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 #include "config.h"
  17
  18 struct deltainfo {
  19         git_patch *patch;
  20
  21         size_t addcount;
  22         size_t delcount;
  23 };
  24
  25 struct commitinfo {
  26         const git_oid *id;
  27
  28         char oid[GIT_OID_HEXSZ + 1];
  29         char parentoid[GIT_OID_HEXSZ + 1];
  30
  31         const git_signature *author;
  32         const git_signature *committer;
  33         const char          *summary;
  34         const char          *msg;
  35
  36         git_diff   *diff;
  37         git_commit *commit;
  38         git_commit *parent;
  39         git_tree   *commit_tree;
  40         git_tree   *parent_tree;
  41
  42         size_t addcount;
  43         size_t delcount;
  44         size_t filecount;
  45
  46         struct deltainfo **deltas;
  47         size_t ndeltas;
  48 };
  49
  50 static git_repository *repo;
  51
  52 static const char *relpath = "";
  53 static const char *repodir;
  54
  55 static char *name = "";
  56 static char *stripped_name;
  57 static char description[255];
  58 static char cloneurl[1024];
  59 static int haslicense, hasreadme, hassubmodules;
  60
  61 /* cache */
  62 static git_oid lastoid;
  63 static char lastoidstr[GIT_OID_HEXSZ + 2]; /* id + newline + nul byte */
  64 static FILE *rcachefp, *wcachefp;
  65 static const char *cachefile;
  66
  67 void
  68 deltainfo_free(struct deltainfo *di)
  69 {
  70         if (!di)
  71                 return;
  72         git_patch_free(di->patch);
  73         di->patch = NULL;
  74         free(di);
  75 }
  76
  77 int
  78 commitinfo_getstats(struct commitinfo *ci)
  79 {
  80         struct deltainfo *di;
  81         const git_diff_delta *delta;
  82         const git_diff_hunk *hunk;
  83         const git_diff_line *line;
  84         git_patch *patch = NULL;
  85         size_t ndeltas, nhunks, nhunklines;
  86         size_t i, j, k;
  87
  88         ndeltas = git_diff_num_deltas(ci->diff);
  89         if (ndeltas && !(ci->deltas = calloc(ndeltas, sizeof(struct deltainfo *))))
  90                 err(1, "calloc");
  91
  92         for (i = 0; i < ndeltas; i++) {
  93                 if (!(di = calloc(1, sizeof(struct deltainfo))))
  94                         err(1, "calloc");
  95                 if (git_patch_from_diff(&patch, ci->diff, i)) {
  96                         git_patch_free(patch);
  97                         goto err;
  98                 }
  99                 di->patch = patch;
 100                 ci->deltas[i] = di;
 101
 102                 delta = git_patch_get_delta(patch);
 103
 104                 /* check binary data */
 105                 if (delta->flags & GIT_DIFF_FLAG_BINARY)
 106                         continue;
 107
 108                 nhunks = git_patch_num_hunks(patch);
 109                 for (j = 0; j < nhunks; j++) {
 110                         if (git_patch_get_hunk(&hunk, &nhunklines, patch, j))
 111                                 break;
 112                         for (k = 0; ; k++) {
 113                                 if (git_patch_get_line_in_hunk(&line, patch, j, k))
 114                                         break;
 115                                 if (line->old_lineno == -1) {
 116                                         di->addcount++;
 117                                         ci->addcount++;
 118                                 } else if (line->new_lineno == -1) {
 119                                         di->delcount++;
 120                                         ci->delcount++;
 121                                 }
 122                         }
 123                 }
 124         }
 125         ci->ndeltas = i;
 126         ci->filecount = i;
 127
 128         return 0;
 129
 130 err:
 131         if (ci->deltas)
 132                 for (i = 0; i < ci->ndeltas; i++)
 133                         deltainfo_free(ci->deltas[i]);
 134         free(ci->deltas);
 135         ci->deltas = NULL;
 136         ci->ndeltas = 0;
 137         ci->addcount = 0;
 138         ci->delcount = 0;
 139         ci->filecount = 0;
 140
 141         return -1;
 142 }
 143
 144 void
 145 commitinfo_free(struct commitinfo *ci)
 146 {
 147         size_t i;
 148
 149         if (!ci)
 150                 return;
 151         if (ci->deltas)
 152                 for (i = 0; i < ci->ndeltas; i++)
 153                         deltainfo_free(ci->deltas[i]);
 154         free(ci->deltas);
 155         ci->deltas = NULL;
 156         git_diff_free(ci->diff);
 157         git_tree_free(ci->commit_tree);
 158         git_tree_free(ci->parent_tree);
 159         git_commit_free(ci->commit);
 160 }
 161
 162 struct commitinfo *
 163 commitinfo_getbyoid(const git_oid *id)
 164 {
 165         struct commitinfo *ci;
 166         git_diff_options opts;
 167
 168         if (!(ci = calloc(1, sizeof(struct commitinfo))))
 169                 err(1, "calloc");
 170
 171         if (git_commit_lookup(&(ci->commit), repo, id))
 172                 goto err;
 173         ci->id = id;
 174
 175         git_oid_tostr(ci->oid, sizeof(ci->oid), git_commit_id(ci->commit));
 176         git_oid_tostr(ci->parentoid, sizeof(ci->parentoid), git_commit_parent_id(ci->commit, 0));
 177
 178         ci->author = git_commit_author(ci->commit);
 179         ci->committer = git_commit_committer(ci->commit);
 180         ci->summary = git_commit_summary(ci->commit);
 181         ci->msg = git_commit_message(ci->commit);
 182
 183         if (git_tree_lookup(&(ci->commit_tree), repo, git_commit_tree_id(ci->commit)))
 184                 goto err;
 185         if (!git_commit_parent(&(ci->parent), ci->commit, 0)) {
 186                 if (git_tree_lookup(&(ci->parent_tree), repo, git_commit_tree_id(ci->parent))) {
