18 files changed, 684 insertions, 57 deletions

diff --git a/Makefile b/Makefile
index 7b9ac5f..d39a30e 100644
--- a/Makefile
+++ b/Makefile
@@ -11,6 +11,9 @@ INSTALL = install
 
 # Define NO_STRCASESTR if you don't have strcasestr.
 #
+# Define NO_OPENSSL to disable linking with OpenSSL and use bundled SHA1
+# implementation (slower).
+#
 # Define NEEDS_LIBICONV if linking with libc is not enough (eg. Darwin).
 #
 
@@ -68,7 +71,7 @@ endif
 	$(QUIET_CC)$(CC) -o $*.o -c $(CFLAGS) $<
 
 
-EXTLIBS = git/libgit.a git/xdiff/lib.a -lz -lcrypto
+EXTLIBS = git/libgit.a git/xdiff/lib.a -lz
 OBJECTS =
 OBJECTS += cache.o
 OBJECTS += cgit.o
@@ -90,6 +93,7 @@ OBJECTS += ui-refs.o
 OBJECTS += ui-repolist.o
 OBJECTS += ui-shared.o
 OBJECTS += ui-snapshot.o
+OBJECTS += ui-ssdiff.o
 OBJECTS += ui-stats.o
 OBJECTS += ui-summary.o
 OBJECTS += ui-tag.o
@@ -123,6 +127,12 @@ endif
 ifdef NO_STRCASESTR
 	CFLAGS += -DNO_STRCASESTR
 endif
+ifdef NO_OPENSSL
+	CFLAGS += -DNO_OPENSSL
+	GIT_OPTIONS += NO_OPENSSL=1
+else
+	EXTLIBS += -lcrypto
+endif
 
 cgit: $(OBJECTS) libgit
 	$(QUIET_CC)$(CC) $(CFLAGS) $(LDFLAGS) -o cgit $(OBJECTS) $(EXTLIBS)
@@ -132,8 +142,8 @@ cgit.o: VERSION
 -include $(OBJECTS:.o=.d)
 
 libgit:
-	$(QUIET_SUBDIR0)git $(QUIET_SUBDIR1) NO_CURL=1 libgit.a
-	$(QUIET_SUBDIR0)git $(QUIET_SUBDIR1) NO_CURL=1 xdiff/lib.a
+	$(QUIET_SUBDIR0)git $(QUIET_SUBDIR1) NO_CURL=1 $(GIT_OPTIONS) libgit.a
+	$(QUIET_SUBDIR0)git $(QUIET_SUBDIR1) NO_CURL=1 $(GIT_OPTIONS) xdiff/lib.a
 
 test: all
 	$(QUIET_SUBDIR0)tests $(QUIET_SUBDIR1) all
diff --git a/cgit.c b/cgit.c
index 6c7e811..9305d0a 100644
--- a/cgit.c
+++ b/cgit.c
@@ -60,6 +60,8 @@ void repo_config(struct cgit_repo *repo, const char *name, const char *value)
 		repo->enable_log_filecount = ctx.cfg.enable_log_filecount * atoi(value);
 	else if (!strcmp(name, "enable-log-linecount"))
 		repo->enable_log_linecount = ctx.cfg.enable_log_linecount * atoi(value);
+	else if (!strcmp(name, "enable-remote-branches"))
+		repo->enable_remote_branches = atoi(value);
 	else if (!strcmp(name, "max-stats"))
 		repo->max_stats = cgit_find_stats_period(value, NULL);
 	else if (!strcmp(name, "module-link"))
@@ -137,6 +139,8 @@ void config_cb(const char *name, const char *value)
 		ctx.cfg.enable_log_filecount = atoi(value);
 	else if (!strcmp(name, "enable-log-linecount"))
 		ctx.cfg.enable_log_linecount = atoi(value);
+	else if (!strcmp(name, "enable-remote-branches"))
+		ctx.cfg.enable_remote_branches = atoi(value);
 	else if (!strcmp(name, "enable-tree-linenumbers"))
 		ctx.cfg.enable_tree_linenumbers = atoi(value);
 	else if (!strcmp(name, "max-stats"))
@@ -165,6 +169,8 @@ void config_cb(const char *name, const char *value)
 		ctx.cfg.max_msg_len = atoi(value);
 	else if (!strcmp(name, "max-repodesc-length"))
 		ctx.cfg.max_repodesc_len = atoi(value);
+	else if (!strcmp(name, "max-blob-size"))
+		ctx.cfg.max_blob_size = atoi(value);
 	else if (!strcmp(name, "max-repo-count"))
 		ctx.cfg.max_repo_count = atoi(value);
 	else if (!strcmp(name, "max-commit-count"))
@@ -182,6 +188,8 @@ void config_cb(const char *name, const char *value)
 		ctx.cfg.summary_branches = atoi(value);
 	else if (!strcmp(name, "summary-tags"))
 		ctx.cfg.summary_tags = atoi(value);
+	else if (!strcmp(name, "side-by-side-diffs"))
+		ctx.cfg.ssdiff = atoi(value);
 	else if (!strcmp(name, "agefile"))
 		ctx.cfg.agefile = xstrdup(value);
 	else if (!strcmp(name, "renamelimit"))
@@ -209,6 +217,8 @@ static void querystring_cb(const char *name, const char *value)
 	} else if (!strcmp(name, "p")) {
 		ctx.qry.page = xstrdup(value);
 	} else if (!strcmp(name, "url")) {
+		if (*value == '/')
+			value++;
 		ctx.qry.url = xstrdup(value);
 		cgit_parse_url(value);
 	} else if (!strcmp(name, "qt")) {
@@ -238,6 +248,8 @@ static void querystring_cb(const char *name, const char *value)
 		ctx.qry.showmsg = atoi(value);
 	} else if (!strcmp(name, "period")) {
 		ctx.qry.period = xstrdup(value);
+	} else if (!strcmp(name, "ss")) {
+		ctx.qry.ssdiff = atoi(value);
 	}
 }
 
