LanguageClient: Automate setup of rust-analyzer

Change-Id: I6f97840ec55675219071d4a9644b8cba7f70f24e
Reviewed-by: Marcus Tillmanns <marcus.tillmanns@qt.io>

src/plugins/CMakeLists.txt

@@ -122,3 +122,4 @@ add_subdirectory(qtapplicationmanager)
 add_subdirectory(luatests)
 add_subdirectory(tellajoke)
 add_subdirectory(lualsp)
+add_subdirectory(rustls)

src/plugins/rustls/CMakeLists.txt

@@ -0,0 +1,4 @@
+add_qtc_lua_plugin(rustls
+    SOURCES rustls/rustls.lua
+            rustls/init.lua
+)

src/plugins/rustls/rustls/init.lua

@@ -0,0 +1,176 @@
+-- Copyright (C) 2024 The Qt Company Ltd.
+-- SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+local LSP = require('LSP')
+local mm = require('MessageManager')
+local Utils = require('Utils')
+local Process = require('Process')
+local S = require('Settings')
+local Layout = require('Layout')
+local a = require('async')
+local fetch = require('Fetch').fetch
+
+Settings = {}
+
+local function createCommand()
+  local cmd = { Settings.binary.expandedValue:nativePath() }
+  return cmd
+end
+
+local function filter(tbl, callback)
+  for i = #tbl, 1, -1 do
+    if not callback(tbl[i]) then
+      table.remove(tbl, i)
+    end
+  end
+end
+
+local function installOrUpdateServer()
+  local data = a.wait(fetch({
+    url = "https://api.github.com/repos/rust-lang/rust-analyzer/releases?per_page=2",
+    convertToTable = true,
+    headers = {
+      Accept = "application/vnd.github.v3+json",
+      ["X-GitHub-Api-Version"] = "2022-11-28"
+    }
+  }))
+
+  if type(data) == "table" and #data > 1 then
+    local r = data[1]
+    if r.prerelease then
+      r = data[2]
+    end
+    Install = require('Install')
+    local lspPkgInfo = Install.packageInfo("rust-analyzer")
+    if not lspPkgInfo or lspPkgInfo.version ~= r.tag_name then
+      local osTr = { mac = "apple-darwin", windows = "pc-windows-msvc", linux = "unknown-linux-gnu" }
+      local archTr = { unknown = "", x86 = "", x86_64 = "x86_64", itanium = "", arm = "", arm64 = "aarch64" }
+      local extTr = { mac = "gz", windows = "zip", linux = "gz" }
+      local os = osTr[Utils.HostOsInfo.os]
+      local arch = archTr[Utils.HostOsInfo.architecture]
+      local ext = extTr[Utils.HostOsInfo.os]
+
+      local expectedFileName = "rust-analyzer-" .. arch .. "-" .. os .. "." .. ext
+
+      filter(r.assets, function(asset)
+        return string.find(asset.name, expectedFileName, 1, true) == 1
+      end)
+
+      if #r.assets == 0 then
+        print("No assets found for this platform")
+        return
+      end
+      local res, err = a.wait(Install.install(
+        "Do you want to install the rust-analyzer?", {
+        name = "rust-analyzer",
+        url = r.assets[1].browser_download_url,
+        version = r.tag_name
+      }))
+
+      if not res then
+        mm.writeFlashing("Failed to install rust-analyzer: " .. err)
+        return
+      end
+
+      lspPkgInfo = Install.packageInfo("rust-analyzer")
+      print("Installed:", lspPkgInfo.name, "version:", lspPkgInfo.version, "at", lspPkgInfo.path)
+    end
+
+    local binary = "rust-analyzer"
+    if Utils.HostOsInfo.isWindowsHost() then
+      binary = "rust-analyzer.exe"
+    end
+
+    Settings.binary.defaultPath = lspPkgInfo.path:resolvePath(binary)
+    Settings:apply()
+    return
+  end
+
+  if type(data) == "string" then
+    print("Failed to fetch:", data)
+  else
+    print("No rust-analyzer release found.")
+  end
+end
+IsTryingToInstall = false
+
+local function setupClient()
+  Client = LSP.Client.create({
+    name = 'Rust Language Server',
+    cmd = createCommand,
+    transport = 'stdio',
+    languageFilter = {
+      patterns = { '*.rs' },
+      mimeTypes = { 'text/rust' }
+    },
+    settings = Settings,
+    startBehavior = "RequiresProject",
+    onStartFailed = function()
+      a.sync(function()
+        if IsTryingToInstall == true then
+          return
+        end
+        IsTryingToInstall = true
+        installOrUpdateServer()
+        IsTryingToInstall = false
+      end)()
+    end
+  })
+end
+
+local function using(tbl)
+  local result = _G
+  for k, v in pairs(tbl) do result[k] = v end
+  return result
+end
+local function layoutSettings()
+  --- "using namespace Layout"
+  local _ENV = using(Layout)
+
+  local layout = Form {
+    Settings.binary, br,
+    Row {
+      PushButton {
+        text("Try to install Rust language server"),
+        onClicked(function() a.sync(installOrUpdateServer)() end),
+        br,
+      },
+      st
+    }
+  }
+
+  return layout
+end
+
+local function setupAspect()
+  ---@class Settings: AspectContainer
+  Settings = S.AspectContainer.create({
+    autoApply = false,
+    layouter = layoutSettings,
+  });
+
+  Settings.binary = S.FilePathAspect.create({
+    settingsKey = "Rustls.Binary",
+    displayName = "Binary",
+    labelText = "Binary:",
+    toolTip = "The path to the rust analyzer binary.",
+    expectedKind = S.Kind.ExistingCommand,
+    defaultPath = Utils.FilePath.fromUserInput("rust-analyzer"),
+  })
+  -- Search for the binary in the PATH
+  local serverPath = Settings.binary.defaultPath
+  local absolute = a.wait(serverPath:searchInPath()):resolveSymlinks()
+  if absolute:isExecutableFile() == true then
+    Settings.binary.defaultPath = absolute
+  end
+
+  return Settings
+end
+
+local function setup(parameters)
+  setupAspect()
+  setupClient()
+end
+
+return {
+  setup = function() a.sync(setup)() end,
+}

src/plugins/rustls/rustls/rustls.lua

@@ -0,0 +1,24 @@
+-- Copyright (C) 2024 The Qt Company Ltd.
+-- SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+return {
+    Name = "RustLanguageServer",
+    Version = "1.0.0",
+    CompatVersion = "1.0.0",
+    Vendor = "The Qt Company",
+    Category = "Language Client",
+    Description = "The Rust Language Server",
+    Experimental = false,
+    DisabledByDefault = false,
+    LongDescription = [[
+This plugin provides the Rust Language Server.
+It will try to install it if it is not found.
+    ]],
+    Dependencies = {
+        { Name = "Core",              Version = "13.0.82", Required = true },
+        { Name = "Lua",               Version = "13.0.82", Required = true },
+        { Name = "LuaLanguageClient", Version = "13.0.82", Required = true }
+    },
+    setup = function()
+        require 'init'.setup()
+    end,
+} --[[@as QtcPlugin]]