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[ps-cgit] / ui-shared.c
1 /* ui-shared.c: common web output functions
2  *
3  * Copyright (C) 2006-2017 cgit Development Team <cgit@lists.zx2c4.com>
4  *
5  * Licensed under GNU General Public License v2
6  *   (see COPYING for full license text)
7  */
8
9 #include "cgit.h"
10 #include "ui-shared.h"
11 #include "cmd.h"
12 #include "html.h"
13 #include "version.h"
14
15 static const char cgit_doctype[] =
16 "<!DOCTYPE html>\n";
17
18 static char *http_date(time_t t)
19 {
20         static char day[][4] =
21                 {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
22         static char month[][4] =
23                 {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
24                  "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
25         struct tm *tm = gmtime(&t);
26         return fmt("%s, %02d %s %04d %02d:%02d:%02d GMT", day[tm->tm_wday],
27                    tm->tm_mday, month[tm->tm_mon], 1900 + tm->tm_year,
28                    tm->tm_hour, tm->tm_min, tm->tm_sec);
29 }
30
31 void cgit_print_error(const char *fmt, ...)
32 {
33         va_list ap;
34         va_start(ap, fmt);
35         cgit_vprint_error(fmt, ap);
36         va_end(ap);
37 }
38
39 void cgit_vprint_error(const char *fmt, va_list ap)
40 {
41         va_list cp;
42         html("<div class='error'>");
43         va_copy(cp, ap);
44         html_vtxtf(fmt, cp);
45         va_end(cp);
46         html("</div>\n");
47 }
48
49 const char *cgit_httpscheme(void)
50 {
51         if (ctx.env.https && !strcmp(ctx.env.https, "on"))
52                 return "https://";
53         else
54                 return "http://";
55 }
56
57 char *cgit_hosturl(void)
58 {
59         if (ctx.env.http_host)
60                 return xstrdup(ctx.env.http_host);
61         if (!ctx.env.server_name)
62                 return NULL;
63         if (!ctx.env.server_port || atoi(ctx.env.server_port) == 80)
64                 return xstrdup(ctx.env.server_name);
65         return fmtalloc("%s:%s", ctx.env.server_name, ctx.env.server_port);
66 }
67
68 char *cgit_currenturl(void)
69 {
70         const char *root = cgit_rooturl();
71
72         if (!ctx.qry.url)
73                 return xstrdup(root);
74         if (root[0] && root[strlen(root) - 1] == '/')
75                 return fmtalloc("%s%s", root, ctx.qry.url);
76         return fmtalloc("%s/%s", root, ctx.qry.url);
77 }
78
79 char *cgit_currentfullurl(void)
80 {
81         const char *root = cgit_rooturl();
82         const char *orig_query = ctx.env.query_string ? ctx.env.query_string : "";
83         size_t len = strlen(orig_query);
84         char *query = xmalloc(len + 2), *start_url, *ret;
85
86         /* Remove all url=... parts from query string */
87         memcpy(query + 1, orig_query, len + 1);
88         query[0] = '?';
89         start_url = query;
90         while ((start_url = strstr(start_url, "url=")) != NULL) {
91                 if (start_url[-1] == '?' || start_url[-1] == '&') {
92                         const char *end_url = strchr(start_url, '&');
93                         if (end_url)
94                                 memmove(start_url, end_url + 1, strlen(end_url));
95                         else
96                                 start_url[0] = '\0';
97                 } else
98                         ++start_url;
99         }
100         if (!query[1])
101                 query[0] = '\0';
102
103         if (!ctx.qry.url)
104                 ret = fmtalloc("%s%s", root, query);
105         else if (root[0] && root[strlen(root) - 1] == '/')
106                 ret = fmtalloc("%s%s%s", root, ctx.qry.url, query);
107         else
108                 ret = fmtalloc("%s/%s%s", root, ctx.qry.url, query);
109         free(query);
110         return ret;
111 }
112
113 const char *cgit_rooturl(void)
114 {
115         if (ctx.cfg.virtual_root)
116                 return ctx.cfg.virtual_root;
117         else
118                 return ctx.cfg.script_name;
119 }
120
121 const char *cgit_loginurl(void)
122 {
123         static const char *login_url;
124         if (!login_url)
125                 login_url = fmtalloc("%s?p=login", cgit_rooturl());
126         return login_url;
127 }
128
129 char *cgit_repourl(const char *reponame)
130 {
131         if (ctx.cfg.virtual_root)
132                 return fmtalloc("%s%s/", ctx.cfg.virtual_root, reponame);
133         else
134                 return fmtalloc("?r=%s", reponame);
135 }
136
137 char *cgit_fileurl(const char *reponame, const char *pagename,
138                    const char *filename, const char *query)
139 {
140         struct strbuf sb = STRBUF_INIT;
141         char *delim;
142
143         if (ctx.cfg.virtual_root) {
144                 strbuf_addf(&sb, "%s%s/%s/%s", ctx.cfg.virtual_root, reponame,
145                             pagename, (filename ? filename:""));
146                 delim = "?";
147         } else {
148                 strbuf_addf(&sb, "?url=%s/%s/%s", reponame, pagename,
149                             (filename ? filename : ""));
150                 delim = "&amp;";
151         }
152         if (query)
153                 strbuf_addf(&sb, "%s%s", delim, query);
154         return strbuf_detach(&sb, NULL);
155 }
156
157 char *cgit_pageurl(const char *reponame, const char *pagename,
158                    const char *query)
159 {
160         return cgit_fileurl(reponame, pagename, NULL, query);
161 }
162
163 const char *cgit_repobasename(const char *reponame)
164 {
165         /* I assume we don't need to store more than one repo basename */
166         static char rvbuf[1024];
167         int p;
168         const char *rv;
169         size_t len;
170
171         len = strlcpy(rvbuf, reponame, sizeof(rvbuf));
172         if (len >= sizeof(rvbuf))
173                 die("cgit_repobasename: truncated repository name '%s'", reponame);
174         p = len - 1;
175         /* strip trailing slashes */
176         while (p && rvbuf[p] == '/')
177                 rvbuf[p--] = '\0';
178         /* strip trailing .git */
179         if (p >= 3 && starts_with(&rvbuf[p-3], ".git")) {
