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🦀 Markdown Table of Content generator

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# `mktoc`

![](https://raw.githubusercontent.com/KevinGimbel/mktoc/main/assets/github-header.png)

<small>Graphic design is my passion ✨</small>

![](https://github.com/kevingimbel/mktoc/workflows/Clippy%20check/badge.svg)
![](https://github.com/kevingimbel/mktoc/workflows/Test/badge.svg)
![Coverage](https://raw.githubusercontent.com/KevinGimbel/mktoc/main/assets/coverage/flat.svg)

# Table of Contents

- [About](#about)
- [Installation](#installation)
  - [Cargo](#cargo)
  - [Binary](#binary)
  - [Hermit](#hermit)
  - [Nix](#nix)
    - [Run on demand ](#run-on-demand)
    - [Install (nixos / nix-darwin)](#install-nixos--nix-darwin)
- [Usage](#usage)
  - [Update Markdown file](#update-markdown-file)
    - [Inline config](#inline-config)
      - [`min_depth`](#min_depth)
      - [`max_depth`](#max_depth)
      - [`wrap_in_details`](#wrap_in_details)
  - [Command line](#command-line)
  - [Environment configuration](#environment-configuration)
- [Auto-run with VSCode](#auto-run-with-vscode)
- [Performance](#performance)
- [Contributing](#contributing)
  - [Where to start?](#where-to-start)
  - [Tooling](#tooling)
    - [Nix](#nix)
  - [Install dev build](#install-dev-build)
- [License](#license)

## About
[⬆️ Back to Top](#table-of-contents)

`mktoc` parses markdown files and generates a Table Of Content linking all headlines up to heading level 6 deep, or as specified by command line arguments, environment variables, or inline JSON config (see [Usage](#usage)).

## Installation
[⬆️ Back to Top](#table-of-contents)

`mktoc` can be installed using Cargo, the Rust package manager.

### Cargo

**Installation**
```sh
$ cargo install mktoc
```

**Update**
```sh
$ cargo install --force mktoc
```

### Binary

Binaries for Linux and MacOS can be downloaded from the [release page](https://github.com/KevinGimbel/mktoc/releases/latest).

Windows Binaries are not yet build automatically, see [#7](https://github.com/KevinGimbel/mktoc/issues/7).

### Hermit

`mktoc` is available in [hermit](https://github.com/cashapp/hermit) so it can be installed on a per-project basis without the need to install it globally.

```sh
$ hermit init
$ hermit install mktoc
```

This installs `mktoc` to the local bin directory at `bin/mktoc` inside the project.

### Nix

`mktoc` is available in [nixpkgs](https://search.nixos.org/packages?channel=unstable&show=mktoc&query=mktoc) since version 25.11.

#### Run on demand

```sh
nix run 'github:nixos/nixpkgs/nixpkgs-unstable#mktoc'
```

#### Install (nixos / nix-darwin)

```nix
environment.systemPackages = [
  pkgs.mktoc
];
```

## Usage

### Update Markdown file
[⬆️ Back to Top](#table-of-contents)

Add the following HTML comment into the Markdown file where the Table of Contents should be rendered.

```html


```

Everything between those comments will be replaced!

#### Inline config
[⬆️ Back to Top](#table-of-contents)

Starting with version 3.0.0 it's possible to set values in-line which is great when collaborating with teams who may have individual settings.

```html

<!-- END mktoc -- >
```

this is equal to running `mktoc -m 2 -M 4` or setting these environment variables `MKTOC_MIN_DEPTH=2` and `MKTOC_MAX_DEPTH=4`.

Inline config takes priority over environment or CLI arguments.

##### `min_depth`

The minimum depth to look for, defaults to 1 which is equal to `<h1>` or `#`.

##### `max_depth`

The maximum depth to look for, defaults to 6 which is equal to `<h6>` or `######`.

##### `wrap_in_details`

If set to true, the ToC will be wrapped in a `<details>` element.

