Files I've added

This still won't work, still a WIP

.buildkite/pipeline.yaml

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+steps:
+  - label: ":eslint: Lint"
+    command:
+      - "yarn install"
+      - "yarn lint"
+    plugins:
+      - docker#v3.0.1:
+          image: "node:10"

.eslintrc.js

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+const jsSdkEslintCfg = require('matrix-js-sdk/.eslintrc');
+
+module.exports = {
+    parserOptions: {
+        ecmaVersion: 8,
+    },
+    env: {
+        node: true,
+        // we also have some browser code (ie. the preload script)
+        browser: true,
+    },
+    extends: ["eslint:recommended", "google"],
+    rules: jsSdkEslintCfg.rules,
+}
+
+// js-sdk uses a babel rule which we can't use because we
+// don't use babel, so remove it & put the original back
+delete module.exports.rules["babel/no-invalid-this"];
+module.exports.rules["no-invalid-this"] = "error";

README

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+Riot Desktop
+============
+
+This is *not* where the source for Riot desktop lives... yet. As of now,
+it still lives in the main riot-web repo: https://github.com/vector-im/riot-web
+
+This is an experimental split-out of the riot desktop code from the main repo.

package.json

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+{
+  "name": "riot-desktop",
+  "productName": "Riot",
+  "main": "src/electron-main.js",
+  "version": "1.5.5",
+  "description": "A feature-rich client for Matrix.org",
+  "author": "New Vector Ltd.",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/vector-im/riot-desktop"
+  },
+  "license": "Apache-2.0",
+  "files": [],
+  "scripts": {
+    "mkdirs": "mkdir -p packages && mkdir -p deploys",
+    "fetch": "yarn run mkdirs && scripts/fetch-package.js",
+    "check": "scripts/check-webapp.js",
+    "start": "yarn run check && yarn install:electron && electron .",
+    "install:electron": "electron-builder install-app-deps",
+    "lint": "eslint src/",
+    "build:electron:linux": "yarn check && electron-builder -l --x64",
+    "build:electron:macos": "yarn check && electron-builder -m --x64",
+    "build:electron:windows": "yarn check && electron-builder -w --ia32 --x64",
+    "clean": "rimraf webapp dist packages deploys"
+  },
+  "dependencies": {
+    "auto-launch": "^5.0.1",
+    "electron-store": "^2.0.0",
+    "electron-window-state": "^4.1.0",
+    "minimist": "^1.2.0",
+    "png-to-ico": "^1.0.2"
+  },
+  "devDependencies": {
+    "electron-builder": "^21.2.0",
+    "electron-builder-squirrel-windows": "^21.2.0",
+    "electron-devtools-installer": "^2.2.4",
+    "electron-notarize": "^0.2.0",
+    "eslint": "^5.8.0",
+    "eslint-config-google": "^0.7.1",
+    "eslint-plugin-babel": "^4.1.2",
+    "follow-redirects": "^1.9.0",
+    "matrix-js-sdk": "^2.4.6-rc.1",
+    "tar": "^5.0.5"
+  },
+  "build": {
+    "appId": "im.riot.app",
+    "electronVersion": "7.1.3",
+    "files": [
+      "node_modules/**",
+      "src/**"
+    ],
+    "extraResources": [
+      {
+        "from": "res/img",
+        "to": "img"
+      },
+      "webapp/**/*"
+    ],
+    "linux": {
+      "target": "deb",
+      "category": "Network;InstantMessaging;Chat",
+      "maintainer": "support@riot.im",
+      "desktop": {
+        "StartupWMClass": "riot"
+      }
+    },
+    "deb": {
+      "afterInstall": "build/linux/after-install.tpl"
+    },
+    "mac": {
+      "category": "public.app-category.social-networking",
+      "darkModeSupport": true
+    },
+    "win": {
+      "target": {
+        "target": "squirrel"
+      },
+      "sign": "scripts/electron_winSign"
+    },
+    "directories": {
+      "buildResources": "electron_app/build",
+      "output": "dist"
+    },
+    "afterSign": "scripts/electron_afterSign.js"
+  }
+}

scripts/check-webapp.js

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+#!/usr/bin/env node
+
+const fs = require('fs').promises;
+
+async function main() {
+    try {
+        const webappDir = await fs.opendir('webapp');
+        return 0;
+    } catch (e) {
+        console.log("No 'webapp' directory found. Run 'yarn run fetch' or symlink manually");
+        return 1;
+    }
+}
+
+main().then((ret) => process.exit(ret));

