stagit.c

   1 #include <sys/stat.h>
   2
   3 #include <err.h>
   4 #include <errno.h>
   5 #include <inttypes.h>
   6 #include <libgen.h>
   7 #include <limits.h>
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <string.h>
  11 #include <unistd.h>
  12
  13 #include <git2.h>
  14
  15 #include "compat.h"
  16
  17 struct deltainfo {
  18         git_patch *patch;
  19
  20         size_t addcount;
  21         size_t delcount;
  22 };
  23
  24 struct commitinfo {
  25         const git_oid *id;
  26
  27         char oid[GIT_OID_HEXSZ + 1];
  28         char parentoid[GIT_OID_HEXSZ + 1];
  29
  30         const git_signature *author;
  31         const git_signature *committer;
  32         const char          *summary;
  33         const char          *msg;
  34
  35         git_diff   *diff;
  36         git_commit *commit;
  37         git_commit *parent;
  38         git_tree   *commit_tree;
  39         git_tree   *parent_tree;
  40
  41         size_t addcount;
  42         size_t delcount;
  43         size_t filecount;
  44
  45         struct deltainfo **deltas;
  46         size_t ndeltas;
  47 };
  48
  49 static git_repository *repo;
  50
  51 static const char *relpath = "";
  52 static const char *repodir;
  53
  54 static char *name = "";
  55 static char *strippedname = "";
  56 static char description[255];
  57 static char cloneurl[1024];
  58 static int haslicense, hasreadme, hassubmodules;
  59
  60 /* cache */
  61 static git_oid lastoid;
  62 static char lastoidstr[GIT_OID_HEXSZ + 2]; /* id + newline + nul byte */
  63 static FILE *rcachefp, *wcachefp;
  64 static const char *cachefile;
  65
  66 #ifndef USE_PLEDGE
  67 #define pledge(p1,p2) 0
  68 #endif
  69
  70 void
  71 joinpath(char *buf, size_t bufsiz, const char *path, const char *path2)
  72 {
  73         int r;
  74
  75         r = snprintf(buf, bufsiz, "%s%s%s",
  76                 path, path[0] && path[strlen(path) - 1] != '/' ? "/" : "", path2);
  77         if (r == -1 || (size_t)r >= bufsiz)
  78                 errx(1, "path truncated: '%s%s%s'",
  79                         path, path[0] && path[strlen(path) - 1] != '/' ? "/" : "", path2);
  80 }
  81
  82 void
  83 deltainfo_free(struct deltainfo *di)
  84 {
  85         if (!di)
  86                 return;
  87         git_patch_free(di->patch);
  88         di->patch = NULL;
  89         free(di);
  90 }
  91
  92 int
  93 commitinfo_getstats(struct commitinfo *ci)
  94 {
  95         struct deltainfo *di;
  96         const git_diff_delta *delta;
  97         const git_diff_hunk *hunk;
  98         const git_diff_line *line;
  99         git_patch *patch = NULL;
 100         size_t ndeltas, nhunks, nhunklines;
 101         size_t i, j, k;
 102
 103         ndeltas = git_diff_num_deltas(ci->diff);
 104         if (ndeltas && !(ci->deltas = calloc(ndeltas, sizeof(struct deltainfo *))))
 105                 err(1, "calloc");
 106
 107         for (i = 0; i < ndeltas; i++) {
 108                 if (git_patch_from_diff(&patch, ci->diff, i))
 109                         goto err;
 110                 if (!(di = calloc(1, sizeof(struct deltainfo))))
 111                         err(1, "calloc");
 112                 di->patch = patch;
 113                 ci->deltas[i] = di;
 114
 115                 delta = git_patch_get_delta(patch);
 116
 117                 /* skip stats for binary data */
 118                 if (delta->flags & GIT_DIFF_FLAG_BINARY)
 119                         continue;
 120
 121                 nhunks = git_patch_num_hunks(patch);
 122                 for (j = 0; j < nhunks; j++) {
 123                         if (git_patch_get_hunk(&hunk, &nhunklines, patch, j))
 124                                 break;
 125                         for (k = 0; ; k++) {
 126                                 if (git_patch_get_line_in_hunk(&line, patch, j, k))
 127                                         break;
 128                                 if (line->old_lineno == -1) {
 129                                         di->addcount++;
 130                                         ci->addcount++;
 131                                 } else if (line->new_lineno == -1) {
 132                                         di->delcount++;
 133                                         ci->delcount++;
 134                                 }
 135                         }
 136                 }
 137         }
 138         ci->ndeltas = i;
 139         ci->filecount = i;
 140
 141         return 0;
 142
 143 err:
 144         if (ci->deltas)
 145                 for (i = 0; i < ci->ndeltas; i++)
 146                         deltainfo_free(ci->deltas[i]);
 147         free(ci->deltas);
 148         ci->deltas = NULL;
 149         ci->ndeltas = 0;
 150         ci->addcount = 0;
 151         ci->delcount = 0;
 152         ci->filecount = 0;
 153
 154         return -1;
 155 }
 156
 157 void
 158 commitinfo_free(struct commitinfo *ci)
 159 {
 160         size_t i;
 161
 162         if (!ci)
 163                 return;
 164         if (ci->deltas)
 165                 for (i = 0; i < ci->ndeltas; i++)
 166                         deltainfo_free(ci->deltas[i]);
 167         free(ci->deltas);
 168         ci->deltas = NULL;
 169         git_diff_free(ci->diff);
 170         git_tree_free(ci->commit_tree);
 171         git_tree_free(ci->parent_tree);
 172         git_commit_free(ci->commit);
 173         git_commit_free(ci->parent);
 174         free(ci);
 175 }
 176
 177 struct commitinfo *
 178 commitinfo_getbyoid(const git_oid *id)
 179 {
 180         struct commitinfo *ci;
 181         git_diff_options opts;
 182
 183         if (!(ci = calloc(1, sizeof(struct commitinfo))))
 184                 err(1, "calloc");
