Generate config docs from lemmy code

.drone.yml

@@ -5,6 +5,4 @@ steps:
   - name: check documentation build
     image: rust:1.49-slim-buster
     commands:
-      - cargo install mdbook --git https://github.com/Nutomic/mdBook.git --branch localization
-            --rev 0982a82 --force --debug
-      - mdbook build .
+      - build.sh

.gitignore

@@ -1 +1,2 @@
 book
+generated

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "lemmy"]
+	path = lemmy
+	url = https://github.com/LemmyNet/lemmy.git

README.md

@@ -9,8 +9,7 @@ You need to have [Cargo](https://doc.rust-lang.org/cargo/) installed.
 Our documentation tool [mdbook](https://github.com/rust-lang/mdBook) doesn't support localisation yet, so we are using code that is still work on progress to create our documentation with localisation. Note that this code still has some rough edges. See [github.com/rust-lang/mdBook/pull/1306](https://github.com/rust-lang/mdBook/pull/1306) for more details.
 
 ```bash
-cargo install mdbook --git https://github.com/Ruin0x11/mdBook.git \
-    --branch localization --rev d06249b
+./build.sh
 # generate static page in `book` subfolder
 mdbook build
 # serve the book at `http://localhost:3000`, and rebuilds on changes

build.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+set -e
+
+# generate config docs
+pushd lemmy
+mkdir ../generated
+cargo run -- --print-config-docs >> ../generated/config.hjson
+# replace // comments with #
+sed -i "s/\/\//#/" ../generated/config.hjson
+# remove trailing commas
+sed -i "s/,\$//" ../generated/config.hjson
+# remove quotes around json keys
+sed -i "s/\"//" ../generated/config.hjson
+sed -i "s/\"//" ../generated/config.hjson
+popd
+
+cargo install mdbook --git https://github.com/Nutomic/mdBook.git --branch localization \
+    --rev 0982a82
+mdbook build .

src/en/administration/configuration.md

@@ -1,8 +1,6 @@
 # Configuration
 
-The configuration is based on the file [config.hjson](https://github.com/lemmynet/lemmy/blob/main/config/config.hjson). This file also contains documentation for all the available options. The install instructions tell you how to override the defaults.
-
-The `config.hjson` file is located at `config/config.hjson`. To change the default location, you can set the environment variable `LEMMY_CONFIG_LOCATION`.
+The configuration is based on the file config.hjson, which is located by default at `config/config.hjson`. To change the default location, you can set the environment variable `LEMMY_CONFIG_LOCATION`.
 
 An additional environment variable `LEMMY_DATABASE_URL` is available, which can be used with a PostgreSQL connection string like `postgres://lemmy:password@lemmy_db:5432/lemmy`, passing all connection details at once.
 
@@ -14,3 +12,9 @@ cd server
 ```
 
 **Federation is not set up by default.** You can add this [this federation block](https://github.com/lemmynet/lemmy/blob/main/config/config.hjson#L64) to your `lemmy.hjson`, and ask other servers to add you to their allowlist.
+
+## Full config with default values
+
+```hjson
+{{#include ../../../generated/config.hjson}}
+```