 187                         ci->parent = NULL;
 188                         ci->parent_tree = NULL;
 189                 }
 190         }
 191
 192         git_diff_init_options(&opts, GIT_DIFF_OPTIONS_VERSION);
 193         opts.flags |= GIT_DIFF_DISABLE_PATHSPEC_MATCH;
 194         if (git_diff_tree_to_tree(&(ci->diff), repo, ci->parent_tree, ci->commit_tree, &opts))
 195                 goto err;
 196         if (commitinfo_getstats(ci) == -1)
 197                 goto err;
 198
 199         return ci;
 200
 201 err:
 202         commitinfo_free(ci);
 203         free(ci);
 204
 205         return NULL;
 206 }
 207
 208 FILE *
 209 efopen(const char *name, const char *flags)
 210 {
 211         FILE *fp;
 212
 213         if (!(fp = fopen(name, flags)))
 214                 err(1, "fopen");
 215
 216         return fp;
 217 }
 218
 219 /* Escape characters below as HTML 2.0 / XML 1.0. */
 220 void
 221 xmlencode(FILE *fp, const char *s, size_t len)
 222 {
 223         size_t i;
 224
 225         for (i = 0; *s && i < len; s++, i++) {
 226                 switch(*s) {
 227                 case '<':  fputs("&lt;",   fp); break;
 228                 case '>':  fputs("&gt;",   fp); break;
 229                 case '\'': fputs("&apos;", fp); break;
 230                 case '&':  fputs("&amp;",  fp); break;
 231                 case '"':  fputs("&quot;", fp); break;
 232                 default:   fputc(*s, fp);
 233                 }
 234         }
 235 }
 236
 237 /* Some implementations of dirname(3) return a pointer to a static
 238  * internal buffer (OpenBSD). Others modify the contents of `path` (POSIX).
 239  * This is a wrapper function that is compatible with both versions.
 240  * The program will error out if dirname(3) failed, this can only happen
 241  * with the OpenBSD version. */
 242 char *
 243 xdirname(const char *path)
 244 {
 245         char *p, *b;
 246
 247         if (!(p = strdup(path)))
 248                 err(1, "strdup");
 249         if (!(b = dirname(p)))
 250                 err(1, "dirname");
 251         if (!(b = strdup(b)))
 252                 err(1, "strdup");
 253         free(p);
 254
 255         return b;
 256 }
 257
 258 int
 259 mkdirp(const char *path)
 260 {
 261         char tmp[PATH_MAX], *p;
 262
 263         if (strlcpy(tmp, path, sizeof(tmp)) >= sizeof(tmp))
 264                 errx(1, "path truncated: '%s'", path);
 265         for (p = tmp + (tmp[0] == '/'); *p; p++) {
 266                 if (*p != '/')
 267                         continue;
 268                 *p = '\0';
 269                 if (mkdir(tmp, S_IRWXU | S_IRWXG | S_IRWXO) < 0 && errno != EEXIST)
 270                         return -1;
 271                 *p = '/';
 272         }
 273         if (mkdir(tmp, S_IRWXU | S_IRWXG | S_IRWXO) < 0 && errno != EEXIST)
 274                 return -1;
 275         return 0;
 276 }
 277
 278 void
 279 printtimez(FILE *fp, const git_time *intime)
 280 {
 281         struct tm *intm;
 282         time_t t;
 283         char out[32];
 284
 285         t = (time_t)intime->time;
 286         if (!(intm = gmtime(&t)))
 287                 return;
 288         strftime(out, sizeof(out), "%Y-%m-%dT%H:%M:%SZ", intm);
 289         fputs(out, fp);
 290 }
 291
 292 void
 293 printtime(FILE *fp, const git_time *intime)
 294 {
 295         struct tm *intm;
 296         time_t t;
 297         int offset, sign = '+';
 298         char out[32];
 299
 300         offset = intime->offset * 60;
 301         t = (time_t)intime->time + offset;
 302         if (!(intm = gmtime(&t)))
 303                 return;
 304         strftime(out, sizeof(out), "%a %b %e %H:%M:%S", intm);
 305         if (offset < 0) {
 306                 offset = -offset;
 307                 sign = '-';
 308         }
 309         fprintf(fp, "%s %c%02d%02d", out, sign, offset / 60, offset % 60);
 310 }
 311
 312 void
 313 printtimeshort(FILE *fp, const git_time *intime)
 314 {
 315         struct tm *intm;
 316         time_t t;
 317         char out[32];
 318
 319         t = (time_t)intime->time;
 320         if (!(intm = gmtime(&t)))
 321                 return;
 322         strftime(out, sizeof(out), "%Y-%m-%d %H:%M", intm);
 323         fputs(out, fp);
 324 }
 325
 326 int
 327 writeheader(FILE *fp, const char *title)
 328 {
 329         fputs("<!DOCTYPE html>\n"
 330                 "<html dir=\"ltr\" lang=\"en\">\n<head>\n"
 331                 "<meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\" />\n"
 332                 "<meta http-equiv=\"Content-Language\" content=\"en\" />\n<title>", fp);
 333         xmlencode(fp, title, strlen(title));
 334         if (title[0] && stripped_name[0])
 335                 fputs(" - ", fp);
 336         xmlencode(fp, stripped_name, strlen(stripped_name));
 337         if (description[0])
 338                 fputs(" - ", fp);
 339         xmlencode(fp, description, strlen(description));
 340         fprintf(fp, "</title>\n<link rel=\"icon\" type=\"image/png\" href=\"%sfavicon.png\" />\n", relpath);
 341         fprintf(fp, "<link rel=\"alternate\" type=\"application/atom+xml\" title=\"%s Atom Feed\" href=\"%satom.xml\" />\n",
 342                 name, relpath);
 343         fprintf(fp, "<link rel=\"stylesheet\" type=\"text/css\" href=\"%sstyle.css\" />\n", relpath);
 344         fputs("</head>\n<body>\n<table><tr><td>", fp);
 345         fprintf(fp, "<a href=\"../%s\"><img src=\"%slogo.png\" alt=\"\" width=\"32\" height=\"32\" /></a>",
 346                 relpath, relpath);
 347         fputs("</td><td><h1>", fp);
 348         xmlencode(fp, stripped_name, strlen(stripped_name));
 349         fputs("</h1><span class=\"desc\">", fp);
 350         xmlencode(fp, description, strlen(description));
 351         fputs("</span></td></tr>", fp);
