nvim: lsp: Enable rust-tools for inlay hints

nvim/.config/nvim/after/ftplugin/rust.vim

@@ -0,0 +1,12 @@
+nnoremap <buffer> <Leader>rD :RustDisableInlayHints<CR>
+nnoremap <buffer> <Leader>rt :RustToggleInlayHints<CR>
+nnoremap <buffer> <Leader>rr :RustRunnables<CR>
+nnoremap <buffer> <Leader>rm :RustExpandMacro<CR>
+nnoremap <buffer> <Leader>rc :RustOpenCargo<CR>
+nnoremap <buffer> <Leader>rp :RustParentModule<CR>
+nnoremap <buffer> <Leader>rj :RustJoinLines<CR>
+nnoremap <buffer> <Leader>rh :RustHoverActions<CR>
+nnoremap <buffer> <Leader>rd :RustMoveItemDown<CR>
+nnoremap <buffer> <Leader>ru :RustMoveItemUp<CR>
+nnoremap <buffer> <Leader>rs :RustStartStandaloneServerForBuffer<CR>
+nnoremap <buffer> <Leader>rg :RustViewCrateGraph<CR>

nvim/.config/nvim/lua/lsp.lua

@@ -176,7 +176,7 @@ end
 null_ls.config {}
 nvim_lsp["null-ls"].setup {}
 
-local servers = { 'hls', 'rust_analyzer', 'pylsp', 'tsserver' }
+local servers = { 'hls', 'pylsp', 'tsserver' }
 for _, lsp in ipairs(servers) do
   nvim_lsp[lsp].setup {
     on_attach = on_attach,
@@ -199,6 +199,45 @@ nvim_lsp.clangd.setup {
   }
 }
 
+local rust_tool_opts = {
+  tools = {
+    autoSetHints       = true,
+    hover_with_actions = false,
+    runnables          = { use_telescope = false },
+    debuggables        = { use_telescope = false },
+    inlay_hints = {
+      only_current_line         = false,
+      only_current_line_autocmd = "CursorHold",
+      show_parameter_hints      = true,
+      parameter_hints_prefix    = "<- ",
+      other_hints_prefix        = "=> ",
+      other_hints_prefix        = "",
+      highlight                 = "Hint",
+    },
+    hover_actions = {
+      auto_focus = true
+    },
+    crate_graph = {
+      backend = "svg",
+      output  = "crates_graph.svg",
+      full    = false,
+    }
+  },
+  server = {
+    on_attach    = on_attach,
+    capabilities = set_snippet_capabilities(),
+    settings = {
+      ["rust-analyzer"] = {
+        checkOnSave = {
+          command = "clippy"
+        },
+      }
+    }
+  },
+}
+
+require('rust-tools').setup(rust_tool_opts)
+
 -- See https://github.com/sumneko/lua-language-server/wiki/Setting-without-VSCode#neovim-with-built-in-lsp-client
 -- on why we do this library thing
 -- Idea taken from https://gist.github.com/folke/fe5d28423ea5380929c3f7ce674c41d8

nvim/.config/nvim/lua/plugins.lua

@@ -81,6 +81,7 @@ local init = function ()
     'kosayoda/nvim-lightbulb',
   }
   -- Language support & syntax highlighting
+  use 'simrat39/rust-tools.nvim'
   -- Coq
   use {
     'whonore/Coqtail',