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 "compat.h"
  23 #include "cp.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 *baseurl = ""; /* base URL to make absolute RSS/Atom URI */
  60 static const char *relpath = "";
  61 static const char *repodir;
  62
  63 static char *name = "";
  64 static char *strippedname = "";
  65 static char description[255];
  66 static char cloneurl[1024];
  67 static char *submodules;
  68 static char *licensefiles[] = { "HEAD:LICENSE", "HEAD:LICENSE.md", "HEAD:COPYING" };
  69 static char *license;
  70 static char *readmefiles[] = { "HEAD:README", "HEAD:README.md" };
  71 static char *readme;
  72 static long long nlogcommits = -1; /* < 0 indicates not used */
  73
  74 bool htmlized; /* true if markdoown converted to HTML */
  75 static char oldfilename[PATH_MAX]; /* filename of the last file */
  76
  77 /* cache */
  78 static git_oid lastoid;
  79 static char lastoidstr[GIT_OID_HEXSZ + 2]; /* id + newline + NUL byte */
  80 static FILE *rcachefp, *wcachefp;
  81 static const char *cachefile;
  82
  83 void
  84 joinpath(char *buf, size_t bufsiz, const char *path, const char *path2)
  85 {
  86         int r;
  87
  88         r = snprintf(buf, bufsiz, "%s%s%s",
  89                 path, path[0] && path[strlen(path) - 1] != '/' ? "/" : "", path2);
  90         if (r < 0 || (size_t)r >= bufsiz)
  91                 errx(1, "path truncated: '%s%s%s'",
  92                         path, path[0] && path[strlen(path) - 1] != '/' ? "/" : "", path2);
  93 }
  94
  95 void
  96 deltainfo_free(struct deltainfo *di)
  97 {
  98         if (!di)
  99                 return;
 100         git_patch_free(di->patch);
 101         memset(di, 0, sizeof(*di));
 102         free(di);
 103 }
 104
 105 int
 106 commitinfo_getstats(struct commitinfo *ci)
 107 {
 108         struct deltainfo *di;
 109         git_diff_options opts;
 110         git_diff_find_options fopts;
 111         const git_diff_delta *delta;
 112         const git_diff_hunk *hunk;
 113         const git_diff_line *line;
 114         git_patch *patch = NULL;
 115         size_t ndeltas, nhunks, nhunklines;
 116         size_t i, j, k;
 117
 118         if (git_tree_lookup(&(ci->commit_tree), repo, git_commit_tree_id(ci->commit)))
 119                 goto err;
 120         if (!git_commit_parent(&(ci->parent), ci->commit, 0)) {
 121                 if (git_tree_lookup(&(ci->parent_tree), repo, git_commit_tree_id(ci->parent))) {
 122                         ci->parent = NULL;
 123                         ci->parent_tree = NULL;
 124                 }
 125         }
 126
 127         git_diff_init_options(&opts, GIT_DIFF_OPTIONS_VERSION);
 128         opts.flags |= GIT_DIFF_DISABLE_PATHSPEC_MATCH |
 129                       GIT_DIFF_IGNORE_SUBMODULES |
 130                       GIT_DIFF_INCLUDE_TYPECHANGE;
 131         if (git_diff_tree_to_tree(&(ci->diff), repo, ci->parent_tree, ci->commit_tree, &opts))
 132                 goto err;
 133
 134         if (git_diff_find_init_options(&fopts, GIT_DIFF_FIND_OPTIONS_VERSION))
 135                 goto err;
 136         /* find renames and copies, exact matches (no heuristic) for renames. */
 137         fopts.flags |= GIT_DIFF_FIND_RENAMES | GIT_DIFF_FIND_COPIES |
 138                        GIT_DIFF_FIND_EXACT_MATCH_ONLY;
 139         if (git_diff_find_similar(ci->diff, &fopts))
 140                 goto err;
 141
 142         ndeltas = git_diff_num_deltas(ci->diff);
 143         if (ndeltas && !(ci->deltas = calloc(ndeltas, sizeof(struct deltainfo *))))
 144                 err(1, "calloc");
 145
 146         for (i = 0; i < ndeltas; i++) {
 147                 if (git_patch_from_diff(&patch, ci->diff, i))
 148                         goto err;
 149
 150                 if (!(di = calloc(1, sizeof(struct deltainfo))))
 151                         err(1, "calloc");
 152                 di->patch = patch;
 153                 ci->deltas[i] = di;
 154
 155                 delta = git_patch_get_delta(patch);
 156
 157                 /* skip stats for binary data */
 158                 if (delta->flags & GIT_DIFF_FLAG_BINARY)
 159                         continue;
 160
 161                 nhunks = git_patch_num_hunks(patch);
 162                 for (j = 0; j < nhunks; j++) {
 163                         if (git_patch_get_hunk(&hunk, &nhunklines, patch, j))
 164                                 break;
 165                         for (k = 0; ; k++) {
 166                                 if (git_patch_get_line_in_hunk(&line, patch, j, k))
 167                                         break;
 168                                 if (line->old_lineno == -1) {
 169                                         di->addcount++;
 170                                         ci->addcount++;
 171                                 } else if (line->new_lineno == -1) {
 172                                         di->delcount++;
 173                                         ci->delcount++;
 174                                 }
 175                         }
 176                 }
 177         }
 178         ci->ndeltas = i;
 179         ci->filecount = i;
 180
 181         return 0;
 182
 183 err:
 184         git_diff_free(ci->diff);
 185         ci->diff = NULL;
 186         git_tree_free(ci->commit_tree);
 187         ci->commit_tree = NULL;
 188         git_tree_free(ci->parent_tree);
 189         ci->parent_tree = NULL;
 190         git_commit_free(ci->parent);
 191         ci->parent = NULL;
 192
 193         if (ci->deltas)
 194                 for (i = 0; i < ci->ndeltas; i++)
 195                         deltainfo_free(ci->deltas[i]);
 196         free(ci->deltas);
 197         ci->deltas = NULL;
 198         ci->ndeltas = 0;
 199         ci->addcount = 0;
 200         ci->delcount = 0;
 201         ci->filecount = 0;
 202
 203         return -1;
 204 }
 205
 206 void
 207 commitinfo_free(struct commitinfo *ci)
 208 {
 209         size_t i;
 210
 211         if (!ci)
 212                 return;
 213         if (ci->deltas)
 214                 for (i = 0; i < ci->ndeltas; i++)
 215                         deltainfo_free(ci->deltas[i]);
 216
 217         free(ci->deltas);
 218         git_diff_free(ci->diff);
 219         git_tree_free(ci->commit_tree);
 220         git_tree_free(ci->parent_tree);
 221         git_commit_free(ci->commit);
 222         git_commit_free(ci->parent);
 223         memset(ci, 0, sizeof(*ci));
 224         free(ci);
 225 }
 226
 227 struct commitinfo *
 228 commitinfo_getbyoid(const git_oid *id)
 229 {
 230         struct commitinfo *ci;
 231
 232         if (!(ci = calloc(1, sizeof(struct commitinfo))))
 233                 err(1, "calloc");
 234
 235         if (git_commit_lookup(&(ci->commit), repo, id))