 185
 186         if (git_commit_lookup(&(ci->commit), repo, id))
 187                 goto err;
 188         ci->id = id;
 189
 190         git_oid_tostr(ci->oid, sizeof(ci->oid), git_commit_id(ci->commit));
 191         git_oid_tostr(ci->parentoid, sizeof(ci->parentoid), git_commit_parent_id(ci->commit, 0));
 192
 193         ci->author = git_commit_author(ci->commit);
 194         ci->committer = git_commit_committer(ci->commit);
 195         ci->summary = git_commit_summary(ci->commit);
 196         ci->msg = git_commit_message(ci->commit);
 197
 198         if (git_tree_lookup(&(ci->commit_tree), repo, git_commit_tree_id(ci->commit)))
 199                 goto err;
 200         if (!git_commit_parent(&(ci->parent), ci->commit, 0)) {
 201                 if (git_tree_lookup(&(ci->parent_tree), repo, git_commit_tree_id(ci->parent))) {
 202                         ci->parent = NULL;
 203                         ci->parent_tree = NULL;
 204                 }
 205         }
 206
 207         git_diff_init_options(&opts, GIT_DIFF_OPTIONS_VERSION);
 208         opts.flags |= GIT_DIFF_DISABLE_PATHSPEC_MATCH;
 209         if (git_diff_tree_to_tree(&(ci->diff), repo, ci->parent_tree, ci->commit_tree, &opts))
 210                 goto err;
 211
 212         return ci;
 213
 214 err:
 215         commitinfo_free(ci);
 216
 217         return NULL;
 218 }
 219
 220 FILE *
 221 efopen(const char *name, const char *flags)
 222 {
 223         FILE *fp;
 224
 225         if (!(fp = fopen(name, flags)))
 226                 err(1, "fopen: '%s'", name);
 227
 228         return fp;
 229 }
 230
 231 /* Escape characters below as HTML 2.0 / XML 1.0. */
 232 void
 233 xmlencode(FILE *fp, const char *s, size_t len)
 234 {
 235         size_t i;
 236
 237         for (i = 0; *s && i < len; s++, i++) {
 238                 switch(*s) {
 239                 case '<':  fputs("&lt;",   fp); break;
 240                 case '>':  fputs("&gt;",   fp); break;
 241                 case '\'': fputs("&#39;",  fp); break;
 242                 case '&':  fputs("&amp;",  fp); break;
 243                 case '"':  fputs("&quot;", fp); break;
 244                 default:   fputc(*s, fp);
 245                 }
 246         }
 247 }
 248
 249 int
 250 mkdirp(const char *path)
 251 {
 252         char tmp[PATH_MAX], *p;
 253
 254         if (strlcpy(tmp, path, sizeof(tmp)) >= sizeof(tmp))
 255                 errx(1, "path truncated: '%s'", path);
 256         for (p = tmp + (tmp[0] == '/'); *p; p++) {
 257                 if (*p != '/')
 258                         continue;
 259                 *p = '\0';
 260                 if (mkdir(tmp, S_IRWXU | S_IRWXG | S_IRWXO) < 0 && errno != EEXIST)
 261                         return -1;
 262                 *p = '/';
 263         }
 264         if (mkdir(tmp, S_IRWXU | S_IRWXG | S_IRWXO) < 0 && errno != EEXIST)
 265                 return -1;
 266         return 0;
 267 }
 268
 269 void
 270 printtimez(FILE *fp, const git_time *intime)
 271 {
 272         struct tm *intm;
 273         time_t t;
 274         char out[32];
 275
 276         t = (time_t)intime->time;
 277         if (!(intm = gmtime(&t)))
 278                 return;
 279         strftime(out, sizeof(out), "%Y-%m-%dT%H:%M:%SZ", intm);
 280         fputs(out, fp);
 281 }
 282
 283 void
 284 printtime(FILE *fp, const git_time *intime)
 285 {
 286         struct tm *intm;
 287         time_t t;
 288         char out[32];
 289
 290         t = (time_t)intime->time + (intime->offset * 60);
 291         if (!(intm = gmtime(&t)))
 292                 return;
 293         strftime(out, sizeof(out), "%a, %e %b %Y %H:%M:%S", intm);
 294         if (intime->offset < 0)
 295                 fprintf(fp, "%s -%02d%02d", out,
 296                             -(intime->offset) / 60, -(intime->offset) % 60);
 297         else
 298                 fprintf(fp, "%s +%02d%02d", out,
 299                             intime->offset / 60, intime->offset % 60);
 300 }
 301
 302 void
 303 printtimeshort(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-%d %H:%M", intm);
 313         fputs(out, fp);
 314 }
 315
 316 void
 317 writeheader(FILE *fp, const char *title)
 318 {
 319         fputs("<!DOCTYPE html>\n"
 320                 "<html>\n<head>\n"
 321                 "<meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\" />\n"
 322                 "<title>", fp);
 323         xmlencode(fp, title, strlen(title));
 324         if (title[0] && strippedname[0])
 325                 fputs(" - ", fp);
 326         xmlencode(fp, strippedname, strlen(strippedname));
 327         if (description[0])
 328                 fputs(" - ", fp);
 329         xmlencode(fp, description, strlen(description));
 330         fprintf(fp, "</title>\n<link rel=\"icon\" type=\"image/png\" href=\"%sfavicon.png\" />\n", relpath);
 331         fprintf(fp, "<link rel=\"alternate\" type=\"application/atom+xml\" title=\"%s Atom Feed\" href=\"%satom.xml\" />\n",
 332                 name, relpath);
 333         fprintf(fp, "<link rel=\"stylesheet\" type=\"text/css\" href=\"%sstyle.css\" />\n", relpath);
 334         fputs("</head>\n<body>\n<table><tr><td>", fp);
 335         fprintf(fp, "<a href=\"../%s\"><img src=\"%slogo.png\" alt=\"\" width=\"32\" height=\"32\" /></a>",
 336                 relpath, relpath);
 337         fputs("</td><td><h1>", fp);
 338         xmlencode(fp, strippedname, strlen(strippedname));
 339         fputs("</h1><span class=\"desc\">", fp);
 340         xmlencode(fp, description, strlen(description));
 341         fputs("</span></td></tr>", fp);
 342         if (cloneurl[0]) {
 343                 fputs("<tr class=\"url\"><td></td><td>git clone <a href=\"", fp);
