From 01f2879e10ba493e4d1bc4f618f07e8aa7e24ea4 Mon Sep 17 00:00:00 2001
From: Jan-Erik Rediger <janerik@fnordig.de>
Date: Wed, 6 Jan 2021 14:27:35 +0100
Subject: [PATCH 1/6] cargo fmt

---
 src/lib.rs | 38 ++++++++++++--------------------------
 1 file changed, 12 insertions(+), 26 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index a6c3f50..931d319 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,6 +1,7 @@
 use std::cmp::Ordering;
 use std::collections::HashMap;
 use std::fmt::Write;
+
 use mdbook::book::{Book, BookItem, Chapter};
 use mdbook::errors::{Error, Result};
 use mdbook::preprocess::{Preprocessor, PreprocessorContext};
@@ -67,7 +68,7 @@ fn build_toc(toc: &[(u32, String, String)]) -> String {
     // Start from the level of the first header.
     let mut last_lower = match toc_iter.peek() {
         Some((lvl, _, _)) => *lvl,
-        None => 0
+        None => 0,
     };
     let toc = toc.iter().map(|(lvl, name, slug)| {
         let lvl = *lvl;
@@ -190,7 +191,10 @@ fn add_toc(content: &str, marker: &str) -> Result<String> {
         })
         .flatten();
 
-    let opts = COptions { newlines_after_codeblock: 1, ..Default::default() };
+    let opts = COptions {
+        newlines_after_codeblock: 1,
+        ..Default::default()
+    };
     cmark_with_options(events, &mut buf, None, opts)
         .map(|_| buf)
         .map_err(|err| Error::msg(format!("Markdown serialization failed: {}", err)))
@@ -248,10 +252,7 @@ mod test {
 
 ### Header 2.2.1"#;
 
-        assert_eq!(
-            expected,
-            add_toc(content, DEFAULT_MARKER).unwrap()
-        );
+        assert_eq!(expected, add_toc(content, DEFAULT_MARKER).unwrap());
     }
 
     #[test]
@@ -284,10 +285,7 @@ mod test {
 
 ## Header 2.1"#;
 
-        assert_eq!(
-            expected,
-            add_toc(content, DEFAULT_MARKER).unwrap()
-        );
+        assert_eq!(expected, add_toc(content, DEFAULT_MARKER).unwrap());
     }
 
     #[test]
@@ -309,10 +307,7 @@ mod test {
 |------|------|
 |Row 1|Row 2|"#;
 
-        assert_eq!(
-            expected,
-            add_toc(content, DEFAULT_MARKER).unwrap()
-        );
+        assert_eq!(expected, add_toc(content, DEFAULT_MARKER).unwrap());
     }
 
     #[test]
@@ -361,10 +356,7 @@ mod test {
 
 # Another header `with inline` code"#;
 
-        assert_eq!(
-            expected,
-            add_toc(content, DEFAULT_MARKER).unwrap()
-        );
+        assert_eq!(expected, add_toc(content, DEFAULT_MARKER).unwrap());
     }
 
     #[test]
@@ -411,10 +403,7 @@ mod test {
 
 ## User Preferences"#;
 
-        assert_eq!(
-            expected,
-            add_toc(content, DEFAULT_MARKER).unwrap()
-        );
+        assert_eq!(expected, add_toc(content, DEFAULT_MARKER).unwrap());
     }
 
     #[test]
@@ -451,10 +440,7 @@ text"#;
 
 text"#;
 
-        assert_eq!(
-            expected,
-            add_toc(content, DEFAULT_MARKER).unwrap()
-        );
+        assert_eq!(expected, add_toc(content, DEFAULT_MARKER).unwrap());
     }
 
     #[test]

From 6e8b632a303f02db87ea3c7738df776a1fab02ff Mon Sep 17 00:00:00 2001
From: Jan-Erik Rediger <janerik@fnordig.de>
Date: Wed, 6 Jan 2021 14:28:21 +0100
Subject: [PATCH 2/6] Refactor: parse config in a central place

