Kimchi is currently not able to configure and open help pages of any
plugin tab. This patch fixes this problem and removes the HELP button
if any plugin tab or tab do not have a help configured properly for
the language being used.
(eg. plugins/<tab_html>/help/<lang>/<tab_html>.html does not exist).

Help pages for a plugin tab follow same Kimchi system:
   - html help file should have the same name of plugin html tab file
   - html files should be in plugin's " ui/pages/help/<LANG> " path
   - plugin should add following lines to <PLUGIN_NAME>.conf:
        * [/help]
        * tools.staticdir.on = True
        * tools.nocache.on = True

Signed-off-by: Rodrigo Trujillo <rodrigo.trujillo@linux.vnet.ibm.com>
---
 plugins/sample/sample.conf.in               |  4 ++++
 plugins/sample/ui/pages/help/en_US/tab.html |  1 +
 src/kimchi/config.py.in                     |  1 +
 src/kimchi/utils.py                         |  9 ++++++--
 ui/js/src/kimchi.main.js                    | 36 ++++++++++++++++++++++++++++-
 5 files changed, 48 insertions(+), 3 deletions(-)
 create mode 100644 plugins/sample/ui/pages/help/en_US/tab.html

diff --git a/plugins/sample/sample.conf.in b/plugins/sample/sample.conf.in
index 6e0908b..181616d 100644
--- a/plugins/sample/sample.conf.in
+++ b/plugins/sample/sample.conf.in
@@ -22,3 +22,7 @@ tools.kimchiauth.admin_methods = ['POST', 'PUT']
 [/circles]
 tools.kimchiauth.on = True
 tools.kimchiauth.admin_methods = ['POST', 'PUT']
+
+[/help]
+tools.staticdir.on = True
+tools.nocache.on = True
diff --git a/plugins/sample/ui/pages/help/en_US/tab.html b/plugins/sample/ui/pages/help/en_US/tab.html
new file mode 100644
index 0000000..cd32b47
--- /dev/null
+++ b/plugins/sample/ui/pages/help/en_US/tab.html
@@ -0,0 +1 @@
+Help page for Kimchi's Sample plugin.
diff --git a/src/kimchi/config.py.in b/src/kimchi/config.py.in
index fca32ee..e10f1f6 100644
--- a/src/kimchi/config.py.in
+++ b/src/kimchi/config.py.in
@@ -145,6 +145,7 @@ class PluginPaths(Paths):
         self.ui_dir = self.add_prefix(os.path.join(self.plugin_dir, 'ui'))
         self.mo_dir = self.add_prefix(os.path.join(self.plugin_dir, 'mo'))
         self.conf_file = os.path.join(self.conf_dir, '%s.conf' % name)
+        self.help_dir = os.path.join(self.ui_dir + '/pages/help')


 class UIConfig(dict):
diff --git a/src/kimchi/utils.py b/src/kimchi/utils.py
index 0977b9f..9e80e06 100644
--- a/src/kimchi/utils.py
+++ b/src/kimchi/utils.py
@@ -82,13 +82,18 @@ def is_digit(value):


 def _load_plugin_conf(name):
-    plugin_conf = PluginPaths(name).conf_file
+    plugin_paths = PluginPaths(name)
+    plugin_conf = plugin_paths.conf_file
     if not os.path.exists(plugin_conf):
         cherrypy.log.error_log.error("Plugin configuration file %s"
                                      " doesn't exist." % plugin_conf)
         return
     try:
-        return Parser().dict_from_file(plugin_conf)
+        plugin_dict = Parser().dict_from_file(plugin_conf)
+        if (os.path.exists(plugin_paths.help_dir) and '/help' in plugin_dict):
+            plugin_dict['/help']['tools.staticdir.dir'] = \
+                plugin_paths.help_dir
+        return plugin_dict
     except ValueError as e:
         cherrypy.log.error_log.error("Failed to load plugin "
                                      "conf from %s: %s" %
diff --git a/ui/js/src/kimchi.main.js b/ui/js/src/kimchi.main.js
index ba54b26..f7931da 100644
--- a/ui/js/src/kimchi.main.js
+++ b/ui/js/src/kimchi.main.js
@@ -34,9 +34,10 @@ kimchi.main = function() {
             var path = tab['path'];
             var mode = tab['mode'];
             if (mode != 'none') {
+                var disableHelp = checkHelpFile(path);
                 tabsHtml.push(
                     '<li>',
-                        '<a class="item" href="', path, '">',
+                        '<a class="item', disableHelp,'" href="', path, '">',
                             title,
                         '</a>',
                     '</li>'
@@ -46,6 +47,25 @@ kimchi.main = function() {
         return tabsHtml.join('');
     };

+    var checkHelpFile = function(path) {
+        var returnClass;
+        var lang = kimchi.lang.get();
+        url = path.replace("tabs", "/help/" + lang);
+        if (url == "/help" + lang)
+            url = url + "/index.html"
+        else if (/^plugin/.test(url)) {

+            var plugin = url.split("/").pop();
+            url = url.replace(plugin, "help/" + lang + "/" + plugin);

url = url.replace(plugin, "help/" + lang + "/" + plugin + ".html");

+        }

+        $.ajax({
+            url: url,
+            async: false,
+            error: function() { returnClass = " disableHelp"; },
+            success: function() { returnClass = ""; }
+        });
+        return returnClass;
+    };
+
     var parseTabs = function(xmlData) {
         var tabs = [];
         $(xmlData).find('tab').each(function() {
@@ -158,6 +178,15 @@ kimchi.main = function() {
         $(tab).addClass('current');
         $(tab).focus();

+        if ($(tab).hasClass("disableHelp")) {
+            $('#btn-help').prop('disabled', true);
+            $('#btn-help').hide();
+        }
+        else {
+            $('#btn-help').prop('disabled', false);
+            $('#btn-help').show();
+        }
+

         // Load page content.
         loadPage(url);
     };
@@ -297,6 +326,11 @@ kimchi.getHelp = function(e) {
         url = url.replace("#tabs", "/help/" + lang);
         if (url == "/help" + lang)
             url = url + "/index.html"
+        else if (/^#plugin/.test(url)) {
+            var plugin = url.split("/").pop();
+            url = url.replace("#", "");
+            url = url.replace(plugin, "help/" + lang + "/" + plugin + ".html");
+        }
         else
             url = url + ".html";