@@ -268,6 +280,7 @@ static void prepare_context(struct cgit_context *ctx)
 	ctx->cfg.max_lock_attempts = 5;
 	ctx->cfg.max_msg_len = 80;
 	ctx->cfg.max_repodesc_len = 80;
+	ctx->cfg.max_blob_size = 0;
 	ctx->cfg.max_stats = 0;
 	ctx->cfg.module_link = "./?repo=%s&page=commit&id=%s";
 	ctx->cfg.renamelimit = -1;
@@ -279,6 +292,7 @@ static void prepare_context(struct cgit_context *ctx)
 	ctx->cfg.summary_branches = 10;
 	ctx->cfg.summary_log = 10;
 	ctx->cfg.summary_tags = 10;
+	ctx->cfg.ssdiff = 0;
 	ctx->env.cgit_config = xstrdupn(getenv("CGIT_CONFIG"));
 	ctx->env.http_host = xstrdupn(getenv("HTTP_HOST"));
 	ctx->env.https = xstrdupn(getenv("HTTPS"));
diff --git a/cgit.css b/cgit.css
index c47ebc9..0cb894a 100644
--- a/cgit.css
+++ b/cgit.css
@@ -162,6 +162,11 @@ table.list td a {
 	color: black;
 }
 
+table.list td a.ls-dir {
+	font-weight: bold;
+	color: #00f;
+}
+
 table.list td a:hover {
 	color: #00f;
 }
@@ -601,3 +606,102 @@ table.hgraph div.bar {
 	background-color: #eee;
 	height: 1em;
 }
+
+table.ssdiff {
+	width: 100%;
+}
+
+table.ssdiff td {
+	font-size: 75%;
+	font-family: monospace;
+	white-space: pre;
+	padding: 1px 4px 1px 4px;
+	border-left: solid 1px #aaa;
+	border-right: solid 1px #aaa;
+}
+
+table.ssdiff td.add {
+	color: black;
+	background: #cfc;
+	min-width: 50%;
+}
+
+table.ssdiff td.add_dark {
+	color: black;
+	background: #aca;
+	min-width: 50%;
+}
+
+table.ssdiff span.add {
+	background: #cfc;
+	font-weight: bold;
+}
+
+table.ssdiff td.del {
+	color: black;
+	background: #fcc;
+	min-width: 50%;
+}
+
+table.ssdiff td.del_dark {
+	color: black;
+	background: #caa;
+	min-width: 50%;
+}
+
+table.ssdiff span.del {
+	background: #fcc;
+	font-weight: bold;
+}
+
+table.ssdiff td.changed {
+	color: black;
+	background: #ffc;
+	min-width: 50%;
+}
+
+table.ssdiff td.changed_dark {
+	color: black;
+	background: #cca;
+	min-width: 50%;
+}
+
+table.ssdiff td.lineno {
+	color: black;
+	background: #eee;
+	text-align: right;
+	width: 3em;
+	min-width: 3em;
+}
+
+table.ssdiff td.hunk {
+	color: #black;
+	background: #ccf;
+	border-top: solid 1px #aaa;
+	border-bottom: solid 1px #aaa;
+}
+
+table.ssdiff td.head {
+	border-top: solid 1px #aaa;
+	border-bottom: solid 1px #aaa;
+}
+
+table.ssdiff td.head div.head {
+	font-weight: bold;
+	color: black;
+}
+
+table.ssdiff td.foot {
+	border-top: solid 1px #aaa;
+        border-left: none;
+        border-right: none;
+        border-bottom: none;
+}
+
+table.ssdiff td.space {
+	border: none;
+}
+
+table.ssdiff td.space div {
+	min-height: 3em;
+}
\ No newline at end of file
diff --git a/cgit.h b/cgit.h
index 6c6c460..cd4af72 100644
--- a/cgit.h
+++ b/cgit.h
@@ -72,6 +72,7 @@ struct cgit_repo {
 	int snapshots;
 	int enable_log_filecount;
 	int enable_log_linecount;
+	int enable_remote_branches;
 	int max_stats;
 	time_t mtime;
 	struct cgit_filter *about_filter;
@@ -143,6 +144,7 @@ struct cgit_query {
 	int nohead;
 	char *sort;
 	int showmsg;
+	int ssdiff;
 };
 
 struct cgit_config {
@@ -178,6 +180,7 @@ struct cgit_config {
 	int enable_index_links;
 	int enable_log_filecount;
 	int enable_log_linecount;
+	int enable_remote_branches;
 	int enable_tree_linenumbers;
 	int local_time;
 	int max_repo_count;
@@ -185,6 +188,7 @@ struct cgit_config {
 	int max_lock_attempts;
 	int max_msg_len;
 	int max_repodesc_len;
+	int max_blob_size;
 	int max_stats;
 	int nocache;
 	int noplainemail;
@@ -194,6 +198,7 @@ struct cgit_config {
 	int summary_branches;
 	int summary_log;
 	int summary_tags;
+	int ssdiff;
 	struct string_list mimetypes;
 	struct cgit_filter *about_filter;
 	struct cgit_filter *commit_filter;
diff --git a/cgitrc.5.txt b/cgitrc.5.txt
index 0c13485..d74d9e7 100644
--- a/cgitrc.5.txt
+++ b/cgitrc.5.txt
@@ -110,6 +110,11 @@ enable-log-linecount::
 	and removed lines for each commit on the repository log page. Default
 	value: "0".
 
+enable-remote-branches::
+	Flag which, when set to "1", will make cgit display remote branches
+	in the summary and refs views. Default value: "0". See also:
+	"repo.enable-remote-branches".
+
 enable-tree-linenumbers::
 	Flag which, when set to "1", will make cgit generate linenumber links
 	for plaintext blobs printed in the tree view. Default value: "1".
@@ -177,6 +182,10 @@ max-repodesc-length::
 	Specifies the maximum number of repo description characters to display
 	on the repository index page. Default value: "80".
 
