Added Linux vs Darwin differences for vim/nvim

.local/dotfiles/aliases/gvim.zsh

@@ -1,6 +1,14 @@
-if whence -p nvim-gtk > /dev/null; then
-  alias vim=nvim-gtk
-elif whence -p gvim > /dev/null; then
-  alias vim=gvim
-fi
+case `uname` in
+  Linux)
+    if whence -p nvim-gtk > /dev/null; then
+      alias vim=nvim-gtk
+    elif whence -p gvim > /dev/null; then
+      alias vim=gvim
+    fi
+    ;;
+  Darwin)
+    if whence -p nvim > /dev/null; then
+      alias vim=nvim
+    fi
+esac
 

.local/dotfiles/environment/core.zsh

@@ -1,6 +1,17 @@
+case `uname` in
+  Linux)
+    EDITOR=vim
+    VISUAL=vim
+    ;;
+  Darwin)
+    EDITOR=nvim
+    VISUAL=nvim
+    ;;
+esac
+
 # Default Environment
-export EDITOR=vim
-export VISUAL=vim
+export EDITOR
+export VISUAL
 export PAGER=less
 export VIMINIT=":set runtimepath^=$HOME/.SpaceVim|:source $HOME/.SpaceVim/vimrc"
 export SPACEVIMDIR="$HOME/.SpaceVim.d/"