 236                 goto err;
 237         ci->id = id;
 238
 239         git_oid_tostr(ci->oid, sizeof(ci->oid), git_commit_id(ci->commit));
 240         git_oid_tostr(ci->parentoid, sizeof(ci->parentoid), git_commit_parent_id(ci->commit, 0));
 241
 242         ci->author = git_commit_author(ci->commit);
 243         ci->committer = git_commit_committer(ci->commit);
 244         ci->summary = git_commit_summary(ci->commit);
 245         ci->msg = git_commit_message(ci->commit);
 246
 247         return ci;
 248
 249 err:
 250         commitinfo_free(ci);
 251
 252         return NULL;
 253 }
 254
 255 FILE *
 256 efopen(const char *name, const char *flags)
 257 {
 258         FILE *fp;
 259
 260         if (!(fp = fopen(name, flags)))
 261                 err(1, "fopen: '%s'", name);
 262
 263         return fp;
 264 }
 265
 266 /* Escape characters below as HTML 2.0 / XML 1.0. */
 267 void
 268 xmlencode(FILE *fp, const char *s, size_t len)
 269 {
 270         size_t i;
 271
 272         for (i = 0; *s && i < len; s++, i++) {
 273                 switch(*s) {
 274                 case '<':  fputs("&lt;",   fp); break;
 275                 case '>':  fputs("&gt;",   fp); break;
 276                 case '\'': fputs("&#39;",  fp); break;
 277                 case '&':  fputs("&amp;",  fp); break;
 278                 case '"':  fputs("&quot;", fp); break;
 279                 default:   fputc(*s, fp);
 280                 }
 281         }
 282 }
 283
 284 /* Escape characters below as HTML 2.0 / XML 1.0, ignore printing '\n', '\r' */
 285 void
 286 xmlencodeline(FILE *fp, const char *s, size_t len)
 287 {
 288         size_t i;
 289         for (i = 0; *s && i < len; s++, i++) {
 290                 switch(*s) {
 291                 case '<':  fputs("&lt;",   fp); break;
 292                 case '>':  fputs("&gt;",   fp); break;
 293                 case '\'': fputs("&#39;",  fp); break;
 294                 case '&':  fputs("&amp;",  fp); break;
 295                 case '"':  fputs("&quot;", fp); break;
 296                 case '\r': break; /* ignore CR */
 297                 case '\n': break; /* ignore LF */
 298                 default:   putc(*s, fp);
 299                 }
 300         }
 301 }
 302
 303 int
 304 mkdirp(const char *path)
 305 {
 306         char tmp[PATH_MAX], *p;
 307
 308         if (strlcpy(tmp, path, sizeof(tmp)) >= sizeof(tmp))
 309                 errx(1, "path truncated: '%s'", path);
 310         for (p = tmp + (tmp[0] == '/'); *p; p++) {
 311                 if (*p != '/')
 312                         continue;
 313                 *p = '\0';
 314                 if (mkdir(tmp, S_IRWXU | S_IRWXG | S_IRWXO) < 0 && errno != EEXIST)
 315                         return -1;
 316                 *p = '/';
 317         }
 318         if (mkdir(tmp, S_IRWXU | S_IRWXG | S_IRWXO) < 0 && errno != EEXIST)
 319                 return -1;
 320         return 0;
 321 }
 322
 323 void
 324 printtimez(FILE *fp, const git_time *intime)
 325 {
 326         struct tm *intm;
 327         time_t t;
 328         char out[32];
 329
 330         t = (time_t)intime->time;
 331         if (!(intm = gmtime(&t)))
 332                 return;
 333         strftime(out, sizeof(out), "%Y-%m-%dT%H:%M:%SZ", intm);
 334         fputs(out, fp);
 335 }
 336
 337 void
 338 printtime(FILE *fp, const git_time *intime)
 339 {
 340         struct tm *intm;
 341         time_t t;
 342         char out[32];
 343
 344         t = (time_t)intime->time + (intime->offset * 60);
 345         if (!(intm = gmtime(&t)))
 346                 return;
 347         strftime(out, sizeof(out), "%a, %e %b %Y %H:%M:%S", intm);
 348         if (intime->offset < 0)
 349                 fprintf(fp, "%s -%02d%02d", out,
 350                             -(intime->offset) / 60, -(intime->offset) % 60);
 351         else
 352                 fprintf(fp, "%s +%02d%02d", out,
 353                             intime->offset / 60, intime->offset % 60);
 354 }
 355
 356 void
 357 printtimeshort(FILE *fp, const git_time *intime)
 358 {
 359         struct tm *intm;
 360         time_t t;
 361         char out[32];
 362
 363         t = (time_t)intime->time;
 364         if (!(intm = gmtime(&t)))
 365                 return;
 366         strftime(out, sizeof(out), "%Y-%m-%d %H:%M", intm);
 367         fputs(out, fp);
 368 }
 369
 370 void
 371 writeheader(FILE *fp, const char *title)
 372 {
 373         fputs("<!DOCTYPE html>\n"
 374                 "<html lang=\"en\">\n<head>\n"
 375                 "<meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\" />\n"
 376                 "<meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\" />\n"
 377                 "<title>", fp);
 378         xmlencode(fp, title, strlen(title));
 379         if (title[0] && strippedname[0])
 380                 fputs(" - ", fp);
 381         xmlencode(fp, strippedname, strlen(strippedname));
 382         if (description[0])
 383                 fputs(" - ", fp);
 384         xmlencode(fp, description, strlen(description));
 385         fprintf(fp, "</title>\n<link rel=\"icon\" type=\"image/png\" href=\"%sfavicon.png\" />\n", relpath);
 386         fprintf(fp, "<link rel=\"alternate\" type=\"application/atom+xml\" title=\"%s Atom Feed\" href=\"%satom.xml\" />\n",
 387                 name, relpath);
 388         fprintf(fp, "<link rel=\"stylesheet\" type=\"text/css\" href=\"%sstyle.css\" />\n", relpath);
 389         fprintf(fp, "<link rel=\"stylesheet\" type=\"text/css\" href=\"%ssyntax.css\" />\n", relpath);
 390         fputs("</head>\n<body>\n<table><tr><td>", fp);
 391         fprintf(fp, "<a href=\"../%s\"><img alt=\"Home\" src=\"%slogo.png\" alt=\"\" width=\"32\" height=\"32\" /></a>",
 392                 relpath, relpath);
 393         fputs("</td><td><h1>", fp);
 394         xmlencode(fp, strippedname, strlen(strippedname));
 395         fputs("</h1></td></tr><tr><td></td><td><span class=\"desc\">", fp);
 396         xmlencode(fp, description, strlen(description));
 397         fputs("</span></td></tr>", fp);
 398         if (cloneurl[0]) {
 399                 fputs("<tr class=\"url\"><td></td><td><span class=\"clone\">git clone <a href=\"", fp);
 400                 xmlencode(fp, cloneurl, strlen(cloneurl));
 401                 fputs("\">", fp);
 402                 xmlencode(fp, cloneurl, strlen(cloneurl));
 403                 fputs("</a></span></td></tr>", fp);
 404         }
 405         fputs("<tr><td></td><td>\n", fp);
 406         fprintf(fp, "<a href=\"%slog.html\">Log</a> | ", relpath);
 407         fprintf(fp, "<a href=\"%sfiles.html\">Files</a> | ", relpath);
 408         fprintf(fp, "<a href=\"%srefs.html\">Refs</a>", relpath);
 409         if (submodules)
 410                 fprintf(fp, " | <a href=\"%sfile/%s.html\">Submodules</a>",
