From 9b284ee2ced88cc843fa9254c6c41d07f6c2180a Mon Sep 17 00:00:00 2001
From: Jon Michael Aanes <jonjmaa@gmail.com>
Date: Tue, 9 Jan 2018 13:29:15 +0100
Subject: [PATCH] Implemented lazy load of platform specific functionallity,
 and a different test for that functionallity.

---
 suggest-require.lua | 38 +++++++++++++++++++++++---------------
 1 file changed, 23 insertions(+), 15 deletions(-)

diff --git a/suggest-require.lua b/suggest-require.lua
index 98de5bd..e170d70 100644
--- a/suggest-require.lua
+++ b/suggest-require.lua
@@ -56,24 +56,32 @@ local function package_config ()
     }
 end
 
-local iterate_files_in_subfiles
+local iterate_files_in_subfiles = function (...)
+    -- This outer function is a wrapper, that lazily loads the correct
+    -- version of the iterate function, based on the availability of
+    -- the commands.
 
-if package_config().dir_sep == '/' then
-    function iterate_files_in_subfiles (root_path)
-        -- On unix
-        -- Use `find` to find files in folders below the given matching.
+    if os.execute 'find -false' == 0  then
+        iterate_files_in_subfiles = function (root_path)
+            -- On unix
+            -- Use `find` to find files in folders below the given matching.
 
-        assert(type(root_path) == 'string')
-        local start_directory = root_path:match '^(.-)?' or root_path
-        local pfile       = io.popen ('find -L "'..start_directory..'" -type f ! -path \'*/\\.*\' -print0 2> /dev/null')
-        local list_str    = pfile:read '*all'
-                            pfile:close()
+            assert(type(root_path) == 'string')
+            local start_directory = root_path:match '^(.-)?' or root_path
+            local pfile       = io.popen ('find -L "'..start_directory..'" -type f ! -path \'*/\\.*\' -print0 2> /dev/null')
+            local list_str    = pfile:read '*all'
+                                pfile:close()
 
-        return list_str:gmatch '[^%z]+'
+            return list_str:gmatch '[^%z]+'
+        end
+    else
+        -- Other platforms
+        error '[suggest-require]: Your platform does not possess the "find" utility, and is thus not currently supported.'
     end
-else
-    -- On windows
-    error '[suggest-require]: Windows is not currently supported.'
+
+    -----
+
+    return iterate_files_in_subfiles(...)
 end
 
 --------------------------------------------------------------------------------
@@ -199,7 +207,7 @@ local function get_available_module_names ()
     for name in pairs(dedub) do  module_names[#module_names+1] = name  end
     table.sort(module_names)
 
-    -- Output assertions
+    -- Assert that output is correctly formatted
     assert(type(module_names) == 'table')
     for i = 1, #module_names do
         assert(type(module_names[i]) == 'string')