#The entinyGram SDK

entinyGram builds on Inugram's plugin engine and adds a layer for plugin authors: a way to put a plugin's settings directly into the app's own screens, a Marketplace to find and install plugins, and a dependency system between plugins.

The SDK is made of three parts:

• The SDK plugin, entinygram.sdk. An ordinary plugin that carries the Marketplace and the settings placement engine. It is the one that actually draws other plugins' rows into the app's screens.
• The @entiny/sdk package. What a plugin imports to ask for placement: withEntiny, the embed function and the typed list of places a setting can go.
• A small bridge in the app, used by the Marketplace to list and install plugins. Plugin authors rarely touch it.

The SDK adds no features of its own. A plugin that wants to change how the app behaves does it with the engine's own tools: unsafe.jvm and unsafe.xposed, ideally as routines. The SDK only gives such a plugin a proper place for its settings.

#Why it exists

A plugin normally has one settings page, reached through the Settings button in the plugin list. That is fine for a plugin that is a tool of its own. It is awkward for a plugin that changes how a part of the app works: the user expects a map plugin's switch beside the other map settings, not in a separate page they have to find.

With the SDK, a plugin can:

• add a row that opens its page from a place that makes sense (screen),
• draw its switches and sliders into a section of the app's settings, or next to a specific setting (inline),
• add its own options to one of the app's pickers, such as the map preview provider (choice).

#Requirements and installation

A plugin that uses the SDK needs the SDK plugin installed. The plugin says so in its header with a @requires line, and the app enforces it:

• Installing. If entinygram.sdk is missing, disabled or too old, installation is refused with a message such as "Needs the plugin entinygram.sdk. Install it first".
• Running. If a user disables the SDK, every plugin that depends on it is suspended at once. When the SDK is switched back on, they are restored.

You do not write the @requires line yourself. withEntiny adds it.

#Using withEntiny

Wrap the manifest in withEntiny in your inu.config.ts. The second argument says where the plugin's settings should appear:

import { defineConfig } from '@inugram/cli'
import { withEntiny } from '@entiny/sdk'

export default defineConfig({
  plugins: {
    'my-plugin': {
      entry: 'src/index.ts',
      manifest: withEntiny({
        id: 'com.example.my-plugin',
        name: 'My Plugin',
        author: '@you',
        version: '1.0.0',
        description: 'Demonstrates settings placement',
        grants: ['unsafe.jvm', 'unsafe.xposed'],
      }, {
        // 1. a row that opens the plugin's whole page as a screen:
        screen: ['root.root-system'],
        // 2. controls drawn into a section or next to an item:
        inline: [
          'behavior.formatting',
          { slot: 'translate-provider.end', rows: ['key'], when: 'translation-provider' },
        ],
        // 3. options added to a picker list:
        choice: [{ slot: 'behavior.map-preview-provider', rows: ['maps'] }],
      }),
    },
  },
})

withEntiny writes @entiny-menu, @entiny-inline and @entiny-choice directives into the header, plus @requires entinygram.sdk >=0.1.0-alpha. The app reads the directives only from plugins that require the SDK.

#The three kinds of placement

They can be combined and repeated.

rows lists the ids of the page rows to show, so one page can serve several places. For inline, when: 'translation-provider' shows the rows only while one of the plugin's translation providers is the chosen one.

#Slots

A slot names a place: <screen>.<name>.

• The screen is the class name of the settings screen in kebab case, without Settings or Activity: behavior, category-chats, root.
• The name is a string resource of the app without the Inu prefix: formatting.

Add a suffix to say where in the place the row goes:

Every screen, section, item and picker is listed in slots.json and typed as EntinySlot and ChoiceSlot in @entiny/sdk, so your editor completes them. That list is a snapshot: the SDK finds screens and slots itself while the app runs, by reading the strings of the running app. A slot that is not in the list still works if the section or row exists.