 352         if (cloneurl[0]) {
 353                 fputs("<tr class=\"url\"><td></td><td>git clone <a href=\"", fp);
 354                 xmlencode(fp, cloneurl, strlen(cloneurl));
 355                 fputs("\">", fp);
 356                 xmlencode(fp, cloneurl, strlen(cloneurl));
 357                 fputs("</a></td></tr>", fp);
 358         }
 359         fputs("<tr><td></td><td>\n", fp);
 360         fprintf(fp, "<a href=\"%slog.html\">Log</a> | ", relpath);
 361         fprintf(fp, "<a href=\"%sfiles.html\">Files</a> | ", relpath);
 362         fprintf(fp, "<a href=\"%srefs.html\">Refs</a>", relpath);
 363         if (hassubmodules)
 364                 fprintf(fp, " | <a href=\"%sfile/.gitmodules.html\">Submodules</a>", relpath);
 365         if (hasreadme)
 366                 fprintf(fp, " | <a href=\"%sfile/README.html\">README</a>", relpath);
 367         if (haslicense)
 368                 fprintf(fp, " | <a href=\"%sfile/LICENSE.html\">LICENSE</a>", relpath);
 369         fputs("</td></tr></table>\n<hr/>\n<div id=\"content\">\n", fp);
 370
 371         return 0;
 372 }
 373
 374 int
 375 writefooter(FILE *fp)
 376 {
 377         return !fputs("</div>\n</body>\n</html>\n", fp);
 378 }
 379
 380 int
 381 writeblobhtml(FILE *fp, const git_blob *blob)
 382 {
 383         off_t i;
 384         size_t n = 0;
 385         char *nfmt = "<a href=\"#l%d\" id=\"l%d\">%d</a>\n";
 386         const char *s = git_blob_rawcontent(blob);
 387         git_off_t len = git_blob_rawsize(blob);
 388
 389         fputs("<table id=\"blob\"><tr><td class=\"num\"><pre>\n", fp);
 390
 391         if (len) {
 392                 n++;
 393                 fprintf(fp, nfmt, n, n, n);
 394                 for (i = 0; i < len - 1; i++) {
 395                         if (s[i] == '\n') {
 396                                 n++;
 397                                 fprintf(fp, nfmt, n, n, n);
 398                         }
 399                 }
 400         }
 401
 402         fputs("</pre></td><td><pre>\n", fp);
 403         xmlencode(fp, s, (size_t)len);
 404         fputs("</pre></td></tr></table>\n", fp);
 405
 406         return n;
 407 }
 408
 409 void
 410 printcommit(FILE *fp, struct commitinfo *ci)
 411 {
 412         fprintf(fp, "<b>commit</b> <a href=\"%scommit/%s.html\">%s</a>\n",
 413                 relpath, ci->oid, ci->oid);
 414
 415         if (ci->parentoid[0])
 416                 fprintf(fp, "<b>parent</b> <a href=\"%scommit/%s.html\">%s</a>\n",
 417                         relpath, ci->parentoid, ci->parentoid);
 418
 419         if (ci->author) {
 420                 fputs("<b>Author:</b> ", fp);
 421                 xmlencode(fp, ci->author->name, strlen(ci->author->name));
 422                 fputs(" &lt;<a href=\"mailto:", fp);
 423                 xmlencode(fp, ci->author->email, strlen(ci->author->email));
 424                 fputs("\">", fp);
 425                 xmlencode(fp, ci->author->email, strlen(ci->author->email));
 426                 fputs("</a>&gt;\n<b>Date:</b>   ", fp);
 427                 printtime(fp, &(ci->author->when));
 428                 fputc('\n', fp);
 429         }
 430         if (ci->msg) {
 431                 fputc('\n', fp);
 432                 xmlencode(fp, ci->msg, strlen(ci->msg));
 433                 fputc('\n', fp);
 434         }
 435 }
 436
 437 void
 438 printshowfile(FILE *fp, struct commitinfo *ci)
 439 {
 440         const git_diff_delta *delta;
 441         const git_diff_hunk *hunk;
 442         const git_diff_line *line;
 443         git_patch *patch;
 444         size_t nhunks, nhunklines, changed, add, del, total, i, j, k;
 445         char linestr[80];
 446
 447         printcommit(fp, ci);
 448
 449         if (!ci->deltas)
 450                 return;
 451
 452         if (ci->filecount > 1000   ||
 453             ci->ndeltas   > 1000   ||
 454             ci->addcount  > 100000 ||
 455             ci->delcount  > 100000) {
 456                 fprintf(fp, "(diff is too large, output suppressed)");
 457                 return;
 458         }
 459
 460         /* diff stat */
 461         fputs("<b>Diffstat:</b>\n<table>", fp);
 462         for (i = 0; i < ci->ndeltas; i++) {
 463                 delta = git_patch_get_delta(ci->deltas[i]->patch);
 464                 fputs("<tr><td>", fp);
 465                 xmlencode(fp, delta->old_file.path, strlen(delta->old_file.path));
 466                 if (strcmp(delta->old_file.path, delta->new_file.path)) {
 467                         fputs(" -&gt; ", fp);
 468                         xmlencode(fp, delta->new_file.path, strlen(delta->new_file.path));
 469                 }
 470
 471                 add = ci->deltas[i]->addcount;
 472                 del = ci->deltas[i]->delcount;
 473                 changed = add + del;
 474                 total = sizeof(linestr) - 2;
 475                 if (changed > total) {
 476                         if (add)
 477                                 add = ((float)total / changed * add) + 1;
 478                         if (del)
 479                                 del = ((float)total / changed * del) + 1;
 480                 }
 481                 memset(&linestr, '+', add);
 482                 memset(&linestr[add], '-', del);
 483
 484                 fprintf(fp, "</td><td> | </td><td class=\"num\">%zu</td><td><span class=\"i\">",
 485                         ci->deltas[i]->addcount + ci->deltas[i]->delcount);
 486                 fwrite(&linestr, 1, add, fp);
 487                 fputs("</span><span class=\"d\">", fp);
 488                 fwrite(&linestr[add], 1, del, fp);
 489                 fputs("</span></td></tr>\n", fp);
 490         }
 491         fprintf(fp, "</table>%zu file%s changed, %zu insertion%s(+), %zu deletion%s(-)\n",
 492                 ci->filecount, ci->filecount == 1 ? "" : "s",
