switch vim flavour to Neovim; reason: macOS clipboard support

access to system clipboard was broken in command-line vim, the buffers
"+ or "* were said not to exist and neither unnamed or unnamedplus
clipboard settings were working.

Aliases nvim to "vim"

home/home.nix

@@ -440,8 +440,9 @@ in
       ipb = "ip --color --brief";
       ll = "ls -l";
       wavesynth = "nix-shell -p sox --run 'play -n synth brownnoise synth pinknoise mix synth 0 0 0 15 40 80 trapezium amod 0.2 20'";
+      vim = "nvim";
     };
     home.sessionVariables = {
-      EDITOR = "vim";
+      EDITOR = "nvim";
     };
 }

home/overlays.nix

@@ -4,10 +4,8 @@
     self: super:
       rec {
         #jami-ring-daemon = super.qt5.callPackage ./ov/jami/ring-daemon.nix {};
-        myVim = with super; (vim_configurable.override { python = python3; }).customize {
-          # executable/ package name
-          name = "vim";
-          vimrcConfig.packages.myVimPackage = with pkgs.vimPlugins; {
+        myVim = with super; neovim.override { configure = {
+          packages.myVimPackage = with pkgs.vimPlugins; {
             # loaded on start
             start = [
               ale
@@ -27,8 +25,8 @@
               vim-jinja
             ];
           };
-          vimrcConfig.customRC = builtins.readFile ./vimrc;
-        };
+          customRC = builtins.readFile ./vimrc;
+        };};
         # build with debug symbols and in debug mode (less optimized)
         opencvDebug = with super; enableDebugging ((opencv3.override { enablePython = true; enableGtk3 = true; enableDocs = true; pythonPackages = pkgs.python3Packages; }).overrideAttrs (oldAttrs: rec { cmakeBuildType = "Debug"; }));
         #gnutls = super.callPackage ./ov/gnutls {inherit (super.darwin.apple_sdk.frameworks) Security;};

home/vimrc

@@ -36,11 +36,8 @@ set incsearch
 set autoindent
 set history=1000
 " set cursorline
-if has("unnamedplus")
-  set clipboard=unnamedplus
-elseif has("clipboard")
-  set clipboard=unnamed
-endif
+" use system clipboard as default buffer
+set clipboard=unnamed
 
 " set expandtab
 set shiftwidth=4
@@ -101,7 +98,7 @@ au FileType nix setlocal tabstop=2 expandtab shiftwidth=2 softtabstop=2
 set ofu=syntaxcomplete#Complete
 " nmap <C-V> "+gP
 " imap <C-V> <ESC><C-V>a
-vmap <C-C> "+y 
+"vmap <C-C> "+y 
 
 " ALE linter settings
 let g:ale_linters = { 'python': ['flake8'] }