+max-blob-size::
+	Specifies the maximum size of a blob to display HTML for in KBytes.
+	Default value: "0" (limit disabled).
+
 max-stats::
 	Set the default maximum statistics period. Valid values are "week",
 	"month", "quarter" and "year". If unspecified, statistics are
@@ -241,6 +250,10 @@ section::
 	after this option will inherit the current section name. Default value:
 	none.
 
+side-by-side-diffs::
+	If set to "1" shows side-by-side diffs instead of unidiffs per
+	default. Default value: "0".
+
 snapshots::
 	Text which specifies the default set of snapshot formats generated by
 	cgit. The value is a space-separated list of zero or more of the
@@ -304,6 +317,10 @@ repo.enable-log-linecount::
 	A flag which can be used to disable the global setting
 	`enable-log-linecount'. Default value: none.
 
+repo.enable-remote-branches::
+	Flag which, when set to "1", will make cgit display remote branches
+	in the summary and refs views. Default value: <enable-remote-branches>.
+
 repo.max-stats::
 	Override the default maximum statistics period. Valid values are equal
 	to the values specified for the global "max-stats" setting. Default
diff --git a/filters/syntax-highlighting.sh b/filters/syntax-highlighting.sh
index 999ad0c..6b1c576 100755
--- a/filters/syntax-highlighting.sh
+++ b/filters/syntax-highlighting.sh
@@ -3,6 +3,10 @@
 # tree-view by refering to this file with the source-filter or repo.source-
 # filter options in cgitrc.
 #
+# This script requires a shell supporting the ${var##pattern} syntax.
+# It is supported by at least dash and bash, however busybox environments
+# might have to use an external call to sed instead.
+#
 # Note: the highlight command (http://www.andre-simon.de/) uses css for syntax
 # highlighting, so you'll probably want something like the following included
 # in your css file (generated by highlight 2.4.8 and adapted for cgit):
@@ -20,20 +24,11 @@
 # table.blob .kwc  { color:#000000; font-weight:bold; }
 # table.blob .kwd  { color:#010181; }
 
-case "$1" in
-	*.c)
-		highlight -f -I -X -S c
-		;;
-	*.h)
-		highlight -f -I -X -S c
-		;;
-	*.sh)
-		highlight -f -I -X -S sh
-		;;
-	*.css)
-		highlight -f -I -X -S css
-		;;
-	*)
-		highlight -f -I -X -S txt
-		;;
-esac
+# store filename and extension in local vars
+BASENAME="$1"
+EXTENSION="${BASENAME##*.}"
+
+# map Makefile and Makefile.* to .mk
+[ "${BASENAME%%.*}" == "Makefile" ] && EXTENSION=mk
+
+exec highlight --force -f -I -X -S $EXTENSION 2>/dev/null
diff --git a/shared.c b/shared.c
index 9362d21..5f46793 100644
--- a/shared.c
+++ b/shared.c
@@ -59,6 +59,7 @@ struct cgit_repo *cgit_add_repo(const char *url)
 	ret->snapshots = ctx.cfg.snapshots;
 	ret->enable_log_filecount = ctx.cfg.enable_log_filecount;
 	ret->enable_log_linecount = ctx.cfg.enable_log_linecount;
+	ret->enable_remote_branches = ctx.cfg.enable_remote_branches;
 	ret->max_stats = ctx.cfg.max_stats;
 	ret->module_link = ctx.cfg.module_link;
 	ret->readme = NULL;
diff --git a/ui-commit.c b/ui-commit.c
index f5b0ae5..b5e3c01 100644
--- a/ui-commit.c
+++ b/ui-commit.c
@@ -58,9 +58,14 @@ void cgit_print_commit(char *hex)
 	html("</td></tr>\n");
 	html("<tr><th>commit</th><td colspan='2' class='sha1'>");
 	tmp = sha1_to_hex(commit->object.sha1);
-	cgit_commit_link(tmp, NULL, NULL, ctx.qry.head, tmp);
+	cgit_commit_link(tmp, NULL, NULL, ctx.qry.head, tmp, 0);
 	html(" (");
 	cgit_patch_link("patch", NULL, NULL, NULL, tmp);
+	html(") (");
+	if ((ctx.qry.ssdiff && !ctx.cfg.ssdiff) || (!ctx.qry.ssdiff && ctx.cfg.ssdiff))
+		cgit_commit_link("unidiff", NULL, NULL, ctx.qry.head, tmp, 1);
+	else
+		cgit_commit_link("side-by-side diff", NULL, NULL, ctx.qry.head, tmp, 1);
 	html(")</td></tr>\n");
 	html("<tr><th>tree</th><td colspan='2' class='sha1'>");
 	tmp = xstrdup(hex);
@@ -78,10 +83,10 @@ void cgit_print_commit(char *hex)
 		html("<tr><th>parent</th>"
 		     "<td colspan='2' class='sha1'>");
 		cgit_commit_link(sha1_to_hex(p->item->object.sha1), NULL, NULL,
-				 ctx.qry.head, sha1_to_hex(p->item->object.sha1));
+				 ctx.qry.head, sha1_to_hex(p->item->object.sha1), 0);
 		html(" (");
 		cgit_diff_link("diff", NULL, NULL, ctx.qry.head, hex,
-			       sha1_to_hex(p->item->object.sha1), NULL);
+			       sha1_to_hex(p->item->object.sha1), NULL, 0);
 		html(")</td></tr>");
 		parents++;
 	}
diff --git a/ui-diff.c b/ui-diff.c
index 2196745..a92a768 100644
--- a/ui-diff.c
+++ b/ui-diff.c
@@ -9,6 +9,7 @@
 #include "cgit.h"
 #include "html.h"
 #include "ui-shared.h"
+#include "ui-ssdiff.h"
 
 unsigned char old_rev_sha1[20];
 unsigned char new_rev_sha1[20];
@@ -32,6 +33,7 @@ static struct fileinfo {
 	int binary:1;
 } *items;
 