 493                 ci->addcount,  ci->addcount  == 1 ? "" : "s",
 494                 ci->delcount,  ci->delcount  == 1 ? "" : "s");
 495
 496         fputs("<hr/>", fp);
 497
 498         for (i = 0; i < ci->ndeltas; i++) {
 499                 patch = ci->deltas[i]->patch;
 500                 delta = git_patch_get_delta(patch);
 501                 fprintf(fp, "<b>diff --git a/<a href=\"%sfile/%s.html\">%s</a> b/<a href=\"%sfile/%s.html\">%s</a></b>\n",
 502                         relpath, delta->old_file.path, delta->old_file.path,
 503                         relpath, delta->new_file.path, delta->new_file.path);
 504
 505                 /* check binary data */
 506                 if (delta->flags & GIT_DIFF_FLAG_BINARY) {
 507                         fputs("Binary files differ\n", fp);
 508                         continue;
 509                 }
 510
 511                 nhunks = git_patch_num_hunks(patch);
 512                 for (j = 0; j < nhunks; j++) {
 513                         if (git_patch_get_hunk(&hunk, &nhunklines, patch, j))
 514                                 break;
 515
 516                         fprintf(fp, "<a href=\"#h%zu-%zu\" id=\"h%zu-%zu\" class=\"h\">", i, j, i, j);
 517                         xmlencode(fp, hunk->header, hunk->header_len);
 518                         fputs("</a>", fp);
 519
 520                         for (k = 0; ; k++) {
 521                                 if (git_patch_get_line_in_hunk(&line, patch, j, k))
 522                                         break;
 523                                 if (line->old_lineno == -1)
 524                                         fprintf(fp, "<a href=\"#h%zu-%zu-%zu\" id=\"h%zu-%zu-%zu\" class=\"i\">+",
 525                                                 i, j, k, i, j, k);
 526                                 else if (line->new_lineno == -1)
 527                                         fprintf(fp, "<a href=\"#h%zu-%zu-%zu\" id=\"h%zu-%zu-%zu\" class=\"d\">-",
 528                                                 i, j, k, i, j, k);
 529                                 else
 530                                         fputc(' ', fp);
 531                                 xmlencode(fp, line->content, line->content_len);
 532                                 if (line->old_lineno == -1 || line->new_lineno == -1)
 533                                         fputs("</a>", fp);
 534                         }
 535                 }
 536         }
 537 }
 538
 539 void
 540 writelogline(FILE *fp, struct commitinfo *ci)
 541 {
 542         size_t len;
 543
 544         fputs("<tr><td>", fp);
 545         if (ci->author)
 546                 printtimeshort(fp, &(ci->author->when));
 547         fputs("</td><td>", fp);
 548         if (ci->summary) {
 549                 fprintf(fp, "<a href=\"%scommit/%s.html\">", relpath, ci->oid);
 550                 if ((len = strlen(ci->summary)) > summarylen) {
 551                         xmlencode(fp, ci->summary, summarylen - 1);
 552                         fputs("…", fp);
 553                 } else {
 554                         xmlencode(fp, ci->summary, len);
 555                 }
 556                 fputs("</a>", fp);
 557         }
 558         fputs("</td><td>", fp);
 559         if (ci->author)
 560                 xmlencode(fp, ci->author->name, strlen(ci->author->name));
 561         fputs("</td><td class=\"num\">", fp);
 562         fprintf(fp, "%zu", ci->filecount);
 563         fputs("</td><td class=\"num\">", fp);
 564         fprintf(fp, "+%zu", ci->addcount);
 565         fputs("</td><td class=\"num\">", fp);
 566         fprintf(fp, "-%zu", ci->delcount);
 567         fputs("</td></tr>\n", fp);
 568 }
 569
 570 int
 571 writelog(FILE *fp, const git_oid *oid)
 572 {
 573         struct commitinfo *ci;
 574         git_revwalk *w = NULL;
 575         git_oid id;
 576         char path[PATH_MAX];
 577         FILE *fpfile;
 578         int r;
 579
 580         git_revwalk_new(&w, repo);
 581         git_revwalk_push(w, oid);
 582         git_revwalk_sorting(w, GIT_SORT_TIME);
 583         git_revwalk_simplify_first_parent(w);
 584
 585         while (!git_revwalk_next(&id, w)) {
 586                 relpath = "";
 587
 588                 if (cachefile && !memcmp(&id, &lastoid, sizeof(id)))
 589                         break;
 590                 if (!(ci = commitinfo_getbyoid(&id)))
 591                         break;
 592
 593                 writelogline(fp, ci);
 594                 if (cachefile)
 595                         writelogline(wcachefp, ci);
 596
 597                 relpath = "../";
 598
 599                 r = snprintf(path, sizeof(path), "commit/%s.html", ci->oid);
 600                 if (r == -1 || (size_t)r >= sizeof(path))
 601                         errx(1, "path truncated: 'commit/%s.html'", ci->oid);
 602
 603                 /* check if file exists if so skip it */
 604                 if (access(path, F_OK)) {
 605                         fpfile = efopen(path, "w");
 606                         writeheader(fpfile, ci->summary);
 607                         fputs("<pre>", fpfile);
 608                         printshowfile(fpfile, ci);
 609                         fputs("</pre>\n", fpfile);
 610                         writefooter(fpfile);
 611                         fclose(fpfile);
 612                 }
 613                 commitinfo_free(ci);
 614         }
 615         git_revwalk_free(w);
 616
 617         relpath = "";
 618
 619         return 0;
 620 }
 621
 622 void
 623 printcommitatom(FILE *fp, struct commitinfo *ci)
 624 {
 625         fputs("<entry>\n", fp);
 626
 627         fprintf(fp, "<id>%s</id>\n", ci->oid);
 628         if (ci->author) {
 629                 fputs("<published>", fp);
