[PATCH] tag: reference with "h" instead of "id"

[John Keeping]

When clicking on "log" from a tag we end up showing the log of whatever
branch we used to reach the tag.  If the tag doesn't point onto a branch
then the tagged commit won't appear in this output.

By linking to tags with the head parameter instead of the "id" parameter
the log link will show the log of the tag.  This is clearly desirable
when the tag has been reached from the refs UI and changing the
behaviour for tag decorations makes them match branch decorations where
log -> decoration -> log shows the log of the decoration.

Reported-by: Ferry Huberts <mailings at hupie.com>
Signed-off-by: John Keeping <john at keeping.me.uk>
---
> I think we actually want something like this:
> 
> -- >8 --
> diff --git a/ui-refs.c b/ui-refs.c
> index bdd3b2c..d3017ec 100644
> --- a/ui-refs.c
> +++ b/ui-refs.c
> @@ -140,7 +140,7 @@ static int print_tag(struct refinfo *ref)
>  	}
>  
>  	html("<tr><td>");
> -	cgit_tag_link(name, NULL, NULL, ctx.qry.head, name);
> +	cgit_tag_link(name, NULL, NULL, name, NULL);
>  	html("</td><td>");
>  	if (ctx.repo->snapshots && (obj->type == OBJ_COMMIT))
>  		print_tag_downloads(ctx.repo, name);
> -- 8< --
> 
> The tag UI already does the right thing if we use "h" instead of "id".
> 
> The only thing I'm not sure about is whether we should change all tag
> links to behave like this.  That would make tag decorations consistent
> with branch decorations which already change the head, so I think that
> is the way to go.

This is what that looks like.

 ui-log.c    | 4 ++--
 ui-refs.c   | 2 +-
 ui-shared.c | 8 ++++----
 ui-shared.h | 3 +--
 4 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/ui-log.c b/ui-log.c
index 657ff3c..1b60591 100644
--- a/ui-log.c
+++ b/ui-log.c
@@ -71,11 +71,11 @@ void show_commit_decorations(struct commit *commit)
 		}
 		else if (starts_with(deco->name, "tag: refs/tags/")) {
 			strncpy(buf, deco->name + 15, sizeof(buf) - 1);
-			cgit_tag_link(buf, NULL, "tag-deco", ctx.qry.head, buf);
+			cgit_tag_link(buf, NULL, "tag-deco", buf);
 		}
 		else if (starts_with(deco->name, "refs/tags/")) {
 			strncpy(buf, deco->name + 10, sizeof(buf) - 1);
-			cgit_tag_link(buf, NULL, "tag-deco", ctx.qry.head, buf);
+			cgit_tag_link(buf, NULL, "tag-deco", buf);
 		}
 		else if (starts_with(deco->name, "refs/remotes/")) {
 			if (!ctx.repo->enable_remote_branches)
diff --git a/ui-refs.c b/ui-refs.c
index d2ba48d..ac8a6d4 100644
--- a/ui-refs.c
+++ b/ui-refs.c
@@ -140,7 +140,7 @@ static int print_tag(struct refinfo *ref)
 	}
 
 	html("<tr><td>");
-	cgit_tag_link(name, NULL, NULL, ctx.qry.head, name);
+	cgit_tag_link(name, NULL, NULL, name);
 	html("</td><td>");
 	if (ctx.repo->snapshots && (obj->type == OBJ_COMMIT))
 		print_tag_downloads(ctx.repo, name);
diff --git a/ui-shared.c b/ui-shared.c
index 32f23f9..d8cc4d7 100644
--- a/ui-shared.c
+++ b/ui-shared.c
@@ -273,9 +273,9 @@ void cgit_summary_link(const char *name, const char *title, const char *class,
 }
 
 void cgit_tag_link(const char *name, const char *title, const char *class,
-		   const char *head, const char *rev)
+		   const char *tag)
 {
-	reporevlink("tag", name, title, class, head, rev, NULL);
+	reporevlink("tag", name, title, class, tag, NULL, NULL);
 }
 
 void cgit_tree_link(const char *name, const char *title, const char *class,
@@ -443,8 +443,8 @@ static void cgit_self_link(char *name, const char *title, const char *class)
 	else if (!strcmp(ctx.qry.page, "summary"))
 		cgit_summary_link(name, title, class, ctx.qry.head);
 	else if (!strcmp(ctx.qry.page, "tag"))
-		cgit_tag_link(name, title, class, ctx.qry.head,
-			      ctx.qry.has_sha1 ? ctx.qry.sha1 : NULL);
+		cgit_tag_link(name, title, class, ctx.qry.has_sha1 ?
+			       ctx.qry.sha1 : ctx.qry.head);
 	else if (!strcmp(ctx.qry.page, "tree"))
 		cgit_tree_link(name, title, class, ctx.qry.head,
 			       ctx.qry.has_sha1 ? ctx.qry.sha1 : NULL,
diff --git a/ui-shared.h b/ui-shared.h
index f8cf220..021fe4e 100644
--- a/ui-shared.h
+++ b/ui-shared.h
@@ -18,8 +18,7 @@ extern void cgit_index_link(const char *name, const char *title,
 extern void cgit_summary_link(const char *name, const char *title,
 			      const char *class, const char *head);
 extern void cgit_tag_link(const char *name, const char *title,
-			  const char *class, const char *head,
-			  const char *rev);
+			  const char *class, const char *tag);
 extern void cgit_tree_link(const char *name, const char *title,
 			   const char *class, const char *head,
 			   const char *rev, const char *path);
-- 
2.2.1.409.g417db82