diff --git a/src/IDF/Git.php b/src/IDF/Git.php
index 4f37ad3..dad0a4a 100644
--- a/src/IDF/Git.php
+++ b/src/IDF/Git.php
@@ -23,92 +23,143 @@
 
 /**
  * Git utils.
+ *
  */
 class IDF_Git
 {
     public $repo = '';
+    public $mediumtree_fmt = 'commit %H%nAuthor: %an <%ae>%nTree: %T%nDate: %ai%n%n%s%n%n%b';
     
     public function __construct($repo)
     {
         $this->repo = $repo;
     }
 
+
+    /**
+     * Test a given object hash.
+     *
+     * @param string Object hash.
+     * @return mixed false if not valid or 'blob', 'tree', 'commit'
+     */
+    public function testHash($hash)
+    {
+        $cmd = sprintf('GIT_DIR=%s git cat-file -t %s',
+                       escapeshellarg($this->repo),
+                       escapeshellarg($hash));
+        $ret = 0; $out = array();
+        exec($cmd, &$out, &$ret);
+        if ($ret != 0) return false;
+        return trim($out[0]);
+    }
+
     /**
-     * Given a commit hash (or a branch) returns an array of files in
-     * it.
+     * Given a commit hash returns an array of files in it.
      *
      * A file is a class with the following properties:
      *
      * 'perm', 'type', 'size', 'hash', 'file'
      *
-     * @param string Tree ('HEAD')
+     * @param string Commit ('HEAD')
      * @param string Base folder ('')
      * @return array 
      */
-    public function filesInTree($tree='HEAD', $basefolder='')
+    public function filesAtCommit($commit='HEAD', $folder='')
     {
-        if (is_object($basefolder)) {
-            $base = $basefolder;
-        } else if (
-                   $basefolder !=  ''
-                   and
-            (
-             (false === ($base=$this->getFileInfo($basefolder, $tree)))
-             or
-             ($base->type != 'tree')
-             )) {
-            throw new Exception(sprintf('Base folder "%s" not found.', $basefolder));
+        if ('commit' != $this->testHash($commit)) {
+            throw new Exception(sprintf(__('Not a valid commit: %s.'), $commit));
+        }
+        // now we grab the info about this commit including its tree.
+        $co = $this->getCommit($commit);
+        if ($folder) {
+            // As we are limiting to a given folder, we need to find
+            // the tree corresponding to this folder.
+            $found = false;
+            foreach ($this->getTreeInfo($co->tree) as $file) {
+                if ($file->type == 'tree' and $file->file == $folder) {
+                    $found = true;
+                    $tree = $file->hash;
+                    break;
+                }
+            }
+            if (!$found) {
+                throw new Exception(sprintf(__('Folder %1$s not found in commit %2$s.'), $folder, $commit));
+            }
         } else {
-            // no base
-            $base = (object) array('file' => '',
-                                   'hash' => $tree);
+            $tree = $co->tree;
         }
-        
         $res = array();
-        $out = array();
-        $cmd = sprintf('GIT_DIR=%s git-ls-tree -t -l %s', $this->repo, $base->hash);
-        exec($cmd, &$out);
+        // get the raw log corresponding to this commit to find the
+        // origin of each file.
         $rawlog = array();
-        foreach ($this->getBranches() as $br) {
-            $cmd = sprintf('GIT_DIR=%s git log --raw --abbrev=40 --pretty=oneline %s',
-                           $this->repo, $br);
-            exec($cmd, &$rawlog);
-        }
+        $cmd = sprintf('GIT_DIR=%s git log --raw --abbrev=40 --pretty=oneline %s',
+                       escapeshellarg($this->repo), escapeshellarg($commit));
+        exec($cmd, &$rawlog);
+        // We reverse the log to be able to use a fixed efficient
+        // regex without back tracking.
         $rawlog = implode("\n", array_reverse($rawlog));
-        $current_dir = getcwd();
-        chdir(substr($this->repo, 0, -5));
-        foreach ($out as $line) {
-            list($perm, $type, $hash, $size, $file) = preg_split('/ |\t/', $line, 5, PREG_SPLIT_NO_EMPTY);
+        foreach ($this->getTreeInfo($tree, false) as $file) {
+            // Now we grab the files in the current tree with as much
+            // information as possible.
             $matches = array();
-            $date = '1970-01-01 12:00:00';
-            $log = '';
-            if ($type == 'blob' and preg_match('/^\:\d{6} \d{6} [0-9a-f]{40} '.$hash.' .*^([0-9a-f]{40})/msU',
+            if ($file->type == 'blob' and preg_match('/^\:\d{6} \d{6} [0-9a-f]{40} '.$file->hash.' .*^([0-9a-f]{40})/msU',
                            $rawlog, &$matches)) {
-                $_c = $this->getCommit($matches[1]);
-                $date = $_c->date;
-                $log = $_c->title;
+                $fc = $this->getCommit($matches[1]);
+                $file->date = $fc->date;
+                $file->log = $fc->title;
+            } else if ($file->type == 'blob') {
+                $file->date = $co->date;
+                $file->log = $co->title;
             }
+            $file->fullpath = ($folder) ? $folder.'/'.$file->file : $file->file;
+            $res[] = $file;
+        }
+        return $res;
+    }
+
+    /**
+     * Get the tree info.
+     *
+     * @param string Tree hash 
+     * @param bool Do we recurse in subtrees (true)
+     * @return array Array of file information.
+     */
+    public function getTreeInfo($tree, $recurse=true)
+    {
+        if ('tree' != $this->testHash($tree)) {
+            throw new Exception(sprintf(__('Not a valid tree: %s.'), $tree));
+        }
+        $cmd_tmpl = 'GIT_DIR=%s git-ls-tree%s -t -l %s';
+        $cmd = sprintf($cmd_tmpl, 
+                       escapeshellarg($this->repo), 
+                       ($recurse) ? ' -r' : '',
+                       escapeshellarg($tree));
+        $out = array();
+        $res = array();
+        exec($cmd, &$out);
+        foreach ($out as $line) {
+            list($perm, $type, $hash, $size, $file) = preg_split('/ |\t/', $line, 5, PREG_SPLIT_NO_EMPTY);
             $res[] = (object) array('perm' => $perm, 'type' => $type, 
                                     'size' => $size, 'hash' => $hash, 
-                                    'fullpath' => ($base->file) ? $base->file.'/'.$file : $file,
-                                    'log' => $log, 'date' => $date,
                                     'file' => $file);
         }
-        chdir($current_dir);
         return $res;
     }
 