+static int use_ssdiff = 0;
 
 static void print_fileinfo(struct fileinfo *info)
 {
@@ -83,7 +85,7 @@ static void print_fileinfo(struct fileinfo *info)
 	}
 	htmlf("</td><td class='%s'>", class);
 	cgit_diff_link(info->new_path, NULL, NULL, ctx.qry.head, ctx.qry.sha1,
-		       ctx.qry.sha2, info->new_path);
+		       ctx.qry.sha2, info->new_path, 0);
 	if (info->status == DIFF_STATUS_COPIED || info->status == DIFF_STATUS_RENAMED)
 		htmlf(" (%s from %s)",
 		      info->status == DIFF_STATUS_COPIED ? "copied" : "renamed",
@@ -158,7 +160,7 @@ void cgit_print_diffstat(const unsigned char *old_sha1,
 
 	html("<div class='diffstat-header'>");
 	cgit_diff_link("Diffstat", NULL, NULL, ctx.qry.head, ctx.qry.sha1,
-		       ctx.qry.sha2, NULL);
+		       ctx.qry.sha2, NULL, 0);
 	html("</div>");
 	html("<table summary='diffstat' class='diffstat'>");
 	max_changes = 0;
@@ -246,26 +248,54 @@ static void header(unsigned char *sha1, char *path1, int mode1,
 	html("</div>");
 }
 
+static void print_ssdiff_link()
+{
+	if (!strcmp(ctx.qry.page, "diff")) {
+		if (use_ssdiff)
+			cgit_diff_link("Unidiff", NULL, NULL, ctx.qry.head,
+				       ctx.qry.sha1, ctx.qry.sha2, ctx.qry.path, 1);
+		else
+			cgit_diff_link("Side-by-side diff", NULL, NULL,
+				       ctx.qry.head, ctx.qry.sha1,
+				       ctx.qry.sha2, ctx.qry.path, 1);
+	}
+}
+
 static void filepair_cb(struct diff_filepair *pair)
 {
 	unsigned long old_size = 0;
 	unsigned long new_size = 0;
 	int binary = 0;
+	linediff_fn print_line_fn = print_line;
 
+	if (use_ssdiff) {
+		cgit_ssdiff_header_begin();
+		print_line_fn = cgit_ssdiff_line_cb;
+	}
 	header(pair->one->sha1, pair->one->path, pair->one->mode,
 	       pair->two->sha1, pair->two->path, pair->two->mode);
+	if (use_ssdiff)
+		cgit_ssdiff_header_end();
 	if (S_ISGITLINK(pair->one->mode) || S_ISGITLINK(pair->two->mode)) {
 		if (S_ISGITLINK(pair->one->mode))
-			print_line(fmt("-Subproject %s", sha1_to_hex(pair->one->sha1)), 52);
+			print_line_fn(fmt("-Subproject %s", sha1_to_hex(pair->one->sha1)), 52);
 		if (S_ISGITLINK(pair->two->mode))
-			print_line(fmt("+Subproject %s", sha1_to_hex(pair->two->sha1)), 52);
+			print_line_fn(fmt("+Subproject %s", sha1_to_hex(pair->two->sha1)), 52);
+		if (use_ssdiff)
+			cgit_ssdiff_footer();
 		return;
 	}
-	if (cgit_diff_files(pair->one->sha1, pair->two->sha1, &old_size, 
-			    &new_size, &binary, print_line))
+	if (cgit_diff_files(pair->one->sha1, pair->two->sha1, &old_size,
+			    &new_size, &binary, print_line_fn))
 		cgit_print_error("Error running diff");
-	if (binary)
-		html("Binary files differ");
+	if (binary) {
+		if (use_ssdiff)
+			html("<tr><td colspan='4'>Binary files differ</td></tr>");
+		else
+			html("Binary files differ");
+	}
+	if (use_ssdiff)
+		cgit_ssdiff_footer();
 }
 
 void cgit_print_diff(const char *new_rev, const char *old_rev, const char *prefix)
@@ -303,11 +333,21 @@ void cgit_print_diff(const char *new_rev, const char *old_rev, const char *prefi
 		if (!commit2 || parse_commit(commit2))
 			cgit_print_error(fmt("Bad commit: %s", sha1_to_hex(old_rev_sha1)));
 	}
+
+	if ((ctx.qry.ssdiff && !ctx.cfg.ssdiff) || (!ctx.qry.ssdiff && ctx.cfg.ssdiff))
+		use_ssdiff = 1;
+
+	print_ssdiff_link();
 	cgit_print_diffstat(old_rev_sha1, new_rev_sha1);
 
-	html("<table summary='diff' class='diff'>");
-	html("<tr><td>");
+	if (use_ssdiff) {
+		html("<table summary='ssdiff' class='ssdiff'>");
+	} else {
+		html("<table summary='diff' class='diff'>");
+		html("<tr><td>");
+	}
 	cgit_diff_tree(old_rev_sha1, new_rev_sha1, filepair_cb, prefix);
-	html("</td></tr>");
+	if (!use_ssdiff)
+		html("</td></tr>");
 	html("</table>");
 }
diff --git a/ui-log.c b/ui-log.c
index f3132c9..0947604 100644
--- a/ui-log.c
+++ b/ui-log.c
@@ -66,7 +66,7 @@ void show_commit_decorations(struct commit *commit)
 		else {
 			strncpy(buf, deco->name, sizeof(buf) - 1);
 			cgit_commit_link(buf, NULL, "deco", ctx.qry.head,
-				sha1_to_hex(commit->object.sha1));
+				sha1_to_hex(commit->object.sha1), 0);
 		}
 		deco = deco->next;
 	}
@@ -89,7 +89,7 @@ void print_commit(struct commit *commit)
 	htmlf("</td><td%s>",
 		ctx.qry.showmsg ? " class='logsubject'" : "");
 	cgit_commit_link(info->subject, NULL, NULL, ctx.qry.head,
-			 sha1_to_hex(commit->object.sha1));
+			 sha1_to_hex(commit->object.sha1), 0);
 	show_commit_decorations(commit);
 	html("</td><td>");
 	html_txt(info->author);
diff --git a/ui-refs.c b/ui-refs.c
index d3b4f6e..98738db 100644
--- a/ui-refs.c
+++ b/ui-refs.c
@@ -74,7 +74,7 @@ static int print_branch(struct refinfo *ref)
 	html("</td><td>");
 
