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, 1 deletions

diff --git a/expand.h b/expand.h
index 56ac7915..82fdc688 100644
--- a/expand.h
+++ b/expand.h
@@ -165,11 +165,12 @@ __warn_unused int expand_string2( const wcstring &input, std::list<wcstring> &ou
 wchar_t *expand_one( void *context, wchar_t *in, int flag );
 
 /**
-   Convert the variable value to a human readable form, i.e. escape things, handle arrays, etc. Suitable for pretty-printing.
+   Convert the variable value to a human readable form, i.e. escape things, handle arrays, etc. Suitable for pretty-printing. The result must be free'd!
 
    \param in the value to escape
 */
 wchar_t *expand_escape_variable( const wchar_t *in );
+wcstring expand_escape_variable2( const wcstring &in );
 
 /**
    Perform tilde expansion and nothing else on the specified string, which is modified in place.