180                 p -= 3;
181                 rvbuf[p--] = '\0';
182         }
183         /* strip more trailing slashes if any */
184         while (p && rvbuf[p] == '/')
185                 rvbuf[p--] = '\0';
186         /* find last slash in the remaining string */
187         rv = strrchr(rvbuf, '/');
188         if (rv)
189                 return ++rv;
190         return rvbuf;
191 }
192
193 const char *cgit_snapshot_prefix(const struct cgit_repo *repo)
194 {
195         if (repo->snapshot_prefix)
196                 return repo->snapshot_prefix;
197
198         return cgit_repobasename(repo->url);
199 }
200
201 static void site_url(const char *page, const char *search, const char *sort, int ofs, int always_root)
202 {
203         char *delim = "?";
204
205         if (always_root || page)
206                 html_attr(cgit_rooturl());
207         else {
208                 char *currenturl = cgit_currenturl();
209                 html_attr(currenturl);
210                 free(currenturl);
211         }
212
213         if (page) {
214                 htmlf("?p=%s", page);
215                 delim = "&amp;";
216         }
217         if (search) {
218                 html(delim);
219                 html("q=");
220                 html_attr(search);
221                 delim = "&amp;";
222         }
223         if (sort) {
224                 html(delim);
225                 html("s=");
226                 html_attr(sort);
227                 delim = "&amp;";
228         }
229         if (ofs) {
230                 html(delim);
231                 htmlf("ofs=%d", ofs);
232         }
233 }
234
235 static void site_link(const char *page, const char *name, const char *title,
236                       const char *class, const char *search, const char *sort, int ofs, int always_root)
237 {
238         html("<a");
239         if (title) {
240                 html(" title='");
241                 html_attr(title);
242                 html("'");
243         }
244         if (class) {
245                 html(" class='");
246                 html_attr(class);
247                 html("'");
248         }
249         html(" href='");
250         site_url(page, search, sort, ofs, always_root);
251         html("'>");
252         html_txt(name);
253         html("</a>");
254 }
255
256 void cgit_index_link(const char *name, const char *title, const char *class,
257                      const char *pattern, const char *sort, int ofs, int always_root)
258 {
259         site_link(NULL, name, title, class, pattern, sort, ofs, always_root);
260 }
261
262 static char *repolink(const char *title, const char *class, const char *page,
263                       const char *head, const char *path)
264 {
265         char *delim = "?";
266
267         html("<a");
268         if (title) {
269                 html(" title='");
270                 html_attr(title);
271                 html("'");
272         }
273         if (class) {
274                 html(" class='");
275                 html_attr(class);
276                 html("'");
277         }
278         html(" href='");
279         if (ctx.cfg.virtual_root) {
280                 html_url_path(ctx.cfg.virtual_root);
281                 html_url_path(ctx.repo->url);
282                 if (ctx.repo->url[strlen(ctx.repo->url) - 1] != '/')
283                         html("/");
284                 if (page) {
285                         html_url_path(page);
286                         html("/");
287                         if (path)
288                                 html_url_path(path);
289                 }
290         } else {
291                 html_url_path(ctx.cfg.script_name);
292                 html("?url=");
293                 html_url_arg(ctx.repo->url);
294                 if (ctx.repo->url[strlen(ctx.repo->url) - 1] != '/')
295                         html("/");
296                 if (page) {
297                         html_url_arg(page);
298                         html("/");
299                         if (path)
300                                 html_url_arg(path);
301                 }
302                 delim = "&amp;";
303         }
304         if (head && ctx.repo->defbranch && strcmp(head, ctx.repo->defbranch)) {
305                 html(delim);
306                 html("h=");
307                 html_url_arg(head);
308                 delim = "&amp;";
309         }
310         return fmt("%s", delim);
311 }
312
313 static void reporevlink(const char *page, const char *name, const char *title,
314                         const char *class, const char *head, const char *rev,
315                         const char *path)
316 {
317         char *delim;
318
319         delim = repolink(title, class, page, head, path);
320         if (rev && ctx.qry.head != NULL && strcmp(rev, ctx.qry.head)) {
321                 html(delim);
322                 html("id=");
323                 html_url_arg(rev);
324         }
325         html("'>");
326         html_txt(name);
327         html("</a>");
328 }
329
330 void cgit_summary_link(const char *name, const char *title, const char *class,
331                        const char *head)
332 {
333         reporevlink(NULL, name, title, class, head, NULL, NULL);
334 }
335
336 void cgit_tag_link(const char *name, const char *title, const char *class,
337                    const char *tag)
338 {
339         reporevlink("tag", name, title, class, tag, NULL, NULL);
340 }
341
342 void cgit_tree_link(const char *name, const char *title, const char *class,
343                     const char *head, const char *rev, const char *path)
344 {
345         reporevlink("tree", name, title, class, head, rev, path);
346 }
347
348 void cgit_plain_link(const char *name, const char *title, const char *class,
349                      const char *head, const char *rev, const char *path)
350 {
351         reporevlink("plain", name, title, class, head, rev, path);
352 }
353
354 void cgit_blame_link(const char *name, const char *title, const char *class,
355                      const char *head, const char *rev, const char *path)
356 {
