Redesign new environment variables to use env_var_t instead of wcstring

Migrate uses of empty() to missing() to distinguish between empty variable and unset variable

1 files changed, 2 insertions, 2 deletions

diff --git a/screen.cpp b/screen.cpp
index f4bc39bb..eb8bcc82 100644
--- a/screen.cpp
+++ b/screen.cpp
@@ -204,8 +204,8 @@ static int calc_prompt_width( const wchar_t *prompt )
 			{
 				if( prompt[j+1] == L'k' )
 				{
-					wcstring term_name = env_get_string( L"TERM" );
-					if( !term_name.empty() && wcsstr( term_name.c_str(), L"screen" ) == term_name )
+					const env_var_t term_name = env_get_string( L"TERM" );
+					if( !term_name.missing() && wcsstr( term_name.c_str(), L"screen" ) == term_name )
 					{
 						const wchar_t *end;
 						j+=2;