 630                 printtimez(fp, &(ci->author->when));
 631                 fputs("</published>\n", fp);
 632         }
 633         if (ci->committer) {
 634                 fputs("<updated>", fp);
 635                 printtimez(fp, &(ci->committer->when));
 636                 fputs("</updated>\n", fp);
 637         }
 638         if (ci->summary) {
 639                 fputs("<title type=\"text\">", fp);
 640                 xmlencode(fp, ci->summary, strlen(ci->summary));
 641                 fputs("</title>\n", fp);
 642         }
 643         fprintf(fp, "<link rel=\"alternate\" type=\"text/html\" href=\"commit/%s.html\" />",
 644                 ci->oid);
 645
 646         if (ci->author) {
 647                 fputs("<author><name>", fp);
 648                 xmlencode(fp, ci->author->name, strlen(ci->author->name));
 649                 fputs("</name>\n<email>", fp);
 650                 xmlencode(fp, ci->author->email, strlen(ci->author->email));
 651                 fputs("</email>\n</author>\n", fp);
 652         }
 653
 654         fputs("<content type=\"text\">", fp);
 655         fprintf(fp, "commit %s\n", ci->oid);
 656         if (ci->parentoid[0])
 657                 fprintf(fp, "parent %s\n", ci->parentoid);
 658         if (ci->author) {
 659                 fputs("Author: ", fp);
 660                 xmlencode(fp, ci->author->name, strlen(ci->author->name));
 661                 fputs(" &lt;", fp);
 662                 xmlencode(fp, ci->author->email, strlen(ci->author->email));
 663                 fputs("&gt;\nDate:   ", fp);
 664                 printtime(fp, &(ci->author->when));
 665                 fputc('\n', fp);
 666         }
 667         if (ci->msg) {
 668                 fputc('\n', fp);
 669                 xmlencode(fp, ci->msg, strlen(ci->msg));
 670         }
 671         fputs("\n</content>\n", fp);
 672
 673         fputs("</entry>\n", fp);
 674 }
 675
 676 int
 677 writeatom(FILE *fp)
 678 {
 679         struct commitinfo *ci;
 680         git_revwalk *w = NULL;
 681         git_oid id;
 682         size_t i, m = 100; /* last 'm' commits */
 683
 684         fputs("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
 685               "<feed xmlns=\"http://www.w3.org/2005/Atom\">\n<title>", fp);
 686         xmlencode(fp, stripped_name, strlen(stripped_name));
 687         fputs(", branch HEAD</title>\n<subtitle>", fp);
 688         xmlencode(fp, description, strlen(description));
 689         fputs("</subtitle>\n", fp);
 690
 691         git_revwalk_new(&w, repo);
 692         git_revwalk_push_head(w);
 693         git_revwalk_sorting(w, GIT_SORT_TIME);
 694         git_revwalk_simplify_first_parent(w);
 695
 696         for (i = 0; i < m && !git_revwalk_next(&id, w); i++) {
 697                 if (!(ci = commitinfo_getbyoid(&id)))
 698                         break;
 699                 printcommitatom(fp, ci);
 700                 commitinfo_free(ci);
 701         }
 702         git_revwalk_free(w);
 703
 704         fputs("</feed>", fp);
 705
 706         return 0;
 707 }
 708
 709 int
 710 writeblob(git_object *obj, const char *fpath, const char *filename, git_off_t filesize)
 711 {
 712         char tmp[PATH_MAX] = "", *d;
 713         const char *p;
 714         int lc = 0;
 715         FILE *fp;
 716
 717         d = xdirname(fpath);
 718         if (mkdirp(d)) {
 719                 free(d);
 720                 return -1;
 721         }
 722         free(d);
 723
 724         p = fpath;
 725         while (*p) {
 726                 if (*p == '/' && strlcat(tmp, "../", sizeof(tmp)) >= sizeof(tmp))
 727                         errx(1, "path truncated: '../%s'", tmp);
 728                 p++;
 729         }
 730         relpath = tmp;
 731
 732         fp = efopen(fpath, "w");
 733         writeheader(fp, filename);
 734         fputs("<p> ", fp);
 735         xmlencode(fp, filename, strlen(filename));
 736         fprintf(fp, " (%juB)", (uintmax_t)filesize);
 737         fputs("</p><hr/>", fp);
 738
 739         if (git_blob_is_binary((git_blob *)obj)) {
 740                 fputs("<p>Binary file</p>\n", fp);
 741         } else {
 742                 lc = writeblobhtml(fp, (git_blob *)obj);
 743                 if (ferror(fp))
 744                         err(1, "fwrite");
 745         }
 746         writefooter(fp);
 747         fclose(fp);
 748
 749         relpath = "";
 750
 751         return lc;
 752 }
 753
 754 const char *
 755 filemode(git_filemode_t m)
 756 {
 757         static char mode[11];
 758
 759         memset(mode, '-', sizeof(mode) - 1);
 760         mode[10] = '\0';
 761
 762         if (S_ISREG(m))
 763                 mode[0] = '-';
 764         else if (S_ISBLK(m))
 765                 mode[0] = 'b';
 766         else if (S_ISCHR(m))
 767                 mode[0] = 'c';
 768         else if (S_ISDIR(m))
 769                 mode[0] = 'd';
 770         else if (S_ISFIFO(m))
 771                 mode[0] = 'p';
 772         else if (S_ISLNK(m))
 773                 mode[0] = 'l';
 774         else if (S_ISSOCK(m))
 775                 mode[0] = 's';
 776         else
 777                 mode[0] = '?';
 778
 779         if (m & S_IRUSR) mode[1] = 'r';
 780         if (m & S_IWUSR) mode[2] = 'w';
 781         if (m & S_IXUSR) mode[3] = 'x';
 782         if (m & S_IRGRP) mode[4] = 'r';
 783         if (m & S_IWGRP) mode[5] = 'w';
 784         if (m & S_IXGRP) mode[6] = 'x';
 785         if (m & S_IROTH) mode[7] = 'r';
 786         if (m & S_IWOTH) mode[8] = 'w';
 787         if (m & S_IXOTH) mode[9] = 'x';
 788
 789         if (m & S_ISUID) mode[3] = (mode[3] == 'x') ? 's' : 'S';
 790         if (m & S_ISGID) mode[6] = (mode[6] == 'x') ? 's' : 'S';
 791         if (m & S_ISVTX) mode[9] = (mode[9] == 'x') ? 't' : 'T';
 792
 793         return mode;
 794 }
 795