 344                 xmlencode(fp, cloneurl, strlen(cloneurl));
 345                 fputs("\">", fp);
 346                 xmlencode(fp, cloneurl, strlen(cloneurl));
 347                 fputs("</a></td></tr>", fp);
 348         }
 349         fputs("<tr><td></td><td>\n", fp);
 350         fprintf(fp, "<a href=\"%slog.html\">Log</a> | ", relpath);
 351         fprintf(fp, "<a href=\"%sfiles.html\">Files</a> | ", relpath);
 352         fprintf(fp, "<a href=\"%srefs.html\">Refs</a>", relpath);
 353         if (hassubmodules)
 354                 fprintf(fp, " | <a href=\"%sfile/.gitmodules.html\">Submodules</a>", relpath);
 355         if (hasreadme)
 356                 fprintf(fp, " | <a href=\"%sfile/README.html\">README</a>", relpath);
 357         if (haslicense)
 358                 fprintf(fp, " | <a href=\"%sfile/LICENSE.html\">LICENSE</a>", relpath);
 359         fputs("</td></tr></table>\n<hr/>\n<div id=\"content\">\n", fp);
 360 }
 361
 362 void
 363 writefooter(FILE *fp)
 364 {
 365         fputs("</div>\n</body>\n</html>\n", fp);
 366 }
 367
 368 int
 369 writeblobhtml(FILE *fp, const git_blob *blob)
 370 {
 371         size_t n = 0, i, prev;
 372         const char *nfmt = "<a href=\"#l%d\" class=\"line\" id=\"l%d\">%7d</a> ";
 373         const char *s = git_blob_rawcontent(blob);
 374         git_off_t len = git_blob_rawsize(blob);
 375
 376         fputs("<pre id=\"blob\">\n", fp);
 377
 378         if (len > 0) {
 379                 for (i = 0, prev = 0; i < (size_t)len; i++) {
 380                         if (s[i] != '\n')
 381                                 continue;
 382                         n++;
 383                         fprintf(fp, nfmt, n, n, n);
 384                         xmlencode(fp, &s[prev], i - prev + 1);
 385                         prev = i + 1;
 386                 }
 387                 /* trailing data */
 388                 if ((len - prev) > 0) {
 389                         n++;
 390                         fprintf(fp, nfmt, n, n, n);
 391                         xmlencode(fp, &s[prev], len - prev);
 392                 }
 393         }
 394
 395         fputs("</pre>\n", fp);
 396
 397         return n;
 398 }
 399
 400 void
 401 printcommit(FILE *fp, struct commitinfo *ci)
 402 {
 403         fprintf(fp, "<b>commit</b> <a href=\"%scommit/%s.html\">%s</a>\n",
 404                 relpath, ci->oid, ci->oid);
 405
 406         if (ci->parentoid[0])
 407                 fprintf(fp, "<b>parent</b> <a href=\"%scommit/%s.html\">%s</a>\n",
 408                         relpath, ci->parentoid, ci->parentoid);
 409
 410         if (ci->author) {
 411                 fputs("<b>Author:</b> ", fp);
 412                 xmlencode(fp, ci->author->name, strlen(ci->author->name));
 413                 fputs(" &lt;<a href=\"mailto:", fp);
 414                 xmlencode(fp, ci->author->email, strlen(ci->author->email));
 415                 fputs("\">", fp);
 416                 xmlencode(fp, ci->author->email, strlen(ci->author->email));
 417                 fputs("</a>&gt;\n<b>Date:</b>   ", fp);
 418                 printtime(fp, &(ci->author->when));
 419                 fputc('\n', fp);
 420         }
 421         if (ci->msg) {
 422                 fputc('\n', fp);
 423                 xmlencode(fp, ci->msg, strlen(ci->msg));
 424                 fputc('\n', fp);
 425         }
 426 }
 427
 428 void
 429 printshowfile(FILE *fp, struct commitinfo *ci)
 430 {
 431         const git_diff_delta *delta;
 432         const git_diff_hunk *hunk;
 433         const git_diff_line *line;
 434         git_patch *patch;
 435         size_t nhunks, nhunklines, changed, add, del, total, i, j, k;
 436         char linestr[80];
 437
 438         printcommit(fp, ci);
 439
 440         if (!ci->deltas)
 441                 return;
 442
 443         if (ci->filecount > 1000   ||
 444             ci->ndeltas   > 1000   ||
 445             ci->addcount  > 100000 ||
 446             ci->delcount  > 100000) {
 447                 fputs("Diff is too large, output suppressed.\n", fp);
 448                 return;
 449         }
 450
 451         /* diff stat */
 452         fputs("<b>Diffstat:</b>\n<table>", fp);
 453         for (i = 0; i < ci->ndeltas; i++) {
 454                 delta = git_patch_get_delta(ci->deltas[i]->patch);
 455                 fprintf(fp, "<tr><td><a href=\"#h%zu\">", i);
 456                 xmlencode(fp, delta->old_file.path, strlen(delta->old_file.path));
 457                 if (strcmp(delta->old_file.path, delta->new_file.path)) {
 458                         fputs(" -&gt; ", fp);
 459                         xmlencode(fp, delta->new_file.path, strlen(delta->new_file.path));
 460                 }
 461
 462                 add = ci->deltas[i]->addcount;
 463                 del = ci->deltas[i]->delcount;
 464                 changed = add + del;
 465                 total = sizeof(linestr) - 2;
 466                 if (changed > total) {
 467                         if (add)
 468                                 add = ((float)total / changed * add) + 1;
 469                         if (del)
 470                                 del = ((float)total / changed * del) + 1;
 471                 }
 472                 memset(&linestr, '+', add);
 473                 memset(&linestr[add], '-', del);
 474
 475                 fprintf(fp, "</a></td><td> | </td><td class=\"num\">%zu</td><td><span class=\"i\">",
 476                         ci->deltas[i]->addcount + ci->deltas[i]->delcount);
 477                 fwrite(&linestr, 1, add, fp);
 478                 fputs("</span><span class=\"d\">", fp);
 479                 fwrite(&linestr[add], 1, del, fp);
 480                 fputs("</span></td></tr>\n", fp);
