reascriptluaparser

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reascriptluaparser

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Parser for reascript API HTML file from Reaper DAW. Use as module or global CLI

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# reascriptluaparser

## About

This tool parses the reascripthelp.html file generated by [Reaper](https://www.reaper.fm/) and generates a JSON containing an array of methods from the api. It can be used as as CLI that will write a reaperAPI.json file to the same directory of the given html file, or as a module that receives a string with the html and returns an array of methods.

If you need help generating reascripthelp.html from reaper, see [Generating Reaper API HTML](#generating-reaper-api-html)

The resulting api has been eye checked but not extensively manually checked yet. if you find any bugs or unexpected output, please open an issue.

### Example parsed result

```jsonc
[
  // Lua: MediaItem reaper.AddMediaItemToTrack(MediaTrack tr)
  {
    "name": "AddMediaItemToTrack",
    "params": [{ "type": "MediaTrack", "name": "tr" }],
    "returns": [{ "type": "MediaItem" }],
    "namespace": "reaper",
    "description": "creates a new media item."
  },
  // Lua: integer reaper.AddProjectMarker(ReaProject proj, boolean isrgn, number pos, number rgnend, string name, integer wantidx)
  {
    "name": "AddProjectMarker",
    "params": [
      { "type": "ReaProject", "name": "proj" },
      { "type": "boolean", "name": "isrgn" },
      { "type": "number", "name": "pos" },
      { "type": "number", "name": "rgnend" },
      { "type": "string", "name": "name" },
      { "type": "integer", "name": "wantidx" }
    ],
    "returns": [{ "type": "integer" }],
    "namespace": "reaper",
    "description": "Returns the index of the created marker/region, or -1 on failure. Supply wantidx>=0 if you want a particular index number, but you'll get a different index number a region and wantidx is already in use."
  },
  // Lua: integer reaper.DeleteTakeStretchMarkers(MediaItem_Take take, integer idx, optional number countIn)
  {
    "name": "DeleteTakeStretchMarkers",
    "params": [
      { "type": "MediaItem_Take", "name": "take" },
      { "type": "integer", "name": "idx" },
      { "type": "number", "name": "countIn", "optional": true }
    ],
    "namespace": "reaper",
    "description": "Deletes one or more stretch markers. Returns number of stretch markers deleted."
  }
]
```

## Install

Use as a CLI:

```
npm install --global reascriptluaparser
```

Use as a module in your project:

```
npm install reascriptluaparser
```

## CLI Usage

This tool does one thing, and one thing only: It parses a given html file and saves the parsed array to a JSON file in the same directory of the source file.

```
reascriptluaparser /path/to/reascripthelp.html
```

### options:

```
Options:
  -V, --version  output the version number
  -h, --help     display help for command
```

## Module Usage

This package is written in Typescript and bundles it's own [types declarations](#types). It can therefore be used out of the box in JS or TS projects.

It exports a single **Synchronous** method that takes a string containing the HTML from the file and returns an [array of methods](#example-parsed-result)

In case of malformed HTML or invalid input the parser will throw.

### Minimal Example

Javascript + Node

```javascript
const fs = require('fs')
const { parser } = require('reascriptluaparser')

const html = fs.readFileSync('./reascripthelp.html', 'utf8')
const api = parser(html)
```

Typescript (depends on your tsconfig.json)

```typescript
import fs = require('fs')
import { parser } from 'reascriptluaparser'

const html = fs.readFileSync('./reascripthelp.html', 'utf8')
const api = parser(html)
```

## Types

typescript types:

```typescript
interface Method {
  name: string
  params?: Variable[]
  returns?: Variable[]
  description?: string
  namespace?: string
}

interface Variable {
  type?: string
  name?: string
  optional?: boolean
}
```

reascriptluaparser returns type Method[]

## Generating Reaper API HTML

1. Open [Reaper](https://www.reaper.fm/)
2. Select **Help** -> **ReaScript Documentation** from the top menu. this will open a page in your browser
3. The address for the page points to the generated file. You might want to copy it somewhere else.

## Known Issues

- parser ignores entries _Lua: reaper.new_array([table|array][size])_, _gfx.triangle(x1,y1,x2,y2,x3,y3[x4,y4...])_, and _gfx.printf("format"[, ...])_

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