 796 int
 797 writefilestree(FILE *fp, git_tree *tree, const char *branch, const char *path)
 798 {
 799         const git_tree_entry *entry = NULL;
 800         git_submodule *module = NULL;
 801         git_object *obj = NULL;
 802         git_off_t filesize;
 803         const char *entryname;
 804         char filepath[PATH_MAX], entrypath[PATH_MAX];
 805         size_t count, i;
 806         int lc, r, ret;
 807
 808         count = git_tree_entrycount(tree);
 809         for (i = 0; i < count; i++) {
 810                 if (!(entry = git_tree_entry_byindex(tree, i)) ||
 811                     !(entryname = git_tree_entry_name(entry)))
 812                         return -1;
 813                 r = snprintf(entrypath, sizeof(entrypath), "%s%s%s",
 814                          path, path[0] ? "/" : "", entryname);
 815                 if (r == -1 || (size_t)r >= sizeof(entrypath))
 816                         errx(1, "path truncated: '%s%s%s'",
 817                                 path, path[0] ? "/" : "", entryname);
 818
 819                 r = snprintf(filepath, sizeof(filepath), "file/%s%s%s.html",
 820                          path, path[0] ? "/" : "", entryname);
 821                 if (r == -1 || (size_t)r >= sizeof(filepath))
 822                         errx(1, "path truncated: 'file/%s%s%s.html'",
 823                                 path, path[0] ? "/" : "", entryname);
 824
 825                 if (!git_tree_entry_to_object(&obj, repo, entry)) {
 826                         switch (git_object_type(obj)) {
 827                         case GIT_OBJ_BLOB:
 828                                 break;
 829                         case GIT_OBJ_TREE:
 830                                 /* NOTE: recurses */
 831                                 ret = writefilestree(fp, (git_tree *)obj, branch,
 832                                                      entrypath);
 833                                 git_object_free(obj);
 834                                 if (ret)
 835                                         return ret;
 836                                 continue;
 837                         default:
 838                                 git_object_free(obj);
 839                                 continue;
 840                         }
 841
 842                         filesize = git_blob_rawsize((git_blob *)obj);
 843                         lc = writeblob(obj, filepath, entryname, filesize);
 844
 845                         fputs("<tr><td>", fp);
 846                         fputs(filemode(git_tree_entry_filemode(entry)), fp);
 847                         fprintf(fp, "</td><td><a href=\"%s%s\">", relpath, filepath);
 848                         xmlencode(fp, entrypath, strlen(entrypath));
 849                         fputs("</a></td><td class=\"num\">", fp);
 850                         if (showlinecount && lc > 0)
 851                                 fprintf(fp, "%dL", lc);
 852                         else
 853                                 fprintf(fp, "%juB", (uintmax_t)filesize);
 854                         fputs("</td></tr>\n", fp);
 855                 } else if (!git_submodule_lookup(&module, repo, entryname)) {
 856                         fprintf(fp, "<tr><td>m---------</td><td><a href=\"%sfile/.gitmodules.html\">",
 857                                 relpath);
 858                         xmlencode(fp, entrypath, strlen(entrypath));
 859                         git_submodule_free(module);
 860                         fputs("</a></td><td class=\"num\"></td></tr>\n", fp);
 861                 }
 862         }
 863
 864         return 0;
 865 }
 866
 867 int
 868 writefiles(FILE *fp, const git_oid *id, const char *branch)
 869 {
 870         git_tree *tree = NULL;
 871         git_commit *commit = NULL;
 872         int ret = -1;
 873
 874         fputs("<table id=\"files\"><thead>\n<tr>"
 875               "<td>Mode</td><td>Name</td><td class=\"num\">Size</td>"
 876               "</tr>\n</thead><tbody>\n", fp);
 877
 878         if (git_commit_lookup(&commit, repo, id) ||
 879             git_commit_tree(&tree, commit))
 880                 goto err;
 881         ret = writefilestree(fp, tree, branch, "");
 882
 883 err:
 884         fputs("</tbody></table>", fp);
 885
 886         git_commit_free(commit);
 887         git_tree_free(tree);
 888
 889         return ret;
 890 }
 891
 892 int
 893 refs_cmp(const void *v1, const void *v2)
 894 {
 895         git_reference *r1 = (*(git_reference **)v1);
 896         git_reference *r2 = (*(git_reference **)v2);
 897         int t1, t2;
 898
 899         t1 = git_reference_is_branch(r1);
 900         t2 = git_reference_is_branch(r2);
 901
 902         if (t1 != t2)
 903                 return t1 - t2;
 904
 905         return strcmp(git_reference_shorthand(r1),
 906                       git_reference_shorthand(r2));
 907 }
 908
 909 int
 910 writerefs(FILE *fp)
 911 {
 912         struct commitinfo *ci;
 913         const git_oid *id = NULL;
 914         git_object *obj = NULL;
 915         git_reference *dref = NULL, *r, *ref = NULL;
 916         git_reference_iterator *it = NULL;
 917         git_reference **refs = NULL;
 918         size_t count, i, j, refcount;
 919         const char *titles[] = { "Branches", "Tags" };
 920         const char *ids[] = { "branches", "tags" };
 921         const char *name;
 922
 923         if (git_reference_iterator_new(&it, repo))
 924                 return -1;
 925
 926         for (refcount = 0; !git_reference_next(&ref, it); refcount++) {
 927                 if (!(refs = reallocarray(refs, refcount + 1, sizeof(git_reference *))))
 928                         err(1, "realloc");
 929                 refs[refcount] = ref;
 930         }
 931         git_reference_iterator_free(it);
 932
