free(obj);
 956                                 continue;
 957                         }
 958
 959                         filesize = git_blob_rawsize((git_blob *)obj);
 960                         writeblob(obj, filepath, entryname, filesize);
 961
 962                         fputs("<tr><td>", fp);
 963                         fputs(filemode(git_tree_entry_filemode(entry)), fp);
 964                         fprintf(fp, "</td><td><a href=\"%s", relpath);
 965                         xmlencode(fp, filepath, strlen(filepath));
 966                         fputs("\">", fp);
 967                         xmlencode(fp, entrypath, strlen(entrypath));
 968                         fputs("</a></td><td class=\"num\" align=\"right\">", fp);
 969                         fprintf(fp, "%s", convertbytes((int)filesize));
 970                         fputs("</td></tr>\n", fp);
 971                         git_object_free(obj);
 972                 } else if (!git_submodule_lookup(&module, repo, entryname)) {
 973                         fprintf(fp, "<tr><td>m---------</td><td><a href=\"%sfile/.gitmodules.html\">",
 974                                 relpath);
 975                         xmlencode(fp, entrypath, strlen(entrypath));
 976                         git_submodule_free(module);
 977                         fputs("</a></td><td class=\"num\" align=\"right\"></td></tr>\n", fp);
 978                 }
 979         }
 980
 981         return 0;
 982 }
 983
 984 int
 985 writefiles(FILE *fp, const git_oid *id)
 986 {
 987         git_tree *tree = NULL;
 988         git_commit *commit = NULL;
 989         int ret = -1;
 990
 991         fputs("<table id=\"files\"><thead>\n<tr>"
 992               "<td><b>Mode</b></td><td><b>Name</b></td>"
 993               "<td class=\"num\" align=\"right\"><b>Size</b></td>"
 994               "</tr>\n</thead><tbody>\n", fp);
 995
 996         if (!git_commit_lookup(&commit, repo, id) &&
 997             !git_commit_tree(&tree, commit))
 998                 ret = writefilestree(fp, tree, "");
 999
1000         fputs("</tbody></table>", fp);
1001
1002         git_commit_free(commit);
1003         git_tree_free(tree);
1004
1005         return ret;
1006 }
1007
1008 int
1009 refs_cmp(const void *v1, const void *v2)
1010 {
1011         git_reference *r1 = (*(git_reference **)v1);
1012         git_reference *r2 = (*(git_reference **)v2);
1013         int r;
1014
1015         if ((r = git_reference_is_branch(r1) - git_reference_is_branch(r2)))
1016                 return r;
1017
1018         return strcmp(git_reference_shorthand(r1),
1019                       git_reference_shorthand(r2));
1020 }
1021
1022 int
1023 writerefs(FILE *fp)
1024 {
1025         struct commitinfo *ci;
1026         const git_oid *id = NULL;
1027         git_object *obj = NULL;
1028         git_reference *dref = NULL, *r, *ref = NULL;
1029         git_reference_iterator *it = NULL;
1030         git_reference **refs = NULL;
1031         size_t count, i, j, refcount;
1032         const char *titles[] = { "Branches", "Tags" };
1033         const char *ids[] = { "branches", "tags" };
1034         const char *name;
1035
1036         if (git_reference_iterator_new(&it, repo))
1037                 return -1;
1038
1039         for (refcount = 0; !git_reference_next(&ref, it); refcount++) {
1040                 if (!(refs = reallocarray(refs, refcount + 1, sizeof(git_reference *))))
1041                         err(1, "realloc");
1042                 refs[refcount] = ref;
1043         }
1044         git_reference_iterator_free(it);
1045
1046         /* sort by type then shorthand name */
1047         qsort(refs, refcount, sizeof(git_reference *), refs_cmp);
1048
1049         for (j = 0; j < 2; j++) {
1050                 for (i = 0, count = 0; i < refcount; i++) {
1051                         if (!(git_reference_is_branch(refs[i]) && j == 0) &&
1052                             !(git_reference_is_tag(refs[i]) && j == 1))
1053                                 continue;
1054
1055                         switch (git_reference_type(refs[i])) {
1056                         case GIT_REF_SYMBOLIC:
1057                                 if (git_reference_resolve(&dref, refs[i]))