 	if (ref->object->type == OBJ_COMMIT) {
-		cgit_commit_link(info->subject, NULL, NULL, name, NULL);
+		cgit_commit_link(info->subject, NULL, NULL, name, NULL, 0);
 		html("</td><td>");
 		html_txt(info->author);
 		html("</td><td colspan='2'>");
@@ -187,6 +187,8 @@ void cgit_print_branches(int maxcount)
 	list.refs = NULL;
 	list.alloc = list.count = 0;
 	for_each_branch_ref(cgit_refs_cb, &list);
+	if (ctx.repo->enable_remote_branches)
+		for_each_remote_ref(cgit_refs_cb, &list);
 
 	if (maxcount == 0 || maxcount > list.count)
 		maxcount = list.count;
diff --git a/ui-shared.c b/ui-shared.c
index 8a7cc32..8827fff 100644
--- a/ui-shared.c
+++ b/ui-shared.c
@@ -317,7 +317,7 @@ void cgit_log_link(char *name, char *title, char *class, char *head,
 }
 
 void cgit_commit_link(char *name, char *title, char *class, char *head,
-		      char *rev)
+		      char *rev, int toggle_ssdiff)
 {
 	if (strlen(name) > ctx.cfg.max_msg_len && ctx.cfg.max_msg_len >= 15) {
 		name[ctx.cfg.max_msg_len] = '\0';
@@ -325,7 +325,23 @@ void cgit_commit_link(char *name, char *title, char *class, char *head,
 		name[ctx.cfg.max_msg_len - 2] = '.';
 		name[ctx.cfg.max_msg_len - 3] = '.';
 	}
-	reporevlink("commit", name, title, class, head, rev, NULL);
+
+	char *delim;
+
+	delim = repolink(title, class, "commit", head, NULL);
+	if (rev && strcmp(rev, ctx.qry.head)) {
+		html(delim);
+		html("id=");
+		html_url_arg(rev);
+		delim = "&amp;";
+	}
+	if ((ctx.qry.ssdiff && !toggle_ssdiff) || (!ctx.qry.ssdiff && toggle_ssdiff)) {
+		html(delim);
+		html("ss=1");
+	}
+	html("'>");
+	html_txt(name);
+	html("</a>");
 }
 
 void cgit_refs_link(char *name, char *title, char *class, char *head,
@@ -341,7 +357,8 @@ void cgit_snapshot_link(char *name, char *title, char *class, char *head,
 }
 
 void cgit_diff_link(char *name, char *title, char *class, char *head,
-		    char *new_rev, char *old_rev, char *path)
+		    char *new_rev, char *old_rev, char *path,
+		    int toggle_ssdiff)
 {
 	char *delim;
 
@@ -356,6 +373,11 @@ void cgit_diff_link(char *name, char *title, char *class, char *head,
 		html(delim);
 		html("id2=");
 		html_url_arg(old_rev);
+		delim = "&amp;";
+	}
+	if ((ctx.qry.ssdiff && !toggle_ssdiff) || (!ctx.qry.ssdiff && toggle_ssdiff)) {
+		html(delim);
+		html("ss=1");
 	}
 	html("'>");
 	html_txt(name);
@@ -383,7 +405,7 @@ void cgit_object_link(struct object *obj)
 	shortrev[10] = '\0';
 	if (obj->type == OBJ_COMMIT) {
                 cgit_commit_link(fmt("commit %s...", shortrev), NULL, NULL,
-				 ctx.qry.head, fullrev);
+				 ctx.qry.head, fullrev, 0);
 		return;
 	} else if (obj->type == OBJ_TREE)
 		page = "tree";
@@ -695,9 +717,9 @@ void cgit_print_pageheader(struct cgit_context *ctx)
 		cgit_tree_link("tree", NULL, hc(cmd, "tree"), ctx->qry.head,
 			       ctx->qry.sha1, NULL);
 		cgit_commit_link("commit", NULL, hc(cmd, "commit"),
-				 ctx->qry.head, ctx->qry.sha1);
+				 ctx->qry.head, ctx->qry.sha1, 0);
 		cgit_diff_link("diff", NULL, hc(cmd, "diff"), ctx->qry.head,
-			       ctx->qry.sha1, ctx->qry.sha2, NULL);
+			       ctx->qry.sha1, ctx->qry.sha2, NULL, 0);
 		if (ctx->repo->max_stats)
 			cgit_stats_link("stats", NULL, hc(cmd, "stats"),
 					ctx->qry.head, NULL);
@@ -760,13 +782,18 @@ void cgit_print_snapshot_links(const char *repo, const char *head,
 			       const char *hex, int snapshots)
 {
 	const struct cgit_snapshot_format* f;
+	char *prefix;
     	char *filename;
+	unsigned char sha1[20];
 