---
 Cargo.lock | 1235 ++++++++++++++++++++++++++--------------------------
 Cargo.toml |    1 +
 src/lib.rs |   61 ++-
 3 files changed, 661 insertions(+), 636 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 15c1b75..5477e6d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4,1817 +4,1816 @@
 name = "aho-corasick"
 version = "0.7.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "043164d8ba5c4c3035fec9bbee8647c0261d788f3474306f93bb65901cae0e86"
 dependencies = [
- "memchr 2.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr",
 ]
 
 [[package]]
 name = "ammonia"
 version = "3.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "89eac85170f4b3fb3dc5e442c1cfb036cb8eecf9dbbd431a161ffad15d90ea3b"
 dependencies = [
- "html5ever 0.25.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "maplit 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "markup5ever_rcdom 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "matches 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "tendril 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 2.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "html5ever",
+ "lazy_static",
+ "maplit",
+ "markup5ever_rcdom",
+ "matches",
+ "tendril",
+ "url",
 ]
 
 [[package]]
 name = "ansi_term"
 version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ee49baf6cb617b853aa8d93bf420db2383fab46d314482ca2803b40d5fde979b"
 dependencies = [
- "winapi 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.9",
 ]
 
 [[package]]
 name = "anyhow"
 version = "1.0.32"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6b602bfe940d21c130f3895acd65221e8a61270debe89d628b9cb4e3ccb8569b"
 
 [[package]]
 name = "atty"
 version = "0.2.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8"
 dependencies = [
- "hermit-abi 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.77 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hermit-abi",
+ "libc",
+ "winapi 0.3.9",
 ]
 
 [[package]]
 name = "autocfg"
 version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cdb031dd78e28731d87d56cc8ffef4a8f36ca26c38fe2de700543e627f8a464a"
 
 [[package]]
 name = "base64"
 version = "0.12.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3441f0f7b02788e948e47f457ca01f1d7e6d92c693bc132c22b087d3141c03ff"
 
 [[package]]
 name = "bitflags"
 version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
 
 [[package]]
 name = "block-buffer"
 version = "0.7.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c0940dc441f31689269e10ac70eb1002a3a1d3ad1390e030043662eb7fe4688b"
 dependencies = [
- "block-padding 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "byte-tools 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "byteorder 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "generic-array 0.12.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "block-padding",
+ "byte-tools",
+ "byteorder",
+ "generic-array 0.12.3",
 ]
 
 [[package]]
 name = "block-buffer"
 version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4152116fd6e9dadb291ae18fc1ec3575ed6d84c29642d97890f4b4a3417297e4"
 dependencies = [
- "generic-array 0.14.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "generic-array 0.14.4",
 ]
 
 [[package]]
 name = "block-padding"
 version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fa79dedbb091f449f1f39e53edf88d5dbe95f895dae6135a8d7b881fb5af73f5"
 dependencies = [
- "byte-tools 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byte-tools",
 ]
 
 [[package]]
 name = "byte-tools"
 version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3b5ca7a04898ad4bcd41c90c5285445ff5b791899bb1b0abdd2a2aa791211d7"
 
 [[package]]
 name = "byteorder"
 version = "1.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "08c48aae112d48ed9f069b33538ea9e3e90aa263cfa3d1c24309612b1f7472de"
 
 [[package]]
 name = "bytes"
 version = "0.5.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0e4cec68f03f32e44924783795810fa50a7035d8c8ebe78580ad7e6c703fba38"
 
 [[package]]
 name = "cfg-if"
 version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"
 
 [[package]]
 name = "chrono"
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+checksum = "d021fddb7bd3e734370acfa4a83f34095571d8570c039f1420d77540f68d5772"
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- "num-traits 0.2.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "time 0.1.44 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc",
+ "num-integer",
+ "num-traits",
+ "time",
+ "winapi 0.3.9",
 ]
 
