Add information about how to add new languages to monaco (#24906)

* Add information about how to add new languages to monaco

* Update expect.txt

* Update doc/devdocs/modules/FileExplorer/monaco/readme.md

Co-authored-by: Jay <65828559+Jay-o-Way@users.noreply.github.com>

* Adress PR feedback

* fix spelling errors

* Update doc/devdocs/modules/FileExplorer/monaco/readme.md

Co-authored-by: Heiko <61519853+htcfreek@users.noreply.github.com>

* Update readme.md

* Update readme.md

* Address PR comments

* Fix spelling

* address PR comments

* address PR comments and move files

* Update expect.txt

* Update doc/devdocs/common/readme.md

Co-authored-by: Heiko <61519853+htcfreek@users.noreply.github.com>

* Update doc/devdocs/common/FilePreviewCommon.md

Co-authored-by: Heiko <61519853+htcfreek@users.noreply.github.com>

* Update doc/devdocs/common/FilePreviewCommon.md

Co-authored-by: Heiko <61519853+htcfreek@users.noreply.github.com>

* Update doc/devdocs/common/FilePreviewCommon.md

Co-authored-by: Heiko <61519853+htcfreek@users.noreply.github.com>

* Update doc/devdocs/common/FilePreviewCommon.md

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* Update doc/devdocs/common/FilePreviewCommon.md

Co-authored-by: Stefan Markovic <57057282+stefansjfw@users.noreply.github.com>

* Apply suggestions from code review

Co-authored-by: Stefan Markovic <57057282+stefansjfw@users.noreply.github.com>

* Adress PR comments

* Fix spelling

* Adress PR comments

* Add peek stub documentation

* Update doc/devdocs/common/FilePreviewCommon.md

Co-authored-by: Stefan Markovic <57057282+stefansjfw@users.noreply.github.com>

* Update doc/devdocs/common/FilePreviewCommon.md

* Fix spelling

---------

Co-authored-by: Jay <65828559+Jay-o-Way@users.noreply.github.com>
Co-authored-by: Heiko <61519853+htcfreek@users.noreply.github.com>
Co-authored-by: Stefan Markovic <57057282+stefansjfw@users.noreply.github.com>
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Knownfolders
KSPROPERTY
Kybd
LAlt
Lambson
languagesjson
langword
lastcodeanalysissucceeded
Lastdevice
LAYOUTRTL
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NOTSRCERASE
NOZORDER
NPH
npmjs
NResize
nrw
nsunt
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WDA
wdp
wdupenv
weakme
webbrowsers
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# [FilePreviewCommon](/src/common/FilePreviewCommon)
This project contains common code used for previewing and displaying files.
## Monaco preview
Monaco preview enables to display developer files. It is based on [Microsoft's Monaco Editor](https://microsoft.github.io/monaco-editor/) which is maintained by the Visual Studio Code team.
This previewer is used for the File Explorer Dev File Previewer, as well as PowerToys Peek.
### Update Monaco Editor
1. Download Monaco editor with [npm](https://www.npmjs.com/): Run `npm i monaco-editor` in the command prompt.
2. Delete everything except the `min` folder (the minimised code) from the downloaded files.
3. Copy the `min` folder into the `src/common/FilePreviewCommon/Assets/Monaco/monacoSRC` folder of the PowerToys project.
4. Generate the JSON file as described in the generate [monaco_languages.json file](#monaco_languagesjson) section.
### Add a new language definition
As an example on how to add a new language definition you can look at the one for [registry files](/src/common/FilePreviewCommon/Assets/Monaco/customLanguages/reg.js).
1. Add the new language definition (written with [Monarch](https://microsoft.github.io/monaco-editor/monarch.html)) as a new file to the [folder containing Monaco custom languages](/src/common/FilePreviewCommon/Assets/Monaco/customLanguages/) (Remember the file name and the string you used for "idDefinition" as you need it later.). The file should be formatted like in the example below. (Please change `idDefinition` to the name of your language.)
```javascript
export function idDefinition() {
return {
...
}
}
```
2. Add the following line to the [`monacoSpecialLanguages.js`](/src/common/FilePreviewCommon/Assets/Monaco/monacoSpecialLanguages.js) file, after the other import statements:
```javascript
import { idDefinition } from './customLanguages/file.js';
```
> Replace file.js with the name of your definition file from step 1. Please replace idDefinition with the string you used in step 1.
3. In the [`monacoSpecialLanguages.js`](/src/common/FilePreviewCommon/Assets/Monaco/monacoSpecialLanguages.js) file add the following line into the `registerAdditionalLanguages` function:
```javascript
registerAdditionalNewLanguage("id", [".fileExtension"], idDefinition(), monaco)
```
> Replace id and idDefinition with your id and string used in step 1. Replace fileExtension with a set of file extensions you want the language to register to.
* The id can be anything. Recommended is one of the file extensions. For example "php" or "reg".
4. Execute the steps described in the [monaco_languages.json](#monaco_languagesjson) section.
### Add a new file extension to an existing language
1. In the [`monacoSpecialLanguages.js`](/src/common/FilePreviewCommon/Assets/Monaco/monacoSpecialLanguages.js) file add the following line to the `registerAdditionalLanguages` function. (`existingId` is the id of the language you want to add the extension to. You can find these id's in the [`monaco_languages.json`](/src/common/FilePreviewCommon/Assets/Monaco/monaco_languages.json) file):
```javascript
registerAdditionalLanguage("id", [".fileExtension"], "existingId", monaco)
```
* If for instance you want to add more extensions to the php language set the id to `phpExt` and the existingId to `php`.
2. Copy the existing language definition into the `languageDefinitions` function in the same file. You can find the existing definitions in the following folder: [`/src/common/FilePreviewCommon/Assets/Monaco/monacoSRC/min/vs/basic-languages/`](/src/common/FilePreviewCommon/Assets/Monaco/monacoSRC/min/vs/basic-languages/).
3. Execute the steps described in the [monaco_languages.json](#monaco_languagesjson) section.
### monaco_languages.json
[`monaco_languages.json`](/src/common/FilePreviewCommon/Assets/Monaco/monaco_languages.json) contains all extensions and IDs for the languages supported by Monaco. The [`MonacoHelper`](/src/common/FilePreviewCommon/MonacoHelper.cs) class and the installer are using this file to register preview handlers for the defined extensions.
After updating Monaco Editor and/or adding a new language you should update the [`monaco_languages.json`](/src/common/FilePreviewCommon/Assets/Monaco/monaco_languages.json) file.
1. Run the [`generateLanguagesJson.html`](/src/common/FilePreviewCommon/Assets/Monaco/generateLanguagesJson.html) file on a local webserver (as webbrowsers will block certain needed features when running the file locally.)
* This can for example be achieved by using the [Preview Server](https://marketplace.visualstudio.com/items?itemName=yuichinukiyama.vscode-preview-server) extension for Visual Studio Code: Open the file in Visual Studio Code, right click in the code editor and select `vscode-preview-server: Launch on browser`. The file will be opened in a browser.
2. The browser will download the new `monaco_languages.json` file
3. Replace the old file with the newly downloaded one in the source code folder.