+
     /**
      * Get the file info.
      *
      * @param string File
-     * @param string Tree ('HEAD')
+     * @param string Commit ('HEAD')
      * @return false Information
      */
-    public function getFileInfo($totest, $tree='HEAD')
+    public function getFileInfo($totest, $commit='HEAD')
     {
         $cmd_tmpl = 'GIT_DIR=%s git-ls-tree -r -t -l %s';
-        $cmd = sprintf($cmd_tmpl, $this->repo, $tree);
+        $cmd = sprintf($cmd_tmpl, 
+                       escapeshellarg($this->repo), 
+                       escapeshellarg($commit));
         $out = array();
         exec($cmd, &$out);
         foreach ($out as $line) {
@@ -131,7 +182,8 @@ class IDF_Git
     public function getBlob($hash)
     {
         return shell_exec(sprintf('GIT_DIR=%s git-cat-file blob %s',
-                                  $this->repo, $hash));
+                                  escapeshellarg($this->repo), 
+                                  escapeshellarg($hash)));
     }
 
     /**
@@ -142,7 +194,8 @@ class IDF_Git
     public function getBranches()
     {
         $out = array();
-        exec(sprintf('GIT_DIR=%s git branch', $this->repo), &$out);
+        exec(sprintf('GIT_DIR=%s git branch', 
+                     escapeshellarg($this->repo)), &$out);
         $res = array();
         foreach ($out as $b) {
             $res[] = substr($b, 2);
@@ -158,8 +211,10 @@ class IDF_Git
      */
     public function getCommit($commit='HEAD')
     {
-        $cmd = sprintf('GIT_DIR=%s git show --date=iso --pretty=medium %s',
-                       escapeshellarg($this->repo), $commit);
+        $cmd = sprintf('GIT_DIR=%s git show --date=iso --pretty=format:%s %s',
+                       escapeshellarg($this->repo), 
+                       "'".$this->mediumtree_fmt."'", 
+                       escapeshellarg($commit);
         $out = array();
         exec($cmd, &$out);
         $log = array();
@@ -175,7 +230,7 @@ class IDF_Git
                 $log[] = $line;
             }
         }
-        $out = self::parseLog($log);
+        $out = self::parseLog($log, 4);
         $out[0]->changes = $change;
         return $out[0];
     }
@@ -184,20 +239,19 @@ class IDF_Git
     /**
      * Get latest changes.
      *
-     * @param string Tree ('HEAD').
+     * @param string Commit ('HEAD').
      * @param int Number of changes (10).
      * @return array Changes.
      */
-    public function getChangeLog($tree='HEAD', $n=10)
+    public function getChangeLog($commit='HEAD', $n=10)
     {
-        $format = 'commit %H%nAuthor: %an <%ae>%nTree: %T%nDate: %ai%n%n%s%n%n%b';
         if ($n === null) $n = '';
         else $n = ' -'.$n;
         $cmd = sprintf('GIT_DIR=%s git log%s --date=iso --pretty=format:\'%s\' %s',
-                       escapeshellarg($this->repo), $n, $format, $tree);
+                       escapeshellarg($this->repo), $n, $this->mediumtree_fmt, 
+                       escapeshellarg($commit));
         $out = array();
         exec($cmd, &$out);
-        //print_r($cmd);
         return self::parseLog($out, 4);
     }
 