 [[package]]
 name = "clap"
 version = "2.33.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "37e58ac78573c40708d45522f0d80fa2f01cc4f9b4e2bf749807255454312002"
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- "ansi_term 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
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- "bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "strsim 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "textwrap 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "unicode-width 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "vec_map 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ansi_term",
+ "atty",
+ "bitflags",
+ "strsim",
+ "textwrap",
+ "unicode-width",
+ "vec_map",
 ]
 
 [[package]]
 name = "cpuid-bool"
 version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8aebca1129a03dc6dc2b127edd729435bbc4a37e1d5f4d7513165089ceb02634"
 
 [[package]]
 name = "ctor"
 version = "0.1.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7fbaabec2c953050352311293be5c6aba8e141ba19d6811862b232d6fd020484"
 dependencies = [
- "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.42 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote",
+ "syn",
 ]
 
 [[package]]
 name = "difference"
 version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "524cbf6897b527295dff137cec09ecf3a05f4fddffd7dfcd1585403449e74198"
 
 [[package]]
 name = "digest"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f3d0c8c8752312f9713efd397ff63acb9f85585afbf179282e720e7704954dd5"
 dependencies = [
- "generic-array 0.12.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "generic-array 0.12.3",
 ]
 
 [[package]]
 name = "digest"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d3dd60d1080a57a05ab032377049e0591415d2b31afd7028356dbf3cc6dcb066"
 dependencies = [
- "generic-array 0.14.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "generic-array 0.14.4",
 ]
 
 [[package]]
 name = "dtoa"
 version = "0.4.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "134951f4028bdadb9b84baf4232681efbf277da25144b9b0ad65df75946c422b"
 
 [[package]]
 name = "elasticlunr-rs"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "35622eb004c8f0c5e7e2032815f3314a93df0db30a1ce5c94e62c1ecc81e22b9"
 dependencies = [
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- "regex 1.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.116 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.116 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.57 (registry+https://github.com/rust-lang/crates.io-index)",
- "strum 0.18.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "strum_macros 0.18.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static",
+ "regex",
+ "serde",
+ "serde_derive",
+ "serde_json",
+ "strum",
+ "strum_macros",
 ]
 
 [[package]]
 name = "env_logger"
 version = "0.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "44533bbbb3bb3c1fa17d9f2e4e38bbbaf8396ba82193c4cb1b6445d711445d36"
 dependencies = [
- "atty 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
- "humantime 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 1.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "termcolor 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "atty",
+ "humantime",
+ "log",
+ "regex",
+ "termcolor",
 ]
 
 [[package]]
 name = "fake-simd"
 version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e88a8acf291dafb59c2d96e8f59828f3838bb1a70398823ade51a84de6a6deed"
 
 [[package]]
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 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3ed85775dcc68644b5c950ac06a2b23768d3bc9390464151aaf27136998dcf9e"
 dependencies = [
- "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.77 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.57 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if",
+ "libc",
+ "redox_syscall",
+ "winapi 0.3.9",
 ]
 
 [[package]]
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 version = "1.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
 
 [[package]]
 name = "fsevent"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5ab7d1bd1bd33cc98b0889831b72da23c0aa4df9cec7e0702f46ecea04b35db6"
 dependencies = [
- "bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "fsevent-sys 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitflags",
+ "fsevent-sys",
 ]
 
 [[package]]
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 version = "2.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f41b048a94555da0f42f1d632e2e19510084fb8e303b0daa2816e733fb3644a0"
 dependencies = [
- "libc 0.2.77 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc",
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 [[package]]
 name = "fuchsia-zircon"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2e9763c69ebaae630ba35f74888db465e49e259ba1bc0eda7d06f4a067615d82"
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- "fuchsia-zircon-sys 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitflags",
+ "fuchsia-zircon-sys",
 ]
 
 [[package]]
 name = "fuchsia-zircon-sys"
 version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3dcaa9ae7725d12cdb85b3ad99a434db70b468c09ded17e012d86b5c1010f7a7"
 