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# Classes and structures
> This document is outdated and will soon be renewed.
#### class Animation: [header](/src/common/animation.h) [source](/src/common/animation.cpp)
Animation helper class with two easing-in animations: linear and exponential.

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# Common
The [common](/src/common) folder contains projects with code, that is used in multiple projects.
## [FilePreviewCommon](FilePreviewCommon.md)
This project contains common code for file previewing.

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# PowerToys Peek
> Documentation is currently under construction
## Dev file previewer
The previewer for developer files uses the project in [FileExplorerCommon] common project to render monaco. You can find its documentation here: [/doc/devdocs/common/FilePreviewCommon.md](/doc/devdocs/common/FilePreviewCommon.md).

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# Developer Preview (Monaco)
Developer preview is based on [Microsoft's Monaco Editor](https://microsoft.github.io/monaco-editor/) which is maintained by the Visual Studio Code team.
## Update monaco editor
1. Download Monaco editor with npm: `npm i monaco-editor`.
2. Delete everything except the `min` folder (the minimised code).
3. Copy the `min` folder inside the [`monacoSRC`](/src/modules/previewpane/MonacoPreviewHandler/monacoSRC) folder.
4. Generate the JSON file (see section below)
## monaco_languages.json
[`monaco_languages.json`](/src/modules/previewpane/MonacoPreviewHandler/monaco_languages.json) contains all extensions and Id's for the supported languages of Monaco. The [`FileHandler`](/src/modules/previewpane/MonacoPreviewHandler/FileHandler.cs) class and the installer are using this file.
### Generate monaco_languages.json file
After you updated monaco editor or adding a new language you should update the [`monaco_languages.json`](/src/modules/previewpane/MonacoPreviewHandler/monaco_languages.json) file.
You have to run the file on a local webserver!
1. Build monaco in debug mode.
2. Open [generateLanguagesJson.html](/src/modules/previewpane/MonacoPreviewHandler/generateLanguagesJson.html) in a browser.
3. Replace the old JSON file.