 411                         relpath, submodules);
 412         if (readme)
 413                 fprintf(fp, " | <a href=\"%sfile/%s.html\">README</a>",
 414                         relpath, readme);
 415         if (license)
 416                 fprintf(fp, " | <a href=\"%sfile/%s.html\">LICENSE</a>",
 417                         relpath, license);
 418         fprintf(fp, " | <a href=\"%s%s.tar.gz\">Download</a>",
 419                                         relpath, strippedname);
 420         fputs("</td></tr></table>\n<hr/>\n<div id=\"content\">\n", fp);
 421 }
 422
 423 void
 424 writefooter(FILE *fp)
 425 {
 426         fputs("</div>\n</body>\n</html>\n", fp);
 427 }
 428
 429 const char *
 430 get_ext(const char *filename)
 431 {
 432         const char *dot = strrchr(filename, '.');
 433         if(!dot || dot == filename) return "";
 434         return dot + 1;
 435 }
 436
 437 void
 438 call_chroma(const char *filename, FILE *fp, const char *s, size_t len)
 439 {
 440         htmlized = false;
 441         char *html = "";
 442         // Flush HTML-file
 443         fflush(fp);
 444
 445 #ifdef HAS_CMARK
 446         html = cmark_markdown_to_html(s, len, CMARK_OPT_DEFAULT);
 447         if (strcmp(get_ext(filename), "md") == 0) htmlized = true;
 448 #endif
 449
 450 #ifdef HAS_CHROMA
 451         if (!htmlized) {
 452                 // Copy STDOUT
 453                 int stdout_copy = dup(1);
 454
 455                 // Redirect STDOUT
 456                 dup2(fileno(fp), 1);
 457
 458                 char cmd[255] = "chroma --html --html-only --html-lines --html-lines-table --filename ";
 459                 strncat(cmd, filename, strlen(filename) + 1);
 460                 FILE *child = popen(cmd, "w");
 461                 if (child == NULL) {
 462                         printf("child is null: %s", strerror(errno));
 463                         exit(1);
 464                 }
 465
 466                 // Give code to highlight through STDIN:
 467                 size_t i;
 468                 for (i = 0; *s && i < len; s++, i++) {
 469                         fprintf(child, "%c", *s);
 470                 }
 471
 472                 pclose(child);
 473                 fflush(stdout);
 474
 475                 // Give back STDOUT.
 476                 dup2(stdout_copy, 1);
 477
 478         } else {
 479                 fprintf(fp, "%s", html);
 480         }
 481 #else
 482                 fprintf(fp, "<pre>%s</pre>", s);
 483 #endif
 484                 free(html);
 485 }
 486
 487 void
 488 writeblobhtml(const char *filename, FILE *fp, const git_blob *blob)
 489 {
 490         const char *s = git_blob_rawcontent(blob);
 491         git_off_t len = git_blob_rawsize(blob);
 492
 493         if (len > 0) {
 494                 call_chroma(filename, fp, s, len);
 495         }
 496 }
 497
 498 void
 499 printcommit(FILE *fp, struct commitinfo *ci)
 500 {
 501         fprintf(fp, "<b>commit</b> <a href=\"%scommit/%s.html\">%s</a>\n",
 502                         relpath, ci->oid, ci->oid);
 503
 504         if (ci->parentoid[0])
 505                 fprintf(fp, "<b>parent</b> <a href=\"%scommit/%s.html\">%s</a>\n",
 506                                 relpath, ci->parentoid, ci->parentoid);
 507
 508         if (ci->author) {
 509                 fputs("<b>Author:</b> ", fp);
 510                 xmlencode(fp, ci->author->name, strlen(ci->author->name));
 511                 fputs(" &lt;<a href=\"mailto:", fp);
 512                 xmlencode(fp, ci->author->email, strlen(ci->author->email));
 513                 fputs("\">", fp);
 514                 xmlencode(fp, ci->author->email, strlen(ci->author->email));
 515                 fputs("</a>&gt;\n<b>Date:</b>   ", fp);
 516                 printtime(fp, &(ci->author->when));
 517                 putc('\n', fp);
 518         }
 519         if (ci->msg) {
 520                 putc('\n', fp);
 521                 xmlencode(fp, ci->msg, strlen(ci->msg));
 522                 putc('\n', fp);
 523         }
 524 }
 525
 526 void
 527 printshowfile(FILE *fp, struct commitinfo *ci)
 528 {
 529         const git_diff_delta *delta;
 530         const git_diff_hunk *hunk;
 531         const git_diff_line *line;
 532         git_patch *patch;
 533         size_t nhunks, nhunklines, changed, add, del, total, i, j, k;
 534         char linestr[80];
 535         int c;
 536
 537         printcommit(fp, ci);
 538
 539         if (!ci->deltas)
 540                 return;
 541
 542         if (ci->filecount > 1000   ||
 543             ci->ndeltas   > 1000   ||
 544             ci->addcount  > 100000 ||
 545             ci->delcount  > 100000) {
 546                 fputs("Diff is too large, output suppressed.\n", fp);
 547                 return;
 548         }
 549
 550         /* diff stat */
 551         fputs("<b>Diffstat:</b>\n<table>", fp);
 552         for (i = 0; i < ci->ndeltas; i++) {
 553                 delta = git_patch_get_delta(ci->deltas[i]->patch);
 554
 555                 switch (delta->status) {
 556                 case GIT_DELTA_ADDED:      c = 'A'; break;
 557                 case GIT_DELTA_COPIED:     c = 'C'; break;
 558                 case GIT_DELTA_DELETED:    c = 'D'; break;
 559                 case GIT_DELTA_MODIFIED:   c = 'M'; break;
 560                 case GIT_DELTA_RENAMED:    c = 'R'; break;
 561                 case GIT_DELTA_TYPECHANGE: c = 'T'; break;
 562                 default:                   c = ' '; break;
 563                 }
 564                 if (c == ' ')
 565                         fprintf(fp, "<tr><td>%c", c);
 566                 else
 567                         fprintf(fp, "<tr><td class=\"%c\">%c", c, c);
 568
 569                 fprintf(fp, "</td><td><a href=\"#h%zu\">", i);
 570                 xmlencode(fp, delta->old_file.path, strlen(delta->old_file.path));
 571                 if (strcmp(delta->old_file.path, delta->new_file.path)) {
 572                         fputs(" -&gt; ", fp);
 573                         xmlencode(fp, delta->new_file.path, strlen(delta->new_file.path));
 574                 }
 575
 576                 add = ci->deltas[i]->addcount;
 577                 del = ci->deltas[i]->delcount;
 578                 changed = add + del;
 579                 total = sizeof(linestr) - 2;
 580                 if (changed > total) {
 581                         if (add)
 582                                 add = ((float)total / changed * add) + 1;
 583                         if (del)
 584                                 del = ((float)total / changed * del) + 1;
 585                 }
 586                 memset(&linestr, '+', add);
 587                 memset(&linestr[add], '-', del);
 588