357         reporevlink("blame", name, title, class, head, rev, path);
358 }
359
360 void cgit_log_link(const char *name, const char *title, const char *class,
361                    const char *head, const char *rev, const char *path,
362                    int ofs, const char *grep, const char *pattern, int showmsg,
363                    int follow)
364 {
365         char *delim;
366
367         delim = repolink(title, class, "log", head, path);
368         if (rev && ctx.qry.head && strcmp(rev, ctx.qry.head)) {
369                 html(delim);
370                 html("id=");
371                 html_url_arg(rev);
372                 delim = "&amp;";
373         }
374         if (grep && pattern) {
375                 html(delim);
376                 html("qt=");
377                 html_url_arg(grep);
378                 delim = "&amp;";
379                 html(delim);
380                 html("q=");
381                 html_url_arg(pattern);
382         }
383         if (ofs > 0) {
384                 html(delim);
385                 html("ofs=");
386                 htmlf("%d", ofs);
387                 delim = "&amp;";
388         }
389         if (showmsg) {
390                 html(delim);
391                 html("showmsg=1");
392                 delim = "&amp;";
393         }
394         if (follow) {
395                 html(delim);
396                 html("follow=1");
397         }
398         html("'>");
399         html_txt(name);
400         html("</a>");
401 }
402
403 void cgit_commit_link(const char *name, const char *title, const char *class,
404                       const char *head, const char *rev, const char *path)
405 {
406         char *delim;
407
408         delim = repolink(title, class, "commit", head, path);
409         if (rev && ctx.qry.head && strcmp(rev, ctx.qry.head)) {
410                 html(delim);
411                 html("id=");
412                 html_url_arg(rev);
413                 delim = "&amp;";
414         }
415         if (ctx.qry.difftype) {
416                 html(delim);
417                 htmlf("dt=%d", ctx.qry.difftype);
418                 delim = "&amp;";
419         }
420         if (ctx.qry.context > 0 && ctx.qry.context != 3) {
421                 html(delim);
422                 html("context=");
423                 htmlf("%d", ctx.qry.context);
424                 delim = "&amp;";
425         }
426         if (ctx.qry.ignorews) {
427                 html(delim);
428                 html("ignorews=1");
429                 delim = "&amp;";
430         }
431         if (ctx.qry.follow) {
432                 html(delim);
433                 html("follow=1");
434         }
435         html("'>");
436         if (name[0] != '\0') {
437                 if (strlen(name) > ctx.cfg.max_msg_len && ctx.cfg.max_msg_len >= 15) {
438                         html_ntxt(name, ctx.cfg.max_msg_len - 3);
439                         html("...");
440                 } else
441                         html_txt(name);
442         } else
443                 html_txt("(no commit message)");
444         html("</a>");
445 }
446
447 void cgit_refs_link(const char *name, const char *title, const char *class,
448                     const char *head, const char *rev, const char *path)
449 {
450         reporevlink("refs", name, title, class, head, rev, path);
451 }
452
453 void cgit_snapshot_link(const char *name, const char *title, const char *class,
454                         const char *head, const char *rev,
455                         const char *archivename)
456 {
457         reporevlink("snapshot", name, title, class, head, rev, archivename);
458 }
459
460 void cgit_diff_link(const char *name, const char *title, const char *class,
461                     const char *head, const char *new_rev, const char *old_rev,
462                     const char *path)
463 {
464         char *delim;
465
466         delim = repolink(title, class, "diff", head, path);
467         if (new_rev && ctx.qry.head != NULL && strcmp(new_rev, ctx.qry.head)) {
468                 html(delim);
469                 html("id=");
470                 html_url_arg(new_rev);
471                 delim = "&amp;";
472         }
473         if (old_rev) {
474                 html(delim);
475                 html("id2=");
476                 html_url_arg(old_rev);
477                 delim = "&amp;";
478         }
479         if (ctx.qry.difftype) {
480                 html(delim);
481                 htmlf("dt=%d", ctx.qry.difftype);
482                 delim = "&amp;";
483         }
484         if (ctx.qry.context > 0 && ctx.qry.context != 3) {
485                 html(delim);
486                 html("context=");
487                 htmlf("%d", ctx.qry.context);
488                 delim = "&amp;";
489         }
490         if (ctx.qry.ignorews) {
491                 html(delim);
492                 html("ignorews=1");
493                 delim = "&amp;";
494         }
495         if (ctx.qry.follow) {
496                 html(delim);
497                 html("follow=1");
498         }
499         html("'>");
500         html_txt(name);
501         html("</a>");
502 }
503
504 void cgit_patch_link(const char *name, const char *title, const char *class,
505                      const char *head, const char *rev, const char *path)
506 {
507         reporevlink("patch", name, title, class, head, rev, path);
508 }
509
510 void cgit_stats_link(const char *name, const char *title, const char *class,
511                      const char *head, const char *path)
512 {
513         reporevlink("stats", name, title, class, head, NULL, path);
514 }
515
516 static void cgit_self_link(char *name, const char *title, const char *class)
517 {
518         if (!strcmp(ctx.qry.page, "repolist"))
519                 cgit_index_link(name, title, class, ctx.qry.search, ctx.qry.sort,
520                                 ctx.qry.ofs, 1);
521         else if (!strcmp(ctx.qry.page, "summary"))
522                 cgit_summary_link(name, title, class, ctx.qry.head);
523         else if (!strcmp(ctx.qry.page, "tag"))
524                 cgit_tag_link(name, title, class, ctx.qry.has_oid ?
