feat: automatically install Sprocket from GitHub releases. (#7)

* fix: fix verbose, information, and quiet levels for latest `sprocket` CLI.

* feat: automatically install Sprocket from GitHub releases.

This commit adds a feature to the VSCode extension to automatically download
the latest stable Sprocket from GitHub releases.

It does this by first querying `crates.io` for the latest stable `sprocket`
crate version; it then fetches the GitHub release artifact corresponding to
that version.

The extension will also check for newer versions to what has been previously
downloaded and prompt to download and update to the next version.

A new setting has been added to control checking for updates on startup.

* chore: format source.

* refactor: refactor the sprocket installation code.

This commit refactors the installation code to be a little more readable.

* fix: use `msvc` package for Windows.

Also fixes:

* SVG isn't allowed from the marketplace when building the extension.
* The asset path doesn't like the `./` prefix when building the extension.

README.md

@@ -4,7 +4,7 @@
 <p align="center">
   <p align="center">
     <a href="https://marketplace.visualstudio.com/items?itemName=stjude-rust-labs.sprocket-vscode">
-      <img src="https://vsmarketplacebadges.dev/version/stjude-rust-labs.sprocket-vscode.svg" alt="Visual Studio Marketplace">
+      <img src="https://vsmarketplacebadges.dev/version/stjude-rust-labs.sprocket-vscode.png" alt="Visual Studio Marketplace">
   </a>
     <a href="https://github.com/stjude-rust-labs/sprocket-vscode/blob/main/LICENSE-APACHE" target="_blank">
       <img alt="License: Apache 2.0" src="https://img.shields.io/badge/license-Apache 2.0-blue.svg" />

package.json

@@ -3,7 +3,7 @@
   "displayName": "Sprocket",
   "publisher": "stjude-rust-labs",
   "description": "Workflow Definition Language (WDL) support for Visual Studio Code",
-  "icon": "./assets/sprocket-logo-square.png",
+  "icon": "assets/sprocket-logo-square.png",
   "repository": {
     "type": "git",
     "url": "https://github.com/stjude-rust-labs/sprocket-vscode"
@@ -66,9 +66,14 @@
       {
         "title": "Sprocket",
         "properties": {
+          "sprocket.server.checkForUpdates": {
+            "type": "boolean",
+            "markdownDescription": "Whether or not to check for updates to the latest stable Sprocket release when the extension starts.",
+            "default": true
+          },
           "sprocket.server.path": {
             "type": "string",
-            "markdownDescription": "The path to the `sprocket` command line tool; defaults to finding `sprocket` on your PATH."
+            "markdownDescription": "The path to a locally installed Sprocket; defaults to automatically installing the latest stable Sprocket."
           },
           "sprocket.server.outputLevel": {
             "type": "string",
@@ -101,7 +106,15 @@
     "lint": "eslint src --ext ts",
     "test": "vscode-test"
   },
+  "extensionDependencies": [
+    "mindaro-dev.file-downloader"
+  ],
   "dependencies": {
+    "@microsoft/vscode-file-downloader-api": "^1.0.1",
+    "extract-zip": "^2.0.1",
+    "node-fetch": "2",
+    "semver": "^7.6.3",
+    "tar": "^7.4.3",
     "vscode-languageclient": "^9.0.1"
   },
   "devDependencies": {