 933         /* sort by type then shorthand name */
 934         qsort(refs, refcount, sizeof(git_reference *), refs_cmp);
 935
 936         for (j = 0; j < 2; j++) {
 937                 for (i = 0, count = 0; i < refcount; i++) {
 938                         if (!(git_reference_is_branch(refs[i]) && j == 0) &&
 939                             !(git_reference_is_tag(refs[i]) && j == 1))
 940                                 continue;
 941
 942                         switch (git_reference_type(refs[i])) {
 943                         case GIT_REF_SYMBOLIC:
 944                                 if (git_reference_resolve(&dref, refs[i]))
 945                                         goto err;
 946                                 r = dref;
 947                                 break;
 948                         case GIT_REF_OID:
 949                                 r = refs[i];
 950                                 break;
 951                         default:
 952                                 continue;
 953                         }
 954                         if (!(id = git_reference_target(r)))
 955                                 goto err;
 956                         if (git_reference_peel(&obj, r, GIT_OBJ_ANY))
 957                                 goto err;
 958                         if (!(id = git_object_id(obj)))
 959                                 goto err;
 960                         if (!(ci = commitinfo_getbyoid(id)))
 961                                 break;
 962
 963                         /* print header if it has an entry (first). */
 964                         if (++count == 1) {
 965                                 fprintf(fp, "<h2>%s</h2><table id=\"%s\"><thead>\n<tr><td>Name</td>"
 966                                       "<td>Last commit date</td><td>Author</td>\n</tr>\n</thead><tbody>\n",
 967                                       titles[j], ids[j]);
 968                         }
 969
 970                         relpath = "";
 971                         name = git_reference_shorthand(r);
 972
 973                         fputs("<tr><td>", fp);
 974                         xmlencode(fp, name, strlen(name));
 975                         fputs("</td><td>", fp);
 976                         if (ci->author)
 977                                 printtimeshort(fp, &(ci->author->when));
 978                         fputs("</td><td>", fp);
 979                         if (ci->author)
 980                                 xmlencode(fp, ci->author->name, strlen(ci->author->name));
 981                         fputs("</td></tr>\n", fp);
 982
 983                         relpath = "../";
 984
 985                         commitinfo_free(ci);
 986                         git_object_free(obj);
 987                         obj = NULL;
 988                         git_reference_free(dref);
 989                         dref = NULL;
 990                 }
 991                 /* table footer */
 992                 if (count)
 993                         fputs("</tbody></table><br/>", fp);
 994         }
 995
 996 err:
 997         git_object_free(obj);
 998         git_reference_free(dref);
 999
1000         for (i = 0; i < refcount; i++)
1001                 git_reference_free(refs[i]);
1002         free(refs);
1003
1004         return 0;
1005 }
1006
1007 void
1008 joinpath(char *buf, size_t bufsiz, const char *path, const char *path2)
1009 {
1010         int r;
1011
1012         r = snprintf(buf, bufsiz, "%s%s%s",
1013                 repodir, path[0] && path[strlen(path) - 1] != '/' ? "/" : "", path2);
1014         if (r == -1 || (size_t)r >= bufsiz)
1015                 errx(1, "path truncated: '%s%s%s'",
1016                         path, path[0] && path[strlen(path) - 1] != '/' ? "/" : "", path2);
1017 }
1018
1019 void
1020 usage(char *argv0)
1021 {
1022         fprintf(stderr, "%s [-c cachefile] repodir\n", argv0);
1023         exit(1);
1024 }
1025
1026 int
1027 main(int argc, char *argv[])
1028 {
1029         git_object *obj = NULL;
1030         const git_oid *head = NULL;
1031         const git_error *e = NULL;
1032         FILE *fp, *fpread;
1033         char path[PATH_MAX], repodirabs[PATH_MAX + 1], *p;
1034         char tmppath[64] = "cache.XXXXXXXXXXXX", buf[BUFSIZ];
1035         size_t n;
1036         int i, fd;
1037
1038         for (i = 1; i < argc; i++) {
1039                 if (argv[i][0] != '-') {
1040                         if (repodir)
1041                                 usage(argv[0]);
1042                         repodir = argv[i];
1043                 } else if (argv[i][1] == 'c') {
1044                         if (i + 1 >= argc)
1045                                 usage(argv[0]);
1046                         cachefile = argv[++i];
1047                 }
1048         }
1049         if (!repodir)
1050                 usage(argv[0]);
1051
1052         if (!realpath(repodir, repodirabs))
1053                 err(1, "realpath");
1054
1055         git_libgit2_init();
1056
1057         if (git_repository_open_ext(&repo, repodir,
1058                 GIT_REPOSITORY_OPEN_NO_SEARCH, NULL) < 0) {
1059                 e = giterr_last();
1060                 fprintf(stderr, "%s: %s\n", argv[0], e->message);
1061                 return 1;
1062         }
1063
1064         /* find HEAD */
1065         if (git_revparse_single(&obj, repo, "HEAD"))
1066                 return 1;
1067         head = git_object_id(obj);
1068         git_object_free(obj);
1069
1070         /* use directory name as name */
1071         if ((name = strrchr(repodirabs, '/')))
1072                 name++;
1073         else
1074                 name = "";
1075
1076         /* strip .git suffix */
1077         if (!(stripped_name = strdup(name)))
1078                 err(1, "strdup");
1079         if ((p = strrchr(stripped_name, '.')))