525                                ctx.qry.oid : ctx.qry.head);
526         else if (!strcmp(ctx.qry.page, "tree"))
527                 cgit_tree_link(name, title, class, ctx.qry.head,
528                                ctx.qry.has_oid ? ctx.qry.oid : NULL,
529                                ctx.qry.path);
530         else if (!strcmp(ctx.qry.page, "plain"))
531                 cgit_plain_link(name, title, class, ctx.qry.head,
532                                 ctx.qry.has_oid ? ctx.qry.oid : NULL,
533                                 ctx.qry.path);
534         else if (!strcmp(ctx.qry.page, "blame"))
535                 cgit_blame_link(name, title, class, ctx.qry.head,
536                                 ctx.qry.has_oid ? ctx.qry.oid : NULL,
537                                 ctx.qry.path);
538         else if (!strcmp(ctx.qry.page, "log"))
539                 cgit_log_link(name, title, class, ctx.qry.head,
540                               ctx.qry.has_oid ? ctx.qry.oid : NULL,
541                               ctx.qry.path, ctx.qry.ofs,
542                               ctx.qry.grep, ctx.qry.search,
543                               ctx.qry.showmsg, ctx.qry.follow);
544         else if (!strcmp(ctx.qry.page, "commit"))
545                 cgit_commit_link(name, title, class, ctx.qry.head,
546                                  ctx.qry.has_oid ? ctx.qry.oid : NULL,
547                                  ctx.qry.path);
548         else if (!strcmp(ctx.qry.page, "patch"))
549                 cgit_patch_link(name, title, class, ctx.qry.head,
550                                 ctx.qry.has_oid ? ctx.qry.oid : NULL,
551                                 ctx.qry.path);
552         else if (!strcmp(ctx.qry.page, "refs"))
553                 cgit_refs_link(name, title, class, ctx.qry.head,
554                                ctx.qry.has_oid ? ctx.qry.oid : NULL,
555                                ctx.qry.path);
556         else if (!strcmp(ctx.qry.page, "snapshot"))
557                 cgit_snapshot_link(name, title, class, ctx.qry.head,
558                                    ctx.qry.has_oid ? ctx.qry.oid : NULL,
559                                    ctx.qry.path);
560         else if (!strcmp(ctx.qry.page, "diff"))
561                 cgit_diff_link(name, title, class, ctx.qry.head,
562                                ctx.qry.oid, ctx.qry.oid2,
563                                ctx.qry.path);
564         else if (!strcmp(ctx.qry.page, "stats"))
565                 cgit_stats_link(name, title, class, ctx.qry.head,
566                                 ctx.qry.path);
567         else {
568                 /* Don't known how to make link for this page */
569                 repolink(title, class, ctx.qry.page, ctx.qry.head, ctx.qry.path);
570                 html("><!-- cgit_self_link() doesn't know how to make link for page '");
571                 html_txt(ctx.qry.page);
572                 html("' -->");
573                 html_txt(name);
574                 html("</a>");
575         }
576 }
577
578 void cgit_object_link(struct object *obj)
579 {
580         char *page, *shortrev, *fullrev, *name;
581
582         fullrev = oid_to_hex(&obj->oid);
583         shortrev = xstrdup(fullrev);
584         shortrev[10] = '\0';
585         if (obj->type == OBJ_COMMIT) {
586                 cgit_commit_link(fmt("commit %s...", shortrev), NULL, NULL,
587                                  ctx.qry.head, fullrev, NULL);
588                 return;
589         } else if (obj->type == OBJ_TREE)
590                 page = "tree";
591         else if (obj->type == OBJ_TAG)
592                 page = "tag";
593         else
594                 page = "blob";
595         name = fmt("%s %s...", type_name(obj->type), shortrev);
596         reporevlink(page, name, NULL, NULL, ctx.qry.head, fullrev, NULL);
597 }
598
599 static struct string_list_item *lookup_path(struct string_list *list,
600                                             const char *path)
601 {
602         struct string_list_item *item;
603
604         while (path && path[0]) {
605                 if ((item = string_list_lookup(list, path)))
606                         return item;
607                 if (!(path = strchr(path, '/')))
608                         break;
609                 path++;
610         }
611         return NULL;
612 }
613
614 void cgit_submodule_link(const char *class, char *path, const char *rev)
615 {
616         struct string_list *list;
617         struct string_list_item *item;
618         char tail, *dir;
619         size_t len;
620
621         len = 0;
622         tail = 0;
623         list = &ctx.repo->submodules;
624         item = lookup_path(list, path);
625         if (!item) {
626                 len = strlen(path);
627                 tail = path[len - 1];
628                 if (tail == '/') {
629                         path[len - 1] = 0;
630                         item = lookup_path(list, path);
631                 }
632         }
633         if (item || ctx.repo->module_link) {
634                 html("<a ");
635                 if (class)
636                         htmlf("class='%s' ", class);
637                 html("href='");
638                 if (item) {
639                         html_attrf(item->util, rev);
640                 } else {
641                         dir = strrchr(path, '/');
642                         if (dir)
643                                 dir++;
644                         else
645                                 dir = path;
646                         html_attrf(ctx.repo->module_link, dir, rev);
647                 }
648                 html("'>");
649                 html_txt(path);
650                 html("</a>");
651         } else {
652                 html("<span");
653                 if (class)
654                         htmlf(" class='%s'", class);
655                 html(">");
656                 html_txt(path);
657                 html("</span>");
658         }
659         html_txtf(" @ %.7s", rev);
660         if (item && tail)
661                 path[len - 1] = tail;
662 }
663
664 const struct date_mode *cgit_date_mode(enum date_mode_type type)
665 {
666         static struct date_mode mode;
667         mode.type = type;
668         mode.local = ctx.cfg.local_time;
669         return &mode;
670 }
671
672 static void print_rel_date(time_t t, int tz, double value,
673         const char *class, const char *suffix)
674 {
675         htmlf("<span class='%s' title='", class);
676         html_attr(show_date(t, tz, cgit_date_mode(DATE_ISO8601)));