 589                 fprintf(fp, "</a></td><td> | </td><td class=\"num\">%zu</td><td><span class=\"i\">",
 590                         ci->deltas[i]->addcount + ci->deltas[i]->delcount);
 591                 fwrite(&linestr, 1, add, fp);
 592                 fputs("</span><span class=\"d\">", fp);
 593                 fwrite(&linestr[add], 1, del, fp);
 594                 fputs("</span></td></tr>\n", fp);
 595         }
 596         fprintf(fp, "</table></pre><pre>%zu file%s changed, %zu insertion%s(+), %zu deletion%s(-)\n",
 597                 ci->filecount, ci->filecount == 1 ? "" : "s",
 598                 ci->addcount,  ci->addcount  == 1 ? "" : "s",
 599                 ci->delcount,  ci->delcount  == 1 ? "" : "s");
 600
 601         fputs("<hr/>", fp);
 602
 603         for (i = 0; i < ci->ndeltas; i++) {
 604                 patch = ci->deltas[i]->patch;
 605                 delta = git_patch_get_delta(patch);
 606                 fprintf(fp, "<b>diff --git a/<a id=\"h%zu\" href=\"%sfile/", i, relpath);
 607                 xmlencode(fp, delta->old_file.path, strlen(delta->old_file.path));
 608                 fputs(".html\">", fp);
 609                 xmlencode(fp, delta->old_file.path, strlen(delta->old_file.path));
 610                 fprintf(fp, "</a> b/<a href=\"%sfile/", relpath);
 611                 xmlencode(fp, delta->new_file.path, strlen(delta->new_file.path));
 612                 fprintf(fp, ".html\">");
 613                 xmlencode(fp, delta->new_file.path, strlen(delta->new_file.path));
 614                 fprintf(fp, "</a></b>\n");
 615
 616                 /* check binary data */
 617                 if (delta->flags & GIT_DIFF_FLAG_BINARY) {
 618                         fputs("Binary files differ.\n", fp);
 619                         continue;
 620                 }
 621
 622                 nhunks = git_patch_num_hunks(patch);
 623                 for (j = 0; j < nhunks; j++) {
 624                         if (git_patch_get_hunk(&hunk, &nhunklines, patch, j))
 625                                 break;
 626
 627                         fprintf(fp, "<a href=\"#h%zu-%zu\" id=\"h%zu-%zu\" class=\"h\">", i, j, i, j);
 628                         xmlencode(fp, hunk->header, hunk->header_len);
 629                         fputs("</a>", fp);
 630
 631                         for (k = 0; ; k++) {
 632                                 if (git_patch_get_line_in_hunk(&line, patch, j, k))
 633                                         break;
 634                                 if (line->old_lineno == -1)
 635                                         fprintf(fp, "<a href=\"#h%zu-%zu-%zu\" id=\"h%zu-%zu-%zu\" class=\"i\">+",
 636                                                 i, j, k, i, j, k);
 637                                 else if (line->new_lineno == -1)
 638                                         fprintf(fp, "<a href=\"#h%zu-%zu-%zu\" id=\"h%zu-%zu-%zu\" class=\"d\">-",
 639                                                 i, j, k, i, j, k);
 640                                 else
 641                                         putc(' ', fp);
 642                                 xmlencodeline(fp, line->content, line->content_len);
 643                                 putc('\n', fp);
 644                                 if (line->old_lineno == -1 || line->new_lineno == -1)
 645                                         fputs("</a>", fp);
 646                         }
 647                 }
 648         }
 649 }
 650
 651 void
 652 writelogline(FILE *fp, struct commitinfo *ci)
 653 {
 654         fputs("<tr><td>", fp);
 655         if (ci->author)
 656                 printtimeshort(fp, &(ci->author->when));
 657         fputs("</td><td>", fp);
 658         if (ci->summary) {
 659                 fprintf(fp, "<a href=\"%scommit/%s.html\">", relpath, ci->oid);
 660                 xmlencode(fp, ci->summary, strlen(ci->summary));
 661                 fputs("</a>", fp);
 662         }
 663         fputs("</td><td>", fp);
 664         if (ci->author)
 665                 xmlencode(fp, ci->author->name, strlen(ci->author->name));
 666         fputs("</td><td class=\"num\" align=\"right\">", fp);
 667         fprintf(fp, "%zu", ci->filecount);
 668         fputs("</td><td class=\"num\" align=\"right\">", fp);
 669         fprintf(fp, "+%zu", ci->addcount);
 670         fputs("</td><td class=\"num\" align=\"right\">", fp);
 671         fprintf(fp, "-%zu", ci->delcount);
 672         fputs("</td></tr>\n", fp);
 673 }
 674
 675 int
 676 writelog(FILE *fp, const git_oid *oid)
 677 {
 678         struct commitinfo *ci;
 679         git_revwalk *w = NULL;
 680         git_oid id;
 681         char path[PATH_MAX], oidstr[GIT_OID_HEXSZ + 1];
 682         FILE *fpfile;
 683         int r;
 684
 685         git_revwalk_new(&w, repo);
 686         git_revwalk_push(w, oid);
 687         git_revwalk_simplify_first_parent(w);
 688
 689         while (!git_revwalk_next(&id, w)) {
 690                 relpath = "";
 691
 692                 if (cachefile && !memcmp(&id, &lastoid, sizeof(id)))
 693                         break;
 694
 695                 git_oid_tostr(oidstr, sizeof(oidstr), &id);
 696                 r = snprintf(path, sizeof(path), "commit/%s.html", oidstr);
 697                 if (r < 0 || (size_t)r >= sizeof(path))
 698                         errx(1, "path truncated: 'commit/%s.html'", oidstr);
 699                 r = access(path, F_OK);
 700
 701                 /* optimization: if there are no log lines to write and
 702                    the commit file already exists: skip the diffstat */
 703                 if (!nlogcommits && !r)
 704                         continue;
 705
 706                 if (!(ci = commitinfo_getbyoid(&id)))
 707                         break;
 708                 /* diffstat: for stagit HTML required for the log.html line */
 709                 if (commitinfo_getstats(ci) == -1)
 710                         goto err;
 711
 712                 if (nlogcommits < 0) {
 713                         writelogline(fp, ci);
 714                 } else if (nlogcommits > 0) {
 715                         writelogline(fp, ci);
 716                         nlogcommits--;
 717                         if (!nlogcommits && ci->parentoid[0])
 718                                 fputs("<tr><td></td><td colspan=\"5\">"
 719                                       "More commits remaining [...]</td>"
 720                                       "</tr>\n", fp);
 721                 }
 722
 723                 if (cachefile)
 724                         writelogline(wcachefp, ci);
 725
 726                 /* check if file exists if so skip it */
 727                 if (r) {
 728                         relpath = "../";
 729                         fpfile = efopen(path, "w");