 481         }
 482         fprintf(fp, "</table></pre><pre>%zu file%s changed, %zu insertion%s(+), %zu deletion%s(-)\n",
 483                 ci->filecount, ci->filecount == 1 ? "" : "s",
 484                 ci->addcount,  ci->addcount  == 1 ? "" : "s",
 485                 ci->delcount,  ci->delcount  == 1 ? "" : "s");
 486
 487         fputs("<hr/>", fp);
 488
 489         for (i = 0; i < ci->ndeltas; i++) {
 490                 patch = ci->deltas[i]->patch;
 491                 delta = git_patch_get_delta(patch);
 492                 fprintf(fp, "<b>diff --git a/<a id=\"h%zu\" href=\"%sfile/%s.html\">%s</a> b/<a href=\"%sfile/%s.html\">%s</a></b>\n",
 493                         i, relpath, delta->old_file.path, delta->old_file.path,
 494                         relpath, delta->new_file.path, delta->new_file.path);
 495
 496                 /* check binary data */
 497                 if (delta->flags & GIT_DIFF_FLAG_BINARY) {
 498                         fputs("Binary files differ.\n", fp);
 499                         continue;
 500                 }
 501
 502                 nhunks = git_patch_num_hunks(patch);
 503                 for (j = 0; j < nhunks; j++) {
 504                         if (git_patch_get_hunk(&hunk, &nhunklines, patch, j))
 505                                 break;
 506
 507                         fprintf(fp, "<a href=\"#h%zu-%zu\" id=\"h%zu-%zu\" class=\"h\">", i, j, i, j);
 508                         xmlencode(fp, hunk->header, hunk->header_len);
 509                         fputs("</a>", fp);
 510
 511                         for (k = 0; ; k++) {
 512                                 if (git_patch_get_line_in_hunk(&line, patch, j, k))
 513                                         break;
 514                                 if (line->old_lineno == -1)
 515                                         fprintf(fp, "<a href=\"#h%zu-%zu-%zu\" id=\"h%zu-%zu-%zu\" class=\"i\">+",
 516                                                 i, j, k, i, j, k);
 517                                 else if (line->new_lineno == -1)
 518                                         fprintf(fp, "<a href=\"#h%zu-%zu-%zu\" id=\"h%zu-%zu-%zu\" class=\"d\">-",
 519                                                 i, j, k, i, j, k);
 520                                 else
 521                                         fputc(' ', fp);
 522                                 xmlencode(fp, line->content, line->content_len);
 523                                 if (line->old_lineno == -1 || line->new_lineno == -1)
 524                                         fputs("</a>", fp);
 525                         }
 526                 }
 527         }
 528 }
 529
 530 void
 531 writelogline(FILE *fp, struct commitinfo *ci)
 532 {
 533         fputs("<tr><td>", fp);
 534         if (ci->author)
 535                 printtimeshort(fp, &(ci->author->when));
 536         fputs("</td><td>", fp);
 537         if (ci->summary) {
 538                 fprintf(fp, "<a href=\"%scommit/%s.html\">", relpath, ci->oid);
 539                 xmlencode(fp, ci->summary, strlen(ci->summary));
 540                 fputs("</a>", fp);
 541         }
 542         fputs("</td><td>", fp);
 543         if (ci->author)
 544                 xmlencode(fp, ci->author->name, strlen(ci->author->name));
 545         fputs("</td><td class=\"num\" align=\"right\">", fp);
 546         fprintf(fp, "%zu", ci->filecount);
 547         fputs("</td><td class=\"num\" align=\"right\">", fp);
 548         fprintf(fp, "+%zu", ci->addcount);
 549         fputs("</td><td class=\"num\" align=\"right\">", fp);
 550         fprintf(fp, "-%zu", ci->delcount);
 551         fputs("</td></tr>\n", fp);
 552 }
 553
 554 int
 555 writelog(FILE *fp, const git_oid *oid)
 556 {
 557         struct commitinfo *ci;
 558         git_revwalk *w = NULL;
 559         git_oid id;
 560         char path[PATH_MAX];
 561         FILE *fpfile;
 562         int r;
 563
 564         git_revwalk_new(&w, repo);
 565         git_revwalk_push(w, oid);
 566         git_revwalk_sorting(w, GIT_SORT_TIME);
 567         git_revwalk_simplify_first_parent(w);
 568
 569         while (!git_revwalk_next(&id, w)) {
 570                 relpath = "";
 571
 572                 if (cachefile && !memcmp(&id, &lastoid, sizeof(id)))
 573                         break;
 574                 if (!(ci = commitinfo_getbyoid(&id)))
 575                         break;
 576                 /* lookup stats: only required here */
 577                 if (commitinfo_getstats(ci) == -1)
 578                         goto err;
 579
 580                 writelogline(fp, ci);
 581                 if (cachefile)
 582                         writelogline(wcachefp, ci);
 583
 584                 relpath = "../";
 585
 586                 r = snprintf(path, sizeof(path), "commit/%s.html", ci->oid);
 587                 if (r == -1 || (size_t)r >= sizeof(path))
 588                         errx(1, "path truncated: 'commit/%s.html'", ci->oid);
 589
 590                 /* check if file exists if so skip it */
 591                 if (access(path, F_OK)) {
 592                         fpfile = efopen(path, "w");
 593                         writeheader(fpfile, ci->summary);
 594                         fputs("<pre>", fpfile);
 595                         printshowfile(fpfile, ci);
 596                         fputs("</pre>\n", fpfile);
 597                         writefooter(fpfile);
 598                         fclose(fpfile);
 599                 }
 600 err:
 601                 commitinfo_free(ci);
 602         }
 603         git_revwalk_free(w);
 604
 605         relpath = "";
 606
 607         return 0;
 608 }
 609
 610 void