677         htmlf("'>%.0f %s</span>", value, suffix);
678 }
679
680 void cgit_print_age(time_t t, int tz, time_t max_relative)
681 {
682         time_t now, secs;
683
684         if (!t)
685                 return;
686         time(&now);
687         secs = now - t;
688         if (secs < 0)
689                 secs = 0;
690
691         if (secs > max_relative && max_relative >= 0) {
692                 html("<span title='");
693                 html_attr(show_date(t, tz, cgit_date_mode(DATE_ISO8601)));
694                 html("'>");
695                 html_txt(show_date(t, tz, cgit_date_mode(DATE_SHORT)));
696                 html("</span>");
697                 return;
698         }
699
700         if (secs < TM_HOUR * 2) {
701                 print_rel_date(t, tz, secs * 1.0 / TM_MIN, "age-mins", "min.");
702                 return;
703         }
704         if (secs < TM_DAY * 2) {
705                 print_rel_date(t, tz, secs * 1.0 / TM_HOUR, "age-hours", "hours");
706                 return;
707         }
708         if (secs < TM_WEEK * 2) {
709                 print_rel_date(t, tz, secs * 1.0 / TM_DAY, "age-days", "days");
710                 return;
711         }
712         if (secs < TM_MONTH * 2) {
713                 print_rel_date(t, tz, secs * 1.0 / TM_WEEK, "age-weeks", "weeks");
714                 return;
715         }
716         if (secs < TM_YEAR * 2) {
717                 print_rel_date(t, tz, secs * 1.0 / TM_MONTH, "age-months", "months");
718                 return;
719         }
720         print_rel_date(t, tz, secs * 1.0 / TM_YEAR, "age-years", "years");
721 }
722
723 void cgit_print_http_headers(void)
724 {
725         if (ctx.env.no_http && !strcmp(ctx.env.no_http, "1"))
726                 return;
727
728         if (ctx.page.status)
729                 htmlf("Status: %d %s\n", ctx.page.status, ctx.page.statusmsg);
730         if (ctx.page.mimetype && ctx.page.charset)
731                 htmlf("Content-Type: %s; charset=%s\n", ctx.page.mimetype,
732                       ctx.page.charset);
733         else if (ctx.page.mimetype)
734                 htmlf("Content-Type: %s\n", ctx.page.mimetype);
735         if (ctx.page.size)
736                 htmlf("Content-Length: %zd\n", ctx.page.size);
737         if (ctx.page.filename) {
738                 html("Content-Disposition: inline; filename=\"");
739                 html_header_arg_in_quotes(ctx.page.filename);
740                 html("\"\n");
741         }
742         if (!ctx.env.authenticated)
743                 html("Cache-Control: no-cache, no-store\n");
744         htmlf("Last-Modified: %s\n", http_date(ctx.page.modified));
745         htmlf("Expires: %s\n", http_date(ctx.page.expires));
746         if (ctx.page.etag)
747                 htmlf("ETag: \"%s\"\n", ctx.page.etag);
748         html("\n");
749         if (ctx.env.request_method && !strcmp(ctx.env.request_method, "HEAD"))
750                 exit(0);
751 }
752
753 void cgit_redirect(const char *url, bool permanent)
754 {
755         htmlf("Status: %d %s\n", permanent ? 301 : 302, permanent ? "Moved" : "Found");
756         html("Location: ");
757         html_url_path(url);
758         html("\n\n");
759 }
760
761 static void print_rel_vcs_link(const char *url)
762 {
763         html("<link rel='vcs-git' href='");
764         html_attr(url);
765         html("' title='");
766         html_attr(ctx.repo->name);
767         html(" Git repository'/>\n");
768 }
769
770 void cgit_print_docstart(void)
771 {
772         char *host = cgit_hosturl();
773
774         if (ctx.cfg.embedded) {
775                 if (ctx.cfg.header)
776                         html_include(ctx.cfg.header);
777                 return;
778         }
779
780         html(cgit_doctype);
781         html("<html lang='en'>\n");
782         html("<head>\n");
783         html("<title>");
784         html_txt(ctx.page.title);
785         html("</title>\n");
786         htmlf("<meta name='generator' content='cgit %s'/>\n", cgit_version);
787         if (ctx.cfg.robots && *ctx.cfg.robots)
788                 htmlf("<meta name='robots' content='%s'/>\n", ctx.cfg.robots);
789         html("<link rel='stylesheet' type='text/css' href='");
790         html_attr(ctx.cfg.css);
791         html("'/>\n");
792         if (ctx.cfg.favicon) {
793                 html("<link rel='shortcut icon' href='");
794                 html_attr(ctx.cfg.favicon);
795                 html("'/>\n");
796         }
797         if (host && ctx.repo && ctx.qry.head) {
798                 char *fileurl;
799                 struct strbuf sb = STRBUF_INIT;
800                 strbuf_addf(&sb, "h=%s", ctx.qry.head);
801
802                 html("<link rel='alternate' title='Atom feed' href='");
803                 html(cgit_httpscheme());
804                 html_attr(host);
805                 fileurl = cgit_fileurl(ctx.repo->url, "atom", ctx.qry.vpath,
806                                        sb.buf);
807                 html_attr(fileurl);
808                 html("' type='application/atom+xml'/>\n");
809                 strbuf_release(&sb);
810                 free(fileurl);
811         }
812         if (ctx.repo)
813                 cgit_add_clone_urls(print_rel_vcs_link);
814         if (ctx.cfg.head_include)
815                 html_include(ctx.cfg.head_include);
816         if (ctx.repo && ctx.repo->extra_head_content)
817                 html(ctx.repo->extra_head_content);
818         html("</head>\n");
819         html("<body>\n");
820         if (ctx.cfg.header)
821                 html_include(ctx.cfg.header);
822         free(host);
823 }
824
825 void cgit_print_docend(void)
826 {
827         html("</div> <!-- class=content -->\n");
828         if (ctx.cfg.embedded) {
829                 html("</div> <!-- id=cgit -->\n");
830                 if (ctx.cfg.footer)
831                         html_include(ctx.cfg.footer);
832                 return;
833         }
834         if (ctx.cfg.footer)
835                 html_include(ctx.cfg.footer);
836         else {
837                 htmlf("<div class='footer'>generated by <a href='https://git.zx2c4.com/cgit/about/'>cgit %s</a> "
838                         "(<a href='https://git-scm.com/'>git %s</a>) at ", cgit_version, git_version_string);
839                 html_txt(show_date(time(NULL), 0, cgit_date_mode(DATE_ISO8601)));
840                 html("</div>\n");
841         }
842         html("</div> <!-- id=cgit -->\n");
843         html("</body>\n</html>\n");
844 }
845
846 void cgit_print_error_page(int code, const char *msg, const char *fmt, ...)