 730                         writeheader(fpfile, ci->summary);
 731                         fputs("<pre>", fpfile);
 732                         printshowfile(fpfile, ci);
 733                         fputs("</pre>\n", fpfile);
 734                         writefooter(fpfile);
 735                         fclose(fpfile);
 736                 }
 737 err:
 738                 commitinfo_free(ci);
 739         }
 740         git_revwalk_free(w);
 741
 742         relpath = "";
 743
 744         return 0;
 745 }
 746
 747 void
 748 printcommitatom(FILE *fp, struct commitinfo *ci)
 749 {
 750         fputs("<entry>\n", fp);
 751
 752         fprintf(fp, "<id>%s</id>\n", ci->oid);
 753         if (ci->author) {
 754                 fputs("<published>", fp);
 755                 printtimez(fp, &(ci->author->when));
 756                 fputs("</published>\n", fp);
 757         }
 758         if (ci->committer) {
 759                 fputs("<updated>", fp);
 760                 printtimez(fp, &(ci->committer->when));
 761                 fputs("</updated>\n", fp);
 762         }
 763         if (ci->summary) {
 764                 fputs("<title type=\"text\">", fp);
 765                 xmlencode(fp, ci->summary, strlen(ci->summary));
 766                 fputs("</title>\n", fp);
 767         }
 768         fprintf(fp, "<link rel=\"alternate\" type=\"text/html\" href=\"%scommit/%s.html\" />\n",
 769                 baseurl, ci->oid);
 770
 771         if (ci->author) {
 772                 fputs("<author>\n<name>", fp);
 773                 xmlencode(fp, ci->author->name, strlen(ci->author->name));
 774                 fputs("</name>\n<email>", fp);
 775                 xmlencode(fp, ci->author->email, strlen(ci->author->email));
 776                 fputs("</email>\n</author>\n", fp);
 777         }
 778
 779         fputs("<content type=\"text\">", fp);
 780         fprintf(fp, "commit %s\n", ci->oid);
 781         if (ci->parentoid[0])
 782                 fprintf(fp, "parent %s\n", ci->parentoid);
 783         if (ci->author) {
 784                 fputs("Author: ", fp);
 785                 xmlencode(fp, ci->author->name, strlen(ci->author->name));
 786                 fputs(" &lt;", fp);
 787                 xmlencode(fp, ci->author->email, strlen(ci->author->email));
 788                 fputs("&gt;\nDate:   ", fp);
 789                 printtime(fp, &(ci->author->when));
 790                 putc('\n', fp);
 791         }
 792         if (ci->msg) {
 793                 putc('\n', fp);
 794                 xmlencode(fp, ci->msg, strlen(ci->msg));
 795         }
 796         fputs("\n</content>\n</entry>\n", fp);
 797 }
 798
 799 int
 800 writeatom(FILE *fp)
 801 {
 802         struct commitinfo *ci;
 803         git_revwalk *w = NULL;
 804         git_oid id;
 805         size_t i, m = 100; /* last 'm' commits */
 806
 807         fputs("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
 808               "<feed xmlns=\"http://www.w3.org/2005/Atom\">\n<title>", fp);
 809         xmlencode(fp, strippedname, strlen(strippedname));
 810         fputs(", branch HEAD</title>\n<subtitle>", fp);
 811         xmlencode(fp, description, strlen(description));
 812         fputs("</subtitle>\n", fp);
 813
 814         git_revwalk_new(&w, repo);
 815         git_revwalk_push_head(w);
 816         git_revwalk_simplify_first_parent(w);
 817
 818         for (i = 0; i < m && !git_revwalk_next(&id, w); i++) {
 819                 if (!(ci = commitinfo_getbyoid(&id)))
 820                         break;
 821                 printcommitatom(fp, ci);
 822                 commitinfo_free(ci);
 823         }
 824         git_revwalk_free(w);
 825
 826         fputs("</feed>\n", fp);
 827
 828         return 0;
 829 }
 830
 831 float
 832 rounder(float var)
 833 {
 834     int value = var * 10 + .5;
 835     return value / 10.0;
 836 }
 837
 838 const char *
 839 convertbytes(int bytes)
 840 {
 841         bytes = (float)bytes;
 842         static char outp[25];
 843         if (bytes < 1024) sprintf(outp, "%u %s", bytes, "B");
 844         else if (bytes < 1048576) sprintf(outp, "%0.1f %s", rounder(bytes/1024.0), "K");
 845         else sprintf(outp, "%0.1f %s", rounder(bytes/1048576.0), "M");
 846         return outp;
 847 }
 848
 849 void
 850 writeblob(git_object *obj, const char *fpath, const char *filename, git_off_t filesize)
 851 {
 852         char tmp[PATH_MAX] = "", *d;
 853         const char *p;
 854         FILE *fp;
 855
 856         if (strlcpy(tmp, fpath, sizeof(tmp)) >= sizeof(tmp))
 857                 errx(1, "path truncated: '%s'", fpath);
 858         if (!(d = dirname(tmp)))
 859                 err(1, "dirname");
 860         mkdirp(d);
 861
 862         for (p = fpath, tmp[0] = '\0'; *p; p++) {
 863                 if (*p == '/' && strlcat(tmp, "../", sizeof(tmp)) >= sizeof(tmp))
 864                         errx(1, "path truncated: '../%s'", tmp);
 865         }
 866         relpath = tmp;
 867
 868         fp = efopen(fpath, "w");
 869         writeheader(fp, filename);
 870         fputs("<p> ", fp);
 871         xmlencode(fp, filename, strlen(filename));
 872         fprintf(fp, " (%s)", convertbytes((int)filesize));
 873
 874 #ifdef HAS_CMARK
 875         char newfpath[PATH_MAX];
 876         char newfilename[PATH_MAX];
 877         if (strcmp(get_ext(filename), "md") == 0) {
 878                 fprintf(fp, " <a href=\"%s.html-raw\">View raw</a>", filename);
 879                 strcpy(newfpath, fpath);
 880                 strcat(newfpath, "-raw");
 881
 882                 strcpy(newfilename, filename);
 883                 strcat(newfilename, "-raw");
 884                 strcpy(oldfilename, filename);
 885
 886                 /* NOTE: recurses */
 887                 writeblob(obj, newfpath, newfilename, filesize);
 888         } else if (strcmp(get_ext(filename), "md-raw" ) == 0) {
 889                 fprintf(fp, " <a href=\"%s.html\">View rendered</a>", oldfilename);
 890         }
 891 #endif
 892
 893         fputs(".</p><hr/>", fp);
 894
 895         if (git_blob_is_binary((git_blob *)obj)) {
 896                 fputs("<p>Binary file.</p>\n", fp);
 897         } else {
 898                 writeblobhtml(filename, fp, (git_blob *)obj);
 899                 if (ferror(fp))
 900                         err(1, "fwrite");
 901         }
 902
 903         writefooter(fp);
 904         fclose(fp);
 905
 906         relpath = "";
 907 }
 908
 909 const char *
 910 filemode(git_filemode_t m)
 911 {
 912         static char mode[11];
 913
 914         memset(mode, '-', sizeof(mode) - 1);
 915         mode[10] = '\0';
 916
 917         if (S_ISREG(m))
 918                 mode[0] = '-';
 919         else if (S_ISBLK(m))
 920                 mode[0] = 'b';
