Add commitdiff between commit and each of it's parent

A link is added next to each parent of a commit, leading to the new
diff-functionality in ui-diff.c.

Also added support for a path-parameter to filelevel diffs accessed via the
diffstat.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

1 files changed, 15 insertions, 4 deletions

diff --git a/ui-commit.c b/ui-commit.c
index ce33cf9..b3d1c28 100644
--- a/ui-commit.c
+++ b/ui-commit.c
@@ -67,26 +67,26 @@ void print_fileinfo(struct fileinfo *info)
         } else {
                 html_filemode(info->new_mode);
         }
 
         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(info->old_mode);
                 html("]</span>");
         }
         htmlf("</td><td class='%s'>", class);
-        query = fmt("id=%s&id2=%s", sha1_to_hex(info->old_sha1),
-                    sha1_to_hex(info->new_sha1));
+        query = fmt("id=%s&id2=%s&path=%s", sha1_to_hex(info->old_sha1),
+                    sha1_to_hex(info->new_sha1), info->new_path);
         html_link_open(cgit_pageurl(cgit_query_repo, "diff", query),
                        NULL, NULL);
         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");
                 query2 = fmt("id=%s", sha1_to_hex(info->old_sha1));
                 html_link_open(cgit_pageurl(cgit_query_repo, "view", query2),
                                NULL, NULL);
                 html_txt(info->old_path);
                 html("</a>)");
@@ -142,25 +142,25 @@ void inspect_filepair(struct diff_filepair *pair)
         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;
+        struct commit *commit, *parent;
         struct commitinfo *info;
         struct commit_list *p;
         unsigned char sha1[20];
         char *query;
         char *filename;
         int i;
 
         if (get_sha1(hex, sha1)) {
                 cgit_print_error(fmt("Bad object id: %s", hex));
                 return;
         }
         commit = lookup_commit_reference(sha1);
@@ -181,31 +181,42 @@ void cgit_print_commit(const char *hex)
         html("<tr><th>committer</th><td>");
         html_txt(info->committer);
         html(" ");
         html_txt(info->committer_email);
         html("</td><td class='right'>");
         cgit_print_date(info->committer_date);
         html("</td></tr>\n");
         html("<tr><th>tree</th><td colspan='2' class='sha1'><a href='");
         query = fmt("id=%s", sha1_to_hex(commit->tree->object.sha1));
         html_attr(cgit_pageurl(cgit_query_repo, "tree", query));
         htmlf("'>%s</a></td></tr>\n", sha1_to_hex(commit->tree->object.sha1));
               for (p = commit->parents; p ; p = p->next) {
+                parent = lookup_commit_reference(p->item->object.sha1);
+                if (!parent) {
+                        html("<tr><td colspan='3'>");
+                        cgit_print_error("Error reading parent commit");
+                        html("</td></tr>");
+                        continue;
+                }
                 html("<tr><th>parent</th>"
                      "<td colspan='2' class='sha1'>"
                      "<a href='");
                 query = fmt("id=%s", sha1_to_hex(p->item->object.sha1));
                 html_attr(cgit_pageurl(cgit_query_repo, "commit", query));
-                htmlf("'>%s</a></td></tr>\n",
+                htmlf("'>%s</a> (<a href='",
                       sha1_to_hex(p->item->object.sha1));
+                query = fmt("id=%s&id2=%s", sha1_to_hex(parent->tree->object.sha1),
+                            sha1_to_hex(commit->tree->object.sha1));
+                html_attr(cgit_pageurl(cgit_query_repo, "diff", query));
+                html("'>diff</a>)</td></tr>");
         }
         if (cgit_repo->snapshots) {
                 htmlf("<tr><th>download</th><td colspan='2' class='sha1'><a href='");
                 filename = fmt("%s-%s.zip", cgit_query_repo, hex);
                 html_attr(cgit_pageurl(cgit_query_repo, "snapshot",
                                        fmt("id=%s&name=%s", hex, filename)));
                 htmlf("'>%s</a></td></tr>", filename);
         }
         html("</table>\n");
         html("<div class='commit-subject'>");
         html_txt(info->subject);
         html("</div>");