847 {
848         va_list ap;
849         ctx.page.expires = ctx.cfg.cache_dynamic_ttl;
850         ctx.page.status = code;
851         ctx.page.statusmsg = msg;
852         cgit_print_layout_start();
853         va_start(ap, fmt);
854         cgit_vprint_error(fmt, ap);
855         va_end(ap);
856         cgit_print_layout_end();
857 }
858
859 void cgit_print_layout_start(void)
860 {
861         cgit_print_http_headers();
862         cgit_print_docstart();
863         cgit_print_pageheader();
864 }
865
866 void cgit_print_layout_end(void)
867 {
868         cgit_print_docend();
869 }
870
871 static void add_clone_urls(void (*fn)(const char *), char *txt, char *suffix)
872 {
873         struct strbuf **url_list = strbuf_split_str(txt, ' ', 0);
874         int i;
875
876         for (i = 0; url_list[i]; i++) {
877                 strbuf_rtrim(url_list[i]);
878                 if (url_list[i]->len == 0)
879                         continue;
880                 if (suffix && *suffix)
881                         strbuf_addf(url_list[i], "/%s", suffix);
882                 fn(url_list[i]->buf);
883         }
884
885         strbuf_list_free(url_list);
886 }
887
888 void cgit_add_clone_urls(void (*fn)(const char *))
889 {
890         if (ctx.repo->clone_url)
891                 add_clone_urls(fn, expand_macros(ctx.repo->clone_url), NULL);
892         else if (ctx.cfg.clone_prefix)
893                 add_clone_urls(fn, ctx.cfg.clone_prefix, ctx.repo->url);
894 }
895
896 static int print_branch_option(const char *refname, const struct object_id *oid,
897                                int flags, void *cb_data)
898 {
899         char *name = (char *)refname;
900         html_option(name, name, ctx.qry.head);
901         return 0;
902 }
903
904 void cgit_add_hidden_formfields(int incl_head, int incl_search,
905                                 const char *page)
906 {
907         if (!ctx.cfg.virtual_root) {
908                 struct strbuf url = STRBUF_INIT;
909
910                 strbuf_addf(&url, "%s/%s", ctx.qry.repo, page);
911                 if (ctx.qry.vpath)
912                         strbuf_addf(&url, "/%s", ctx.qry.vpath);
913                 html_hidden("url", url.buf);
914                 strbuf_release(&url);
915         }
916
917         if (incl_head && ctx.qry.head && ctx.repo->defbranch &&
918             strcmp(ctx.qry.head, ctx.repo->defbranch))
919                 html_hidden("h", ctx.qry.head);
920
921         if (ctx.qry.oid)
922                 html_hidden("id", ctx.qry.oid);
923         if (ctx.qry.oid2)
924                 html_hidden("id2", ctx.qry.oid2);
925         if (ctx.qry.showmsg)
926                 html_hidden("showmsg", "1");
927
928         if (incl_search) {
929                 if (ctx.qry.grep)
930                         html_hidden("qt", ctx.qry.grep);
931                 if (ctx.qry.search)
932                         html_hidden("q", ctx.qry.search);
933         }
934 }
935
936 static const char *hc(const char *page)
937 {
938         if (!ctx.qry.page)
939                 return NULL;
940
941         return strcmp(ctx.qry.page, page) ? NULL : "active";
942 }
943
944 static void cgit_print_path_crumbs(char *path)
945 {
946         char *old_path = ctx.qry.path;
947         char *p = path, *q, *end = path + strlen(path);
948         int levels = 0;
949
950         ctx.qry.path = NULL;
951         cgit_self_link("root", NULL, NULL);
952         ctx.qry.path = p = path;
953         while (p < end) {
954                 if (!(q = strchr(p, '/')) || levels > 15)
955                         q = end;
956                 *q = '\0';
957                 html_txt("/");
958                 cgit_self_link(p, NULL, NULL);
959                 if (q < end)
960                         *q = '/';
961                 p = q + 1;
962                 ++levels;
963         }
964         ctx.qry.path = old_path;
965 }
966
967 static void print_header(void)
968 {
969         char *logo = NULL, *logo_link = NULL;
970
971         html("<table id='header'>\n");
972         html("<tr>\n");
973
974         if (ctx.repo && ctx.repo->logo && *ctx.repo->logo)
975                 logo = ctx.repo->logo;
976         else
977                 logo = ctx.cfg.logo;
978         if (ctx.repo && ctx.repo->logo_link && *ctx.repo->logo_link)
979                 logo_link = ctx.repo->logo_link;
980         else
981                 logo_link = ctx.cfg.logo_link;
982         if (logo && *logo) {
983                 html("<td class='logo' rowspan='2'><a href='");
984                 if (logo_link && *logo_link)
985                         html_attr(logo_link);
986                 else
987                         html_attr(cgit_rooturl());
988                 html("'><img src='");
989                 html_attr(logo);
990                 html("' alt='cgit logo'/></a></td>\n");
991         }
992
993         html("<td class='main'>");
994         if (ctx.repo) {
995                 cgit_index_link("index", NULL, NULL, NULL, NULL, 0, 1);
996                 html(" : ");
997                 cgit_summary_link(ctx.repo->name, ctx.repo->name, NULL, NULL);
998                 if (ctx.env.authenticated) {
