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-rw-r--r--third_party/cgit/ui-shared.c1210
1 files changed, 1210 insertions, 0 deletions
diff --git a/third_party/cgit/ui-shared.c b/third_party/cgit/ui-shared.c
new file mode 100644
index 000000000000..d2358f292823
--- /dev/null
+++ b/third_party/cgit/ui-shared.c
@@ -0,0 +1,1210 @@
+/* ui-shared.c: common web output functions
+ *
+ * Copyright (C) 2006-2017 cgit Development Team <cgit@lists.zx2c4.com>
+ *
+ * Licensed under GNU General Public License v2
+ *   (see COPYING for full license text)
+ */
+
+#include "cgit.h"
+#include "ui-shared.h"
+#include "cmd.h"
+#include "html.h"
+#include "version.h"
+
+static const char cgit_doctype[] =
+"<!DOCTYPE html>\n";
+
+static char *http_date(time_t t)
+{
+	static char day[][4] =
+		{"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
+	static char month[][4] =
+		{"Jan", "Feb", "Mar", "Apr", "May", "Jun",
+		 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
+	struct tm *tm = gmtime(&t);
+	return fmt("%s, %02d %s %04d %02d:%02d:%02d GMT", day[tm->tm_wday],
+		   tm->tm_mday, month[tm->tm_mon], 1900 + tm->tm_year,
+		   tm->tm_hour, tm->tm_min, tm->tm_sec);
+}
+
+void cgit_print_error(const char *fmt, ...)
+{
+	va_list ap;
+	va_start(ap, fmt);
+	cgit_vprint_error(fmt, ap);
+	va_end(ap);
+}
+
+void cgit_vprint_error(const char *fmt, va_list ap)
+{
+	va_list cp;
+	html("<div class='error'>");
+	va_copy(cp, ap);
+	html_vtxtf(fmt, cp);
+	va_end(cp);
+	html("</div>\n");
+}
+
+const char *cgit_httpscheme(void)
+{
+	if (ctx.env.https && !strcmp(ctx.env.https, "on"))
+		return "https://";
+	else
+		return "http://";
+}
+
+char *cgit_hosturl(void)
+{
+	if (ctx.env.http_host)
+		return xstrdup(ctx.env.http_host);
+	if (!ctx.env.server_name)
+		return NULL;
+	if (!ctx.env.server_port || atoi(ctx.env.server_port) == 80)
+		return xstrdup(ctx.env.server_name);
+	return fmtalloc("%s:%s", ctx.env.server_name, ctx.env.server_port);
+}
+
+char *cgit_currenturl(void)
+{
+	const char *root = cgit_rooturl();
+
+	if (!ctx.qry.url)
+		return xstrdup(root);
+	if (root[0] && root[strlen(root) - 1] == '/')
+		return fmtalloc("%s%s", root, ctx.qry.url);
+	return fmtalloc("%s/%s", root, ctx.qry.url);
+}
+
+char *cgit_currentfullurl(void)
+{
+	const char *root = cgit_rooturl();
+	const char *orig_query = ctx.env.query_string ? ctx.env.query_string : "";
+	size_t len = strlen(orig_query);
+	char *query = xmalloc(len + 2), *start_url, *ret;
+
+	/* Remove all url=... parts from query string */
+	memcpy(query + 1, orig_query, len + 1);
+	query[0] = '?';
+	start_url = query;
+	while ((start_url = strstr(start_url, "url=")) != NULL) {
+		if (start_url[-1] == '?' || start_url[-1] == '&') {
+			const char *end_url = strchr(start_url, '&');
+			if (end_url)
+				memmove(start_url, end_url + 1, strlen(end_url));
+			else
+				start_url[0] = '\0';
+		} else
+			++start_url;
+	}
+	if (!query[1])
+		query[0] = '\0';
+
+	if (!ctx.qry.url)
+		ret = fmtalloc("%s%s", root, query);
+	else if (root[0] && root[strlen(root) - 1] == '/')
+		ret = fmtalloc("%s%s%s", root, ctx.qry.url, query);
+	else
+		ret = fmtalloc("%s/%s%s", root, ctx.qry.url, query);
+	free(query);
+	return ret;
+}
+
+const char *cgit_rooturl(void)
+{
+	if (ctx.cfg.virtual_root)
+		return ctx.cfg.virtual_root;
+	else
+		return ctx.cfg.script_name;
+}
+
+const char *cgit_loginurl(void)
+{
+	static const char *login_url;
+	if (!login_url)
+		login_url = fmtalloc("%s?p=login", cgit_rooturl());
+	return login_url;
+}
+
+char *cgit_repourl(const char *reponame)
+{
+	if (ctx.cfg.virtual_root)
+		return fmtalloc("%s%s/", ctx.cfg.virtual_root, reponame);
+	else
+		return fmtalloc("?r=%s", reponame);
+}
+
+char *cgit_fileurl(const char *reponame, const char *pagename,
+		   const char *filename, const char *query)
+{
+	struct strbuf sb = STRBUF_INIT;
+	char *delim;
+
+	if (ctx.cfg.virtual_root) {
+		strbuf_addf(&sb, "%s%s/%s/%s", ctx.cfg.virtual_root, reponame,
+			    pagename, (filename ? filename:""));
+		delim = "?";
+	} else {
+		strbuf_addf(&sb, "?url=%s/%s/%s", reponame, pagename,
+			    (filename ? filename : ""));
+		delim = "&amp;";
+	}
+	if (query)
+		strbuf_addf(&sb, "%s%s", delim, query);
+	return strbuf_detach(&sb, NULL);
+}
+
+char *cgit_pageurl(const char *reponame, const char *pagename,
+		   const char *query)
+{
+	return cgit_fileurl(reponame, pagename, NULL, query);
+}
+