diff --git a/src/IDF/Views/Source.php b/src/IDF/Views/Source.php
index 8a4b31c..a276f40 100644
--- a/src/IDF/Views/Source.php
+++ b/src/IDF/Views/Source.php
@@ -53,26 +53,18 @@ class IDF_Views_Source
     {
         $title = sprintf('%s Git Source Tree', (string) $request->project);
         $git = new IDF_Git(Pluf::f('git_repository'));
+        $commit = $match[2];
         $branches = $git->getBranches();
-        $res = $git->filesInTree($match[2]);
-        $tree = $match[2];
-        $cobject = '';
-        $tree_in = in_array($tree, $branches);
-        foreach ($branches as $br) {
-            foreach ($git->getChangeLog($br, null) as $change) {
-                if ($change->tree == $tree) {
-                    $cobject = $change;
-                    break 2;
-                }
-            }
-        }
+        $res = $git->filesAtCommit($commit);
+        $cobject = $git->getCommit($commit);
+        $tree_in = in_array($commit, $branches);
         return Pluf_Shortcuts_RenderToResponse('source/tree.html',
                                                array(
                                                      'page_title' => $title,
                                                      'title' => $title,
                                                      'files' => $res,
                                                      'cobject' => $cobject,
-                                                     'tree' => $tree,
+                                                     'commit' => $commit,
                                                      'tree_in' => $tree_in,
                                                      'branches' => $branches,
                                                      ),
@@ -83,39 +75,31 @@ class IDF_Views_Source
     {
         $title = sprintf('%s Git Source Tree', (string) $request->project);
         $git = new IDF_Git(Pluf::f('git_repository'));
-        $tree = $match[2];
+        $commit = $match[2];
         $request_file = $match[3];
-        $request_file_info = $git->getFileInfo($request_file, $tree);
+        $request_file_info = $git->getFileInfo($request_file, $commit);
         if (!$request_file_info) throw new Pluf_HTTP_Error404();
         if ($request_file_info->type != 'tree') {
             return new Pluf_HTTP_Response($git->getBlob($request_file_info->hash),
                                           'application/octet-stream');
         }
-        $bc = self::makeBreadCrumb($request->project, $tree, $request_file_info->file);
+        $bc = self::makeBreadCrumb($request->project, $commit, $request_file_info->file);
         $page_title = $bc.' - '.$title;
         $branches = $git->getBranches();
-        $cobject = '';
-        $tree_in = in_array($tree, $branches);
-        $res = $git->filesInTree($tree, $request_file_info);
+        $cobject = $git->getCommit();
+        $tree_in = in_array($commit, $branches);
+        $res = $git->filesAtCommit($commit, $request_file);
         // try to find the previous level if it exists.
         $prev = split('/', $request_file);
         $l = array_pop($prev);
         $previous = substr($request_file, 0, -strlen($l.' '));
-        foreach ($branches as $br) {
-            foreach ($git->getChangeLog($br, null) as $change) {
-                if ($change->tree == $tree) {
-                    $cobject = $change; 
-                    break 2;
-                }
-            }
-        }
         return Pluf_Shortcuts_RenderToResponse('source/tree.html',
                                                array(
                                                      'page_title' => $page_title,
                                                      'title' => $title,
                                                      'breadcrumb' => $bc,
                                                      'files' => $res,
-                                                     'tree' => $tree,
+                                                     'commit' => $commit,
                                                      'cobject' => $cobject,
                                                      'base' => $request_file_info->file,
                                                      'prev' => $previous,
@@ -125,7 +109,7 @@ class IDF_Views_Source
                                                $request);
     }
 