 611 printcommitatom(FILE *fp, struct commitinfo *ci)
 612 {
 613         fputs("<entry>\n", fp);
 614
 615         fprintf(fp, "<id>%s</id>\n", ci->oid);
 616         if (ci->author) {
 617                 fputs("<published>", fp);
 618                 printtimez(fp, &(ci->author->when));
 619                 fputs("</published>\n", fp);
 620         }
 621         if (ci->committer) {
 622                 fputs("<updated>", fp);
 623                 printtimez(fp, &(ci->committer->when));
 624                 fputs("</updated>\n", fp);
 625         }
 626         if (ci->summary) {
 627                 fputs("<title type=\"text\">", fp);
 628                 xmlencode(fp, ci->summary, strlen(ci->summary));
 629                 fputs("</title>\n", fp);
 630         }
 631         fprintf(fp, "<link rel=\"alternate\" type=\"text/html\" href=\"commit/%s.html\" />",
 632                 ci->oid);
 633
 634         if (ci->author) {
 635                 fputs("<author><name>", fp);
 636                 xmlencode(fp, ci->author->name, strlen(ci->author->name));
 637                 fputs("</name>\n<email>", fp);
 638                 xmlencode(fp, ci->author->email, strlen(ci->author->email));
 639                 fputs("</email>\n</author>\n", fp);
 640         }
 641
 642         fputs("<content type=\"text\">", fp);
 643         fprintf(fp, "commit %s\n", ci->oid);
 644         if (ci->parentoid[0])
 645                 fprintf(fp, "parent %s\n", ci->parentoid);
 646         if (ci->author) {
 647                 fputs("Author: ", fp);
 648                 xmlencode(fp, ci->author->name, strlen(ci->author->name));
 649                 fputs(" &lt;", fp);
 650                 xmlencode(fp, ci->author->email, strlen(ci->author->email));
 651                 fputs("&gt;\nDate:   ", fp);
 652                 printtime(fp, &(ci->author->when));
 653                 fputc('\n', fp);
 654         }
 655         if (ci->msg) {
 656                 fputc('\n', fp);
 657                 xmlencode(fp, ci->msg, strlen(ci->msg));
 658         }
 659         fputs("\n</content>\n</entry>\n", fp);
 660 }
 661
 662 int
 663 writeatom(FILE *fp)
 664 {
 665         struct commitinfo *ci;
 666         git_revwalk *w = NULL;
 667         git_oid id;
 668         size_t i, m = 100; /* last 'm' commits */
 669
 670         fputs("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
 671               "<feed xmlns=\"http://www.w3.org/2005/Atom\">\n<title>", fp);
 672         xmlencode(fp, strippedname, strlen(strippedname));
 673         fputs(", branch HEAD</title>\n<subtitle>", fp);
 674         xmlencode(fp, description, strlen(description));
 675         fputs("</subtitle>\n", fp);
 676
 677         git_revwalk_new(&w, repo);
 678         git_revwalk_push_head(w);
 679         git_revwalk_sorting(w, GIT_SORT_TIME);
 680         git_revwalk_simplify_first_parent(w);
 681
 682         for (i = 0; i < m && !git_revwalk_next(&id, w); i++) {
 683                 if (!(ci = commitinfo_getbyoid(&id)))
 684                         break;
 685                 printcommitatom(fp, ci);
 686                 commitinfo_free(ci);
 687         }
 688         git_revwalk_free(w);
 689
 690         fputs("</feed>\n", fp);
 691
 692         return 0;
 693 }
 694
 695 int
 696 writeblob(git_object *obj, const char *fpath, const char *filename, git_off_t filesize)
 697 {
 698         char tmp[PATH_MAX] = "", *d;
 699         const char *p;
 700         int lc = 0;
 701         FILE *fp;
 702
 703         if (strlcpy(tmp, fpath, sizeof(tmp)) >= sizeof(tmp))
 704                 errx(1, "path truncated: '%s'", fpath);
 705         if (!(d = dirname(tmp)))
 706                 err(1, "dirname");
 707         if (mkdirp(d))
 708                 return -1;
 709
 710         for (p = fpath, tmp[0] = '\0'; *p; p++) {
 711                 if (*p == '/' && strlcat(tmp, "../", sizeof(tmp)) >= sizeof(tmp))
 712                         errx(1, "path truncated: '../%s'", tmp);
 713         }
 714         relpath = tmp;
 715
 716         fp = efopen(fpath, "w");
 717         writeheader(fp, filename);
 718         fputs("<p> ", fp);
 719         xmlencode(fp, filename, strlen(filename));
 720         fprintf(fp, " (%juB)", (uintmax_t)filesize);
 721         fputs("</p><hr/>", fp);
 722
 723         if (git_blob_is_binary((git_blob *)obj)) {
 724                 fputs("<p>Binary file.</p>\n", fp);
 725         } else {
 726                 lc = writeblobhtml(fp, (git_blob *)obj);
 727                 if (ferror(fp))
 728                         err(1, "fwrite");
 729         }
 730         writefooter(fp);
 731         fclose(fp);
 732
 733         relpath = "";
 734
 735         return lc;
 736 }
 737
 738 const char *
 739 filemode(git_filemode_t m)
 740 {
 741         static char mode[11];
 742
 743         memset(mode, '-', sizeof(mode) - 1);
 744         mode[10] = '\0';
 745
 746         if (S_ISREG(m))
 747                 mode[0] = '-';
 748         else if (S_ISBLK(m))
 749                 mode[0] = 'b';
 750         else if (S_ISCHR(m))
 751                 mode[0] = 'c';
 752         else if (S_ISDIR(m))
 753                 mode[0] = 'd';
 754         else if (S_ISFIFO(m))
 755                 mode[0] = 'p';
 756         else if (S_ISLNK(m))
 757                 mode[0] = 'l';
 758         else if (S_ISSOCK(m))
 759                 mode[0] = 's';
 760         else
 761                 mode[0] = '?';
 762
 763         if (m & S_IRUSR) mode[1] = 'r';
 764         if (m & S_IWUSR) mode[2] = 'w';
 765         if (m & S_IXUSR) mode[3] = 'x';
 766         if (m & S_IRGRP) mode[4] = 'r';
 767         if (m & S_IWGRP) mode[5] = 'w';
 768         if (m & S_IXGRP) mode[6] = 'x';
 769         if (m & S_IROTH) mode[7] = 'r';