+const char *cgit_repobasename(const char *reponame)
+{
+	/* I assume we don't need to store more than one repo basename */
+	static char rvbuf[1024];
+	int p;
+	const char *rv;
+	size_t len;
+
+	len = strlcpy(rvbuf, reponame, sizeof(rvbuf));
+	if (len >= sizeof(rvbuf))
+		die("cgit_repobasename: truncated repository name '%s'", reponame);
+	p = len - 1;
+	/* strip trailing slashes */
+	while (p && rvbuf[p] == '/')
+		rvbuf[p--] = '\0';
+	/* strip trailing .git */
+	if (p >= 3 && starts_with(&rvbuf[p-3], ".git")) {
+		p -= 3;
+		rvbuf[p--] = '\0';
+	}
+	/* strip more trailing slashes if any */
+	while (p && rvbuf[p] == '/')
+		rvbuf[p--] = '\0';
+	/* find last slash in the remaining string */
+	rv = strrchr(rvbuf, '/');
+	if (rv)
+		return ++rv;
+	return rvbuf;
+}
+
+const char *cgit_snapshot_prefix(const struct cgit_repo *repo)
+{
+	if (repo->snapshot_prefix)
+		return repo->snapshot_prefix;
+
+	return cgit_repobasename(repo->url);
+}
+
+static void site_url(const char *page, const char *search, const char *sort, int ofs, int always_root)
+{
+	char *delim = "?";
+
+	if (always_root || page)
+		html_attr(cgit_rooturl());
+	else {
+		char *currenturl = cgit_currenturl();
+		html_attr(currenturl);
+		free(currenturl);
+	}
+
+	if (page) {
+		htmlf("?p=%s", page);
+		delim = "&amp;";
+	}
+	if (search) {
+		html(delim);
+		html("q=");
+		html_attr(search);
+		delim = "&amp;";
+	}
+	if (sort) {
+		html(delim);
+		html("s=");
+		html_attr(sort);
+		delim = "&amp;";
+	}
+	if (ofs) {
+		html(delim);
+		htmlf("ofs=%d", ofs);
+	}
+}
+
+static void site_link(const char *page, const char *name, const char *title,
+		      const char *class, const char *search, const char *sort, int ofs, int always_root)
+{
+	html("<a");
+	if (title) {
+		html(" title='");
+		html_attr(title);
+		html("'");
+	}
+	if (class) {
+		html(" class='");
+		html_attr(class);
+		html("'");
+	}
+	html(" href='");
+	site_url(page, search, sort, ofs, always_root);
+	html("'>");
+	html_txt(name);
+	html("</a>");
+}
+
+void cgit_index_link(const char *name, const char *title, const char *class,
+		     const char *pattern, const char *sort, int ofs, int always_root)
+{
+	site_link(NULL, name, title, class, pattern, sort, ofs, always_root);
+}
+
+static char *repolink(const char *title, const char *class, const char *page,
+		      const char *head, const char *path)
+{
+	char *delim = "?";
+
+	html("<a");
+	if (title) {
+		html(" title='");
+		html_attr(title);
+		html("'");
+	}
+	if (class) {
+		html(" class='");
+		html_attr(class);
+		html("'");
+	}
+	html(" href='");
+	if (ctx.cfg.virtual_root) {
+		html_url_path(ctx.cfg.virtual_root);
+		html_url_path(ctx.repo->url);
+		if (ctx.repo->url[strlen(ctx.repo->url) - 1] != '/')
+			html("/");
+		if (page) {
+			html_url_path(page);
+			html("/");
+			if (path)
+				html_url_path(path);
+		}
+	} else {
+		html_url_path(ctx.cfg.script_name);
+		html("?url=");
+		html_url_arg(ctx.repo->url);
+		if (ctx.repo->url[strlen(ctx.repo->url) - 1] != '/')
+			html("/");
+		if (page) {
+			html_url_arg(page);
+			html("/");
+			if (path)
+				html_url_arg(path);
+		}
+		delim = "&amp;";
+	}
+	if (head && ctx.repo->defbranch && strcmp(head, ctx.repo->defbranch)) {
+		html(delim);
+		html("h=");
+		html_url_arg(head);
+		delim = "&amp;";
+	}
+	return fmt("%s", delim);
+}
+
+static void reporevlink(const char *page, const char *name, const char *title,
+			const char *class, const char *head, const char *rev,
+			const char *path)
+{
+	char *delim;
+
+	delim = repolink(title, class, page, head, path);
+	if (rev && ctx.qry.head != NULL && strcmp(rev, ctx.qry.head)) {
+		html(delim);
+		html("id=");
+		html_url_arg(rev);
+	}
+	html("'>");
+	html_txt(name);
+	html("</a>");
+}
+
+void cgit_summary_link(const char *name, const char *title, const char *class,
+		       const char *head)
+{
+	reporevlink(NULL, name, title, class, head, NULL, NULL);
+}
+
+void cgit_tag_link(const char *name, const char *title, const char *class,
+		   const char *tag)
+{
+	reporevlink("tag", name, title, class, tag, NULL, NULL);
+}
+
+void cgit_tree_link(const char *name, const char *title, const char *class,
+		    const char *head, const char *rev, const char *path)
+{
+	reporevlink("tree", name, title, class, head, rev, path);
+}
+
+void cgit_plain_link(const char *name, const char *title, const char *class,
+		     const char *head, const char *rev, const char *path)
