7 files changed, 270 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index 58a583b..4aa7afe 100644
--- a/Makefile
+++ b/Makefile
@@ -6,7 +6,7 @@ CACHE_ROOT = /var/cache/cgit
 
 EXTLIBS = ../git/libgit.a ../git/xdiff/lib.a -lz -lcrypto
 OBJECTS = shared.o cache.o parsing.o html.o ui-shared.o ui-repolist.o \
-        ui-summary.o ui-log.o ui-view.c ui-tree.c ui-commit.c
+        ui-summary.o ui-log.o ui-view.c ui-tree.c ui-commit.c ui-diff.o
 
 CFLAGS += -Wall
 
diff --git a/cgit.c b/cgit.c
index 372b436..ac43441 100644
--- a/cgit.c
+++ b/cgit.c
@@ -36,6 +36,8 @@ static void cgit_print_repo_page(struct cacheitem *item)
                 cgit_print_commit(cgit_query_sha1);
         } else if (!strcmp(cgit_query_page, "view")) {
                 cgit_print_view(cgit_query_sha1);
+        } else if (!strcmp(cgit_query_page, "diff")) {
+                cgit_print_diff(cgit_query_sha1, cgit_query_sha2);
         }
         cgit_print_docend();
 }
diff --git a/cgit.css b/cgit.css
index 5f01926..7b8e468 100644
--- a/cgit.css
+++ b/cgit.css
@@ -77,12 +77,18 @@ div.error {
         font-weight: bold;
         margin: 1em 2em;
 }
+div.ls-blob, div.ls-dir {
+        font-family: monospace;
+}
 div.ls-dir a {
         font-weight: bold;
 }
 th.filesize, td.filesize {
         text-align: right;
 }
+td.filesize {
+        font-family: monospace;
+}
 td.filemode {
         font-family: monospace;
 }
@@ -154,6 +160,25 @@ table.diffstat td.summary {
         color: #888;
         padding-top: 0.5em;
 }
+
+table.diff td {
+        border: solid 1px black;
+        font-family: monospace;
+        white-space: pre;
+}
+
+table.diff td div.hunk {
+        background: #ccc;
+}
+
+table.diff td div.add {
+        color: green;
+}
+
+table.diff td div.del {
+        color: red;
+}
+
 .sha1 {
         font-family: courier;
         font-size: 90%;
diff --git a/cgit.h b/cgit.h
index 37584d6..bba2d6c 100644
--- a/cgit.h
+++ b/cgit.h
@@ -57,6 +57,7 @@ extern char *cgit_query_repo;
 extern char *cgit_query_page;
 extern char *cgit_query_head;
 extern char *cgit_query_sha1;
+extern char *cgit_query_sha2;
 extern int   cgit_query_ofs;
 
 extern int htmlfd;
@@ -104,5 +105,6 @@ extern void cgit_print_log(const char *tip, int ofs, int cnt);
 extern void cgit_print_view(const char *hex);
 extern void cgit_print_tree(const char *hex);
 extern void cgit_print_commit(const char *hex);
+extern void cgit_print_diff(const char *old_hex, const char *new_hex);
 
 #endif /* CGIT_H */
diff --git a/shared.c b/shared.c
index b576df8..762eb38 100644
--- a/shared.c
+++ b/shared.c
@@ -37,6 +37,7 @@ char *cgit_query_repo   = NULL;
 char *cgit_query_page   = NULL;
 char *cgit_query_head   = NULL;
 char *cgit_query_sha1   = NULL;
+char *cgit_query_sha2   = NULL;
 int   cgit_query_ofs    = 0;
 
 int htmlfd = 0;
@@ -83,6 +84,9 @@ void cgit_querystring_cb(const char *name, const char *value)
         } else if (!strcmp(name, "id")) {
                 cgit_query_sha1 = xstrdup(value);
                 cgit_query_has_sha1 = 1;
+        } else if (!strcmp(name, "id2")) {
+                cgit_query_sha2 = xstrdup(value);
+                cgit_query_has_sha1 = 1;
         } else if (!strcmp(name, "ofs")) {
                 cgit_query_ofs = atoi(value);
         }
diff --git a/ui-diff.c b/ui-diff.c
new file mode 100644
index 0000000..0bd9ade
--- /dev/null
+++ b/ui-diff.c
@@ -0,0 +1,131 @@
+/* ui-diff.c: show diff between two blobs
+ *
+ * Copyright (C) 2006 Lars Hjemli
+ *
+ * Licensed under GNU General Public License v2
+ *   (see COPYING for full license text)
+ */
+
+#include "cgit.h"
+#include "xdiff.h"
+
+char *diff_buffer;
+int diff_buffer_size;
+
+
+/*
+ * print a single line returned from xdiff
+ */
+static void print_line(char *line, int len)
+{
+        char *class = "ctx";
+        char c = line[len-1];
+
+        if (line[0] == '+')
+                class = "add";
+        else if (line[0] == '-')
+                class = "del";
+        else if (line[0] == '@')
+                class = "hunk";
+
+        htmlf("<div class='%s'>", class);
+        line[len-1] = '\0';
+        html_txt(line);
+        html("</div>");
+        line[len-1] = c;
+}
+
+/*
+ * Receive diff-buffers from xdiff and concatenate them as
+ * needed across multiple callbacks.
+ *
+ * This is basically a copy of xdiff-interface.c/xdiff_outf(),
+ * ripped from git and modified to use globals instead of
+ * a special callback-struct.
+ */
+int diff_cb(void *priv_, mmbuffer_t *mb, int nbuf)
+{
+        int i;