5 files changed, 130 insertions, 33 deletions

diff --git a/Makefile b/Makefile
index ccc7582..ea4d818 100644
--- a/Makefile
+++ b/Makefile
@@ -55,6 +55,7 @@ install: all clean-cache
         mkdir -p $(prefix)
         install cgit $(prefix)/cgit.cgi
         install cgit.css $(prefix)/cgit.css
+        install add.png del.png $(prefix)/
 
 clean-cgit:
         rm -f cgit *.o
diff --git a/add.png b/add.png
new file mode 100644
index 0000000..c550388
--- /dev/null
+++ b/add.png
diff --git a/cgit.css b/cgit.css
index cded981..b736b19 100644
--- a/cgit.css
+++ b/cgit.css
@@ -26,6 +26,13 @@ h3 {
         font-weight: normal;
 }
 
+h4 {
+        margin-top: 1.5em;
+        margin-bottom: 0.1em;
+        font-size: 100%;
+        font-weight: bold;
+}
+
 a {
         color: blue;
         text-decoration: none;
@@ -227,6 +234,12 @@ div.commit-msg {
 table.diffstat {
         border-collapse: collapse;
         margin-top: 1.5em;
+        width: 100%;
+        border: solid 1px #aaa;
+}
+
+table.diffstat tr:hover {
+        background-color: #eee;
 }
 
 table.diffstat th {
@@ -238,8 +251,11 @@ table.diffstat th {
 }
 
 table.diffstat td {
-        padding: 0.1em 1em 0.1em 0.1em;
+        padding: 0.2em 0.2em 0.1em 0.1em;
         font-size: 100%;
+        border: none;
+        border-top: solid 1px #aaa;
+        border-bottom: solid 1px #aaa;
 }
 
 table.diffstat td span.modechange {
@@ -259,7 +275,17 @@ table.diffstat td.upd a {
         color: blue;
 }
 
-table.diffstat td.summary {
+table.diffstat td.graph {
+        width: 75%;
+        vertical-align: center;
+}
+
+table.diffstat td.graph img {
+        border: none;
+        height: 11pt;
+}
+
+div.diffstat-summary {
         color: #888;
         padding-top: 0.5em;
 }
diff --git a/del.png b/del.png
new file mode 100644
index 0000000..5c73e82
--- /dev/null
+++ b/del.png
diff --git a/ui-commit.c b/ui-commit.c
index f1a22d3..ce33cf9 100644
--- a/ui-commit.c
+++ b/ui-commit.c
@@ -8,14 +8,30 @@
 
 #include "cgit.h"
 
-int files = 0;
+int files = 0, slots = 0;
+int total_adds = 0, total_rems = 0, max_changes = 0;
+int lines_added, lines_removed;
 
-void print_filepair(struct diff_filepair *pair)
+struct fileinfo {
+        char status;
+        unsigned char old_sha1[20];
+        unsigned char new_sha1[20];
+        unsigned short old_mode;
+        unsigned short new_mode;
+        char *old_path;
+        char *new_path;
+        unsigned int added;
+        unsigned int removed;
+} *items;
+
+
+void print_fileinfo(struct fileinfo *info)
 {
-        char *query;
+        char *query, *query2;
         char *class;
+        double width;
 
-        switch (pair->status) {
+        switch (info->status) {
         case DIFF_STATUS_ADDED:
                 class = "add";
                 break;
@@ -41,51 +57,98 @@ void print_filepair(struct diff_filepair *pair)
                 class = "stg";
                 break;
         default:
-                die("bug: unhandled diff status %c", pair->status);
+                die("bug: unhandled diff status %c", info->status);
         }
 
         html("<tr>");
         htmlf("<td class='mode'>");
-        if (is_null_sha1(pair->two->sha1)) {
-                html_filemode(pair->one->mode);
+        if (is_null_sha1(info->new_sha1)) {
+                html_filemode(info->old_mode);
         } else {
-                html_filemode(pair->two->mode);
+                html_filemode(info->new_mode);
         }
 
