docs: use README as a source for the docs

README.md

@@ -12,6 +12,8 @@
 - [Quick set up tutorial](https://www.youtube.com/watch?v=b641h63lqy0) (by [@Vimjoyer](https://www.youtube.com/@vimjoyer))
 - [Nixvim: How to configure Neovim with the power of Nix](https://www.youtube.com/watch?v=GOe0C7Qtypk) (NeovimConf 2023 talk by [@GaetanLepage](https://glepage.com/))
 
+<!-- START DOCS -->
+
 ## What is it?
 NixVim is a [Neovim](https://neovim.io) distribution built around
 [Nix](https://nixos.org) modules. It is distributed as a Nix flake, and
@@ -37,6 +39,8 @@ catppuccin as the colorscheme, no extra configuration required!
 
 Check out [this list of real world nixvim configs](https://nix-community.github.io/nixvim/user-guide/config-examples.html)!
 
+<!-- STOP DOCS -->
+
 ## How does it work?
 When you build the module (probably using home-manager), it will install all
 your plugins and generate a lua config for NeoVim with all the options

docs/mdbook/default.nix

@@ -347,6 +347,7 @@ pkgs.stdenv.mkDerivation (finalAttrs: {
 
     # Patch index.md
     substituteInPlace ./index.md \
+      --replace-fail "@README@" "$(cat ${finalAttrs.passthru.readme})" \
       --replace-fail "@DOCS_VERSIONS@" "$(cat ${finalAttrs.passthru.docs-versions})"
 
     # Patch user-configs
@@ -369,6 +370,21 @@ pkgs.stdenv.mkDerivation (finalAttrs: {
 
   passthru = {
     copy-docs = pkgs.writeShellScript "copy-docs" docs.commands;
+    readme =
+      runCommand "readme"
+        {
+          start = "<!-- START DOCS -->";
+          end = "<!-- STOP DOCS -->";
+          baseurl = "https://nix-community.github.io/nixvim/";
+          src = ../../README.md;
+        }
+        ''
+          # extract relevant section of the README
+          sed -n "/$start/,/$end/p" $src > $out
+          # replace absolute links
+          substituteInPlace $out --replace-quiet "$baseurl" "./"
+          # TODO: replace .html with .md
+        '';
     search = search.override {
       baseHref = finalAttrs.baseHref + "search/";
     };

docs/mdbook/index.md

@@ -16,30 +16,7 @@ Documentation is currently available for the following versions:
 >
 > The old behaviour can be restored by enabling `nixpkgs.useGlobalPackages`.
 
-## What is it?
+@README@
-NixVim is a [Neovim](https://neovim.io) distribution built around
-[Nix](https://nixos.org) modules. It is distributed as a Nix flake, and
-configured through Nix, all while leaving room for your plugins and your vimrc.
-
-## What does it look like?
-Here is a simple configuration that uses catppuccin as the colorscheme and uses the
-lualine plugin:
-
-```nix
-{
-  programs.nixvim = {
-    enable = true;
-
-    colorschemes.catppuccin.enable = true;
-    plugins.lualine.enable = true;
-  };
-}
-```
-
-When we do this, lualine will be set up to a sensible default, and will use
-catppuccin as the colorscheme, no extra configuration required!
-
-Check out [this list of real world nixvim configs](./user-guide/config-examples.md)!
 
 ## Welcome to the docs!