-    public static function makeBreadCrumb($project, $tree, $file, $sep='/')
+    public static function makeBreadCrumb($project, $commit, $file, $sep='/')
     {
         $elts = split('/', $file);
         $out = array();
@@ -135,7 +119,7 @@ class IDF_Views_Source
             $stack .= ($i==0) ? $elt : '/'.$elt;
             $url = Pluf_HTTP_URL_urlForView('IDF_Views_Source::tree',
                                             array($project->shortname,
-                                                  $tree, $stack));
+                                                  $commit, $stack));
             $out[] = '<a href="'.$url.'">'.Pluf_esc($elt).'</a>';
             $i++;
         }
diff --git a/src/IDF/templates/source/base.html b/src/IDF/templates/source/base.html
index a9fd256..9c9e97a 100644
--- a/src/IDF/templates/source/base.html
+++ b/src/IDF/templates/source/base.html
@@ -2,8 +2,8 @@
 {block tabsource} class="active"{/block}
 {block subtabs}
 <div id="sub-tabs">
-{trans 'Source Tree'} |
-<a href="{url 'IDF_Views_Source::changeLog', array($project.shortname, 'master')}">{trans 'Change Log'}</a>
+<a {if $inSourceTree}class="active" {/if}href="{url 'IDF_Views_Source::treeBase', array($project.shortname, 'master')}">{trans 'Source Tree'}</a> |
+<a {if $inChangeLog}class="active" {/if}href="{url 'IDF_Views_Source::changeLog', array($project.shortname, 'master')}">{trans 'Change Log'}</a>
 </div>
 {/block}
 {block title}{$title}{/block}
diff --git a/src/IDF/templates/source/changelog.html b/src/IDF/templates/source/changelog.html
index 7e8a707..d056194 100644
--- a/src/IDF/templates/source/changelog.html
+++ b/src/IDF/templates/source/changelog.html
@@ -1,23 +1,31 @@
 {extends "source/base.html"}
-{block docclass}yui-t1{/block}
+{block docclass}yui-t1{assign $inChangeLog=true}{/block}
 {block body}
 <table summary="" class="tree-list">
 <thead>
 <tr>
 <th>{trans 'Age'}</th>
 <th>{trans 'Message'}</th>
-<th>{trans 'Details'}</th>
+{* <th>{trans 'Details'}</th> *}
 </tr>
 </thead>
 <tbody>
 {foreach $changes as $change}
-{aurl 'url', 'IDF_Views_Source::treeBase', array($project.shortname, $change.tree)}
-<tr>
+{aurl 'url', 'IDF_Views_Source::treeBase', array($project.shortname, $change.commit)}
+<tr class="log">
 <td><a href="{$url}">{$change.date|dateago:"wihtout"}</a></td>
-<td>{$change.title}{if $change.full_message}<br /><span class="smaller">{$change.full_message}</span>{/if}</td>
-<td><span class="smaller">{trans 'Tree:'}&nbsp;<a href="{$url}">{$change.tree}</a><br />
-{trans 'By:'} {$change.author|strip_tags} {* this remove the email address *}
-</span></td>
+<td>{$change.title}{if $change.full_message}<br /><br />{$change.full_message}{/if}</td>
+</tr>
+<tr class="extra">
+<td colspan="2">
+<div class="helptext right">{trans 'Commit:'}&nbsp;<a href="{$url}" class="mono">{$change.commit}</a>, 
+{trans 'by'} {$change.author|strip_tags} {* this remove the email address *}
+</div>
+
+</td>
+{* <td><span class="smaller">{trans 'Tree:'}&nbsp;<a href="{$url}">{$change.commit}</a><br />
+{trans 'By:'} {$change.author|strip_tags} 
+</span></td> *}
 </tr>
 {/foreach}
 </tbody>
diff --git a/src/IDF/templates/source/tree.html b/src/IDF/templates/source/tree.html
index 357db18..b63f8b3 100644
--- a/src/IDF/templates/source/tree.html
+++ b/src/IDF/templates/source/tree.html
@@ -1,7 +1,7 @@
 {extends "source/base.html"}
-{block docclass}yui-t1{/block}
+{block docclass}yui-t1{assign $inSourceTree=true}{/block}
 {block body}
