feat: add Windows where file finder command (#979)

lua/telescope/builtin/files.lua

@@ -7,6 +7,7 @@ local pickers = require('telescope.pickers')
 local previewers = require('telescope.previewers')
 local utils = require('telescope.utils')
 local conf = require('telescope.config').values
+local log = require('telescope.log')
 
 local scan = require('plenary.scandir')
 local Path = require('plenary.path')
@@ -173,7 +174,7 @@ files.find_files = function(opts)
           table.insert(find_command, v)
         end
       end
-    elseif 1 == vim.fn.executable("find") then
+    elseif 1 == vim.fn.executable("find") and not vim.fn.has('win32') then
       find_command = { 'find', '.', '-type', 'f' }
       if not hidden then
         table.insert(find_command, { '-not', '-path', "*/.*" })
@@ -186,6 +187,17 @@ files.find_files = function(opts)
           table.insert(find_command, 2, v)
         end
       end
+    elseif 1 == vim.fn.executable("where") then
+      find_command = { 'where', '/r', '.', '*'}
+      if hidden ~= nil then
+        log.warn('The `hidden` key is not available for the Windows `where` command in `find_files`.')
+      end
+      if follow ~= nil then
+        log.warn('The `follow` key is not available for the Windows `where` command in `find_files`.')
+      end
+      if search_dirs ~= nil then
+        log.warn('The `search_dirs` key is not available for the Windows `where` command in `find_files`.')
+      end
     end
   end