+	if (get_sha1(fmt("refs/tags/%s", hex), sha1) == 0 &&
+	    (hex[0] == 'v' || hex[0] == 'V') && isdigit(hex[1]))
+		hex++;
+	prefix = xstrdup(fmt("%s-%s", cgit_repobasename(repo), hex));
 	for (f = cgit_snapshot_formats; f->suffix; f++) {
 		if (!(snapshots & f->bit))
 			continue;
-		filename = fmt("%s-%s%s", cgit_repobasename(repo), hex,
-			       f->suffix);
+		filename = fmt("%s%s", prefix, f->suffix);
 		cgit_snapshot_link(filename, NULL, NULL, NULL, NULL, filename);
 		html("<br/>");
 	}
diff --git a/ui-shared.h b/ui-shared.h
index b12aa89..9ebc1f9 100644
--- a/ui-shared.h
+++ b/ui-shared.h
@@ -23,7 +23,7 @@ extern void cgit_log_link(char *name, char *title, char *class, char *head,
 			  char *rev, char *path, int ofs, char *grep,
 			  char *pattern, int showmsg);
 extern void cgit_commit_link(char *name, char *title, char *class, char *head,
-			     char *rev);
+			     char *rev, int toggle_ssdiff);
 extern void cgit_patch_link(char *name, char *title, char *class, char *head,
 			    char *rev);
 extern void cgit_refs_link(char *name, char *title, char *class, char *head,
@@ -31,7 +31,8 @@ extern void cgit_refs_link(char *name, char *title, char *class, char *head,
 extern void cgit_snapshot_link(char *name, char *title, char *class,
 			       char *head, char *rev, char *archivename);
 extern void cgit_diff_link(char *name, char *title, char *class, char *head,
-			   char *new_rev, char *old_rev, char *path);
+			   char *new_rev, char *old_rev, char *path,
+			   int toggle_ssdiff);
 extern void cgit_stats_link(char *name, char *title, char *class, char *head,
 			    char *path);
 extern void cgit_object_link(struct object *obj);
diff --git a/ui-snapshot.c b/ui-snapshot.c
index 4136b3e..1b25dca 100644
--- a/ui-snapshot.c
+++ b/ui-snapshot.c
@@ -35,11 +35,17 @@ static int write_tar_bzip2_archive(struct archiver_args *args)
 	return write_compressed_tar_archive(args,"bzip2");
 }
 
+static int write_tar_xz_archive(struct archiver_args *args)
+{
+	return write_compressed_tar_archive(args,"xz");
+}
+
 const struct cgit_snapshot_format cgit_snapshot_formats[] = {
-	{ ".zip", "application/x-zip", write_zip_archive, 0x1 },
-	{ ".tar.gz", "application/x-gzip", write_tar_gzip_archive, 0x2 },
-	{ ".tar.bz2", "application/x-bzip2", write_tar_bzip2_archive, 0x4 },
-	{ ".tar", "application/x-tar", write_tar_archive, 0x8 },
+	{ ".zip", "application/x-zip", write_zip_archive, 0x01 },
+	{ ".tar.gz", "application/x-gzip", write_tar_gzip_archive, 0x02 },
+	{ ".tar.bz2", "application/x-bzip2", write_tar_bzip2_archive, 0x04 },
+	{ ".tar", "application/x-tar", write_tar_archive, 0x08 },
+	{ ".tar.xz", "application/x-xz", write_tar_xz_archive, 0x10 },
 	{}
 };
 