#Placing rows from code: embed

The directives in the manifest are read by the app. The SDK plugin embeds rows by itself, with no code in the app: it hooks the base class of every settings screen and adds the rows that other plugins ask for. A plugin asks through embed:

import { embed } from '@entiny/sdk/embed'

let on = false

embed({
  id: 'com.example.my-plugin',
  name: 'My plugin',
  placements: {
    screen: ['root.root-system'],
    inline: [{ slot: 'behavior.formatting', rows: ['switch'] }],
  },
  rows: slot => [{ id: 'switch', type: 'check', text: 'Do the thing', checked: on }],
  onEvent: (row, value) => { if (row === 'switch') on = value === 'true' },
  open: () => inu.ui.openPage(page),
})

The pieces:

A row is a check, a button or a select. Each can carry subtitle, value and danger; a select also takes options and selected.

Call embedChanged() after you change state that a row shows, so the screen redraws.

#Picker options

To add an option to one of the app's pickers, for example the Map preview provider list opened from a settings row, put the picker's slot in placements.choice and answer choices(slot):

embed({
  id: 'com.example.my-maps',
  name: 'My maps',
  placements: { choice: ['behavior.map-preview-provider'] },
  rows: () => [],
  onEvent: () => {},
  choices: () => [{ id: 'maps', title: 'My maps', subtitle: 'Previews from my service', checked: on }],
  onChoice: (id, picked) => { on = picked; embedChanged() },
})

The option shows as My maps (My plugin). Picking it calls onChoice(id, true) and tells every other plugin option of the same picker false. Picking one of the app's own options tells all of them false. The row that opens the picker shows the chosen plugin option as its value. A plugin can add up to two options per picker.

#Limits and honesty

To prevent a plugin from spoofing the interface:

• at most 4 rows per plugin per slot and 2 options per plugin per picker;
• every inline control and option shows clearly which plugin it comes from;
• callbacks go only to the plugin that registered them.

Everything runs in the SDK plugin, which needs unsafe.jvm and unsafe.xposed. Without the SDK, or on a device where the hook layer does not start, nothing is embedded and your plugin keeps working on its own page.

#On plain Inugram

Inugram ignores header directives it does not know, and inu.registerSettings still works there. A plugin that uses withEntiny still installs on plain Inugram, and its page opens from the plugin list. Only the placement is entinyGram only. If your plugin depends on the SDK being there, say so in the description.

#Calling the bridge

The Marketplace talks to the app through a small bridge class, EntinyMarketBridge, which exists only in entinyGram. In plain Inugram its class is missing, so the SDK runs in standalone mode: it still browses catalogs and embeds settings, but cannot list or install plugins itself and instead hands you a download link. A plugin that wants to use the bridge should do it defensively:

let bridge: ReturnType<typeof inu.jvm.cls> | null = null
try {
  bridge = inu.jvm.cls('desu.inugram.helpers.entiny.EntinyMarketBridge')
} catch {
  bridge = null
}

#A complete small example

A plugin that adds a switch to the app's formatting section and a page of its own:

// src/index.ts
import { embed, embedChanged } from '@entiny/sdk/embed'

let enabled = localStorage.getItem('enabled') === '1'

const page = inu.ui.settingsPage({
  title: 'My plugin',
  items: () => [
    inu.ui.check({
      id: 'switch',
      text: 'Do the thing',
      checked: enabled,
      onChange: (value) => set(value),
    }),
  ],
})
inu.registerSettings(page)

function set(value: boolean) {
  enabled = value
  localStorage.setItem('enabled', value ? '1' : '0')
  embedChanged()
}

embed({
  id: 'com.example.my-plugin',
  name: 'My plugin',
  placements: { inline: [{ slot: 'behavior.formatting', rows: ['switch'] }] },
  rows: () => [{ id: 'switch', type: 'check', text: 'Do the thing', checked: enabled }],
  onEvent: (row, value) => { if (row === 'switch') set(value === 'true') },
})

The same state backs the inline row and the plugin's own page, and embedChanged() keeps them in step.

#Source and further reading

• sdk/entiny/src/index.ts: withEntiny, the @requires rule and the placement types
• sdk/entiny/src/embed.ts: embed and its row types
• sdk/entiny/src/slots.ts and slots.json: every place a setting can go
• plugins/entiny-sdk/src/embed/engine.ts: the engine that draws the rows into the app
• plugins/text-animation: screen and inline placement in a real plugin
• EntinyMarketBridge.kt: the bridge on the app side
• Source map: everything in one table