 921         else if (S_ISCHR(m))
 922                 mode[0] = 'c';
 923         else if (S_ISDIR(m))
 924                 mode[0] = 'd';
 925         else if (S_ISFIFO(m))
 926                 mode[0] = 'p';
 927         else if (S_ISLNK(m))
 928                 mode[0] = 'l';
 929         else if (S_ISSOCK(m))
 930                 mode[0] = 's';
 931         else
 932                 mode[0] = '?';
 933
 934         if (m & S_IRUSR) mode[1] = 'r';
 935         if (m & S_IWUSR) mode[2] = 'w';
 936         if (m & S_IXUSR) mode[3] = 'x';
 937         if (m & S_IRGRP) mode[4] = 'r';
 938         if (m & S_IWGRP) mode[5] = 'w';
 939         if (m & S_IXGRP) mode[6] = 'x';
 940         if (m & S_IROTH) mode[7] = 'r';
 941         if (m & S_IWOTH) mode[8] = 'w';
 942         if (m & S_IXOTH) mode[9] = 'x';
 943
 944         if (m & S_ISUID) mode[3] = (mode[3] == 'x') ? 's' : 'S';
 945         if (m & S_ISGID) mode[6] = (mode[6] == 'x') ? 's' : 'S';
 946         if (m & S_ISVTX) mode[9] = (mode[9] == 'x') ? 't' : 'T';
 947
 948         return mode;
 949 }
 950
 951 int
 952 writefilestree(FILE *fp, git_tree *tree, const char *path)
 953 {
 954         const git_tree_entry *entry = NULL;
 955         git_submodule *module = NULL;
 956         git_object *obj = NULL;
 957         git_off_t filesize;
 958         const char *entryname;
 959         char filepath[PATH_MAX], entrypath[PATH_MAX];
 960         size_t count, i;
 961         int r, ret;
 962
 963         count = git_tree_entrycount(tree);
 964         for (i = 0; i < count; i++) {
 965                 if (!(entry = git_tree_entry_byindex(tree, i)) ||
 966                     !(entryname = git_tree_entry_name(entry)))
 967                         return -1;
 968                 joinpath(entrypath, sizeof(entrypath), path, entryname);
 969
 970                 r = snprintf(filepath, sizeof(filepath), "file/%s.html",
 971                          entrypath);
 972                 if (r < 0 || (size_t)r >= sizeof(filepath))
 973                         errx(1, "path truncated: 'file/%s.html'", entrypath);
 974
 975                 if (!git_tree_entry_to_object(&obj, repo, entry)) {
 976                         switch (git_object_type(obj)) {
 977                         case GIT_OBJ_BLOB:
 978                                 break;
 979                         case GIT_OBJ_TREE:
 980                                 /* NOTE: recurses */
 981                                 ret = writefilestree(fp, (git_tree *)obj,
 982                                                      entrypath);
 983                                 git_object_free(obj);
 984                                 if (ret)
 985                                         return ret;
 986                                 continue;
 987                         default:
 988                                 git_object_free(obj);
 989                                 continue;
 990                         }
 991
 992                         filesize = git_blob_rawsize((git_blob *)obj);
 993                         writeblob(obj, filepath, entryname, filesize);
 994
 995                         fputs("<tr><td>", fp);
 996                         fputs(filemode(git_tree_entry_filemode(entry)), fp);
 997                         fprintf(fp, "</td><td><a href=\"%s", relpath);
 998                         xmlencode(fp, filepath, strlen(filepath));
 999                         fputs("\">", fp);
1000                         xmlencode(fp, entrypath, strlen(entrypath));
1001                         fputs("</a></td><td class=\"num\" align=\"right\">", fp);
1002                         fprintf(fp, "%s", convertbytes((int)filesize));
1003                         fputs("</td></tr>\n", fp);
1004                         git_object_free(obj);
1005                 } else if (!git_submodule_lookup(&module, repo, entryname)) {
1006                         fprintf(fp, "<tr><td>m---------</td><td><a href=\"%sfile/.gitmodules.html\">",
1007                                 relpath);
1008                         xmlencode(fp, entrypath, strlen(entrypath));
1009                         git_submodule_free(module);
1010                         fputs("</a></td><td class=\"num\" align=\"right\"></td></tr>\n", fp);
1011                 }
1012         }
1013
1014         return 0;
1015 }
1016
1017 int
1018 writefiles(FILE *fp, const git_oid *id)
1019 {
1020         git_tree *tree = NULL;
1021         git_commit *commit = NULL;
1022         int ret = -1;
1023
1024         fputs("<table id=\"files\"><thead>\n<tr>"
1025               "<td><b>Mode</b></td><td><b>Name</b></td>"
1026               "<td class=\"num\" align=\"right\"><b>Size</b></td>"
1027               "</tr>\n</thead><tbody>\n", fp);
1028
1029         if (!git_commit_lookup(&commit, repo, id) &&
1030             !git_commit_tree(&tree, commit))
1031                 ret = writefilestree(fp, tree, "");
1032
1033         fputs("</tbody></table>", fp);
1034
1035         git_commit_free(commit);
1036         git_tree_free(tree);
1037
1038         return ret;
1039 }
1040
1041 int
1042 refs_cmp(const void *v1, const void *v2)
1043 {
1044         git_reference *r1 = (*(git_reference **)v1);
1045         git_reference *r2 = (*(git_reference **)v2);
1046         int r;
1047
1048         if ((r = git_reference_is_branch(r1) - git_reference_is_branch(r2)))
1049                 return r;
1050
1051         return strcmp(git_reference_shorthand(r1),
1052                       git_reference_shorthand(r2));
1053 }
1054
1055 int
1056 writerefs(FILE *fp)
1057 {
1058         struct commitinfo *ci;
1059         const git_oid *id = NULL;
1060         git_object *obj = NULL;
1061         git_reference *dref = NULL, *r, *ref = NULL;
1062         git_reference_iterator *it = NULL;
1063         git_reference **refs = NULL;
1064         size_t count, i, j, refcount;
1065         const char *titles[] = { "Branches", "Tags" };
1066         const char *ids[] = { "branches", "tags" };
1067         const char *name;
1068
1069         if (git_reference_iterator_new(&it, repo))
1070                 return -1;
1071
1072         for (refcount = 0; !git_reference_next(&ref, it); refcount++) {
1073                 if (!(refs = reallocarray(refs, refcount + 1, sizeof(git_reference *))))
1074                         err(1, "realloc");
1075                 refs[refcount] = ref;
1076         }
1077         git_reference_iterator_free(it);
1078
1079         /* sort by type then shorthand name */
1080         qsort(refs, refcount, sizeof(git_reference *), refs_cmp);
1081
1082         for (j = 0; j < 2; j++) {
1083                 for (i = 0, count = 0; i < refcount; i++) {
1084                         if (!(git_reference_is_branch(refs[i]) && j == 0) &&