1058                                         goto err;
1059                                 r = dref;
1060                                 break;
1061                         case GIT_REF_OID:
1062                                 r = refs[i];
1063                                 break;
1064                         default:
1065                                 continue;
1066                         }
1067                         if (!git_reference_target(r) ||
1068                             git_reference_peel(&obj, r, GIT_OBJ_ANY))
1069                                 goto err;
1070                         if (!(id = git_object_id(obj)))
1071                                 goto err;
1072                         if (!(ci = commitinfo_getbyoid(id)))
1073                                 break;
1074
1075                         /* print header if it has an entry (first). */
1076                         if (++count == 1) {
1077                                 fprintf(fp, "<h2>%s</h2><table id=\"%s\">"
1078                                         "<thead>\n<tr><td><b>Name</b></td>"
1079                                         "<td><b>Last commit date</b></td>"
1080                                         "<td><b>Author</b></td>\n</tr>\n"
1081                                         "</thead><tbody>\n",
1082                                          titles[j], ids[j]);
1083                         }
1084
1085                         relpath = "";
1086                         name = git_reference_shorthand(r);
1087
1088                         fputs("<tr><td>", fp);
1089                         xmlencode(fp, name, strlen(name));
1090                         fputs("</td><td>", fp);
1091                         if (ci->author)
1092                                 printtimeshort(fp, &(ci->author->when));
1093                         fputs("</td><td>", fp);
1094                         if (ci->author)
1095                                 xmlencode(fp, ci->author->name, strlen(ci->author->name));
1096                         fputs("</td></tr>\n", fp);
1097
1098                         relpath = "../";
1099
1100                         commitinfo_free(ci);
1101                         git_object_free(obj);
1102                         obj = NULL;
1103                         git_reference_free(dref);
1104                         dref = NULL;
1105                 }
1106                 /* table footer */
1107                 if (count)
1108                         fputs("</tbody></table><br/>", fp);
1109         }
1110
1111 err:
1112         git_object_free(obj);
1113         git_reference_free(dref);
1114
1115         for (i = 0; i < refcount; i++)
1116                 git_reference_free(refs[i]);
1117         free(refs);
1118
1119         return 0;
1120 }
1121
1122 void
1123 usage(char *argv0)
1124 {
1125         fprintf(stderr, "%s [-c cachefile | -l commits] repodir\n", argv0);
1126         exit(1);
1127 }
1128
1129 int
1130 main(int argc, char *argv[])
1131 {
1132         git_object *obj = NULL;
1133         const git_oid *head = NULL;
1134         mode_t mask;
1135         FILE *fp, *fpread;
1136         char path[PATH_MAX], repodirabs[PATH_MAX + 1], *p;
1137         char tmppath[64] = "cache.XXXXXXXXXXXX", buf[BUFSIZ];
1138         size_t n;
1139         int i, fd;
1140
1141         for (i = 1; i < argc; i++) {
1142                 if (argv[i][0] != '-') {
1143                         if (repodir)
1144                                 usage(argv[0]);
1145                         repodir = argv[i];
1146                 } else if (argv[i][1] == 'c') {
1147                         if (nlogcommits > 0 || i + 1 >= argc)
1148                                 usage(argv[0]);
1149                         cachefile = argv[++i];
1150                 } else if (argv[i][1] == 'l') {
1151                         if (cachefile || i + 1 >= argc)
1152                                 usage(argv[0]);
1153                         errno = 0;
1154                         nlogcommits = strtoll(argv[++i], &p, 10);
1155                         if (argv[i][0] == '\0' || *p != '\0' ||