 770         if (m & S_IWOTH) mode[8] = 'w';
 771         if (m & S_IXOTH) mode[9] = 'x';
 772
 773         if (m & S_ISUID) mode[3] = (mode[3] == 'x') ? 's' : 'S';
 774         if (m & S_ISGID) mode[6] = (mode[6] == 'x') ? 's' : 'S';
 775         if (m & S_ISVTX) mode[9] = (mode[9] == 'x') ? 't' : 'T';
 776
 777         return mode;
 778 }
 779
 780 int
 781 writefilestree(FILE *fp, git_tree *tree, const char *path)
 782 {
 783         const git_tree_entry *entry = NULL;
 784         git_submodule *module = NULL;
 785         git_object *obj = NULL;
 786         git_off_t filesize;
 787         const char *entryname;
 788         char filepath[PATH_MAX], entrypath[PATH_MAX];
 789         size_t count, i;
 790         int lc, r, ret;
 791
 792         count = git_tree_entrycount(tree);
 793         for (i = 0; i < count; i++) {
 794                 if (!(entry = git_tree_entry_byindex(tree, i)) ||
 795                     !(entryname = git_tree_entry_name(entry)))
 796                         return -1;
 797                 joinpath(entrypath, sizeof(entrypath), path, entryname);
 798
 799                 r = snprintf(filepath, sizeof(filepath), "file/%s.html",
 800                          entrypath);
 801                 if (r == -1 || (size_t)r >= sizeof(filepath))
 802                         errx(1, "path truncated: 'file/%s.html'", entrypath);
 803
 804                 if (!git_tree_entry_to_object(&obj, repo, entry)) {
 805                         switch (git_object_type(obj)) {
 806                         case GIT_OBJ_BLOB:
 807                                 break;
 808                         case GIT_OBJ_TREE:
 809                                 /* NOTE: recurses */
 810                                 ret = writefilestree(fp, (git_tree *)obj,
 811                                                      entrypath);
 812                                 git_object_free(obj);
 813                                 if (ret)
 814                                         return ret;
 815                                 continue;
 816                         default:
 817                                 git_object_free(obj);
 818                                 continue;
 819                         }
 820
 821                         filesize = git_blob_rawsize((git_blob *)obj);
 822                         lc = writeblob(obj, filepath, entryname, filesize);
 823
 824                         fputs("<tr><td>", fp);
 825                         fputs(filemode(git_tree_entry_filemode(entry)), fp);
 826                         fprintf(fp, "</td><td><a href=\"%s%s\">", relpath, filepath);
 827                         xmlencode(fp, entrypath, strlen(entrypath));
 828                         fputs("</a></td><td class=\"num\" align=\"right\">", fp);
 829                         if (lc > 0)
 830                                 fprintf(fp, "%dL", lc);
 831                         else
 832                                 fprintf(fp, "%juB", (uintmax_t)filesize);
 833                         fputs("</td></tr>\n", fp);
 834                         git_object_free(obj);
 835                 } else if (!git_submodule_lookup(&module, repo, entryname)) {
 836                         fprintf(fp, "<tr><td>m---------</td><td><a href=\"%sfile/.gitmodules.html\">",
 837                                 relpath);
 838                         xmlencode(fp, entrypath, strlen(entrypath));
 839                         git_submodule_free(module);
 840                         fputs("</a></td><td class=\"num\" align=\"right\"></td></tr>\n", fp);
 841                 }
 842         }
 843
 844         return 0;
 845 }
 846
 847 int
 848 writefiles(FILE *fp, const git_oid *id)
 849 {
 850         git_tree *tree = NULL;
 851         git_commit *commit = NULL;
 852         int ret = -1;
 853
 854         fputs("<table id=\"files\"><thead>\n<tr>"
 855               "<td><b>Mode</b></td><td><b>Name</b></td>"
 856               "<td class=\"num\" align=\"right\"><b>Size</b></td>"
 857               "</tr>\n</thead><tbody>\n", fp);
 858
 859         if (!git_commit_lookup(&commit, repo, id) &&
 860             !git_commit_tree(&tree, commit))
 861                 ret = writefilestree(fp, tree, "");
 862
 863         fputs("</tbody></table>", fp);
 864
 865         git_commit_free(commit);
 866         git_tree_free(tree);
 867
 868         return ret;
 869 }
 870
 871 int
 872 refs_cmp(const void *v1, const void *v2)
 873 {
 874         git_reference *r1 = (*(git_reference **)v1);
 875         git_reference *r2 = (*(git_reference **)v2);
 876         int r;
 877
 878         if ((r = git_reference_is_branch(r1) - git_reference_is_branch(r2)))
 879                 return r;
 880
 881         return strcmp(git_reference_shorthand(r1),
 882                       git_reference_shorthand(r2));
 883 }
 884
 885 int
 886 writerefs(FILE *fp)
 887 {
 888         struct commitinfo *ci;
 889         const git_oid *id = NULL;
 890         git_object *obj = NULL;
 891         git_reference *dref = NULL, *r, *ref = NULL;
 892         git_reference_iterator *it = NULL;
 893         git_reference **refs = NULL;
 894         size_t count, i, j, refcount;
 895         const char *titles[] = { "Branches", "Tags" };
 896         const char *ids[] = { "branches", "tags" };
 897         const char *name;
 898
 899         if (git_reference_iterator_new(&it, repo))
 900                 return -1;
 901
 902         for (refcount = 0; !git_reference_next(&ref, it); refcount++) {
 903                 if (!(refs = reallocarray(refs, refcount + 1, sizeof(git_reference *))))
 904                         err(1, "realloc");
 905                 refs[refcount] = ref;
 906         }