+{
+	reporevlink("plain", name, title, class, head, rev, path);
+}
+
+void cgit_blame_link(const char *name, const char *title, const char *class,
+		     const char *head, const char *rev, const char *path)
+{
+	reporevlink("blame", name, title, class, head, rev, path);
+}
+
+void cgit_log_link(const char *name, const char *title, const char *class,
+		   const char *head, const char *rev, const char *path,
+		   int ofs, const char *grep, const char *pattern, int showmsg,
+		   int follow)
+{
+	char *delim;
+
+	delim = repolink(title, class, "log", head, path);
+	if (rev && ctx.qry.head && strcmp(rev, ctx.qry.head)) {
+		html(delim);
+		html("id=");
+		html_url_arg(rev);
+		delim = "&amp;";
+	}
+	if (grep && pattern) {
+		html(delim);
+		html("qt=");
+		html_url_arg(grep);
+		delim = "&amp;";
+		html(delim);
+		html("q=");
+		html_url_arg(pattern);
+	}
+	if (ofs > 0) {
+		html(delim);
+		html("ofs=");
+		htmlf("%d", ofs);
+		delim = "&amp;";
+	}
+	if (showmsg) {
+		html(delim);
+		html("showmsg=1");
+		delim = "&amp;";
+	}
+	if (follow) {
+		html(delim);
+		html("follow=1");
+	}
+	html("'>");
+	html_txt(name);
+	html("</a>");
+}
+
+void cgit_commit_link(const char *name, const char *title, const char *class,
+		      const char *head, const char *rev, const char *path)
+{
+	char *delim;
+
+	delim = repolink(title, class, "commit", head, path);
+	if (rev && ctx.qry.head && strcmp(rev, ctx.qry.head)) {
+		html(delim);
+		html("id=");
+		html_url_arg(rev);
+		delim = "&amp;";
+	}
+	if (ctx.qry.difftype) {
+		html(delim);
+		htmlf("dt=%d", ctx.qry.difftype);
+		delim = "&amp;";
+	}
+	if (ctx.qry.context > 0 && ctx.qry.context != 3) {
+		html(delim);
+		html("context=");
+		htmlf("%d", ctx.qry.context);
+		delim = "&amp;";
+	}
+	if (ctx.qry.ignorews) {
+		html(delim);
+		html("ignorews=1");
+		delim = "&amp;";
+	}
+	if (ctx.qry.follow) {
+		html(delim);
+		html("follow=1");
+	}
+	html("'>");
+	if (name[0] != '\0') {
+		if (strlen(name) > ctx.cfg.max_msg_len && ctx.cfg.max_msg_len >= 15) {
+			html_ntxt(name, ctx.cfg.max_msg_len - 3);
+			html("...");
+		} else
+			html_txt(name);
+	} else
+		html_txt("(no commit message)");
+	html("</a>");
+}
+
+void cgit_refs_link(const char *name, const char *title, const char *class,
+		    const char *head, const char *rev, const char *path)
+{
+	reporevlink("refs", name, title, class, head, rev, path);
+}
+
+void cgit_snapshot_link(const char *name, const char *title, const char *class,
+			const char *head, const char *rev,
+			const char *archivename)
+{
+	reporevlink("snapshot", name, title, class, head, rev, archivename);
+}
+
+void cgit_diff_link(const char *name, const char *title, const char *class,
+		    const char *head, const char *new_rev, const char *old_rev,
+		    const char *path)
+{
+	char *delim;
+
+	delim = repolink(title, class, "diff", head, path);
+	if (new_rev && ctx.qry.head != NULL && strcmp(new_rev, ctx.qry.head)) {
+		html(delim);
+		html("id=");
+		html_url_arg(new_rev);
+		delim = "&amp;";
+	}
+	if (old_rev) {
+		html(delim);
+		html("id2=");
+		html_url_arg(old_rev);
+		delim = "&amp;";
+	}
+	if (ctx.qry.difftype) {
+		html(delim);
+		htmlf("dt=%d", ctx.qry.difftype);
+		delim = "&amp;";
+	}
+	if (ctx.qry.context > 0 && ctx.qry.context != 3) {
+		html(delim);
+		html("context=");
+		htmlf("%d", ctx.qry.context);
+		delim = "&amp;";
+	}
+	if (ctx.qry.ignorews) {
+		html(delim);
+		html("ignorews=1");
+		delim = "&amp;";
+	}
+	if (ctx.qry.follow) {
+		html(delim);
+		html("follow=1");
+	}
+	html("'>");
+	html_txt(name);
+	html("</a>");
+}
+
+void cgit_patch_link(const char *name, const char *title, const char *class,
+		     const char *head, const char *rev, const char *path)
+{
+	reporevlink("patch", name, title, class, head, rev, path);
+}
+
+void cgit_stats_link(const char *name, const char *title, const char *class,
+		     const char *head, const char *path)
+{
+	reporevlink("stats", name, title, class, head, NULL, path);
+}
+
+static void cgit_self_link(char *name, const char *title, const char *class)
+{
+	if (!strcmp(ctx.qry.page, "repolist"))
+		cgit_index_link(name, title, class, ctx.qry.search, ctx.qry.sort,
+				ctx.qry.ofs, 1);
+	else if (!strcmp(ctx.qry.page, "summary"))
+		cgit_summary_link(name, title, class, ctx.qry.head);
+	else if (!strcmp(ctx.qry.page, "tag"))
+		cgit_tag_link(name, title, class, ctx.qry.has_sha1 ?
