feat(dice): roll command

packages/plugin-dice/package.json

@@ -0,0 +1,44 @@
+{
+  "name": "koishi-plugin-dice",
+  "version": "0.1.0",
+  "description": "COC / DND Tools for Koishi",
+  "main": "dist/index.js",
+  "typings": "dist/index.d.ts",
+  "engines": {
+    "node": ">=14.6.0"
+  },
+  "files": [
+    "dist"
+  ],
+  "scripts": {
+    "wrap": "ts-node build/wrap",
+    "prepack": "tsc -b && yarn wrap"
+  },
+  "license": "MIT",
+  "author": "Shigma <1700011071@pku.edu.cn>",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/koishijs/koishi.git"
+  },
+  "bugs": {
+    "url": "https://github.com/koishijs/koishi/issues"
+  },
+  "homepage": "https://koishi.js.org/plugins/dice.html",
+  "keywords": [
+    "bot",
+    "qqbot",
+    "cqhttp",
+    "coolq",
+    "chatbot",
+    "koishi",
+    "plugin",
+    "dice"
+  ],
+  "peerDependencies": {
+    "koishi-core": "^2.3.0",
+    "koishi-utils": "^3.1.5"
+  },
+  "devDependencies": {
+    "koishi-test-utils": "^5.0.1"
+  }
+}

packages/plugin-dice/src/index.ts

@@ -0,0 +1,10 @@
+import { Context } from 'koishi-core'
+import roll, { RollConfig } from './roll'
+
+export interface Config extends RollConfig {}
+
+export const name = 'dice'
+
+export function apply(ctx: Context, config: Config = {}) {
+  ctx.plugin(roll, config)
+}

packages/plugin-dice/src/roll.ts

@@ -0,0 +1,65 @@
+import { Context } from 'koishi-core'
+import { Random } from 'koishi-utils'
+
+export interface RollConfig {
+  maxPoint?: number
+  maxTimes?: number
+}
+
+export default function apply(ctx: Context, options: RollConfig = {}) {
+  const { maxPoint = 1 << 16, maxTimes = 64 } = options
+
+  ctx.command('tools/roll [expr]', '掷骰')
+    .userFields(['name', 'timers'])
+    .shortcut('掷骰', { fuzzy: true })
+    .example('roll 2d6+d10')
+    .action(async ({ session }, message = '1d6') => {
+      if (!/^((\d*)d)?(\d+)(\+((\d*)d)?(\d+))*$/i.test(message)) return '表达式语法错误。'
+
+      const expressions = message.split('+')
+      let hasMultiple = false
+      let output = `${session.$username} 掷骰：${message}=`
+      let total = 0
+
+      for (const expr of expressions) {
+        const [, dice, _times, _max] = /^((\d*)d)?(\d+)$/i.exec(expr)
+        const max = +_max
+        if (!max || max > maxPoint) {
+          return `点数必须在 1 到 ${maxPoint} 之间。`
+        }
+
+        if (!dice) {
+          output += max + '+'
+          total += max
+          continue
+        }
+
+        const times = +(_times || 1)
+        if (!times || times > maxTimes) {
+          return `次数必须在 1 到 ${maxTimes} 之间。`
+        }
+
+        const values = []
+        for (let index = 0; index < times; index += 1) {
+          const value = Random.int(max) + 1
+          values.push(value)
+          total += value
+        }
+        if (times > 1) hasMultiple = true
+        if (times > 1 && expressions.length > 1) {
+          output += '('
+        }
+        output += values.join('+')
+        if (times > 1 && expressions.length > 1) {
+          output += ')'
+        }
+        output += '+'
+      }
+
+      output = output.slice(0, -1)
+      if (hasMultiple || expressions.length > 1) {
+        output += '=' + total
+      }
+      return output
+    })
+}

packages/plugin-dice/tsconfig.json

@@ -0,0 +1,10 @@
+{
+  "extends": "../../tsconfig.base",
+  "compilerOptions": {
+    "outDir": "dist",
+    "rootDir": "src",
+  },
+  "include": [
+    "src",
+  ],
+}

tsconfig.json

@@ -21,6 +21,7 @@
 
     { "path": "./packages/plugin-chess" },
     { "path": "./packages/plugin-common" },
+    { "path": "./packages/plugin-dice" },
     { "path": "./packages/plugin-eval-addons" },
     { "path": "./packages/plugin-github" },
     { "path": "./packages/plugin-image-search" },