 907         git_reference_iterator_free(it);
 908
 909         /* sort by type then shorthand name */
 910         qsort(refs, refcount, sizeof(git_reference *), refs_cmp);
 911
 912         for (j = 0; j < 2; j++) {
 913                 for (i = 0, count = 0; i < refcount; i++) {
 914                         if (!(git_reference_is_branch(refs[i]) && j == 0) &&
 915                             !(git_reference_is_tag(refs[i]) && j == 1))
 916                                 continue;
 917
 918                         switch (git_reference_type(refs[i])) {
 919                         case GIT_REF_SYMBOLIC:
 920                                 if (git_reference_resolve(&dref, refs[i]))
 921                                         goto err;
 922                                 r = dref;
 923                                 break;
 924                         case GIT_REF_OID:
 925                                 r = refs[i];
 926                                 break;
 927                         default:
 928                                 continue;
 929                         }
 930                         if (!git_reference_target(r) ||
 931                             git_reference_peel(&obj, r, GIT_OBJ_ANY))
 932                                 goto err;
 933                         if (!(id = git_object_id(obj)))
 934                                 goto err;
 935                         if (!(ci = commitinfo_getbyoid(id)))
 936                                 break;
 937
 938                         /* print header if it has an entry (first). */
 939                         if (++count == 1) {
 940                                 fprintf(fp, "<h2>%s</h2><table id=\"%s\">"
 941                                         "<thead>\n<tr><td><b>Name</b></td>"
 942                                         "<td><b>Last commit date</b></td>"
 943                                         "<td><b>Author</b></td>\n</tr>\n"
 944                                         "</thead><tbody>\n",
 945                                          titles[j], ids[j]);
 946                         }
 947
 948                         relpath = "";
 949                         name = git_reference_shorthand(r);
 950
 951                         fputs("<tr><td>", fp);
 952                         xmlencode(fp, name, strlen(name));
 953                         fputs("</td><td>", fp);
 954                         if (ci->author)
 955                                 printtimeshort(fp, &(ci->author->when));
 956                         fputs("</td><td>", fp);
 957                         if (ci->author)
 958                                 xmlencode(fp, ci->author->name, strlen(ci->author->name));
 959                         fputs("</td></tr>\n", fp);
 960
 961                         relpath = "../";
 962
 963                         commitinfo_free(ci);
 964                         git_object_free(obj);
 965                         obj = NULL;
 966                         git_reference_free(dref);
 967                         dref = NULL;
 968                 }
 969                 /* table footer */
 970                 if (count)
 971                         fputs("</tbody></table><br/>", fp);
 972         }
 973
 974 err:
 975         git_object_free(obj);
 976         git_reference_free(dref);
 977
 978         for (i = 0; i < refcount; i++)
 979                 git_reference_free(refs[i]);
 980         free(refs);
 981
 982         return 0;
 983 }
 984
 985 void
 986 usage(char *argv0)
 987 {
 988         fprintf(stderr, "%s [-c cachefile] repodir\n", argv0);
 989         exit(1);
 990 }
 991
 992 int
 993 main(int argc, char *argv[])
 994 {
 995         git_object *obj = NULL;
 996         const git_oid *head = NULL;
 997         const git_error *e = NULL;
 998         FILE *fp, *fpread;
 999         char path[PATH_MAX], repodirabs[PATH_MAX + 1], *p;
1000         char tmppath[64] = "cache.XXXXXXXXXXXX", buf[BUFSIZ];
1001         size_t n;
1002         int i, fd;
1003
1004         if (pledge("stdio rpath wpath cpath", NULL) == -1)
1005                 err(1, "pledge");
1006
1007         for (i = 1; i < argc; i++) {
1008                 if (argv[i][0] != '-') {
1009                         if (repodir)
1010                                 usage(argv[0]);
1011                         repodir = argv[i];
1012                 } else if (argv[i][1] == 'c') {
1013                         if (i + 1 >= argc)
1014                                 usage(argv[0]);
1015                         cachefile = argv[++i];
1016                 }
1017         }
1018         if (!repodir)
1019                 usage(argv[0]);
1020
1021         if (!realpath(repodir, repodirabs))
1022                 err(1, "realpath");
1023
1024         git_libgit2_init();
1025
1026         if (git_repository_open_ext(&repo, repodir,
1027                 GIT_REPOSITORY_OPEN_NO_SEARCH, NULL) < 0) {
1028                 e = giterr_last();
1029                 fprintf(stderr, "%s: %s\n", argv[0], e->message);
1030                 return 1;
1031         }
1032
1033         /* find HEAD */
1034         if (!git_revparse_single(&obj, repo, "HEAD"))
1035                 head = git_object_id(obj);
1036         git_object_free(obj);
1037
1038         /* don't cache if there is no HEAD */
1039         if (!head)
1040                 cachefile = NULL;
1041
1042         /* use directory name as name */
1043         if ((name = strrchr(repodirabs, '/')))
1044                 name++;
1045         else
1046                 name = "";
1047
1048         /* strip .git suffix */
1049         if (!(strippedname = strdup(name)))
1050                 err(1, "strdup");
1051         if ((p = strrchr(strippedname, '.')))