+			       ctx.qry.sha1 : ctx.qry.head);
+	else if (!strcmp(ctx.qry.page, "tree"))
+		cgit_tree_link(name, title, class, ctx.qry.head,
+			       ctx.qry.has_sha1 ? ctx.qry.sha1 : NULL,
+			       ctx.qry.path);
+	else if (!strcmp(ctx.qry.page, "plain"))
+		cgit_plain_link(name, title, class, ctx.qry.head,
+				ctx.qry.has_sha1 ? ctx.qry.sha1 : NULL,
+				ctx.qry.path);
+	else if (!strcmp(ctx.qry.page, "blame"))
+		cgit_blame_link(name, title, class, ctx.qry.head,
+				ctx.qry.has_sha1 ? ctx.qry.sha1 : NULL,
+				ctx.qry.path);
+	else if (!strcmp(ctx.qry.page, "log"))
+		cgit_log_link(name, title, class, ctx.qry.head,
+			      ctx.qry.has_sha1 ? ctx.qry.sha1 : NULL,
+			      ctx.qry.path, ctx.qry.ofs,
+			      ctx.qry.grep, ctx.qry.search,
+			      ctx.qry.showmsg, ctx.qry.follow);
+	else if (!strcmp(ctx.qry.page, "commit"))
+		cgit_commit_link(name, title, class, ctx.qry.head,
+				 ctx.qry.has_sha1 ? ctx.qry.sha1 : NULL,
+				 ctx.qry.path);
+	else if (!strcmp(ctx.qry.page, "patch"))
+		cgit_patch_link(name, title, class, ctx.qry.head,
+				ctx.qry.has_sha1 ? ctx.qry.sha1 : NULL,
+				ctx.qry.path);
+	else if (!strcmp(ctx.qry.page, "refs"))
+		cgit_refs_link(name, title, class, ctx.qry.head,
+			       ctx.qry.has_sha1 ? ctx.qry.sha1 : NULL,
+			       ctx.qry.path);
+	else if (!strcmp(ctx.qry.page, "snapshot"))
+		cgit_snapshot_link(name, title, class, ctx.qry.head,
+				   ctx.qry.has_sha1 ? ctx.qry.sha1 : NULL,
+				   ctx.qry.path);
+	else if (!strcmp(ctx.qry.page, "diff"))
+		cgit_diff_link(name, title, class, ctx.qry.head,
+			       ctx.qry.sha1, ctx.qry.sha2,
+			       ctx.qry.path);
+	else if (!strcmp(ctx.qry.page, "stats"))
+		cgit_stats_link(name, title, class, ctx.qry.head,
+				ctx.qry.path);
+	else {
+		/* Don't known how to make link for this page */
+		repolink(title, class, ctx.qry.page, ctx.qry.head, ctx.qry.path);
+		html("><!-- cgit_self_link() doesn't know how to make link for page '");
+		html_txt(ctx.qry.page);
+		html("' -->");
+		html_txt(name);
+		html("</a>");
+	}
+}
+
+void cgit_object_link(struct object *obj)
+{
+	char *page, *shortrev, *fullrev, *name;
+
+	fullrev = oid_to_hex(&obj->oid);
+	shortrev = xstrdup(fullrev);
+	shortrev[10] = '\0';
+	if (obj->type == OBJ_COMMIT) {
+		cgit_commit_link(fmt("commit %s...", shortrev), NULL, NULL,
+				 ctx.qry.head, fullrev, NULL);
+		return;
+	} else if (obj->type == OBJ_TREE)
+		page = "tree";
+	else if (obj->type == OBJ_TAG)
+		page = "tag";
+	else
+		page = "blob";
+	name = fmt("%s %s...", type_name(obj->type), shortrev);
+	reporevlink(page, name, NULL, NULL, ctx.qry.head, fullrev, NULL);
+}
+
+static struct string_list_item *lookup_path(struct string_list *list,
+					    const char *path)
+{
+	struct string_list_item *item;
+
+	while (path && path[0]) {
+		if ((item = string_list_lookup(list, path)))
+			return item;
+		if (!(path = strchr(path, '/')))
+			break;
+		path++;
+	}
+	return NULL;
+}
+
+void cgit_submodule_link(const char *class, char *path, const char *rev)
+{
+	struct string_list *list;
+	struct string_list_item *item;
+	char tail, *dir;
+	size_t len;
+
+	len = 0;
+	tail = 0;
+	list = &ctx.repo->submodules;
+	item = lookup_path(list, path);
+	if (!item) {
+		len = strlen(path);
+		tail = path[len - 1];
+		if (tail == '/') {
+			path[len - 1] = 0;
+			item = lookup_path(list, path);
+		}
+	}
+	if (item || ctx.repo->module_link) {
+		html("<a ");
+		if (class)
+			htmlf("class='%s' ", class);
+		html("href='");
+		if (item) {
+			html_attrf(item->util, rev);
+		} else {
+			dir = strrchr(path, '/');
+			if (dir)
+				dir++;
+			else
+				dir = path;
+			html_attrf(ctx.repo->module_link, dir, rev);
+		}
+		html("'>");
+		html_txt(path);
+		html("</a>");
+	} else {
+		html("<span");
+		if (class)
+			htmlf(" class='%s'", class);
+		html(">");
+		html_txt(path);
+		html("</span>");
+	}
+	html_txtf(" @ %.7s", rev);