999                         html("</td><td class='form'>");
1000                         html("<form method='get'>\n");
1001                         cgit_add_hidden_formfields(0, 1, ctx.qry.page);
1002                         html("<select name='h' onchange='this.form.submit();'>\n");
1003                         for_each_branch_ref(print_branch_option, ctx.qry.head);
1004                         if (ctx.repo->enable_remote_branches)
1005                                 for_each_remote_ref(print_branch_option, ctx.qry.head);
1006                         html("</select> ");
1007                         html("<input type='submit' value='switch'/>");
1008                         html("</form>");
1009                 }
1010         } else
1011                 html_txt(ctx.cfg.root_title);
1012         html("</td></tr>\n");
1013
1014         html("<tr><td class='sub'>");
1015         if (ctx.repo) {
1016                 html_txt(ctx.repo->desc);
1017                 html("</td><td class='sub right'>");
1018                 html_txt(ctx.repo->owner);
1019         } else {
1020                 if (ctx.cfg.root_desc)
1021                         html_txt(ctx.cfg.root_desc);
1022         }
1023         html("</td></tr></table>\n");
1024 }
1025
1026 void cgit_print_pageheader(void)
1027 {
1028         html("<div id='cgit'>");
1029         if (!ctx.env.authenticated || !ctx.cfg.noheader)
1030                 print_header();
1031
1032         html("<table class='tabs'><tr><td>\n");
1033         if (ctx.env.authenticated && ctx.repo) {
1034                 if (ctx.repo->readme.nr)
1035                         reporevlink("about", "about", NULL,
1036                                     hc("about"), ctx.qry.head, NULL,
1037                                     NULL);
1038                 cgit_summary_link("summary", NULL, hc("summary"),
1039                                   ctx.qry.head);
1040                 cgit_refs_link("refs", NULL, hc("refs"), ctx.qry.head,
1041                                ctx.qry.oid, NULL);
1042                 cgit_log_link("log", NULL, hc("log"), ctx.qry.head,
1043                               NULL, ctx.qry.vpath, 0, NULL, NULL,
1044                               ctx.qry.showmsg, ctx.qry.follow);
1045                 if (ctx.qry.page && !strcmp(ctx.qry.page, "blame"))
1046                         cgit_blame_link("blame", NULL, hc("blame"), ctx.qry.head,
1047                                         ctx.qry.oid, ctx.qry.vpath);
1048                 else
1049                         cgit_tree_link("tree", NULL, hc("tree"), ctx.qry.head,
1050                                        ctx.qry.oid, ctx.qry.vpath);
1051                 cgit_commit_link("commit", NULL, hc("commit"),
1052                                  ctx.qry.head, ctx.qry.oid, ctx.qry.vpath);
1053                 cgit_diff_link("diff", NULL, hc("diff"), ctx.qry.head,
1054                                ctx.qry.oid, ctx.qry.oid2, ctx.qry.vpath);
1055                 if (ctx.repo->max_stats)
1056                         cgit_stats_link("stats", NULL, hc("stats"),
1057                                         ctx.qry.head, ctx.qry.vpath);
1058                 if (ctx.repo->homepage) {
1059                         html("<a href='");
1060                         html_attr(ctx.repo->homepage);
1061                         html("'>homepage</a>");
1062                 }
1063                 html("</td><td class='form'>");
1064                 html("<form class='right' method='get' action='");
1065                 if (ctx.cfg.virtual_root) {
1066                         char *fileurl = cgit_fileurl(ctx.qry.repo, "log",
1067                                                    ctx.qry.vpath, NULL);
1068                         html_url_path(fileurl);
1069                         free(fileurl);
1070                 }
1071                 html("'>\n");
1072                 cgit_add_hidden_formfields(1, 0, "log");
1073                 html("<select name='qt'>\n");
1074                 html_option("grep", "log msg", ctx.qry.grep);
1075                 html_option("author", "author", ctx.qry.grep);
1076                 html_option("committer", "committer", ctx.qry.grep);
1077                 html_option("range", "range", ctx.qry.grep);
1078                 html("</select>\n");
1079                 html("<input class='txt' type='search' size='10' name='q' value='");
1080                 html_attr(ctx.qry.search);
1081                 html("'/>\n");
1082                 html("<input type='submit' value='search'/>\n");
1083                 html("</form>\n");
1084         } else if (ctx.env.authenticated) {
1085                 char *currenturl = cgit_currenturl();
1086                 site_link(NULL, "index", NULL, hc("repolist"), NULL, NULL, 0, 1);
1087                 if (ctx.cfg.root_readme)
1088                         site_link("about", "about", NULL, hc("about"),
1089                                   NULL, NULL, 0, 1);
1090                 html("</td><td class='form'>");
1091                 html("<form method='get' action='");
1092                 html_attr(currenturl);
1093                 html("'>\n");
