gitweb: Even more support for PATH_INFO based URLs

Now the following types of path based URLs are supported:

* project              overview (summary) page of project
* project/branch       shortlog of branch
* project/branch:file  file in branch, blob_plain view
* project/branch:dir/  directory listing of dir in branch, tree view

The following shortcuts works (see explanation below):

* project/branch:      directory listing of branch, main tree view
* project/:file        file in HEAD (raw)
* project/:dir/        directory listing of dir in HEAD
* project/:            directory listing of project's HEAD

We use ':' as separator between branch (ref) name and file name
(pathname) because valid branch (ref) name cannot have ':' inside.
This limit applies to branch name only. This allow for hierarchical
branches e.g. topic branch 'topic/subtopic', separate remotes
tracking branches e.g. 'refs/remotes/origin/HEAD', and discriminate
between head (branch) and tag with the same name.

Empty branch should be interpreted as HEAD.

If pathname (the part after ':') ends with '/', we assume that pathname
is name of directory, and we want to show contents of said directory
using "tree" view. If pathname is empty, it is equivalent to '/' (top
directory).

If pathname (the part after ':') does not end with '/', we assume that
pathname is name of file, and we show contents of said file using
"blob_plain" view.

Pathname is stripped of leading '/', so we can use ':/' to separate
branch from pathname. The rationale behind support for PATH_INFO based
URLs was to support project web pages for small projects: just create
an html branch and then use an URL like
  http://nowhere.com/gitweb.cgi/project.git/html:/index.html
The ':/' syntax allow for working links between .html files served
in such way, e.g. <a href="main.html"> link inside "index.html"
would get
  http://nowhere.com/gitweb.cgi/project.git/html:/main.html.

Signed-off-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/gitweb/gitweb.perl b/gitweb/gitweb.perl
index 969c2de95125e08a44c1518eadc264ce6f9cc8c7..5f597f71e05376268d55742f288888d30b93c240 100755 (executable)
--- a/gitweb/gitweb.perl
+++ b/gitweb/gitweb.perl
@@ -274,13 +274,16 @@ sub evaluate_path_info {
        return if defined $project;
        my $path_info = $ENV{"PATH_INFO"};
        return if !$path_info;
-       $path_info =~ s,(^/|/$),,gs;
-       $path_info = validate_input($path_info);
+       $path_info =~ s,^/+,,;
        return if !$path_info;
+       # find which part of PATH_INFO is project
        $project = $path_info;
+       $project =~ s,/+$,,;
        while ($project && !-e "$projectroot/$project/HEAD") {
                $project =~ s,/*[^/]*$,,;
        }
+       # validate project
+       $project = validate_input($project);
        if (!$project ||
            ($export_ok && !-e "$projectroot/$project/$export_ok") ||
            ($strict_export && !project_in_list($project))) {
@@ -289,15 +292,23 @@ sub evaluate_path_info {
        }
        # do not change any parameters if an action is given using the query string
        return if $action;
-       if ($path_info =~ m,^$project/([^/]+)/(.+)$,) {
-               # we got "project.git/branch/filename"
-               $action    ||= "blob_plain";
-               $hash_base ||= validate_input($1);
-               $file_name ||= validate_input($2);
-       } elsif ($path_info =~ m,^$project/([^/]+)$,) {
+       $path_info =~ s,^$project/*,,;
+       my ($refname, $pathname) = split(/:/, $path_info, 2);
+       if (defined $pathname) {
+               # we got "project.git/branch:filename" or "project.git/branch:dir/"
+               # we could use git_get_type(branch:pathname), but it needs $git_dir
+               $pathname =~ s,^/+,,;
+               if (!$pathname || substr($pathname, -1) eq "/") {
+                       $action  ||= "tree";
+               } else {
+                       $action  ||= "blob_plain";
+               }
+               $hash_base ||= validate_input($refname);
+               $file_name ||= validate_input($pathname);
+       } elsif (defined $refname) {
                # we got "project.git/branch"
                $action ||= "shortlog";
-               $hash   ||= validate_input($1);
+               $hash   ||= validate_input($refname);
        }
 }
 evaluate_path_info();