vim: add one theme and use it

.gitmodules

@@ -28,3 +28,6 @@
 [submodule "vim/pack/adrien/start/vim-furchtig"]
 	path = vim/pack/adrien/start/vim-furchtig
 	url = https://github.com/schickele/vim-fruchtig.git
+[submodule "vim/pack/adrien/start/vim-one"]
+	path = vim/pack/adrien/start/vim-one
+	url = https://github.com/rakr/vim-one

vim-one @ 187f5c85

+Subproject commit 187f5c85b682c1933f8780d4d419c55d26a82e24

vim/vimrc

@@ -40,15 +40,21 @@ endif
 
 " Themes
 syntax on
-if strftime("%H") > 7 && strftime("%H") < 18
-  colorscheme fruchtig
-else
+let gtktheme = system('gsettings get org.gnome.desktop.interface gtk-theme')
+if gtktheme =~"Adwaita-dark"
   colorscheme OceanicNext
+  colorscheme one
+  set background=dark
+else
+  colorscheme fruchtig
+  colorscheme one
+  set background=light
 end
 
 if (has("termguicolors"))
   set termguicolors
 endif
+let g:one_allow_italics = 1
 let g:oceanic_next_terminal_bold = 1
 let g:oceanic_next_terminal_italic = 1