feat: suggestion-bot

.editorconfig

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+root = true
+
+[*]
+indent_style = space
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.{js,json,sh,ts,yml}]
+indent_size = 2
+max_line_length = 80
+guidelines = 80

.eslintrc.json

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+{
+  "env": {
+    "es6": true,
+    "node": true
+  },
+  "extends": ["eslint:recommended"],
+  "globals": {
+    "Atomics": "readonly",
+    "SharedArrayBuffer": "readonly"
+  },
+  "parserOptions": {
+    "ecmaFeatures": {
+      "jsx": true
+    },
+    "ecmaVersion": 2018,
+    "sourceType": "module"
+  },
+  "plugins": ["prettier"],
+  "rules": {
+    "prettier/prettier": "error"
+  }
+}

.gitattributes

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+* text=auto

.github/workflows/build.yml

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+name: build
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Set up Node.js
+        uses: actions/setup-node@v1
+        with:
+          node-version: 12
+      - name: Cache /node_modules
+        uses: actions/cache@v2
+        with:
+          path: node_modules
+          key: ${{ runner.os }}-${{ hashFiles('yarn.lock') }}
+      - name: Install
+        run: yarn
+      - name: Lint
+        run: yarn lint
+      - name: Release
+        env:
+          GITHUB_TOKEN: ${{ secrets.GH_TOKEN }}
+          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
+        run: npx semantic-release

.gitignore

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+*.tgz
+node_modules/

.npmignore

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+*.tgz
+.editorconfig
+.eslintrc.json
+.gitattributes
+.github/

LICENSE

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+MIT License
+
+Copyright (c) 2020 Tommy Nguyen
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# suggestion-bot
+
+`suggestion-bot` submits code reviews with suggestions based on your diffs.

cli.js

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+#!/usr/bin/env node
+
+//
+// Copyright (c) Tommy Nguyen
+//
+// This source code is licensed under the MIT license found in the
+// LICENSE file in the root directory of this source tree.
+//
+
+const { [2]: diff } = process.argv;
+require("./index")(diff);

index.js

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+//
+// Copyright (c) Tommy Nguyen
+//
+// This source code is licensed under the MIT license found in the
+// LICENSE file in the root directory of this source tree.
+//
+
+/**
+ * Returns the pull request number of the current build.
+ * @returns {number}
+ */
+function getPullRequestNumber() {
+  const fs = require("fs");
+  const e = JSON.parse(fs.readFileSync(process.env.GITHUB_EVENT_PATH, "utf8"));
+  return e.pull_request.number;
+}
+
+/**
+ * Creates a comment that can be submitted to GitHub.
+ * @param {string} file
+ * @param {{
+     changes: ({ type: "add" | "del" | "normal"; content: string; })[];
+     oldStart: number;
+     oldLines: number;
+   }} chunk
+ * @returns {{
+     path: string;
+     line: number;
+     side: "LEFT" | "RIGHT";
+     start_line?: number;
+     start_side?: "LEFT" | "RIGHT";
+     body: string;
+   }}
+ */
+function makeComment(file, { changes, oldStart, oldLines }) {
+  const context =
+    changes.reduce(
+      (count, line) => (line.type === "normal" ? count + 1 : count),
+      0
+    ) / 2;
+  const line = oldStart + oldLines - context - 1;
+  const startLine = oldStart + context;
+  return {
+    path: file,
+    line,
+    side: "RIGHT",
+    ...(startLine !== line
+      ? {
+          start_line: startLine,
+          start_side: "RIGHT",
+        }
+      : undefined),
+    body: [
+      "```suggestion",
+      changes
+        .filter((line) => line.type === "add")
+        .map((line) => line.content.slice(1))
+        .join("\n"),
+      "```",
+      "",
+    ].join("\n"),
+  };
+}
+
+/**
+ * Submits a code review with suggestions with specified diff.
+ * @param {string} diff
+ */
+function suggest(diff) {
+  const parse = require("parse-diff");
+  const files = parse(diff);
+  if (files.length <= 0) {
+    return process.exit(0);
+  }
+
+  const { GITHUB_REPOSITORY, GITHUB_TOKEN } = process.env;
+
+  const { Octokit } = require("@octokit/rest");
+  const octokit = new Octokit({ auth: GITHUB_TOKEN });
+
+  const [owner, repo] = GITHUB_REPOSITORY.split("/");
+  const review = {
+    accept: "application/vnd.github.comfort-fade-preview+json",
+    owner,
+    repo,
+    pull_number: getPullRequestNumber(),
+    event: "COMMENT",
+    comments: files.reduce((comments, file) => {
+      const { chunks, to } = file;
+      return chunks.reduce((comments, chunk) => {
+        comments.push(makeComment(to, chunk));
+        return comments;
+      }, comments);
+    }, []),
+  };
+  octokit.pulls.createReview(review).catch((e) => {
+    console.error(e);
+    console.dir(review, undefined, { depth: null });
+    return process.exit(1);
+  });
+}
+
+module.exports = suggest;

package.json

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+{
+  "name": "suggestion-bot",
+  "license": "MIT",
+  "author": {
+    "name": "Tommy Nguyen",
+    "email": "tn0502@gmail.com"
+  },
+  "main": "index.js",
+  "bin": "cli.js",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/tido64/suggestion-bot.git"
+  },
+  "version": "0.0.1-dev",
+  "description": "suggestion-bot submits code reviews with suggestions based on your diffs",
+  "keywords": [
+    "code review",
+    "diff",
+    "github",
+    "pull request",
+    "review",
+    "suggestion"
+  ],
+  "homepage": "https://github.com/tido64/suggestion-bot",
+  "scripts": {
+    "format": "prettier --write $(git ls-files '*.js' '*.yml')",
+    "lint": "eslint $(git ls-files '*.js')"
+  },
+  "dependencies": {
+    "@octokit/rest": "^17.0.0",
+    "parse-diff": "^0.7.0"
+  },
+  "devDependencies": {
+    "eslint": "^7.5.0",
+    "eslint-plugin-prettier": "^3.1.4",
+    "prettier": "2.0.5",
+    "semantic-release": "^17.0.0"
+  },
+  "release": {
+    "tagFormat": "${version}"
+  }
+}