vim: Don't rustfmt without an explicit config

This is getting annoying when contributing to external projects that
don't have a rustfmt.toml, because I constantly forget to disable it for
a buffer and then get a massive diff that I need to revert.

My own projects all have a rustfmt.toml anyway, so there really is no
reason to do it by default nor have a custom rustfmt config in Vuizvui.

Signed-off-by: aszlig <aszlig@nix.build>

1 files changed, 4 insertions, 2 deletions

diff --git a/pkgs/aszlig/vim/default.nix b/pkgs/aszlig/vim/default.nix
index 4bbc8107..641c39ea 100644
--- a/pkgs/aszlig/vim/default.nix
+++ b/pkgs/aszlig/vim/default.nix
@@ -604,8 +604,10 @@ let
     if !executable('rustc')
       let g:rustc_path = '${rustc}/bin/rustc'
     endif
-    let g:rustfmt_command = '${rustfmt}/bin/rustfmt'
-    let g:rustfmt_autosave = 1
+    let g:rustfmt_command = '${rustfmt.override {
+      asNightly = true;
+    }}/bin/rustfmt'
+    let g:rustfmt_autosave_if_config_present = 1
     let g:rust_recommended_style = 0
   '';