-<h2><a href="{url 'IDF_Views_Source::treeBase', array($project.shortname, $tree)}">{trans 'Root'}</a><span class="sep">/</span>{if $breadcrumb}{$breadcrumb|safe}{/if}</h2>
+<h2><a href="{url 'IDF_Views_Source::treeBase', array($project.shortname, $commit)}">{trans 'Root'}</a><span class="sep">/</span>{if $breadcrumb}{$breadcrumb|safe}{/if}</h2>
 <table summary="" class="tree-list">
 <thead>
 <tr>
@@ -11,26 +11,31 @@
 <th>{trans 'Size'}</th>
 </tr>
 </thead>{if !$tree_in}
-{aurl 'url', 'IDF_Views_Source::treeBase', array($project.shortname, $tree)} 
+{aurl 'url', 'IDF_Views_Source::treeBase', array($project.shortname, $commit)} 
 <tfoot>
-<tr><th colspan="5">{blocktrans}In tree <a href="{$url}">{$tree}</a> created {$cobject.date|dateago}.{/blocktrans}</th></tr>
+<tr><th colspan="5">{blocktrans}In commit <a class="mono" href="{$url}">{$commit}</a> created {$cobject.date|dateago}.{/blocktrans}<br />
+<span class="smaller">{blocktrans}By {$cobject.author|strip_tags|trim}, {$cobject.title}{/blocktrans}</span>
+</th></tr>
 </tfoot>
 {/if}<tbody>
 {if $base}
 <tr>
 <td>&nbsp;</td>
-<td colspan="4">
-<a href="{url 'IDF_Views_Source::tree', array($project.shortname, $tree, $prev)}">..</a></td>
+<td>
+<a href="{url 'IDF_Views_Source::tree', array($project.shortname, $commit, $prev)}">..</a></td>
+<td colspan="3"></td>
 </tr>
 {/if}
 {foreach $files as $file}
-{aurl 'url', 'IDF_Views_Source::tree', array($project.shortname, $tree, $file.fullpath)}
+{aurl 'url', 'IDF_Views_Source::tree', array($project.shortname, $commit, $file.fullpath)}
 <tr>
-<td><img src="{media '/idf/img/'~$file.type~'.png'}" alt="{$file.type}" /></td>
+<td class="fileicon"><img src="{media '/idf/img/'~$file.type~'.png'}" alt="{$file.type}" /></td>
 <td{if $file.type != 'blob'} colspan="4"{/if}><a href="{$url}">{$file.file}</a></td>
 {if $file.type == 'blob'}
+{if isset($file.date)}
 <td><span class="smaller">{$file.date|dateago:"wihtout"}</span></td> 
 <td><span class="smaller">{$file.log}</span></td>
+{else}<td colspan="2"></td>{/if}
 <td>{$file.size|size}</td>{/if}
 </tr>
 {/foreach}
@@ -42,7 +47,7 @@
 <p><strong>{trans 'Branches:'}</strong><br />
 {foreach $branches as $branch}
 {aurl 'url', 'IDF_Views_Source::treeBase', array($project.shortname, $branch)}
-<span class="label{if $tree == $branch} active{/if}"><a href="{$url}" class="label">{$branch}</a></span><br />
+<span class="label{if $commit == $branch} active{/if}"><a href="{$url}" class="label">{$branch}</a></span><br />
 {/foreach}
 </p>
 {/block}
diff --git a/www/media/idf/css/style.css b/www/media/idf/css/style.css
index 8183dec..c5473be 100644
--- a/www/media/idf/css/style.css
+++ b/www/media/idf/css/style.css
@@ -23,6 +23,14 @@
   padding: 0 1em;
 }
 
+.right { 
+  text-align: right;
+}
+
+.mono { 
+  font-family: monospace;
+}
+
 div.context { 
   padding-left: 1em;
 }
@@ -259,7 +267,7 @@ table.tree-list {
 table.tree-list th { 
   background-color: #e4e8E0; 
   vertical-align: top;
-  border-color: #d3d7cf;
+  border-color: #d3d7cf; 
 }
 
 table.tree-list tr { 
@@ -278,12 +286,25 @@ table.tree-list tfoot th {
   font-weight: normal;
 }
 
-table.recent-issues tfoot th a { 
+table.tree-list tfoot th a { 
   color: #000;
   font-weight: normal;
 }
 
+table.tree-list tr.log { 
+  border-bottom: 1px solid #e7ebe3; 
+  /* background-color: #eef2ea !important; */
+}
+
+table.tree-list tr.extra { 
+/*  border-bottom: 1px solid #e7ebe3;  */
+/*  background-color: #eef2ea !important; */
+}
+
+table td.fileicon { 
+  width: 20px;
 
+}
 
 /**
  * Autocomplete.