1085                             !(git_reference_is_tag(refs[i]) && j == 1))
1086                                 continue;
1087
1088                         switch (git_reference_type(refs[i])) {
1089                         case GIT_REF_SYMBOLIC:
1090                                 if (git_reference_resolve(&dref, refs[i]))
1091                                         goto err;
1092                                 r = dref;
1093                                 break;
1094                         case GIT_REF_OID:
1095                                 r = refs[i];
1096                                 break;
1097                         default:
1098                                 continue;
1099                         }
1100                         if (!git_reference_target(r) ||
1101                             git_reference_peel(&obj, r, GIT_OBJ_ANY))
1102                                 goto err;
1103                         if (!(id = git_object_id(obj)))
1104                                 goto err;
1105                         if (!(ci = commitinfo_getbyoid(id)))
1106                                 break;
1107
1108                         /* print header if it has an entry (first). */
1109                         if (++count == 1) {
1110                                 fprintf(fp, "<h2>%s</h2><table id=\"%s\">"
1111                                         "<thead>\n<tr><td><b>Name</b></td>"
1112                                         "<td><b>Last commit date</b></td>"
1113                                         "<td><b>Author</b></td>\n</tr>\n"
1114                                         "</thead><tbody>\n",
1115                                          titles[j], ids[j]);
1116                         }
1117
1118                         relpath = "";
1119                         name = git_reference_shorthand(r);
1120
1121                         fputs("<tr><td>", fp);
1122                         xmlencode(fp, name, strlen(name));
1123                         fputs("</td><td>", fp);
1124                         if (ci->author)
1125                                 printtimeshort(fp, &(ci->author->when));
1126                         fputs("</td><td>", fp);
1127                         if (ci->author)
1128                                 xmlencode(fp, ci->author->name, strlen(ci->author->name));
1129                         fputs("</td></tr>\n", fp);
1130
1131                         relpath = "../";
1132
1133                         commitinfo_free(ci);
1134                         git_object_free(obj);
1135                         obj = NULL;
1136                         git_reference_free(dref);
1137                         dref = NULL;
1138                 }
1139                 /* table footer */
1140                 if (count)
1141                         fputs("</tbody></table><br/>", fp);
1142         }
1143
1144 err:
1145         git_object_free(obj);
1146         git_reference_free(dref);
1147
1148         for (i = 0; i < refcount; i++)
1149                 git_reference_free(refs[i]);
1150         free(refs);
1151
1152         return 0;
1153 }
1154
1155 void
1156 usage(char *argv0)
1157 {
1158         fprintf(stderr, "%s [-c cachefile | -l commits] "
1159                 "[-u baseurl] repodir\n", argv0);
1160         exit(1);
1161 }
1162
1163 int
1164 main(int argc, char *argv[])
1165 {
1166         git_object *obj = NULL;
1167         const git_oid *head = NULL;
1168         mode_t mask;
1169         FILE *fp, *fpread;
1170         char path[PATH_MAX], repodirabs[PATH_MAX + 1], *p;
1171         char tmppath[64] = "cache.XXXXXXXXXXXX", buf[BUFSIZ];
1172         size_t n;
1173         int i, fd;
1174
1175         for (i = 1; i < argc; i++) {
1176                 if (argv[i][0] != '-') {
1177                         if (repodir)
1178                                 usage(argv[0]);
1179                         repodir = argv[i];
1180                 } else if (argv[i][1] == 'c') {
1181                         if (nlogcommits > 0 || i + 1 >= argc)
1182                                 usage(argv[0]);
1183                         cachefile = argv[++i];
1184                 } else if (argv[i][1] == 'l') {
1185                         if (cachefile || i + 1 >= argc)
1186                                 usage(argv[0]);
1187                         errno = 0;
1188                         nlogcommits = strtoll(argv[++i], &p, 10);
1189                         if (argv[i][0] == '\0' || *p != '\0' ||
1190                             nlogcommits <= 0 || errno)
1191                                 usage(argv[0]);
1192                 } else if (argv[i][1] == 'u') {
1193                         if (i + 1 >= argc)
1194                                 usage(argv[0]);
1195                         baseurl = argv[++i];
1196                 }
1197         }
1198         if (!repodir)
1199                 usage(argv[0]);
1200
1201         if (!realpath(repodir, repodirabs))
1202                 err(1, "realpath");
1203
1204         git_libgit2_init();
1205
1206 #ifdef __OpenBSD__
1207         if (unveil(repodir, "r") == -1)
1208                 err(1, "unveil: %s", repodir);
1209         if (unveil(".", "rwc") == -1)
1210                 err(1, "unveil: .");
1211         if (cachefile && unveil(cachefile, "rwc") == -1)
1212                 err(1, "unveil: %s", cachefile);
1213
1214         if (cachefile) {
1215                 if (pledge("stdio rpath wpath cpath fattr", NULL) == -1)
1216                         err(1, "pledge");
1217         } else {
1218                 if (pledge("stdio rpath wpath cpath", NULL) == -1)
1219                         err(1, "pledge");
1220         }
1221 #endif
1222
1223         if (git_repository_open_ext(&repo, repodir,
1224                 GIT_REPOSITORY_OPEN_NO_SEARCH, NULL) < 0) {
1225                 fprintf(stderr, "%s: cannot open repository\n", argv[0]);
1226                 return 1;
1227         }
1228
1229         /* find HEAD */
1230         if (!git_revparse_single(&obj, repo, "HEAD"))
1231                 head = git_object_id(obj);
1232         git_object_free(obj);
1233
1234         /* use directory name as name */
1235         if ((name = strrchr(repodirabs, '/')))
1236                 name++;
1237         else
1238                 name = "";
1239
1240         /* copy css */
1241         char cwd[PATH_MAX];
1242         strcpy(cwd, getcwd(cwd, sizeof(cwd)));
1243         cp("/usr/local/share/stagit/syntax.css", strcat(cwd, "/syntax.css"));
1244         strcpy(cwd, getcwd(cwd, sizeof(cwd)));
1245         cp("/usr/local/share/stagit/style.css", strcat(cwd, "/style.css"));
1246
1247         /* strip .git suffix */
1248         if (!(strippedname = strdup(name)))
1249                 err(1, "strdup");
1250         if ((p = strrchr(strippedname, '.')))