 [[package]]
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- "new_debug_unreachable 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mac",
+ "new_debug_unreachable",
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 [[package]]
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 version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e05b85ec287aac0dc34db7d4a569323df697f9c55b99b15d6b4ef8cde49f613"
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- "futures-util 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-channel",
+ "futures-core",
+ "futures-io",
+ "futures-sink",
+ "futures-task",
+ "futures-util",
 ]
 
 [[package]]
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+checksum = "f366ad74c28cca6ba456d95e6422883cfb4b252a83bed929c83abfdbbf2967d5"
 dependencies = [
- "futures-core 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-sink 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-core",
+ "futures-sink",
 ]
 
 [[package]]
 name = "futures-core"
 version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "59f5fff90fd5d971f936ad674802482ba441b6f09ba5e15fd8b39145582ca399"
 
 [[package]]
 name = "futures-io"
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+checksum = "de27142b013a8e869c14957e6d2edeef89e97c289e69d042ee3a49acd8b51789"
 
 [[package]]
 name = "futures-macro"
 version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d0b5a30a4328ab5473878237c447333c093297bded83a4983d10f4deea240d39"
 dependencies = [
- "proc-macro-hack 0.5.18 (registry+https://github.com/rust-lang/crates.io-index)",
- "proc-macro2 1.0.23 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.42 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro-hack",
+ "proc-macro2",
+ "quote",
+ "syn",
 ]
 
 [[package]]
 name = "futures-sink"
 version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f2032893cb734c7a05d85ce0cc8b8c4075278e93b24b66f9de99d6eb0fa8acc"
 
 [[package]]
 name = "futures-task"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
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diff --git a/Cargo.toml b/Cargo.toml
index d4af554..3f4dc76 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,6 +16,7 @@ env_logger = "0.7.1"
 log = "0.4.11"
 clap = "2.33.3"
 serde_json = "1.0.57"
+toml = "0.5.6"
 
 [dev-dependencies]
 pretty_assertions = "0.6.1"
diff --git a/src/lib.rs b/src/lib.rs
index 931d319..63fca7b 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,5 +1,6 @@
 use std::cmp::Ordering;
 use std::collections::HashMap;
+use std::convert::TryFrom;
 use std::fmt::Write;
 
 use mdbook::book::{Book, BookItem, Chapter};
@@ -8,11 +9,51 @@ use mdbook::preprocess::{Preprocessor, PreprocessorContext};
 use pulldown_cmark::Tag::*;
 use pulldown_cmark::{Event, Options, Parser};
 use pulldown_cmark_to_cmark::{cmark_with_options, Options as COptions};
+use toml::value::Table;
 
 pub struct Toc;
 
 static DEFAULT_MARKER: &str = "<!-- toc -->\n";
 
+struct Config {
+    marker: String,
+}
+
+impl Default for Config {
+    fn default() -> Config {
+        Config {
+            marker: DEFAULT_MARKER.into(),
+        }
+    }
+}
+
+impl<'a> TryFrom<Option<&'a Table>> for Config {
+    type Error = Error;
+
+    fn try_from(mdbook_cfg: Option<&Table>) -> Result<Config> {
+        let mut cfg = Config::default();
+        let mdbook_cfg = match mdbook_cfg {
+            Some(c) => c,
+            None => return Ok(cfg),
+        };
+
+        if let Some(marker) = mdbook_cfg.get("marker") {
+            let marker = match marker.as_str() {
+                Some(m) => m,
+                None => {
+                    return Err(Error::msg(format!(
+                        "Marker {:?} is not a valid string",
+                        marker
+                    )))
+                }
+            };
+            cfg.marker = marker.into();
+        }
+
+        Ok(cfg)
+    }
+}
+
 impl Preprocessor for Toc {
     fn name(&self) -> &str {
         "toc"
@@ -20,23 +61,7 @@ impl Preprocessor for Toc {
 
