gitweb: parse parent..current syntax from PATH_INFO

This patch makes it possible to use an URL such as
project/action/somebranch..otherbranch:/filename to get a diff between
different version of a file. Paths like
project/action/somebranch:/somefile..otherbranch:/otherfile are parsed
as well.

All '*diff' actions and in general actions that use $hash_parent[_base]
and $file_parent (e.g. 'shortlog') can now get all of their parameters
from PATH_INFO

Signed-off-by: Giuseppe Bilotta <giuseppe.bilotta@gmail.com>
Acked-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/gitweb/gitweb.perl b/gitweb/gitweb.perl
index f8021da967ee1ccf1bf64139582c6042a2656a20..3d62019e1f451ee563293c84ba391e4743b90fd9 100755 (executable)
--- a/gitweb/gitweb.perl
+++ b/gitweb/gitweb.perl
@@ -549,7 +549,12 @@ sub evaluate_path_info {
                'history',
        );
 
-       my ($refname, $pathname) = split(/:/, $path_info, 2);
+       # we want to catch
+       # [$hash_parent_base[:$file_parent]..]$hash_parent[:$file_name]
+       my ($parentrefname, $parentpathname, $refname, $pathname) =
+               ($path_info =~ /^(?:(.+?)(?::(.+))?\.\.)?(.+?)(?::(.+))?$/);
+
+       # first, analyze the 'current' part
        if (defined $pathname) {
                # we got "branch:filename" or "branch:dir/"
                # we could use git_get_type(branch:pathname), but:
@@ -564,7 +569,13 @@ sub evaluate_path_info {
                        $input_params{'action'} ||= "tree";
                        $pathname =~ s,/$,,;
                } else {
-                       $input_params{'action'} ||= "blob_plain";
+                       # the default action depends on whether we had parent info
+                       # or not
+                       if ($parentrefname) {
+                               $input_params{'action'} ||= "blobdiff_plain";
+                       } else {
+                               $input_params{'action'} ||= "blob_plain";
+                       }
                }
                $input_params{'hash_base'} ||= $refname;
                $input_params{'file_name'} ||= $pathname;
@@ -584,6 +595,27 @@ sub evaluate_path_info {
                        $input_params{'hash'} ||= $refname;
                }
        }
+
+       # next, handle the 'parent' part, if present
+       if (defined $parentrefname) {
+               # a missing pathspec defaults to the 'current' filename, allowing e.g.
+               # someproject/blobdiff/oldrev..newrev:/filename
+               if ($parentpathname) {
+                       $parentpathname =~ s,^/+,,;
+                       $parentpathname =~ s,/$,,;
+                       $input_params{'file_parent'} ||= $parentpathname;
+               } else {
+                       $input_params{'file_parent'} ||= $input_params{'file_name'};
+               }
+               # we assume that hash_parent_base is wanted if a path was specified,
+               # or if the action wants hash_base instead of hash
+               if (defined $input_params{'file_parent'} ||
+                       grep { $_ eq $input_params{'action'} } @wants_base) {
+                       $input_params{'hash_parent_base'} ||= $parentrefname;
+               } else {
+                       $input_params{'hash_parent'} ||= $parentrefname;
+               }
+       }
 }
 evaluate_path_info();