1251                 if (!strcmp(p, ".git"))
1252                         *p = '\0';
1253
1254         /* read description or .git/description */
1255         joinpath(path, sizeof(path), repodir, "description");
1256         if (!(fpread = fopen(path, "r"))) {
1257                 joinpath(path, sizeof(path), repodir, ".git/description");
1258                 fpread = fopen(path, "r");
1259         }
1260         if (fpread) {
1261                 if (!fgets(description, sizeof(description), fpread))
1262                         description[0] = '\0';
1263                 fclose(fpread);
1264         }
1265
1266         /* read url or .git/url */
1267         joinpath(path, sizeof(path), repodir, "url");
1268         if (!(fpread = fopen(path, "r"))) {
1269                 joinpath(path, sizeof(path), repodir, ".git/url");
1270                 fpread = fopen(path, "r");
1271         }
1272         if (fpread) {
1273                 if (!fgets(cloneurl, sizeof(cloneurl), fpread))
1274                         cloneurl[0] = '\0';
1275                 cloneurl[strcspn(cloneurl, "\n")] = '\0';
1276                 fclose(fpread);
1277         }
1278
1279         /* check LICENSE */
1280         for (i = 0; i < sizeof(licensefiles) / sizeof(*licensefiles) && !license; i++) {
1281                 if (!git_revparse_single(&obj, repo, licensefiles[i]) &&
1282                     git_object_type(obj) == GIT_OBJ_BLOB)
1283                         license = licensefiles[i] + strlen("HEAD:");
1284                 git_object_free(obj);
1285         }
1286
1287         /* check README */
1288         for (i = 0; i < sizeof(readmefiles) / sizeof(*readmefiles) && !readme; i++) {
1289                 if (!git_revparse_single(&obj, repo, readmefiles[i]) &&
1290                     git_object_type(obj) == GIT_OBJ_BLOB)
1291                         readme = readmefiles[i] + strlen("HEAD:");
1292                 git_object_free(obj);
1293         }
1294
1295         if (!git_revparse_single(&obj, repo, "HEAD:.gitmodules") &&
1296             git_object_type(obj) == GIT_OBJ_BLOB)
1297                 submodules = ".gitmodules";
1298         git_object_free(obj);
1299
1300         /* Generate tarball */
1301         char tarball[255];
1302         sprintf(tarball, "tar -zcf %s.tar.gz --ignore-failed-read --exclude='.git' %s",
1303                             strippedname, repodir);
1304         system(tarball);
1305
1306         /* log for HEAD */
1307         fp = efopen("log.html", "w");
1308         relpath = "";
1309         mkdir("commit", S_IRWXU | S_IRWXG | S_IRWXO);
1310         writeheader(fp, "Log");
1311         fputs("<table id=\"log\"><thead>\n<tr><td><b>Date</b></td>"
1312               "<td><b>Commit</b></td>"
1313               "<td><b>Author</b></td><td class=\"num\" align=\"right\"><b>Files</b></td>"
1314               "<td class=\"num\" align=\"right\"><b>+</b></td>"
1315               "<td class=\"num\" align=\"right\"><b>-</b></td></tr>\n</thead><tbody>\n", fp);
1316
1317         if (cachefile && head) {
1318                 /* read from cache file (does not need to exist) */
1319                 if ((rcachefp = fopen(cachefile, "r"))) {
1320                         if (!fgets(lastoidstr, sizeof(lastoidstr), rcachefp))
1321                                 errx(1, "%s: no object id", cachefile);
1322                         if (git_oid_fromstr(&lastoid, lastoidstr))
1323                                 errx(1, "%s: invalid object id", cachefile);
1324                 }
1325
1326                 /* write log to (temporary) cache */
1327                 if ((fd = mkstemp(tmppath)) == -1)
1328                         err(1, "mkstemp");
1329                 if (!(wcachefp = fdopen(fd, "w")))
1330                         err(1, "fdopen: '%s'", tmppath);
1331                 /* write last commit id (HEAD) */
1332                 git_oid_tostr(buf, sizeof(buf), head);
1333                 fprintf(wcachefp, "%s\n", buf);
1334
1335                 writelog(fp, head);
1336
1337                 if (rcachefp) {
1338                         /* append previous log to log.html and the new cache */
1339                         while (!feof(rcachefp)) {
1340                                 n = fread(buf, 1, sizeof(buf), rcachefp);
1341                                 if (ferror(rcachefp))
1342                                         err(1, "fread");
1343                                 if (fwrite(buf, 1, n, fp) != n ||
1344                                     fwrite(buf, 1, n, wcachefp) != n)
1345                                         err(1, "fwrite");
1346                         }
1347                         fclose(rcachefp);
1348                 }
1349                 fclose(wcachefp);
1350         } else {
1351                 if (head)
1352                         writelog(fp, head);
1353         }
1354
1355         fputs("</tbody></table>", fp);
1356         writefooter(fp);
1357         fclose(fp);
1358
1359         /* files for HEAD */
1360         fp = efopen("files.html", "w");
1361         writeheader(fp, "Files");
1362         if (head)
1363                 writefiles(fp, head);
1364         writefooter(fp);
1365         fclose(fp);
1366
1367         cp("files.html", "index.html");
1368
1369         /* summary page with branches and tags */
1370         fp = efopen("refs.html", "w");
1371         writeheader(fp, "Refs");
1372         writerefs(fp);
1373         writefooter(fp);
1374         fclose(fp);
1375
1376         /* Atom feed */
1377         fp = efopen("atom.xml", "w");
1378         writeatom(fp);
1379         fclose(fp);
1380
1381         /* rename new cache file on success */
1382         if (cachefile && head) {
1383                 if (rename(tmppath, cachefile))
1384                         err(1, "rename: '%s' to '%s'", tmppath, cachefile);
1385                 umask((mask = umask(0)));
1386                 if (chmod(cachefile,
1387                     (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH) & ~mask))
1388                         err(1, "chmod: '%s'", cachefile);
1389         }
1390
1391         /* cleanup */
1392         git_repository_free(repo);
1393         git_libgit2_shutdown();
1394         free(strippedname);
1395
1396         return 0;
1397 }