Canonicalize some wide string imports

wchar.rs should not import let alone reexport FFI strings.
Stop re-exporting utf32str! because we use L! instead.

In wchar_ffi.rs, stop re-exporting cxx::CxxWString because that hasn't
seen adoption.

I think we should use re-exports only for aliases like "wstr" or for aliases
into internal modules.
So I'd probably remove `pub use wchar_ffi::wcharz_t = crate::ffi::wcharz_t`
as well.

fish-rust/src/builtins/emit.rs

@@ -5,7 +5,8 @@ use super::shared::{
     builtin_print_help, io_streams_t, HelpOnlyCmdOpts, STATUS_CMD_OK, STATUS_INVALID_ARGS,
 };
 use crate::ffi::{self, parser_t, Repin};
-use crate::wchar_ffi::{wstr, W0String, WCharToFFI};
+use crate::wchar::wstr;
+use crate::wchar_ffi::{W0String, WCharToFFI};
 use crate::wutil::format::printf::sprintf;
 
 #[widestrs]

fish-rust/src/common.rs

@@ -1,7 +1,8 @@
 use crate::ffi;
+use crate::wchar::{wstr, WString};
 use crate::wchar_ext::WExt;
 use crate::wchar_ffi::c_str;
-use crate::wchar_ffi::{wstr, WCharFromFFI, WString};
+use crate::wchar_ffi::WCharFromFFI;
 use std::os::fd::AsRawFd;
 use std::{ffi::c_uint, mem};
 

fish-rust/src/redirection.rs

@@ -1,7 +1,8 @@
 //! This file supports specifying and applying redirections.
 
-use crate::wchar::L;
-use crate::wchar_ffi::{wcharz_t, WCharToFFI, WString};
+use crate::ffi::wcharz_t;
+use crate::wchar::{WString, L};
+use crate::wchar_ffi::WCharToFFI;
 use crate::wutil::fish_wcstoi;
 use cxx::{CxxVector, CxxWString, SharedPtr, UniquePtr};
 use libc::{c_int, O_APPEND, O_CREAT, O_EXCL, O_RDONLY, O_TRUNC, O_WRONLY};

fish-rust/src/signal.rs

@@ -1,6 +1,7 @@
 use crate::ffi;
 use crate::topic_monitor::{generation_t, invalid_generations, topic_monitor_principal, topic_t};
-use crate::wchar_ffi::{c_str, wstr};
+use crate::wchar::wstr;
+use crate::wchar_ffi::c_str;
 use widestring::U32CStr;
 
 /// A sigint_detector_t can be used to check if a SIGINT (or SIGHUP) has been delivered.

fish-rust/src/tokenizer.rs

@@ -5,8 +5,8 @@ use crate::ffi::{valid_var_name_char, wcharz_t};
 use crate::future_feature_flags::{feature_test, FeatureFlag};
 use crate::parse_constants::SOURCE_OFFSET_INVALID;
 use crate::redirection::RedirectionMode;
-use crate::wchar::{WExt, L};
-use crate::wchar_ffi::{wchar_t, wstr, WCharFromFFI, WCharToFFI, WString};
+use crate::wchar::{wstr, WExt, WString, L};
+use crate::wchar_ffi::{wchar_t, WCharFromFFI, WCharToFFI};
 use crate::wutil::wgettext;
 use cxx::{CxxWString, SharedPtr, UniquePtr};
 use libc::{c_int, STDIN_FILENO, STDOUT_FILENO};

fish-rust/src/wchar.rs

@@ -4,10 +4,6 @@
 //!   - wstr: a string slice without a nul terminator. Like `&str` but wide chars.
 //!   - WString: an owning string without a nul terminator. Like `String` but wide chars.
 
-use crate::ffi;
-pub use cxx::CxxWString;
-pub use ffi::{wchar_t, wcharz_t};
-pub use widestring::utf32str;
 pub use widestring::{Utf32Str as wstr, Utf32String as WString};
 
 /// Creates a wstr string slice, like the "L" prefix of C++.

fish-rust/src/wchar_ffi.rs

@@ -6,13 +6,11 @@
 //!   - wcharz_t: a "newtyped" pointer to a nul-terminated string, implemented in C++.
 //!               This is useful for FFI boundaries, to work around autocxx limitations on pointers.
 
-use crate::ffi;
-pub use cxx::CxxWString;
-pub use ffi::{wchar_t, wcharz_t};
+pub use crate::ffi::{wchar_t, wcharz_t};
+use crate::wchar::{wstr, WString};
 use once_cell::sync::Lazy;
+pub use widestring::u32cstr;
 pub use widestring::U32CString as W0String;
-pub use widestring::{u32cstr, utf32str};
-pub use widestring::{Utf32Str as wstr, Utf32String as WString};
 
 /// \return the length of a nul-terminated raw string.
 pub fn wcslen(str: *const wchar_t) -> usize {
@@ -64,7 +62,7 @@ macro_rules! c_str {
 /// Convert a wstr to a wcharz_t.
 macro_rules! wcharz {
     ($string:expr) => {
-        crate::wchar::wcharz_t {
+        crate::wchar_ffi::wcharz_t {
             str_: crate::wchar_ffi::c_str!($string),
         }
     };

fish-rust/src/wgetopt.rs

@@ -23,7 +23,7 @@ License along with the GNU C Library; see the file COPYING.LIB.  If
 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
 Cambridge, MA 02139, USA.  */
 
-use crate::wchar::{utf32str, wstr, WExt};
+use crate::wchar::{wstr, WExt, L};
 
 /// Describe how to deal with options that follow non-option ARGV-elements.
 ///
@@ -344,7 +344,7 @@ impl<'opts, 'args, 'argarray> wgetopter_t<'opts, 'args, 'argarray> {
 
         let temp = match self.shortopts.chars().position(|sc| sc == c) {
             Some(pos) => &self.shortopts[pos..],
-            None => utf32str!(""),
+            None => L!(""),
         };
 
         // Increment `woptind' when we start to process its last character.

fish-rust/src/wutil/gettext.rs

@@ -1,6 +1,6 @@
 use crate::ffi;
-use crate::wchar::{wchar_t, wstr};
-use crate::wchar_ffi::wcslen;
+use crate::wchar::wstr;
+use crate::wchar_ffi::{wchar_t, wcslen};
 
 /// Support for wgettext.