menubar: look for .desktop files recursively

It was missing apps/entries from /usr/share/applications/kde4.

This patch also makes sure that entries are unique (by Exec/Name).

Closes https://github.com/awesomeWM/awesome/pull/711.

lib/menubar/menu_gen.lua

@@ -25,7 +25,7 @@ if not data_dir then
 end
 
 --- Specifies all directories where menubar should look for .desktop
--- files. The search is not recursive.
+-- files. The search is recursive.
 menu_gen.all_menu_dirs = { data_dir .. 'applications/', '/usr/share/applications/', '/usr/local/share/applications/' }
 
 --- Specify the mapping of .desktop Categories section to the
@@ -83,24 +83,25 @@ local function trim(s)
 end
 
 --- Generate an array of all visible menu entries.
--- @return all menu entries.
+-- @treturn table All menu entries.
 function menu_gen.generate()
     -- Update icons for category entries
     menu_gen.lookup_category_icons()
 
     local result = {}
-
+    local unique_entries = {}
     for _, dir in ipairs(menu_gen.all_menu_dirs) do
-        local entries = utils.parse_dir(dir)
-        for _, program in ipairs(entries) do
+        for _, entry in ipairs(utils.parse_dir(dir)) do
             -- Check whether to include program in the menu
-            if program.show and program.Name and program.cmdline then
+            if entry.show and entry.Name and entry.cmdline then
+                local unique_key = entry.Name .. '\0' .. entry.cmdline
+                if not unique_entries[unique_key] then
                     local target_category = nil
-                -- Check if the program falls at least to one of the
+                    -- Check if the program falls into at least one of the
                     -- usable categories. Set target_category to be the id
                     -- of the first category it finds.
-                if program.categories then
-                    for _, category in pairs(program.categories) do
+                    if entry.categories then
+                        for _, category in pairs(entry.categories) do
                             local cat_key, cat_use =
                             get_category_name_and_usage_by_type(category)
                             if cat_key and cat_use then
@@ -110,13 +111,15 @@ function menu_gen.generate()
                         end
                     end
                     if target_category then
-                    local name = trim(program.Name) or ""
-                    local cmdline = trim(program.cmdline) or ""
-                    local icon = program.icon_path or nil
+                        local name = trim(entry.Name) or ""
+                        local cmdline = trim(entry.cmdline) or ""
+                        local icon = entry.icon_path or nil
                         table.insert(result, { name = name,
                                      cmdline = cmdline,
                                      icon = icon,
                                      category = target_category })
+                        unique_entries[unique_key] = true
+                    end
                 end
             end
         end

lib/menubar/utils.lua

@@ -240,12 +240,12 @@ function utils.parse(file)
     return program
 end
 
---- Parse a directory with .desktop files
--- @param dir The directory.
--- @return A table with all .desktop entries.
+--- Parse a directory with .desktop files recursively.
+-- @tparam string dir The directory.
+-- @treturn table Paths of found .desktop files.
 function utils.parse_dir(dir)
     local programs = {}
-    local files = io.popen('find '.. dir ..' -maxdepth 1 -name "*.desktop" 2>/dev/null')
+    local files = io.popen('find '.. dir .." -name '*.desktop' 2>/dev/null")
     for file in files:lines() do
         local program = utils.parse(file)
         if program then