Setup LSP for Rust

lua/config/lsp.lua

@@ -278,6 +278,32 @@ if utils.executable("lua-language-server") then
   }
 end
 
+-- settings for rust-analyzer is copied from https://rust-analyzer.github.io/manual.html#nvim-lsp
+if utils.executable("rust-analyzer") then
+  lspconfig.rust_analyzer.setup {
+    on_attach = custom_attach,
+    settings = {
+      ['rust-analyzer'] = {
+        imports = {
+          granularity = {
+            group = "module",
+          },
+          prefix = "self",
+        },
+        cargo = {
+          buildScripts = {
+            enable = true,
+          },
+        },
+        procMacro = {
+          enable = true
+        },
+      },
+    },
+    capabilities = capabilities,
+  }
+end
+
 -- Change diagnostic signs.
 fn.sign_define("DiagnosticSignError", { text = "🆇", texthl = "DiagnosticSignError" })
 fn.sign_define("DiagnosticSignWarn", { text = "⚠️", texthl = "DiagnosticSignWarn" })

lua/custom-autocmd.lua

@@ -54,6 +54,13 @@ api.nvim_create_autocmd({ "BufWritePre" }, {
   end,
 })
 
+api.nvim_create_autocmd({ "BufWritePre" }, {
+  pattern = {"*.c", "*.cc", "*.cpp", "*.h", "*.rs", "*.py"},
+  callback = function()
+    vim.lsp.buf.format { asnyc = false }
+  end,
+})
+
 -- Automatically reload the file if it is changed outside of Nvim, see https://unix.stackexchange.com/a/383044/221410.
 -- It seems that `checktime` does not work in command line. We need to check if we are in command
 -- line before executing this command, see also https://vi.stackexchange.com/a/20397/15292 .