     fn run(&self, ctx: &PreprocessorContext, mut book: Book) -> Result<Book> {
         let mut res = None;
-        let toc_marker = if let Some(cfg) = ctx.config.get_preprocessor(self.name()) {
-            if let Some(marker) = cfg.get("marker") {
-                match marker.as_str() {
-                    Some(m) => m,
-                    None => {
-                        return Err(Error::msg(format!(
-                            "Marker {:?} is not a valid string",
-                            marker
-                        )))
-                    }
-                }
-            } else {
-                DEFAULT_MARKER
-            }
-        } else {
-            DEFAULT_MARKER
-        };
+        let cfg = ctx.config.get_preprocessor(self.name()).try_into()?;
 
         book.for_each_mut(|item: &mut BookItem| {
             if let Some(Err(_)) = res {
@@ -44,7 +69,7 @@ impl Preprocessor for Toc {
             }
 
             if let BookItem::Chapter(ref mut chapter) = *item {
-                res = Some(Toc::add_toc(chapter, &toc_marker).map(|md| {
+                res = Some(Toc::add_toc(chapter, &cfg.marker).map(|md| {
                     chapter.content = md;
                 }));
             }

From 8916d17e4b77ef2d199128014da80c4a34cb17fe Mon Sep 17 00:00:00 2001
From: Jan-Erik Rediger <janerik@fnordig.de>
Date: Wed, 6 Jan 2021 14:39:52 +0100
Subject: [PATCH 3/6] Parse max-level

---
 src/lib.rs | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/lib.rs b/src/lib.rs
index 63fca7b..eee96bd 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -17,12 +17,14 @@ static DEFAULT_MARKER: &str = "<!-- toc -->\n";
 
 struct Config {
     marker: String,
+    max_level: u32,
 }
 
 impl Default for Config {
     fn default() -> Config {
         Config {
             marker: DEFAULT_MARKER.into(),
+            max_level: 4,
         }
     }
 }
@@ -50,6 +52,19 @@ impl<'a> TryFrom<Option<&'a Table>> for Config {
             cfg.marker = marker.into();
         }
 
+        if let Some(level) = mdbook_cfg.get("max-level") {
+            let level = match level.as_integer() {
+                Some(l) => l,
+                None => {
+                    return Err(Error::msg(format!(
+                        "Level {:?} is not a valid integer",
+                        level
+                    )))
+                }
+            };
+            cfg.max_level = level.try_into()?;
+        }
+
         Ok(cfg)
     }
 }

From 9a9288085fc1cbff1724db682e4b9da10c92cb35 Mon Sep 17 00:00:00 2001
From: Jan-Erik Rediger <janerik@fnordig.de>
Date: Wed, 6 Jan 2021 14:40:06 +0100
Subject: [PATCH 4/6] Pass config everywhere

---
 src/lib.rs | 137 ++++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 120 insertions(+), 17 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index eee96bd..9fef8c8 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,6 +1,6 @@
 use std::cmp::Ordering;
 use std::collections::HashMap;
-use std::convert::TryFrom;
+use std::convert::{TryFrom, TryInto};
 use std::fmt::Write;
 
 use mdbook::book::{Book, BookItem, Chapter};
@@ -84,7 +84,7 @@ impl Preprocessor for Toc {
             }
 
             if let BookItem::Chapter(ref mut chapter) = *item {
-                res = Some(Toc::add_toc(chapter, &cfg.marker).map(|md| {
+                res = Some(Toc::add_toc(chapter, &cfg).map(|md| {
                     chapter.content = md;
                 }));
             }
@@ -130,7 +130,7 @@ fn build_toc(toc: &[(u32, String, String)]) -> String {
     result
 }
 
-fn add_toc(content: &str, marker: &str) -> Result<String> {
+fn add_toc(content: &str, cfg: &Config) -> Result<String> {
     let mut buf = String::with_capacity(content.len());
     let mut toc_found = false;
 
@@ -145,7 +145,7 @@ fn add_toc(content: &str, marker: &str) -> Result<String> {
     opts.insert(Options::ENABLE_STRIKETHROUGH);
     opts.insert(Options::ENABLE_TASKLISTS);
 