1156                             nlogcommits <= 0 || errno)
1157                                 usage(argv[0]);
1158                 }
1159         }
1160         if (!repodir)
1161                 usage(argv[0]);
1162
1163         if (!realpath(repodir, repodirabs))
1164                 err(1, "realpath");
1165
1166         git_libgit2_init();
1167
1168 #ifdef __OpenBSD__
1169         if (unveil(repodir, "r") == -1)
1170                 err(1, "unveil: %s", repodir);
1171         if (unveil(".", "rwc") == -1)
1172                 err(1, "unveil: .");
1173         if (cachefile && unveil(cachefile, "rwc") == -1)
1174                 err(1, "unveil: %s", cachefile);
1175
1176         if (cachefile) {
1177                 if (pledge("stdio rpath wpath cpath fattr", NULL) == -1)
1178                         err(1, "pledge");
1179         } else {
1180                 if (pledge("stdio rpath wpath cpath", NULL) == -1)
1181                         err(1, "pledge");
1182         }
1183 #endif
1184
1185         if (git_repository_open_ext(&repo, repodir,
1186                 GIT_REPOSITORY_OPEN_NO_SEARCH, NULL) < 0) {
1187                 fprintf(stderr, "%s: cannot open repository\n", argv[0]);
1188                 return 1;
1189         }
1190
1191         /* find HEAD */
1192         if (!git_revparse_single(&obj, repo, "HEAD"))
1193                 head = git_object_id(obj);
1194         git_object_free(obj);
1195
1196         /* use directory name as name */
1197         if ((name = strrchr(repodirabs, '/')))
1198                 name++;
1199         else
1200                 name = "";
1201
1202         /* copy css */
1203         char cwd[PATH_MAX];
1204         strcpy(cwd, getcwd(cwd, sizeof(cwd)));
1205         cp("/usr/local/share/stagit/syntax.css", strcat(cwd, "/syntax.css"));
1206         strcpy(cwd, getcwd(cwd, sizeof(cwd)));
1207         cp("/usr/local/share/stagit/style.css", strcat(cwd, "/style.css"));
1208
1209         /* strip .git suffix */
1210         if (!(strippedname = strdup(name)))
1211                 err(1, "strdup");
1212         if ((p = strrchr(strippedname, '.')))
1213                 if (!strcmp(p, ".git"))
1214                         *p = '\0';
1215
1216         /* read description or .git/description */
1217         joinpath(path, sizeof(path), repodir, "description");
1218         if (!(fpread = fopen(path, "r"))) {
1219                 joinpath(path, sizeof(path), repodir, ".git/description");
1220                 fpread = fopen(path, "r");
1221         }
1222         if (fpread) {
1223                 if (!fgets(description, sizeof(description), fpread))
1224                         description[0] = '\0';
1225                 fclose(fpread);
1226         }
1227
1228         /* read url or .git/url */
1229         joinpath(path, sizeof(path), repodir, "url");
1230         if (!(fpread = fopen(path, "r"))) {
1231                 joinpath(path, sizeof(path), repodir, ".git/url");
1232                 fpread = fopen(path, "r");
1233         }
1234         if (fpread) {
1235                 if (!fgets(cloneurl, sizeof(cloneurl), fpread))
1236                         cloneurl[0] = '\0';
1237                 cloneurl[strcspn(cloneurl, "\n")] = '\0';
1238                 fclose(fpread);
1239         }
1240
1241         /* check LICENSE */
1242         for (i = 0; i < sizeof(licensefiles) / sizeof(*licensefiles) && !license; i++) {
1243                 if (!git_revparse_single(&obj, repo, licensefiles[i]) &&
1244                     git_object_type(obj) == GIT_OBJ_BLOB)
1245                         license = licensefiles[i] + strlen("HEAD:");
1246                 git_object_free(obj);
1247         }
1248
1249         /* check README */
1250         for (i = 0; i < sizeof(readmefiles) / sizeof(*readmefiles) && !readme; i++) {
1251                 if (!git_revparse_single(&obj, repo, readmefiles[i]) &&
1252                     git_object_type(obj) == GIT_OBJ_BLOB)
1253                         readme = readmefiles[i] + strlen("HEAD:");
1254                 git_object_free(obj);
1255         }
1256
1257         if (!git_revparse_single(&obj, repo, "HEAD:.gitmodules") &&
1258             git_object_type(obj) == GIT_OBJ_BLOB)
