Add cgit_diff_link()

This adds a new function used to generate links to the diff page and uses
it everywhere such links appear (expect for single files in the diffstat
displayed on the commit page: this is now a link to the tree page).

The updated diff-page now expects zero, one or two revision specifiers, in
parameters head, id and id2. Id defaults to head unless otherwise specified,
while head (as usual) defaults to repo.defbranch. If id2 isn't specified, it
defaults to the first parent of id1.

The most important change is of course that now all repo pages (summary, log,
tree, commit and diff) has support for passing on the current branch and
revision, i.e. the road is now open for a 'static' menu with links to all
of these pages.

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

1 files changed, 16 insertions, 30 deletions

diff --git a/ui-commit.c b/ui-commit.c
index d489d7c..2679b59 100644
--- a/ui-commit.c
+++ b/ui-commit.c
@@ -1,242 +1,228 @@
 /* ui-commit.c: generate commit view
  *
  * Copyright (C) 2006 Lars Hjemli
  *
  * Licensed under GNU General Public License v2
  *   (see COPYING for full license text)
  */
 
 #include "cgit.h"
 
 static int files, slots;
 static int total_adds, total_rems, max_changes;
 static int lines_added, lines_removed;
+static char *curr_rev;
 
 static 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, *query2;
         char *class;
 
         switch (info->status) {
         case DIFF_STATUS_ADDED:
                 class = "add";
                 break;
         case DIFF_STATUS_COPIED:
                 class = "cpy";
                 break;
         case DIFF_STATUS_DELETED:
                 class = "del";
                 break;
         case DIFF_STATUS_MODIFIED:
                 class = "upd";
                 break;
         case DIFF_STATUS_RENAMED:
                 class = "mov";
                 break;
         case DIFF_STATUS_TYPE_CHANGED:
                 class = "typ";
                 break;
         case DIFF_STATUS_UNKNOWN:
                 class = "unk";
                 break;
         case DIFF_STATUS_UNMERGED:
                 class = "stg";
                 break;
         default:
                 die("bug: unhandled diff status %c", info->status);
         }
 
         html("<tr>");
         htmlf("<td class='mode'>");
         if (is_null_sha1(info->new_sha1)) {
                 html_filemode(info->old_mode);
         } 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&amp;id2=%s&amp;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>)");
-        } else {
-                html_txt(info->new_path);
-                html("</a>");
-        }
+        cgit_tree_link(info->new_path, NULL, NULL, cgit_query_head, curr_rev,
+                       info->new_path);
+        if (info->status == DIFF_STATUS_COPIED || info->status == DIFF_STATUS_RENAMED)
+                htmlf(" (%s from %s)",
+                      info->status == DIFF_STATUS_COPIED ? "copied" : "renamed",
+                      info->old_path);
         html("</td><td class='right'>");
         htmlf("%d", info->added + info->removed);
         html("</td><td class='graph'>");
         htmlf("<table width='%d%%'><tr>", (max_changes > 100 ? 100 : max_changes));
         htmlf("<td class='add' style='width: %.1f%%;'/>",
               info->added * 100.0 / max_changes);
         htmlf("<td class='rem' style='width: %.1f%%;'/>",
               info->removed * 100.0 / max_changes);
         htmlf("<td class='none' style='width: %.1f%%;'/>",
               (max_changes - info->removed - info->added) * 100.0 / max_changes);
         html("</tr></table></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)
+void cgit_print_commit(char *hex)
 {
         struct commit *commit, *parent;
         struct commitinfo *info;
         struct commit_list *p;
         unsigned char sha1[20];
-        char *query;
         char *filename;
         char *tmp;
         int i;
 
         if (!hex)
                 hex = cgit_query_head;
+        curr_rev = hex;
 
         if (get_sha1(hex, sha1)) {
                 cgit_print_error(fmt("Bad object id: %s", hex));
                 return;
         }
         commit = lookup_commit_reference(sha1);
         if (!commit) {
                 cgit_print_error(fmt("Bad commit reference: %s", hex));
                 return;
         }
         info = cgit_parse_commit(commit);
 
         html("<table class='commit-info'>\n");
         html("<tr><th>author</th><td>");
         html_txt(info->author);
         html(" ");
         html_txt(info->author_email);
         html("</td><td class='right'>");
         cgit_print_date(info->author_date, FMT_LONGDATE);
         html("</td></tr>\n");
         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, FMT_LONGDATE);
         html("</td></tr>\n");
         html("<tr><th>tree</th><td colspan='2' class='sha1'>");
         tmp = xstrdup(hex);
         cgit_tree_link(sha1_to_hex(commit->tree->object.sha1), NULL, NULL,
                        cgit_query_head, tmp, NULL);
         html("</td></tr>\n");
               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'>");
                 cgit_commit_link(sha1_to_hex(p->item->object.sha1), NULL, NULL,
                                  cgit_query_head, sha1_to_hex(p->item->object.sha1));
-                html(" (<a href='");
-                query = fmt("id=%s&amp;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>");
+                html(" (");
+                cgit_diff_link("diff", NULL, NULL, cgit_query_head, hex,
+                               sha1_to_hex(p->item->object.sha1), NULL);
+                html(")</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&amp;name=%s", hex, filename)));
                 htmlf("'>%s</a></td></tr>", filename);
         }
         html("</table>\n");
         html("<div class='commit-subject'>");
         html_txt(info->subject);
         html("</div>");
         html("<div class='commit-msg'>");
         html_txt(info->msg);
         html("</div>");
         if (!(commit->parents && commit->parents->next && commit->parents->next->next)) {
                 html("<div class='diffstat-header'>Diffstat</div>");
                 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 (",
                       files, total_adds, total_rems);
-                query = fmt("h=%s", hex);
-                html_link_open(cgit_pageurl(cgit_query_repo, "diff", query), NULL, NULL);
-                html("show diff</a>)");
-                html("</div>");
+                cgit_diff_link("show diff", NULL, NULL, cgit_query_head, hex,
+                               NULL, NULL);
+                html(")</div>");
         }
         cgit_free_commitinfo(info);
 }