Shopper: slightly improve plugin and manual

* improve manual (hopefully fixes fs#11988). Parts of the
  description are taken from fs#10820.
* move ACTION_STD_CONTEXT from alternate select to alternate
  menu action, as not all targets have ACTION_STD_MENU
* add menu entries for "Quit" and "Quit without saving"

Change-Id: Iec86a1608756a899f9f9d7ec7d479838dfd1d95f

apps/plugins/shopper.c

@@ -320,13 +320,13 @@ enum plugin_status plugin_start(const void* parameter)
             continue;
         switch (button)
         {
-            case ACTION_STD_CONTEXT:
             case ACTION_STD_OK:
             {
                 changed |= toggle(cur_sel);
                 break;
             }
             case ACTION_STD_MENU:
+            case ACTION_STD_CONTEXT:
             {
                 switch(view)
                 {
@@ -338,7 +338,9 @@ enum plugin_status plugin_start(const void* parameter)
                                                   "Mark all items",
                                                   category_string,
                                                   "Revert to saved",
-                                                  "Show Playback Menu",);
+                                                  "Show Playback Menu",
+                                                  "Quit without saving",
+                                                  "Quit");
 
                         switch (rb->do_menu(&menu, NULL, NULL, false))
                         {
@@ -394,6 +396,20 @@ enum plugin_status plugin_start(const void* parameter)
                                 playback_control(NULL);
                                 break;
                             }
+                            case 6:
+                            {
+                                /* Quit without saving */
+                                exit = 1;
+                                break;
+                            }
+                            case 7:
+                            {
+                                /* Save and quit */
+                                if (changed)
+                                    save_changes();
+                                exit = 1;
+                                break;
+                            }
                             default:
                             {
                                 break;
@@ -409,7 +425,9 @@ enum plugin_status plugin_start(const void* parameter)
                                                   "Reset list",
                                                   category_string,
                                                   "Revert to saved",
-                                                  "Show Playback Menu",);
+                                                  "Show Playback Menu",
+                                                  "Quit without saving",
+                                                  "Quit");
 
                         switch (rb->do_menu(&menu, NULL, NULL, false))
                         {
@@ -454,6 +472,20 @@ enum plugin_status plugin_start(const void* parameter)
                                 playback_control(NULL);
                                 break;
                             }
+                            case 5:
+                            {
+                                /* Quit without saving */
+                                exit = 1;
+                                break;
+                            }
+                            case 6:
+                            {
+                                /* Save and quit */
+                                if (changed)
+                                    save_changes();
+                                exit = 1;
+                                break;
+                            }
                             default:
                             {
                                 break;

manual/plugins/shopper.tex

@@ -2,4 +2,50 @@
 \subsection{Shopper}
 \label{ref:Shopperplugin}
 
-Shopper is a shopping list plugin which allows you to maintain reusable shopping lists.
+Shopper is a plugin which allows you to maintain reusable shopping lists.
+To create a list, use a text editor to write down a list of items (one per
+line; note that the line length should not exceed 40 characters) and save the
+file as \fname{<name>.shopper}. If you want to separate the items you can do
+so by creating categories, which are prepended with `\#'. To open a
+\fname{.shopper} file just ``play'' it from the file browser.
+
+\begin{example}
+    #groceries
+    bananas
+    cucumber
+    4 apples
+    6 apples
+    #dairy
+    milk
+    cheese
+\end{example}
+Note that it isn't possible to choose exact quantities, but you can create a
+number of entries with different quantities in the name of the item, such as
+for the apples in the above example.
+
+There are two modes, \emph{edit mode} and \emph{view mode}. The edit mode
+shows all the items, and it allows you to select which of the items you want
+to buy. When you have finished selecting the items, use the menu to go to the
+view mode, and you will see only the items you wish to buy. If you `select'
+an item in view mode then that item will be removed from the list.
+
+When you exit Shopper the last view is saved, including which items you have
+selected, so if you re-open the shopping list it will be as you left it. There
+are additional menu options for clearing the list, selecting all items, showing
+and hiding the categories, toggling the categories, and displaying the playback
+menu.
+
+\subsubsection{Shopper Keys}
+\begin{btnmap}
+    \ActionStdOk{}
+        \opt{HAVEREMOTEKEYMAP}{& \ActionRCStdOk}
+     & Select or clear an item\\
+
+    \ActionStdMenu{} or \ActionStdContext{}
+      \opt{HAVEREMOTEKEYMAP}{& \ActionRCStdMenu{} or \ActionRCStdContext}
+     & Show menu\\
+
+    \ActionStdCancel{}
+        \opt{HAVEREMOTEKEYMAP}{& \ActionRCStdCancel}
+    & Exit\\
+\end{btnmap}