+	if (item && tail)
+		path[len - 1] = tail;
+}
+
+const struct date_mode *cgit_date_mode(enum date_mode_type type)
+{
+	static struct date_mode mode;
+	mode.type = type;
+	mode.local = ctx.cfg.local_time;
+	return &mode;
+}
+
+static void print_rel_date(time_t t, int tz, double value,
+	const char *class, const char *suffix)
+{
+	htmlf("<span class='%s' title='", class);
+	html_attr(show_date(t, tz, cgit_date_mode(DATE_ISO8601)));
+	htmlf("'>%.0f %s</span>", value, suffix);
+}
+
+void cgit_print_age(time_t t, int tz, time_t max_relative)
+{
+	time_t now, secs;
+
+	if (!t)
+		return;
+	time(&now);
+	secs = now - t;
+	if (secs < 0)
+		secs = 0;
+
+	if (secs > max_relative && max_relative >= 0) {
+		html("<span title='");
+		html_attr(show_date(t, tz, cgit_date_mode(DATE_ISO8601)));
+		html("'>");
+		html_txt(show_date(t, tz, cgit_date_mode(DATE_SHORT)));
+		html("</span>");
+		return;
+	}
+
+	if (secs < TM_HOUR * 2) {
+		print_rel_date(t, tz, secs * 1.0 / TM_MIN, "age-mins", "min.");
+		return;
+	}
+	if (secs < TM_DAY * 2) {
+		print_rel_date(t, tz, secs * 1.0 / TM_HOUR, "age-hours", "hours");
+		return;
+	}
+	if (secs < TM_WEEK * 2) {
+		print_rel_date(t, tz, secs * 1.0 / TM_DAY, "age-days", "days");
+		return;
+	}
+	if (secs < TM_MONTH * 2) {
+		print_rel_date(t, tz, secs * 1.0 / TM_WEEK, "age-weeks", "weeks");
+		return;
+	}
+	if (secs < TM_YEAR * 2) {
+		print_rel_date(t, tz, secs * 1.0 / TM_MONTH, "age-months", "months");
+		return;
+	}
+	print_rel_date(t, tz, secs * 1.0 / TM_YEAR, "age-years", "years");
+}
+
+void cgit_print_http_headers(void)
+{
+	if (ctx.env.no_http && !strcmp(ctx.env.no_http, "1"))
+		return;
+
+	if (ctx.page.status)
+		htmlf("Status: %d %s\n", ctx.page.status, ctx.page.statusmsg);
+	if (ctx.page.mimetype && ctx.page.charset)
+		htmlf("Content-Type: %s; charset=%s\n", ctx.page.mimetype,
+		      ctx.page.charset);
+	else if (ctx.page.mimetype)
+		htmlf("Content-Type: %s\n", ctx.page.mimetype);
+	if (ctx.page.size)
+		htmlf("Content-Length: %zd\n", ctx.page.size);
+	if (ctx.page.filename) {
+		html("Content-Disposition: inline; filename=\"");
+		html_header_arg_in_quotes(ctx.page.filename);
+		html("\"\n");
+	}
+	if (!ctx.env.authenticated)
+		html("Cache-Control: no-cache, no-store\n");
+	htmlf("Last-Modified: %s\n", http_date(ctx.page.modified));
+	htmlf("Expires: %s\n", http_date(ctx.page.expires));
+	if (ctx.page.etag)
+		htmlf("ETag: \"%s\"\n", ctx.page.etag);
+	html("\n");
+	if (ctx.env.request_method && !strcmp(ctx.env.request_method, "HEAD"))
+		exit(0);
+}
+
+void cgit_redirect(const char *url, bool permanent)
+{
+	htmlf("Status: %d %s\n", permanent ? 301 : 302, permanent ? "Moved" : "Found");
+	html("Location: ");
+	html_url_path(url);
+	html("\n\n");
+}
+
+static void print_rel_vcs_link(const char *url)
+{
+	html("<link rel='vcs-git' href='");
+	html_attr(url);
+	html("' title='");
+	html_attr(ctx.repo->name);
+	html(" Git repository'/>\n");
+}
+
+void cgit_print_docstart(void)
+{
+	char *host = cgit_hosturl();
+
+	if (ctx.cfg.embedded) {
+		if (ctx.cfg.header)
+			html_include(ctx.cfg.header);
+		return;
+	}
+
+	html(cgit_doctype);
+	html("<html lang='en'>\n");
+	html("<head>\n");
+	html("<title>");
+	html_txt(ctx.page.title);
+	html("</title>\n");
+	htmlf("<meta name='generator' content='cgit %s'/>\n", cgit_version);
+	if (ctx.cfg.robots && *ctx.cfg.robots)
+		htmlf("<meta name='robots' content='%s'/>\n", ctx.cfg.robots);
+	html("<link rel='stylesheet' type='text/css' href='");
+	html_attr(ctx.cfg.css);
+	html("'/>\n");
+	if (ctx.cfg.favicon) {
+		html("<link rel='shortcut icon' href='");
+		html_attr(ctx.cfg.favicon);
+		html("'/>\n");
+	}
+	if (host && ctx.repo && ctx.qry.head) {
+		char *fileurl;
+		struct strbuf sb = STRBUF_INIT;
+		strbuf_addf(&sb, "h=%s", ctx.qry.head);
+
+		html("<link rel='alternate' title='Atom feed' href='");
+		html(cgit_httpscheme());