### Command line
[⬆️ Back to Top](#table-of-contents)

Specify `--stdout` or `-s` to output generated content to `stdout` instead of overwriting file. By default the specified file will be overwritten.

```sh
$ mktoc -h
Generate Table of Contents from Markdown files

Usage: mktoc [OPTIONS] [FILE]

Arguments:
  [FILE]  [default: README.md]

Options:
  -s, --stdout                 If set will output to stdout instead of replacing content in file
  -m, --min-depth <MIN_DEPTH>  Minimum heading level [env: MKTOC_MIN_DEPTH=] [default: 1]
  -M, --max-depth <MAX_DEPTH>  Maximum heading level [env: MKTOC_MAX_DEPTH=] [default: 6]
  -w, --wrap-in-details        Wrap ToC in details html element [env: MKTOC_WRAP_IN_DETAILS=]
  -h, --help                   Print help
  -V, --version                Print version

$ mktoc -s README.md
$ mktoc -m 2 -M 4 README.md
$ mktoc
```

If no arguments are given the default or configured (via environment) values are
used.

See `mktoc --help` for list of all arguments and flags.

```sh
mktoc

USAGE:
mktoc [FLAGS] [OPTIONS] [file]

FLAGS:
-h, --help       Prints help information
-s, --stdout     If set will output to stdout instead of replacing content in file
-V, --version    Prints version information

OPTIONS:
-M, --max-depth <max-depth>    Maximum heading level [env: MKTOC_MAX_DEPTH=]  [default: 6]
-m, --min-depth <min-depth>    Minimum heading level [env: MKTOC_MIN_DEPTH=2]  [default: 1]

ARGS:
<file>     [default: README.md]
```

### Environment configuration
[⬆️ Back to Top](#table-of-contents)

mktoc can be configured with environment variables, namely:

- `MKTOC_MIN_DEPTH` equal to `-m`
- `MKTOC_MAX_DEPTH` equal to `-M`

Place these variables in a shell environment file such as `~/.bashrc` or
`~/.zshrc`, then just run mktoc without `-m` and `-M`

```sh
# The following in ~/.bashrc|~/.zshrc configures mktoc to render headings from level 2 to
# level 4
# 
# MKTOC_MIN_DEPTH=2
# MKTOC_MAX_DEPTH=4
# MKTOC_WRAP_IN_DETAILS=true

$ mktoc README.md
```

## Auto-run with VSCode
[⬆️ Back to Top](#table-of-contents)

For VSCode the [Run on save](https://github.com/emeraldwalk/vscode-runonsave) extension can be used to trigger mktoc.

Install the extension and then add the following config to workspace or user `settings.json`.

```json
"emeraldwalk.runonsave": {
  "commands": [
    {
      "match": "\\.md$",
      "cmd": "mktoc ${file}"
    }
  ]
}
```

This will run the command for every markdown file on safe. If there is no mktoc comment in the Markdown file nothing happens.

## Performance
[⬆️ Back to Top](#table-of-contents)

`mktoc` is fast but can probably be even faster! Pull Requests and bug reports are appreciated!

## Contributing
[⬆️ Back to Top](#table-of-contents)

We love and welcome every form of contribution.

### Where to start?

Here are some good places to start:

* Issues with label [Good first issue](https://github.com/kevingimbel/mktoc/labels/good%20first%20issue)
* Issues with label [Documentation](https://github.com/kevingimbel/mktoc/labels/documentation)
* Providing example implementations or usage demos

### Tooling

#### Nix

The easiest way to get up and running is using Nix (tho Nix is not easy at all 😅). Nix has a lot of documentation, the [Installation Guide](https://nix.dev/install-nix) is a good starting point. After Nix is installed on your system, the development environment can be started with `nix develop` or `just dev` (if just is installed globally).

If you're new to nix or having trouble, feel free to reach out to me. I'd be more than happy to help!

The nix environment includes all tools we need:

- [prek](https://prek.j178.dev/) to run manage and run git hooks
- [just](https://github.com/casey/just) to run tasks
- [mktoc](https://github.com/KevinGimbel/mktoc) for table of content generation in the README.md (neat!)

Additionally, we need the following which is managed by cargo: 
- [criterion](https://github.com/bheisler/criterion.rs) for benchmarking

### Install dev build

Sometimes it's nice to install a specific version of mktoc, this can be done with the following command:

```sh
# install specific commit
cargo install --git https://github.com/KevinGimbel/mktoc --force --rev $COMMIT_ID
# install branch
cargo install --git https://github.com/KevinGimbel/mktoc --force --branch $BRANCH_NAME
```

## License
[⬆️ Back to Top](#table-of-contents)

MIT, see LICENSE file.

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