fix: Multiple Previewer fixes (#225)

Fixes previews for files beginning with ~/
Previewer will now show directories
Fix if clause with vim.fn.executable

lua/telescope/builtin.lua

@@ -842,9 +842,7 @@ builtin.man_pages = function(opts)
 
   local cmd = opts.man_cmd or "apropos --sections=1 ''"
 
-  local f = assert(io.popen(cmd, 'r'))
-  local pages = assert(f:read('*a'))
-  f:close()
+  local pages = utils.get_os_command_output(cmd)
 
   local lines = {}
   for s in pages:gmatch("[^\r\n]+") do

lua/telescope/previewers.lua

@@ -21,7 +21,15 @@ Previewer.__index = Previewer
 local bat_options = {"--style=plain", "--color=always", "--paging=always"}
 local has_less = (vim.fn.executable('less') == 1) and config.values.use_less
 
+local get_file_stat = function(filename)
+  return assert(vim.loop.fs_stat(vim.fn.expand(filename)))
+end
+
 local bat_maker = function(filename, lnum, start, finish)
+  if get_file_stat(filename).type == 'directory' then
+    return { 'ls', '-la' }
+  end
+
   local command = {"bat"}
   local theme = os.getenv("BAT_THEME")
 
@@ -46,23 +54,26 @@ local bat_maker = function(filename, lnum, start, finish)
   end
 
   return flatten {
-    command, bat_options, "--", filename
+    command, bat_options, "--", vim.fn.expand(filename)
   }
 end
 
 -- TODO: Add other options for cat to do this better
 local cat_maker = function(filename, _, _, _)
-  if vim.fn.executable('file') then
-    local handle = io.popen('file --mime-type -b ' .. filename)
-    local mime_type = vim.split(handle:read('*a'), '/')[1]
-    handle:close()
+  if get_file_stat(filename).type == 'directory' then
+    return { 'ls', '-la' }
+  end
+
+  if 1 == vim.fn.executable('file') then
+    local output = utils.get_os_command_output('file --mime-type -b ' .. filename)
+    local mime_type = vim.split(output, '/')[1]
     if mime_type ~= "text" then
       return { "echo", "Binary file found. These files cannot be displayed!" }
     end
   end
 
   return {
-    "cat", "--", filename
+    "cat", "--", vim.fn.expand(filename)
   }
 end
 

lua/telescope/utils.lua

@@ -190,4 +190,11 @@ function utils.display_termcodes(str)
   return str:gsub(string.char(9), "<TAB>"):gsub("", "<C-F>"):gsub(" ", "<Space>")
 end
 
+function utils.get_os_command_output(cmd)
+  local handle = assert(io.popen(cmd, 'r'))
+  local output = assert(handle:read('*a'))
+  assert(handle:close())
+  return output
+end
+
 return utils