+		html_attr(host);
+		fileurl = cgit_fileurl(ctx.repo->url, "atom", ctx.qry.vpath,
+				       sb.buf);
+		html_attr(fileurl);
+		html("' type='application/atom+xml'/>\n");
+		strbuf_release(&sb);
+		free(fileurl);
+	}
+	if (ctx.repo)
+		cgit_add_clone_urls(print_rel_vcs_link);
+	if (ctx.cfg.head_include)
+		html_include(ctx.cfg.head_include);
+	if (ctx.repo && ctx.repo->extra_head_content)
+		html(ctx.repo->extra_head_content);
+	html("</head>\n");
+	html("<body>\n");
+	if (ctx.cfg.header)
+		html_include(ctx.cfg.header);
+	free(host);
+}
+
+void cgit_print_docend(void)
+{
+	html("</div> <!-- class=content -->\n");
+	if (ctx.cfg.embedded) {
+		html("</div> <!-- id=cgit -->\n");
+		if (ctx.cfg.footer)
+			html_include(ctx.cfg.footer);
+		return;
+	}
+	if (ctx.cfg.footer)
+		html_include(ctx.cfg.footer);
+	else {
+		htmlf("<div class='footer'>generated by <a href='https://git.zx2c4.com/cgit/about/'>cgit %s</a> "
+			"(<a href='https://git-scm.com/'>git %s</a>) at ", cgit_version, git_version_string);
+		html_txt(show_date(time(NULL), 0, cgit_date_mode(DATE_ISO8601)));
+		html("</div>\n");
+	}
+	html("</div> <!-- id=cgit -->\n");
+	html("</body>\n</html>\n");
+}
+
+void cgit_print_error_page(int code, const char *msg, const char *fmt, ...)
+{
+	va_list ap;
+	ctx.page.expires = ctx.cfg.cache_dynamic_ttl;
+	ctx.page.status = code;
+	ctx.page.statusmsg = msg;
+	cgit_print_layout_start();
+	va_start(ap, fmt);
+	cgit_vprint_error(fmt, ap);
+	va_end(ap);
+	cgit_print_layout_end();
+}
+
+void cgit_print_layout_start(void)
+{
+	cgit_print_http_headers();
+	cgit_print_docstart();
+	cgit_print_pageheader();
+}
+
+void cgit_print_layout_end(void)
+{
+	cgit_print_docend();
+}
+
+static void add_clone_urls(void (*fn)(const char *), char *txt, char *suffix)
+{
+	struct strbuf **url_list = strbuf_split_str(txt, ' ', 0);
+	int i;
+
+	for (i = 0; url_list[i]; i++) {
+		strbuf_rtrim(url_list[i]);
+		if (url_list[i]->len == 0)
+			continue;
+		if (suffix && *suffix)
+			strbuf_addf(url_list[i], "/%s", suffix);
+		fn(url_list[i]->buf);
+	}
+
+	strbuf_list_free(url_list);
+}
+
+void cgit_add_clone_urls(void (*fn)(const char *))
+{
+	if (ctx.repo->clone_url)
+		add_clone_urls(fn, expand_macros(ctx.repo->clone_url), NULL);
+	else if (ctx.cfg.clone_prefix)
+		add_clone_urls(fn, ctx.cfg.clone_prefix, ctx.repo->url);
+}
+
+static int print_branch_option(const char *refname, const struct object_id *oid,
+			       int flags, void *cb_data)
+{
+	char *name = (char *)refname;
+	html_option(name, name, ctx.qry.head);
+	return 0;
+}
+
+void cgit_add_hidden_formfields(int incl_head, int incl_search,
+				const char *page)
+{
+	if (!ctx.cfg.virtual_root) {
+		struct strbuf url = STRBUF_INIT;
+
+		strbuf_addf(&url, "%s/%s", ctx.qry.repo, page);
+		if (ctx.qry.vpath)
+			strbuf_addf(&url, "/%s", ctx.qry.vpath);
+		html_hidden("url", url.buf);
+		strbuf_release(&url);
+	}
+
+	if (incl_head && ctx.qry.head && ctx.repo->defbranch &&
+	    strcmp(ctx.qry.head, ctx.repo->defbranch))
+		html_hidden("h", ctx.qry.head);
+
+	if (ctx.qry.sha1)
+		html_hidden("id", ctx.qry.sha1);
+	if (ctx.qry.sha2)
+		html_hidden("id2", ctx.qry.sha2);
+	if (ctx.qry.showmsg)
+		html_hidden("showmsg", "1");
+
+	if (incl_search) {
+		if (ctx.qry.grep)
+			html_hidden("qt", ctx.qry.grep);
+		if (ctx.qry.search)
+			html_hidden("q", ctx.qry.search);
+	}
+}
+
+static const char *hc(const char *page)
+{
+	if (!ctx.qry.page)
+		return NULL;
+
+	return strcmp(ctx.qry.page, page) ? NULL : "active";
+}
+
+static void cgit_print_path_crumbs(char *path)
+{
+	char *old_path = ctx.qry.path;
+	char *p = path, *q, *end = path + strlen(path);
+	int levels = 0;
+
+	ctx.qry.path = NULL;
+	cgit_self_link("root", NULL, NULL);
+	ctx.qry.path = p = path;
+	while (p < end) {
+		if (!(q = strchr(p, '/')) || levels > 15)
+			q = end;
+		*q = '\0';
+		html_txt("/");
+		cgit_self_link(p, NULL, NULL);