-    let mark: Vec<Event> = Parser::new(marker).collect();
+    let mark: Vec<Event> = Parser::new(&cfg.marker).collect();
     let mut mark_start = -1;
     let mut mark_loc = 0;
     let mut c = -1;
@@ -189,7 +189,7 @@ fn add_toc(content: &str, marker: &str) -> Result<String> {
 
                 *id_count += 1;
 
-                if level < 5 {
+                if level <= cfg.max_level {
                     toc_content.push((level, header, slug));
                 }
 
@@ -241,16 +241,32 @@ fn add_toc(content: &str, marker: &str) -> Result<String> {
 }
 
 impl Toc {
-    fn add_toc(chapter: &mut Chapter, marker: &str) -> Result<String> {
-        add_toc(&chapter.content, marker)
+    fn add_toc(chapter: &mut Chapter, cfg: &Config) -> Result<String> {
+        add_toc(&chapter.content, cfg)
     }
 }
 
 #[cfg(test)]
 mod test {
-    use super::{add_toc, DEFAULT_MARKER};
+    use super::{add_toc, Config};
     use pretty_assertions::assert_eq;
 
+    fn default<T: Default>() -> T {
+        Default::default()
+    }
+
+    fn with_marker<S: Into<String>>(marker: S) -> Config {
+        let mut cfg = Config::default();
+        cfg.marker = marker.into();
+        cfg
+    }
+
+    fn with_max_level(level: u32) -> Config {
+        let mut cfg = Config::default();
+        cfg.max_level = level;
+        cfg
+    }
+
     #[test]
     fn adds_toc() {
         let content = r#"# Chapter
@@ -292,7 +308,7 @@ mod test {
 
 ### Header 2.2.1"#;
 
-        assert_eq!(expected, add_toc(content, DEFAULT_MARKER).unwrap());
+        assert_eq!(expected, add_toc(content, &default()).unwrap());
     }
 
     #[test]
@@ -325,7 +341,7 @@ mod test {
 
 ## Header 2.1"#;
 
-        assert_eq!(expected, add_toc(content, DEFAULT_MARKER).unwrap());
+        assert_eq!(expected, add_toc(content, &default()).unwrap());
     }
 
     #[test]
@@ -347,7 +363,7 @@ mod test {
 |------|------|
 |Row 1|Row 2|"#;
 
-        assert_eq!(expected, add_toc(content, DEFAULT_MARKER).unwrap());
+        assert_eq!(expected, add_toc(content, &default()).unwrap());
     }
 
     #[test]
@@ -396,7 +412,7 @@ mod test {
 
 # Another header `with inline` code"#;
 
-        assert_eq!(expected, add_toc(content, DEFAULT_MARKER).unwrap());
+        assert_eq!(expected, add_toc(content, &default()).unwrap());
     }
 
     #[test]
@@ -443,7 +459,7 @@ mod test {
 
 ## User Preferences"#;
 
-        assert_eq!(expected, add_toc(content, DEFAULT_MARKER).unwrap());
+        assert_eq!(expected, add_toc(content, &default()).unwrap());
     }
 
     #[test]
@@ -480,7 +496,7 @@ text"#;
 
 text"#;
 
-        assert_eq!(expected, add_toc(content, DEFAULT_MARKER).unwrap());
+        assert_eq!(expected, add_toc(content, &default()).unwrap());
     }
 
     #[test]
@@ -525,7 +541,7 @@ text"#;
 
 ### Header 2.2.1"#;
 
-        assert_eq!(expected, add_toc(content, &marker).unwrap());
+        assert_eq!(expected, add_toc(content, &with_marker(marker)).unwrap());
     }
 
     #[test]
@@ -561,7 +577,7 @@ text"#;
 
 ## Duplicate"#;
 
-        assert_eq!(expected, add_toc(content, DEFAULT_MARKER).unwrap());
+        assert_eq!(expected, add_toc(content, &default()).unwrap());
     }
 