-        if (pair->one->mode != pair->two->mode &&
-            !is_null_sha1(pair->one->sha1) &&
-            !is_null_sha1(pair->two->sha1)) {
+        if (info->old_mode != info->new_mode &&
+            !is_null_sha1(info->old_sha1) &&
+            !is_null_sha1(info->new_sha1)) {
                 html("<span class='modechange'>[");
-                html_filemode(pair->one->mode);
+                html_filemode(info->old_mode);
                 html("]</span>");
         }
         htmlf("</td><td class='%s'>", class);
-        query = fmt("id=%s&id2=%s", sha1_to_hex(pair->one->sha1),
-                    sha1_to_hex(pair->two->sha1));
+        query = fmt("id=%s&id2=%s", sha1_to_hex(info->old_sha1),
+                    sha1_to_hex(info->new_sha1));
         html_link_open(cgit_pageurl(cgit_query_repo, "diff", query),
                        NULL, NULL);
-        if (pair->status == DIFF_STATUS_COPIED ||
-            pair->status == DIFF_STATUS_RENAMED) {
-                html_txt(pair->two->path);
-                htmlf("</a> (%s from ", pair->status == DIFF_STATUS_COPIED ?
+        if (info->status == DIFF_STATUS_COPIED ||
+            info->status == DIFF_STATUS_RENAMED) {
+                html_txt(info->new_path);
+                htmlf("</a> (%s from ", info->status == DIFF_STATUS_COPIED ?
                       "copied" : "renamed");
-                query = fmt("id=%s", sha1_to_hex(pair->one->sha1));
-                html_link_open(cgit_pageurl(cgit_query_repo, "view", query),
+                query2 = fmt("id=%s", sha1_to_hex(info->old_sha1));
+                html_link_open(cgit_pageurl(cgit_query_repo, "view", query2),
                                NULL, NULL);
-                html_txt(pair->one->path);
+                html_txt(info->old_path);
                 html("</a>)");
         } else {
-                html_txt(pair->two->path);
+                html_txt(info->new_path);
                 html("</a>");
         }
-        html("<td>");
+        html("</td><td class='right'>");
+        htmlf("%d", info->added + info->removed);
 
-        //TODO: diffstat graph
+        html("</td><td class='graph'>");
+        width = (info->added + info->removed) * 100.0 / max_changes;
+        if (width < 0.1)
+                width = 0.1;
+        html_link_open(cgit_pageurl(cgit_query_repo, "diff", query),
+                       NULL, NULL);
+        htmlf("<img src='/cgit/add.png' style='width: %.1f%%;'/>",
+              info->added * width / (info->added + info->removed));
+        htmlf("<img src='/cgit/del.png' style='width: %.1f%%;'/>",
+              info->removed * width / (info->added + info->removed));
+        html("</a></td></tr>\n");
+}
 
-        html("</td></tr>\n");
+void cgit_count_diff_lines(char *line, int len)
+{
+        if (line && (len > 0)) {
+                if (line[0] == '+')
+                        lines_added++;
+                else if (line[0] == '-')
+                        lines_removed++;
+        }
+}
+
+void inspect_filepair(struct diff_filepair *pair)
+{
         files++;
+        lines_added = 0;
+        lines_removed = 0;
+        cgit_diff_files(pair->one->sha1, pair->two->sha1, cgit_count_diff_lines);
+        if (files >= slots) {
+                if (slots == 0)
+                        slots = 4;
+                else
+                        slots = slots * 2;
+                items = xrealloc(items, slots * sizeof(struct fileinfo));
+        }
+        items[files-1].status = pair->status;
+        hashcpy(items[files-1].old_sha1, pair->one->sha1);
+        hashcpy(items[files-1].new_sha1, pair->two->sha1);
+        items[files-1].old_mode = pair->one->mode;
+        items[files-1].new_mode = pair->two->mode;
+        items[files-1].old_path = xstrdup(pair->one->path);
+        items[files-1].new_path = xstrdup(pair->two->path);
+        items[files-1].added = lines_added;
+        items[files-1].removed = lines_removed;
+        if (lines_added + lines_removed > max_changes)
+                max_changes = lines_added + lines_removed;
+        total_adds += lines_added;
+        total_rems += lines_removed;
 }
 
+
 void cgit_print_commit(const char *hex)
 {
         struct commit *commit;
@@ -94,6 +157,7 @@ void cgit_print_commit(const char *hex)
         unsigned char sha1[20];
         char *query;
         char *filename;
+        int i;
 
         if (get_sha1(hex, sha1)) {
                 cgit_print_error(fmt("Bad object id: %s", hex));
@@ -148,11 +212,17 @@ void cgit_print_commit(const char *hex)
         html("<div class='commit-msg'>");
         html_txt(info->msg);
         html("</div>");
-        html("<table class='diffstat'>");
-        html("<tr><th colspan='3'>Affected files</tr>\n");
-        cgit_diff_commit(commit, print_filepair);
-        htmlf("<tr><td colspan='3' class='summary'>"
-              "%d file%s changed</td></tr>\n", files, files > 1 ? "s" : "");
-        html("</table>");
+        if (!(commit->parents && commit->parents->next && commit->parents->next->next)) {
+                html("<table class='diffstat'>");
+                max_changes = 0;
+                cgit_diff_commit(commit, inspect_filepair);
+                for(i = 0; i<files; i++)
+                        print_fileinfo(&items[i]);
+                html("</table>");
+                html("<div class='diffstat-summary'>");
+                htmlf("%d files changed, %d insertions, %d deletions\n",
+                      files, total_adds, total_rems);
+                html("</div>");
+        }
         cgit_free_commitinfo(info);
 }