+		if (q < end)
+			*q = '/';
+		p = q + 1;
+		++levels;
+	}
+	ctx.qry.path = old_path;
+}
+
+static void print_header(void)
+{
+	char *logo = NULL, *logo_link = NULL;
+
+	html("<table id='header'>\n");
+	html("<tr>\n");
+
+	if (ctx.repo && ctx.repo->logo && *ctx.repo->logo)
+		logo = ctx.repo->logo;
+	else
+		logo = ctx.cfg.logo;
+	if (ctx.repo && ctx.repo->logo_link && *ctx.repo->logo_link)
+		logo_link = ctx.repo->logo_link;
+	else
+		logo_link = ctx.cfg.logo_link;
+	if (logo && *logo) {
+		html("<td class='logo' rowspan='2'><a href='");
+		if (logo_link && *logo_link)
+			html_attr(logo_link);
+		else
+			html_attr(cgit_rooturl());
+		html("'><img src='");
+		html_attr(logo);
+		html("' alt='cgit logo'/></a></td>\n");
+	}
+
+	html("<td class='main'>");
+	if (ctx.repo) {
+		cgit_index_link("index", NULL, NULL, NULL, NULL, 0, 1);
+		html(" : ");
+		cgit_summary_link(ctx.repo->name, ctx.repo->name, NULL, NULL);
+		if (ctx.env.authenticated) {
+			html("</td><td class='form'>");
+			html("<form method='get'>\n");
+			cgit_add_hidden_formfields(0, 1, ctx.qry.page);
+			html("<select name='h' onchange='this.form.submit();'>\n");
+			for_each_branch_ref(print_branch_option, ctx.qry.head);
+			if (ctx.repo->enable_remote_branches)
+				for_each_remote_ref(print_branch_option, ctx.qry.head);
+			html("</select> ");
+			html("<input type='submit' value='switch'/>");
+			html("</form>");
+		}
+	} else
+		html_txt(ctx.cfg.root_title);
+	html("</td></tr>\n");
+
+	html("<tr><td class='sub'>");
+	if (ctx.repo) {
+		html_txt(ctx.repo->desc);
+		html("</td><td class='sub right'>");
+		html_txt(ctx.repo->owner);
+	} else {
+		if (ctx.cfg.root_desc)
+			html_txt(ctx.cfg.root_desc);
+	}
+	html("</td></tr></table>\n");
+}
+
+void cgit_print_pageheader(void)
+{
+	html("<div id='cgit'>");
+	if (!ctx.env.authenticated || !ctx.cfg.noheader)
+		print_header();
+
+	html("<table class='tabs'><tr><td>\n");
+	if (ctx.env.authenticated && ctx.repo) {
+		if (ctx.repo->readme.nr)
+			reporevlink("about", "about", NULL,
+				    hc("about"), ctx.qry.head, NULL,
+				    NULL);
+		cgit_summary_link("summary", NULL, hc("summary"),
+				  ctx.qry.head);
+		cgit_refs_link("refs", NULL, hc("refs"), ctx.qry.head,
+			       ctx.qry.sha1, NULL);
+		cgit_log_link("log", NULL, hc("log"), ctx.qry.head,
+			      NULL, ctx.qry.vpath, 0, NULL, NULL,
+			      ctx.qry.showmsg, ctx.qry.follow);
+		if (ctx.qry.page && !strcmp(ctx.qry.page, "blame"))
+			cgit_blame_link("blame", NULL, hc("blame"), ctx.qry.head,
+				        ctx.qry.sha1, ctx.qry.vpath);
+		else
+			cgit_tree_link("tree", NULL, hc("tree"), ctx.qry.head,
+				       ctx.qry.sha1, ctx.qry.vpath);
+		cgit_commit_link("commit", NULL, hc("commit"),
+				 ctx.qry.head, ctx.qry.sha1, ctx.qry.vpath);
+		cgit_diff_link("diff", NULL, hc("diff"), ctx.qry.head,
+			       ctx.qry.sha1, ctx.qry.sha2, ctx.qry.vpath);
+		if (ctx.repo->max_stats)
+			cgit_stats_link("stats", NULL, hc("stats"),
+					ctx.qry.head, ctx.qry.vpath);
+		if (ctx.repo->homepage) {
+			html("<a href='");
+			html_attr(ctx.repo->homepage);
+			html("'>homepage</a>");
+		}
+		html("</td><td class='form'>");
+		html("<form class='right' method='get' action='");
+		if (ctx.cfg.virtual_root) {
+			char *fileurl = cgit_fileurl(ctx.qry.repo, "log",
+						   ctx.qry.vpath, NULL);
+			html_url_path(fileurl);
+			free(fileurl);
+		}
+		html("'>\n");
+		cgit_add_hidden_formfields(1, 0, "log");
+		html("<select name='qt'>\n");
+		html_option("grep", "log msg", ctx.qry.grep);
+		html_option("author", "author", ctx.qry.grep);
+		html_option("committer", "committer", ctx.qry.grep);
+		html_option("range", "range", ctx.qry.grep);
+		html("</select>\n");
+		html("<input class='txt' type='search' size='10' name='q' value='");
+		html_attr(ctx.qry.search);
+		html("'/>\n");
+		html("<input type='submit' value='search'/>\n");
+		html("</form>\n");