1080                 if (!strcmp(p, ".git"))
1081                         *p = '\0';
1082
1083         /* read description or .git/description */
1084         joinpath(path, sizeof(path), repodir, "description");
1085         if (!(fpread = fopen(path, "r"))) {
1086                 joinpath(path, sizeof(path), repodir, ".git/description");
1087                 fpread = fopen(path, "r");
1088         }
1089         if (fpread) {
1090                 if (!fgets(description, sizeof(description), fpread))
1091                         description[0] = '\0';
1092                 fclose(fpread);
1093         }
1094
1095         /* read url or .git/url */
1096         joinpath(path, sizeof(path), repodir, "url");
1097         if (!(fpread = fopen(path, "r"))) {
1098                 joinpath(path, sizeof(path), repodir, ".git/url");
1099                 fpread = fopen(path, "r");
1100         }
1101         if (fpread) {
1102                 if (!fgets(cloneurl, sizeof(cloneurl), fpread))
1103                         cloneurl[0] = '\0';
1104                 cloneurl[strcspn(cloneurl, "\n")] = '\0';
1105                 fclose(fpread);
1106         }
1107
1108         /* check LICENSE */
1109         haslicense = !git_revparse_single(&obj, repo, "HEAD:LICENSE");
1110         git_object_free(obj);
1111         /* check README */
1112         hasreadme = !git_revparse_single(&obj, repo, "HEAD:README");
1113         git_object_free(obj);
1114         hassubmodules = !git_revparse_single(&obj, repo, "HEAD:.gitmodules");
1115         git_object_free(obj);
1116
1117         /* log for HEAD */
1118         fp = efopen("log.html", "w");
1119         relpath = "";
1120         mkdir("commit", 0755);
1121         writeheader(fp, "Log");
1122         fputs("<table id=\"log\"><thead>\n<tr><td>Date</td><td>Commit message</td>"
1123                   "<td>Author</td><td class=\"num\">Files</td><td class=\"num\">+</td>"
1124                   "<td class=\"num\">-</td></tr>\n</thead><tbody>\n", fp);
1125
1126         if (cachefile) {
1127                 /* read from cache file (does not need to exist) */
1128                 if ((rcachefp = fopen(cachefile, "r"))) {
1129                         if (!fgets(lastoidstr, sizeof(lastoidstr), rcachefp))
1130                                 errx(1, "%s: no object id", cachefile);
1131                         if (git_oid_fromstr(&lastoid, lastoidstr))
1132                                 errx(1, "%s: invalid object id", cachefile);
1133                 }
1134
1135                 /* write log to (temporary) cache */
1136                 if ((fd = mkstemp(tmppath)) == -1)
1137                         err(1, "mkstemp");
1138                 if (!(wcachefp = fdopen(fd, "w")))
1139                         err(1, "fdopen");
1140                 /* write last commit id (HEAD) */
1141                 git_oid_tostr(buf, sizeof(buf), head);
1142                 fprintf(wcachefp, "%s\n", buf);
1143
1144                 writelog(fp, head);
1145
1146                 if (rcachefp) {
1147                         /* append previous log to log.html and the new cache */
1148                         while (!feof(rcachefp)) {
1149                                 n = fread(buf, 1, sizeof(buf), rcachefp);
1150                                 if (ferror(rcachefp))
1151                                         err(1, "fread");
1152                                 if (fwrite(buf, 1, n, fp) != n)
1153                                         err(1, "fwrite");
1154                                 if (fwrite(buf, 1, n, wcachefp) != n)
1155                                         err(1, "fwrite");
1156                         }
1157                         fclose(rcachefp);
1158                 }
1159                 fclose(wcachefp);
1160         } else {
1161                 writelog(fp, head);
1162         }
1163
1164         fputs("</tbody></table>", fp);
1165         writefooter(fp);
1166         fclose(fp);
1167
1168         /* files for HEAD */
1169         fp = efopen("files.html", "w");
1170         writeheader(fp, "Files");
1171         writefiles(fp, head, "HEAD");
1172         writefooter(fp);
1173         fclose(fp);
1174
1175         /* summary page with branches and tags */
1176         fp = efopen("refs.html", "w");
1177         writeheader(fp, "Refs");
1178         writerefs(fp);
1179         writefooter(fp);
1180         fclose(fp);
1181
1182         /* Atom feed */
1183         fp = efopen("atom.xml", "w");
1184         writeatom(fp);
1185         fclose(fp);
1186
1187         /* rename new cache file on success */
1188         if (cachefile && rename(tmppath, cachefile))
1189                 err(1, "rename: '%s' to '%s'", tmppath, cachefile);
1190
1191         /* cleanup */
1192         git_repository_free(repo);
1193         git_libgit2_shutdown();
1194
1195         return 0;
1196 }