diff --git a/ui-ssdiff.c b/ui-ssdiff.c
new file mode 100644
index 0000000..408e620
--- /dev/null
+++ b/ui-ssdiff.c
@@ -0,0 +1,369 @@
+#include "cgit.h"
+#include "html.h"
+#include "ui-shared.h"
+
+extern int use_ssdiff;
+
+static int current_old_line, current_new_line;
+
+struct deferred_lines {
+	int line_no;
+	char *line;
+	struct deferred_lines *next;
+};
+
+static struct deferred_lines *deferred_old, *deferred_old_last;
+static struct deferred_lines *deferred_new, *deferred_new_last;
+
+static char *longest_common_subsequence(char *A, char *B)
+{
+	int i, j, ri;
+	int m = strlen(A);
+	int n = strlen(B);
+	int L[m + 1][n + 1];
+	int tmp1, tmp2;
+	int lcs_length;
+	char *result;
+
+	for (i = m; i >= 0; i--) {
+		for (j = n; j >= 0; j--) {
+			if (A[i] == '\0' || B[j] == '\0') {
+				L[i][j] = 0;
+			} else if (A[i] == B[j]) {
+				L[i][j] = 1 + L[i + 1][j + 1];
+			} else {
+				tmp1 = L[i + 1][j];
+				tmp2 = L[i][j + 1];
+				L[i][j] = (tmp1 > tmp2 ? tmp1 : tmp2);
+			}
+		}
+	}
+
+	lcs_length = L[0][0];
+	result = xmalloc(lcs_length + 2);
+	memset(result, 0, sizeof(*result) * (lcs_length + 2));
+
+	ri = 0;
+	i = 0;
+	j = 0;
+	while (i < m && j < n) {
+		if (A[i] == B[j]) {
+			result[ri] = A[i];
+			ri += 1;
+			i += 1;
+			j += 1;
+		} else if (L[i + 1][j] >= L[i][j + 1]) {
+			i += 1;
+		} else {
+			j += 1;
+		}
+	}
+	return result;
+}
+
+static int line_from_hunk(char *line, char type)
+{
+	char *buf1, *buf2;
+	int len;
+
+	buf1 = strchr(line, type);
+	if (buf1 == NULL)
+		return 0;
+	buf1 += 1;
+	buf2 = strchr(buf1, ',');
+	if (buf2 == NULL)
+		return 0;
+	len = buf2 - buf1;
+	buf2 = xmalloc(len + 1);
+	strncpy(buf2, buf1, len);
+	buf2[len] = '\0';
+	int res = atoi(buf2);
+	free(buf2);
+	return res;
+}
+
+static char *replace_tabs(char *line)
+{
+	char *prev_buf = line;
+	char *cur_buf;
+	int linelen = strlen(line);
+	int n_tabs = 0;
+	int i;
+	char *result;
+	char *spaces = "        ";
+
+	if (linelen == 0) {
+		result = xmalloc(1);
+		result[0] = '\0';
+		return result;
+	}
+
+	for (i = 0; i < linelen; i++)
+		if (line[i] == '\t')
+			n_tabs += 1;
+	result = xmalloc(linelen + n_tabs * 8 + 1);
+	result[0] = '\0';
+
+	while (1) {
+		cur_buf = strchr(prev_buf, '\t');
+		if (!cur_buf) {
+			strcat(result, prev_buf);
+			break;
+		} else {
+			strcat(result, " ");
+			strncat(result, spaces, 8 - (strlen(result) % 8));
+			strncat(result, prev_buf, cur_buf - prev_buf);
+		}
+		prev_buf = cur_buf + 1;
+	}
+	return result;
+}
+
+static int calc_deferred_lines(struct deferred_lines *start)
+{
+	struct deferred_lines *item = start;
+	int result = 0;
+	while (item) {
+		result += 1;
+		item = item->next;
+	}
+	return result;
+}
+
+static void deferred_old_add(char *line, int line_no)
+{
+	struct deferred_lines *item = xmalloc(sizeof(struct deferred_lines));
+	item->line = xstrdup(line);
+	item->line_no = line_no;
+	item->next = NULL;
+	if (deferred_old) {
+		deferred_old_last->next = item;
+		deferred_old_last = item;
+	} else {
+		deferred_old = deferred_old_last = item;
+	}
+}
+
+static void deferred_new_add(char *line, int line_no)
+{
+	struct deferred_lines *item = xmalloc(sizeof(struct deferred_lines));
+	item->line = xstrdup(line);
+	item->line_no = line_no;
+	item->next = NULL;
+	if (deferred_new) {
+		deferred_new_last->next = item;
+		deferred_new_last = item;
+	} else {
+		deferred_new = deferred_new_last = item;
+	}
+}
+
+static void print_part_with_lcs(char *class, char *line, char *lcs)
+{
+	int line_len = strlen(line);
+	int i, j;
+	char c[2] = " ";
+	int same = 1;
+
+	j = 0;
+	for (i = 0; i < line_len; i++) {
+		c[0] = line[i];
+		if (same) {
+			if (line[i] == lcs[j])
+				j += 1;
+			else {
+				same = 0;
+				htmlf("<span class='%s'>", class);
+			}
+		} else if (line[i] == lcs[j]) {
+			same = 1;
+			htmlf("</span>");
+			j += 1;
+		}
+		html_txt(c);
+	}
+}
+
+static void print_ssdiff_line(char *class,
+			      int old_line_no,
+			      char *old_line,
+			      int new_line_no,
+			      char *new_line, int individual_chars)
+{
+	char *lcs = NULL;
+	if (old_line)
+		old_line = replace_tabs(old_line + 1);
+	if (new_line)
+		new_line = replace_tabs(new_line + 1);
+	if (individual_chars && old_line && new_line)
+		lcs = longest_common_subsequence(old_line, new_line);
+	html("<tr>");
+	if (old_line_no > 0)
+		htmlf("<td class='lineno'>%d</td><td class='%s'>",
+		      old_line_no, class);
+	else if (old_line)
+		htmlf("<td class='lineno'></td><td class='%s'>", class);
+	else
+		htmlf("<td class='lineno'></td><td class='%s_dark'>", class);
+	if (old_line) {
+		if (lcs)
+			print_part_with_lcs("del", old_line, lcs);
+		else
+			html_txt(old_line);
+	}
+
+	html("</td>");
+	if (new_line_no > 0)
+		htmlf("<td class='lineno'>%d</td><td class='%s'>",
+		      new_line_no, class);
+	else if (new_line)
+		htmlf("<td class='lineno'></td><td class='%s'>", class);
+	else
+		htmlf("<td class='lineno'></td><td class='%s_dark'>", class);
+	if (new_line) {
+		if (lcs)
+			print_part_with_lcs("add", new_line, lcs);
+		else
+			html_txt(new_line);
+	}
+
+	html("</td></tr>");
+	if (lcs)
+		free(lcs);
+	if (new_line)
+		free(new_line);
+	if (old_line)
+		free(old_line);
+}
+
+static void print_deferred_old_lines()
+{
+	struct deferred_lines *iter_old, *tmp;
+	iter_old = deferred_old;
+	while (iter_old) {
+		print_ssdiff_line("del", iter_old->line_no,
+				  iter_old->line, -1, NULL, 0);
+		tmp = iter_old->next;
+		free(iter_old);
+		iter_old = tmp;
+	}
+}
+
+static void print_deferred_new_lines()
+{
+	struct deferred_lines *iter_new, *tmp;
+	iter_new = deferred_new;
+	while (iter_new) {
+		print_ssdiff_line("add", -1, NULL,
+				  iter_new->line_no, iter_new->line, 0);
+		tmp = iter_new->next;
+		free(iter_new);
+		iter_new = tmp;
+	}
+}
+
+static void print_deferred_changed_lines()
+{
+	struct deferred_lines *iter_old, *iter_new, *tmp;
+	int n_old_lines = calc_deferred_lines(deferred_old);
+	int n_new_lines = calc_deferred_lines(deferred_new);
+	int individual_chars = (n_old_lines == n_new_lines ? 1 : 0);
+
+	iter_old = deferred_old;
+	iter_new = deferred_new;
+	while (iter_old || iter_new) {
+		if (iter_old && iter_new)
+			print_ssdiff_line("changed", iter_old->line_no,
+					  iter_old->line,
+					  iter_new->line_no, iter_new->line,
+					  individual_chars);
+		else if (iter_old)
+			print_ssdiff_line("changed", iter_old->line_no,
+					  iter_old->line, -1, NULL, 0);
+		else if (iter_new)
+			print_ssdiff_line("changed", -1, NULL,
+					  iter_new->line_no, iter_new->line, 0);
+		if (iter_old) {
+			tmp = iter_old->next;
+			free(iter_old);
+			iter_old = tmp;
+		}
+
+		if (iter_new) {
+			tmp = iter_new->next;
+			free(iter_new);
+			iter_new = tmp;
+		}
+	}
+}
+
+void cgit_ssdiff_print_deferred_lines()
+{
+	if (!deferred_old && !deferred_new)
+		return;
+	if (deferred_old && !deferred_new)
+		print_deferred_old_lines();
+	else if (!deferred_old && deferred_new)
+		print_deferred_new_lines();
+	else
+		print_deferred_changed_lines();
+	deferred_old = deferred_old_last = NULL;
+	deferred_new = deferred_new_last = NULL;
+}
+
+/*
+ * print a single line returned from xdiff
+ */
+void cgit_ssdiff_line_cb(char *line, int len)
+{
+	char c = line[len - 1];
+	line[len - 1] = '\0';
+	if (line[0] == '@') {
+		current_old_line = line_from_hunk(line, '-');
+		current_new_line = line_from_hunk(line, '+');
+	}
+
+	if (line[0] == ' ') {
+		if (deferred_old || deferred_new)
+			cgit_ssdiff_print_deferred_lines();
+		print_ssdiff_line("ctx", current_old_line, line,
+				  current_new_line, line, 0);
+		current_old_line += 1;
+		current_new_line += 1;
+	} else if (line[0] == '+') {
+		deferred_new_add(line, current_new_line);
+		current_new_line += 1;
+	} else if (line[0] == '-') {
+		deferred_old_add(line, current_old_line);
+		current_old_line += 1;
+	} else if (line[0] == '@') {
+		html("<tr><td colspan='4' class='hunk'>");
+		html_txt(line);
+		html("</td></tr>");
+	} else {
+		html("<tr><td colspan='4' class='ctx'>");
+		html_txt(line);
+		html("</td></tr>");
+	}
+	line[len - 1] = c;
+}
+
+void cgit_ssdiff_header_begin()
+{
+	current_old_line = -1;
+	current_new_line = -1;
+	html("<tr><td class='space' colspan='4'><div></div></td></tr>");
+	html("<tr><td class='head' colspan='4'>");
+}
+
+void cgit_ssdiff_header_end()
+{
+	html("</td><tr>");
+}
+
+void cgit_ssdiff_footer()
+{
+	if (deferred_old || deferred_new)
+		cgit_ssdiff_print_deferred_lines();
+	html("<tr><td class='foot' colspan='4'></td></tr>");
+}
diff --git a/ui-ssdiff.h b/ui-ssdiff.h
new file mode 100644
index 0000000..64b4b12
--- /dev/null
+++ b/ui-ssdiff.h
@@ -0,0 +1,13 @@
+#ifndef UI_SSDIFF_H
+#define UI_SSDIFF_H
+
+extern void cgit_ssdiff_print_deferred_lines();
+
+extern void cgit_ssdiff_line_cb(char *line, int len);
+
+extern void cgit_ssdiff_header_begin();
+extern void cgit_ssdiff_header_end();
+
+extern void cgit_ssdiff_footer();
+
+#endif /* UI_SSDIFF_H */
diff --git a/ui-tag.c b/ui-tag.c
index c2d72af..39e4cb8 100644
--- a/ui-tag.c
+++ b/ui-tag.c
@@ -30,6 +30,14 @@ static void print_tag_content(char *buf)
 	}
 }
 