scripts/fetch-package.js

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+#!/usr/bin/env node
+
+const process = require('process');
+const path = require('path');
+const fs = require('fs');
+const fsPromises = require('fs').promises;
+const { https } = require('follow-redirects');
+const child_process = require('child_process');
+const tar = require('tar');
+
+const riotDesktopPackageJson = require('../package.json');
+
+const PUBKEYURL = "https://packages.riot.im/riot-release-key.asc";
+const PACKAGE_URL_PREFIX = "https://github.com/vector-im/riot-web/releases/download/";
+
+async function downloadToFile(url, filename) {
+    console.log("Downloading " + url + "...");
+    const outStream = await fs.createWriteStream(filename);
+
+    return new Promise((resolve, reject) => {
+        https.get(url, (resp) => {
+            if (resp.statusCode / 100 !== 2) {
+                reject("Download failed: " + resp.statusCode);
+                return;
+            }
+
+            resp.on('data', (chunk) => {
+                outStream.write(chunk);
+            });
+            resp.on('end', (chunk) => {
+                outStream.end();
+                resolve();
+            });
+        });
+    }).catch(async (e) => {
+        outStream.end();
+        await fsPromises.unlink(filename);
+        throw e;
+    });
+}
+
+async function verifyFile(filename) {
+    return new Promise((resolve, reject) => {
+        const gpgProc = child_process.execFile('gpg', ['--verify', filename + '.asc', filename], (error) => {
+            if (error) {
+                reject(error);
+            } else {
+                resolve();
+            }
+        });
+    });
+}
+
+async function main() {
+    let verify = true;
+    let importkey = false;
+    let pkgDir = 'packages';
+    let deployDir = 'deploys';
+    let targetVersion;
+
+    while (process.argv.length > 2) {
+        switch (process.argv[2]) {
+            case '--noverify':
+                verify = false;
+                break;
+            case '--importkey':
+                importkey = true;
+                break;
+            case '--packages':
+                process.argv.shift();
+                pkgDir = process.argv[2];
+                break;
+            case '--deploys':
+                process.argv.shift();
+                deployDir = process.argv[2];
+                break;
+            default:
+                targetVersion = process.argv[2];
+        }
+        process.argv.shift();
+    }
+
+    if (targetVersion === undefined) {
+        targetVersion = 'v' + riotDesktopPackageJson.version;
+    }
+
+    const haveGpg = await new Promise((resolve) => {
+        child_process.execFile('gpg', ['--version'], (error) => {
+            resolve(!error);
+        });
+    });
+
+    if (importkey) {
+        if (!haveGpg) {
+            console.log("Can't import key without working GPG binary: install GPG and try again");
+            return 1;
+        }
+
+        await new Promise((resolve) => {
+            const gpgProc = child_process.execFile('gpg', ['--import'], (error) => {
+                if (error) {
+                    console.log("Failed to import key", error);
+                } else {
+                    console.log("Key imported!");
+                }
+                resolve(!error);
+            });
+            https.get(PUBKEYURL, (resp) => {
+                resp.on('data', (chunk) => {
+                    gpgProc.stdin.write(chunk);
+                });
+                resp.on('end', (chunk) => {
+                    gpgProc.stdin.end();
+                });
+            });
+        });
+    }
+        
+    if (verify && !haveGpg) {
+        console.log("No working GPG binary: install GPG or pass --noverify to skip verification");
+        return 1;
+    }
+
+    const haveDeploy = false;
+    const expectedDeployDir = path.join(deployDir, 'riot-' + targetVersion);
+    try {
+        const webappDir = await fs.opendir(expectedDeployDir);
+        console.log(expectedDeployDir + "already exists");
+        haveDeploy = true;
+    } catch (e) {
+    }
+
+    if (!haveDeploy) {
+        const filename = 'riot-' + targetVersion + '.tar.gz';
+        const outPath = path.join(pkgDir, filename);
+        const url = PACKAGE_URL_PREFIX + targetVersion + '/' + filename;
+        try {
+            await fsPromises.stat(outPath);
+            console.log("Already have " + filename + ": not redownloading");
+        } catch (e) {
+            try {
+                await downloadToFile(url, outPath);
+            } catch (e) {
+                console.log("Failed to download " + url, e);
+                return 1;
+            }
+        }
+
+        if (verify) {
+            try {
+                await fsPromises.stat(outPath+'.asc');
+                console.log("Already have " + filename + ".asc: not redownloading");
+            } catch (e) {
+                try {
+                    await downloadToFile(url + '.asc', outPath + '.asc');
+                } catch (e) {
+                    console.log("Failed to download " + url, e);
+                    return 1;
+                }
+            }
+
+            try {
+                await verifyFile(outPath);
+                console.log(outPath + " downloaded and verified");
+            } catch (e) {
+                console.log("Signature verification failed!", e);
+                return 1;
+            }
+        } else {
+            console.log(outPath + " downloaded but NOT verified");
+        }
+
+        await tar.x({
+            file: outPath,
+            cwd: deployDir,
+        });
+    }
+
+    console.log("Symlink " + expectedDeployDir + " -> webapp");
+    // Does this do a sensible thing on Windows?
+    await fsPromises.symlink(expectedDeployDir, 'webapp');
+}
+
+main().then((ret) => process.exit(ret));