+	} else if (ctx.env.authenticated) {
+		char *currenturl = cgit_currenturl();
+		site_link(NULL, "index", NULL, hc("repolist"), NULL, NULL, 0, 1);
+		if (ctx.cfg.root_readme)
+			site_link("about", "about", NULL, hc("about"),
+				  NULL, NULL, 0, 1);
+		html("</td><td class='form'>");
+		html("<form method='get' action='");
+		html_attr(currenturl);
+		html("'>\n");
+		html("<input type='search' name='q' size='10' value='");
+		html_attr(ctx.qry.search);
+		html("'/>\n");
+		html("<input type='submit' value='search'/>\n");
+		html("</form>");
+		free(currenturl);
+	}
+	html("</td></tr></table>\n");
+	if (ctx.env.authenticated && ctx.repo && ctx.qry.vpath) {
+		html("<div class='path'>");
+		html("path: ");
+		cgit_print_path_crumbs(ctx.qry.vpath);
+		if (ctx.cfg.enable_follow_links && !strcmp(ctx.qry.page, "log")) {
+			html(" (");
+			ctx.qry.follow = !ctx.qry.follow;
+			cgit_self_link(ctx.qry.follow ? "follow" : "unfollow",
+					NULL, NULL);
+			ctx.qry.follow = !ctx.qry.follow;
+			html(")");
+		}
+		html("</div>");
+	}
+	html("<div class='content'>");
+}
+
+void cgit_print_filemode(unsigned short mode)
+{
+	if (S_ISDIR(mode))
+		html("d");
+	else if (S_ISLNK(mode))
+		html("l");
+	else if (S_ISGITLINK(mode))
+		html("m");
+	else
+		html("-");
+	html_fileperm(mode >> 6);
+	html_fileperm(mode >> 3);
+	html_fileperm(mode);
+}
+
+void cgit_compose_snapshot_prefix(struct strbuf *filename, const char *base,
+				  const char *ref)
+{
+	struct object_id oid;
+
+	/*
+	 * Prettify snapshot names by stripping leading "v" or "V" if the tag
+	 * name starts with {v,V}[0-9] and the prettify mapping is injective,
+	 * i.e. each stripped tag can be inverted without ambiguities.
+	 */
+	if (get_oid(fmt("refs/tags/%s", ref), &oid) == 0 &&
+	    (ref[0] == 'v' || ref[0] == 'V') && isdigit(ref[1]) &&
+	    ((get_oid(fmt("refs/tags/%s", ref + 1), &oid) == 0) +
+	     (get_oid(fmt("refs/tags/v%s", ref + 1), &oid) == 0) +
+	     (get_oid(fmt("refs/tags/V%s", ref + 1), &oid) == 0) == 1))
+		ref++;
+
+	strbuf_addf(filename, "%s-%s", base, ref);
+}
+
+void cgit_print_snapshot_links(const struct cgit_repo *repo, const char *ref,
+			       const char *separator)
+{
+	const struct cgit_snapshot_format *f;
+	struct strbuf filename = STRBUF_INIT;
+	const char *basename;
+	size_t prefixlen;
+
+	basename = cgit_snapshot_prefix(repo);
+	if (starts_with(ref, basename))
+		strbuf_addstr(&filename, ref);
+	else
+		cgit_compose_snapshot_prefix(&filename, basename, ref);
+
+	prefixlen = filename.len;
+	for (f = cgit_snapshot_formats; f->suffix; f++) {
+		if (!(repo->snapshots & cgit_snapshot_format_bit(f)))
+			continue;
+		strbuf_setlen(&filename, prefixlen);
+		strbuf_addstr(&filename, f->suffix);
+		cgit_snapshot_link(filename.buf, NULL, NULL, NULL, NULL,
+				   filename.buf);
+		if (cgit_snapshot_get_sig(ref, f)) {
+			strbuf_addstr(&filename, ".asc");
+			html(" (");
+			cgit_snapshot_link("sig", NULL, NULL, NULL, NULL,
+					   filename.buf);
+			html(")");
+		} else if (starts_with(f->suffix, ".tar") && cgit_snapshot_get_sig(ref, &cgit_snapshot_formats[0])) {
+			strbuf_setlen(&filename, strlen(filename.buf) - strlen(f->suffix));
+			strbuf_addstr(&filename, ".tar.asc");
+			html(" (");
+			cgit_snapshot_link("sig", NULL, NULL, NULL, NULL,
+					   filename.buf);
+			html(")");
+		}
+		html(separator);
+	}
+	strbuf_release(&filename);
+}
+
+void cgit_set_title_from_path(const char *path)
+{
+	struct strbuf sb = STRBUF_INIT;
+	const char *slash, *last_slash;
+
+	if (!path)
+		return;
+
+	for (last_slash = path + strlen(path); (slash = memrchr(path, '/', last_slash - path)) != NULL; last_slash = slash) {
+		strbuf_add(&sb, slash + 1, last_slash - slash - 1);
+		strbuf_addstr(&sb, " \xc2\xab ");
+	}
+	strbuf_add(&sb, path, last_slash - path);
+	strbuf_addf(&sb, " - %s", ctx.page.title);
+	ctx.page.title = strbuf_detach(&sb, NULL);
+}