+void print_download_links(char *revname)
+{
+	html("<tr><th>download</th><td class='sha1'>");
+	cgit_print_snapshot_links(ctx.qry.repo, ctx.qry.head,
+				  revname, ctx.repo->snapshots);
+	html("</td></tr>");
+}
+
 void cgit_print_tag(char *revname)
 {
 	unsigned char sha1[20];
@@ -56,16 +64,16 @@ void cgit_print_tag(char *revname)
 			return;
 		}
 		html("<table class='commit-info'>\n");
-		htmlf("<tr><td>Tag name</td><td>");
+		htmlf("<tr><td>tag name</td><td>");
 		html_txt(revname);
 		htmlf(" (%s)</td></tr>\n", sha1_to_hex(sha1));
 		if (info->tagger_date > 0) {
-			html("<tr><td>Tag date</td><td>");
+			html("<tr><td>tag date</td><td>");
 			cgit_print_date(info->tagger_date, FMT_LONGDATE, ctx.cfg.local_time);
 			html("</td></tr>\n");
 		}
 		if (info->tagger) {
-			html("<tr><td>Tagged by</td><td>");
+			html("<tr><td>tagged by</td><td>");
 			html_txt(info->tagger);
 			if (info->tagger_email && !ctx.cfg.noplainemail) {
 				html(" ");
@@ -73,19 +81,23 @@ void cgit_print_tag(char *revname)
 			}
 			html("</td></tr>\n");
 		}
-		html("<tr><td>Tagged object</td><td>");
+		html("<tr><td>tagged object</td><td class='sha1'>");
 		cgit_object_link(tag->tagged);
 		html("</td></tr>\n");
+		if (ctx.repo->snapshots)
+			print_download_links(revname);
 		html("</table>\n");
 		print_tag_content(info->msg);
 	} else {
 		html("<table class='commit-info'>\n");
-		htmlf("<tr><td>Tag name</td><td>");
+		htmlf("<tr><td>tag name</td><td>");
 		html_txt(revname);
 		html("</td></tr>\n");
-		html("<tr><td>Tagged object</td><td>");
+		html("<tr><td>Tagged object</td><td class='sha1'>");
 		cgit_object_link(obj);
 		html("</td></tr>\n");
+		if (ctx.repo->snapshots)
+			print_download_links(revname);
 		html("</table>\n");
         }
 	return;
diff --git a/ui-tree.c b/ui-tree.c
index a164767..94aff8f 100644
--- a/ui-tree.c
+++ b/ui-tree.c
@@ -107,6 +107,12 @@ static void print_object(const unsigned char *sha1, char *path, const char *base
 		        curr_rev, path);
 	htmlf(")<br/>blob: %s\n", sha1_to_hex(sha1));
 
+	if (ctx.cfg.max_blob_size && size / 1024 > ctx.cfg.max_blob_size) {
+		htmlf("<div class='error'>blob size (%dKB) exceeds display size limit (%dKB).</div>",
+				size / 1024, ctx.cfg.max_blob_size);
+		return;
+	}
+
 	if (buffer_is_binary(buf, size))
 		print_binary_buffer(buf, size);
 	else