     #[test]
@@ -607,6 +623,93 @@ text"#;
 
 ### Header 2.2.1"#;
 
-        assert_eq!(expected, add_toc(content, &marker).unwrap());
+        assert_eq!(expected, add_toc(content, &with_marker(marker)).unwrap());
+    }
+
+    #[test]
+    fn lower_max_level() {
+        let content = r#"# Chapter
+
+<!-- toc -->
+
+# Header 1
+
+## Header 1.1
+
+# Header 2
+
+## Header 2.1
+
+## Header 2.2
+
+### Header 2.2.1
+
+"#;
+
+        let expected = r#"# Chapter
+
+* [Header 1](#header-1)
+  * [Header 1.1](#header-11)
+* [Header 2](#header-2)
+  * [Header 2.1](#header-21)
+  * [Header 2.2](#header-22)
+
+# Header 1
+
+## Header 1.1
+
+# Header 2
+
+## Header 2.1
+
+## Header 2.2
+
+### Header 2.2.1"#;
+
+        assert_eq!(expected, add_toc(content, &with_max_level(2)).unwrap());
+    }
+
+    #[test]
+    fn higher_max_level() {
+        let content = r#"# Chapter
+
+<!-- toc -->
+
+# Header 1
+
+## Header 1.1
+
+# Header 2
+
+## Header 2.1
+
+## Header 2.2
+
+### Header 2.2.1
+
+"#;
+
+        let expected = r#"# Chapter
+
+* [Header 1](#header-1)
+  * [Header 1.1](#header-11)
+* [Header 2](#header-2)
+  * [Header 2.1](#header-21)
+  * [Header 2.2](#header-22)
+    * [Header 2.2.1](#header-221)
+
+# Header 1
+
+## Header 1.1
+
+# Header 2
+
+## Header 2.1
+
+## Header 2.2
+
+### Header 2.2.1"#;
+
+        assert_eq!(expected, add_toc(content, &with_max_level(7)).unwrap());
     }
 }

From eeec295a788acda312db2fcafc7fcb3a98d04a79 Mon Sep 17 00:00:00 2001
From: Jan-Erik Rediger <janerik@fnordig.de>
Date: Wed, 6 Jan 2021 14:40:06 +0100
Subject: [PATCH 5/6] Document configurability of the maximum level.

Fixes #11
---
 README.md | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index be735c9..3e56ad4 100644
--- a/README.md
+++ b/README.md
@@ -34,7 +34,9 @@ Finally, build your book as normal:
 mdbook path/to/book
 ```
 
-## Custom TOC marker
+## Configuration
+
+### Custom TOC marker
 
 The default marker is:
 
@@ -42,7 +44,7 @@ The default marker is:
 <!-- toc -->
 ```
 
-If you wish to use a different, such as the GitLab marker `[[_TOC_]]`, you must add the following settings to your `book.toml`.
+If you wish to use a different marker, such as the GitLab marker `[[_TOC_]]`, you must add the following settings to your `book.toml`.
 
 ```toml
 [preprocessor.toc]
@@ -71,6 +73,16 @@ marker = """* auto-gen TOC;
 {:toc}"""
 ```
 
+### Maximum header level
+
+By default the ToC will include headings up to level 4 (`####`).
+This can be configured in your `book.toml` as follows:
+
+```toml
+[preprocessor.toc]
+max-level = 4
+```
+
 ## License
 
 MPL. See [LICENSE](LICENSE).  

From 896a9b2c3d29cb7f8fac23320bb8611340c3d134 Mon Sep 17 00:00:00 2001
From: Jan-Erik Rediger <janerik@fnordig.de>
Date: Wed, 6 Jan 2021 14:59:32 +0100
Subject: [PATCH 6/6] Don't generate docs for dependencies when just testing

---
 .github/workflows/tests.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index d512b94..563aab0 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -50,4 +50,4 @@ jobs:
       run: cargo fmt --all -- --check
 
     - name: Docs
-      run: cargo doc
+      run: cargo doc --no-deps