1259                 submodules = ".gitmodules";
1260         git_object_free(obj);
1261
1262         /* Generate tarball */
1263         char tarball[255];
1264         sprintf(tarball, "tar -zcf %s.tar.gz --ignore-failed-read --exclude='.git' %s",
1265                             strippedname, repodir);
1266         system(tarball);
1267
1268         /* log for HEAD */
1269         fp = efopen("log.html", "w");
1270         relpath = "";
1271         mkdir("commit", S_IRWXU | S_IRWXG | S_IRWXO);
1272         writeheader(fp, "Log");
1273         fputs("<table id=\"log\"><thead>\n<tr><td><b>Date</b></td>"
1274               "<td><b>Commit</b></td>"
1275               "<td><b>Author</b></td><td class=\"num\" align=\"right\"><b>Files</b></td>"
1276               "<td class=\"num\" align=\"right\"><b>+</b></td>"
1277               "<td class=\"num\" align=\"right\"><b>-</b></td></tr>\n</thead><tbody>\n", fp);
1278
1279         if (cachefile && head) {
1280                 /* read from cache file (does not need to exist) */
1281                 if ((rcachefp = fopen(cachefile, "r"))) {
1282                         if (!fgets(lastoidstr, sizeof(lastoidstr), rcachefp))
1283                                 errx(1, "%s: no object id", cachefile);
1284                         if (git_oid_fromstr(&lastoid, lastoidstr))
1285                                 errx(1, "%s: invalid object id", cachefile);
1286                 }
1287
1288                 /* write log to (temporary) cache */
1289                 if ((fd = mkstemp(tmppath)) == -1)
1290                         err(1, "mkstemp");
1291                 if (!(wcachefp = fdopen(fd, "w")))
1292                         err(1, "fdopen: '%s'", tmppath);
1293                 /* write last commit id (HEAD) */
1294                 git_oid_tostr(buf, sizeof(buf), head);
1295                 fprintf(wcachefp, "%s\n", buf);
1296
1297                 writelog(fp, head);
1298
1299                 if (rcachefp) {
1300                         /* append previous log to log.html and the new cache */
1301                         while (!feof(rcachefp)) {
1302                                 n = fread(buf, 1, sizeof(buf), rcachefp);
1303                                 if (ferror(rcachefp))
1304                                         err(1, "fread");
1305                                 if (fwrite(buf, 1, n, fp) != n ||
1306                                     fwrite(buf, 1, n, wcachefp) != n)
1307                                         err(1, "fwrite");
1308                         }
1309                         fclose(rcachefp);
1310                 }
1311                 fclose(wcachefp);
1312         } else {
1313                 if (head)
1314                         writelog(fp, head);
1315         }
1316
1317         fputs("</tbody></table>", fp);
1318         writefooter(fp);
1319         fclose(fp);
1320
1321         /* files for HEAD */
1322         fp = efopen("files.html", "w");
1323         writeheader(fp, "Files");
1324         if (head)
1325                 writefiles(fp, head);
1326         writefooter(fp);
1327         fclose(fp);
1328
1329         cp("files.html", "index.html");
1330
1331         /* summary page with branches and tags */
1332         fp = efopen("refs.html", "w");
1333         writeheader(fp, "Refs");
1334         writerefs(fp);
1335         writefooter(fp);
1336         fclose(fp);
1337
1338         /* Atom feed */
1339         fp = efopen("atom.xml", "w");
1340         writeatom(fp);
1341         fclose(fp);
1342
1343         /* rename new cache file on success */
1344         if (cachefile && head) {
1345                 if (rename(tmppath, cachefile))
1346                         err(1, "rename: '%s' to '%s'", tmppath, cachefile);
1347                 umask((mask = umask(0)));
1348                 if (chmod(cachefile,
1349                     (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH) & ~mask))
1350                         err(1, "chmod: '%s'", cachefile);
1351         }
1352
1353         /* cleanup */
1354         git_repository_free(repo);
1355         git_libgit2_shutdown();
1356
1357         return 0;
1358 }