1094                 html("<input type='search' name='q' size='10' value='");
1095                 html_attr(ctx.qry.search);
1096                 html("'/>\n");
1097                 html("<input type='submit' value='search'/>\n");
1098                 html("</form>");
1099                 free(currenturl);
1100         }
1101         html("</td></tr></table>\n");
1102         if (ctx.env.authenticated && ctx.repo && ctx.qry.vpath) {
1103                 html("<div class='path'>");
1104                 html("path: ");
1105                 cgit_print_path_crumbs(ctx.qry.vpath);
1106                 if (ctx.cfg.enable_follow_links && !strcmp(ctx.qry.page, "log")) {
1107                         html(" (");
1108                         ctx.qry.follow = !ctx.qry.follow;
1109                         cgit_self_link(ctx.qry.follow ? "follow" : "unfollow",
1110                                         NULL, NULL);
1111                         ctx.qry.follow = !ctx.qry.follow;
1112                         html(")");
1113                 }
1114                 html("</div>");
1115         }
1116         html("<div class='content'>");
1117 }
1118
1119 void cgit_print_filemode(unsigned short mode)
1120 {
1121         if (S_ISDIR(mode))
1122                 html("d");
1123         else if (S_ISLNK(mode))
1124                 html("l");
1125         else if (S_ISGITLINK(mode))
1126                 html("m");
1127         else
1128                 html("-");
1129         html_fileperm(mode >> 6);
1130         html_fileperm(mode >> 3);
1131         html_fileperm(mode);
1132 }
1133
1134 void cgit_compose_snapshot_prefix(struct strbuf *filename, const char *base,
1135                                   const char *ref)
1136 {
1137         struct object_id oid;
1138
1139         /*
1140          * Prettify snapshot names by stripping leading "v" or "V" if the tag
1141          * name starts with {v,V}[0-9] and the prettify mapping is injective,
1142          * i.e. each stripped tag can be inverted without ambiguities.
1143          */
1144         if (get_oid(fmt("refs/tags/%s", ref), &oid) == 0 &&
1145             (ref[0] == 'v' || ref[0] == 'V') && isdigit(ref[1]) &&
1146             ((get_oid(fmt("refs/tags/%s", ref + 1), &oid) == 0) +
1147              (get_oid(fmt("refs/tags/v%s", ref + 1), &oid) == 0) +
1148              (get_oid(fmt("refs/tags/V%s", ref + 1), &oid) == 0) == 1))
1149                 ref++;
1150
1151         strbuf_addf(filename, "%s-%s", base, ref);
1152 }
1153
1154 void cgit_print_snapshot_links(const struct cgit_repo *repo, const char *ref,
1155                                const char *separator)
1156 {
1157         const struct cgit_snapshot_format *f;
1158         struct strbuf filename = STRBUF_INIT;
1159         const char *basename;
1160         size_t prefixlen;
1161
1162         basename = cgit_snapshot_prefix(repo);
1163         if (starts_with(ref, basename))
1164                 strbuf_addstr(&filename, ref);
1165         else
1166                 cgit_compose_snapshot_prefix(&filename, basename, ref);
1167
1168         prefixlen = filename.len;
1169         for (f = cgit_snapshot_formats; f->suffix; f++) {
1170                 if (!(repo->snapshots & cgit_snapshot_format_bit(f)))
1171                         continue;
1172                 strbuf_setlen(&filename, prefixlen);
1173                 strbuf_addstr(&filename, f->suffix);
1174                 cgit_snapshot_link(filename.buf, NULL, NULL, NULL, NULL,
1175                                    filename.buf);
1176                 if (cgit_snapshot_get_sig(ref, f)) {
1177                         strbuf_addstr(&filename, ".asc");
1178                         html(" (");
1179                         cgit_snapshot_link("sig", NULL, NULL, NULL, NULL,
1180                                            filename.buf);
1181                         html(")");
1182                 } else if (starts_with(f->suffix, ".tar") && cgit_snapshot_get_sig(ref, &cgit_snapshot_formats[0])) {
1183                         strbuf_setlen(&filename, strlen(filename.buf) - strlen(f->suffix));
1184                         strbuf_addstr(&filename, ".tar.asc");
1185                         html(" (");
1186                         cgit_snapshot_link("sig", NULL, NULL, NULL, NULL,
1187                                            filename.buf);
1188                         html(")");
1189                 }
1190                 html(separator);
1191         }
1192         strbuf_release(&filename);
1193 }
1194
1195 void cgit_set_title_from_path(const char *path)
1196 {
1197         struct strbuf sb = STRBUF_INIT;
1198         const char *slash, *last_slash;
1199
1200         if (!path)
1201                 return;
1202
1203         for (last_slash = path + strlen(path); (slash = memrchr(path, '/', last_slash - path)) != NULL; last_slash = slash) {
1204                 strbuf_add(&sb, slash + 1, last_slash - slash - 1);
1205                 strbuf_addstr(&sb, " \xc2\xab ");
1206         }
1207         strbuf_add(&sb, path, last_slash - path);
1208         strbuf_addf(&sb, " - %s", ctx.page.title);
1209         ctx.page.title = strbuf_detach(&sb, NULL);
1210 }