1052                 if (!strcmp(p, ".git"))
1053                         *p = '\0';
1054
1055         /* read description or .git/description */
1056         joinpath(path, sizeof(path), repodir, "description");
1057         if (!(fpread = fopen(path, "r"))) {
1058                 joinpath(path, sizeof(path), repodir, ".git/description");
1059                 fpread = fopen(path, "r");
1060         }
1061         if (fpread) {
1062                 if (!fgets(description, sizeof(description), fpread))
1063                         description[0] = '\0';
1064                 fclose(fpread);
1065         }
1066
1067         /* read url or .git/url */
1068         joinpath(path, sizeof(path), repodir, "url");
1069         if (!(fpread = fopen(path, "r"))) {
1070                 joinpath(path, sizeof(path), repodir, ".git/url");
1071                 fpread = fopen(path, "r");
1072         }
1073         if (fpread) {
1074                 if (!fgets(cloneurl, sizeof(cloneurl), fpread))
1075                         cloneurl[0] = '\0';
1076                 cloneurl[strcspn(cloneurl, "\n")] = '\0';
1077                 fclose(fpread);
1078         }
1079
1080         /* check LICENSE */
1081         haslicense = (!git_revparse_single(&obj, repo, "HEAD:LICENSE") &&
1082                 git_object_type(obj) == GIT_OBJ_BLOB);
1083         git_object_free(obj);
1084
1085         /* check README */
1086         hasreadme = (!git_revparse_single(&obj, repo, "HEAD:README") &&
1087                 git_object_type(obj) == GIT_OBJ_BLOB);
1088         git_object_free(obj);
1089
1090         hassubmodules = (!git_revparse_single(&obj, repo, "HEAD:.gitmodules") &&
1091                 git_object_type(obj) == GIT_OBJ_BLOB);
1092         git_object_free(obj);
1093
1094         /* log for HEAD */
1095         fp = efopen("log.html", "w");
1096         relpath = "";
1097         mkdir("commit", S_IRWXU | S_IRWXG | S_IRWXO);
1098         writeheader(fp, "Log");
1099         fputs("<table id=\"log\"><thead>\n<tr><td><b>Date</b></td>"
1100               "<td><b>Commit message</b></td>"
1101               "<td><b>Author</b></td><td class=\"num\" align=\"right\"><b>Files</b></td>"
1102               "<td class=\"num\" align=\"right\"><b>+</b></td>"
1103               "<td class=\"num\" align=\"right\"><b>-</b></td></tr>\n</thead><tbody>\n", fp);
1104
1105         if (cachefile) {
1106                 /* read from cache file (does not need to exist) */
1107                 if ((rcachefp = fopen(cachefile, "r"))) {
1108                         if (!fgets(lastoidstr, sizeof(lastoidstr), rcachefp))
1109                                 errx(1, "%s: no object id", cachefile);
1110                         if (git_oid_fromstr(&lastoid, lastoidstr))
1111                                 errx(1, "%s: invalid object id", cachefile);
1112                 }
1113
1114                 /* write log to (temporary) cache */
1115                 if ((fd = mkstemp(tmppath)) == -1)
1116                         err(1, "mkstemp");
1117                 if (!(wcachefp = fdopen(fd, "w")))
1118                         err(1, "fdopen: '%s'", tmppath);
1119                 /* write last commit id (HEAD) */
1120                 git_oid_tostr(buf, sizeof(buf), head);
1121                 fprintf(wcachefp, "%s\n", buf);
1122
1123                 writelog(fp, head);
1124
1125                 if (rcachefp) {
1126                         /* append previous log to log.html and the new cache */
1127                         while (!feof(rcachefp)) {
1128                                 n = fread(buf, 1, sizeof(buf), rcachefp);
1129                                 if (ferror(rcachefp))
1130                                         err(1, "fread");
1131                                 if (fwrite(buf, 1, n, fp) != n ||
1132                                     fwrite(buf, 1, n, wcachefp) != n)
1133                                         err(1, "fwrite");
1134                         }
1135                         fclose(rcachefp);
1136                 }
1137                 fclose(wcachefp);
1138         } else {
1139                 if (head)
1140                         writelog(fp, head);
1141         }
1142
1143         fputs("</tbody></table>", fp);
1144         writefooter(fp);
1145         fclose(fp);
1146
1147         /* files for HEAD */
1148         fp = efopen("files.html", "w");
1149         writeheader(fp, "Files");
1150         if (head)
1151                 writefiles(fp, head);
1152         writefooter(fp);
1153         fclose(fp);
1154
1155         /* summary page with branches and tags */
1156         fp = efopen("refs.html", "w");
1157         writeheader(fp, "Refs");
1158         writerefs(fp);
1159         writefooter(fp);
1160         fclose(fp);
1161
1162         /* Atom feed */
1163         fp = efopen("atom.xml", "w");
1164         writeatom(fp);
1165         fclose(fp);
1166
1167         /* rename new cache file on success */
1168         if (cachefile && rename(tmppath, cachefile))
1169                 err(1, "rename: '%s' to '%s'", tmppath, cachefile);
1170
1171         /* cleanup */
1172         git_repository_free(repo);
1173         git_libgit2_shutdown();
1174
1175         return 0;
1176 }