nvim: plugins: Drop rust-tools & use lsp-inlayhints

We do not use any of the other features provided by rust-tools and
only ever needed the inlay hints. Now that there is a plugin for
that which also allows us to use inlay hints for other languages
use that.

There are two options
https://github.com/lvimuser/lsp-inlayhints.nvim
https://github.com/simrat39/inlay-hints.nvim

The second one is from the rust-tools author himself but we could
not get that to work.

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

@@ -1,18 +1,6 @@
 compiler cargo
 setlocal makeprg=cargo\ build\ --all
 
-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> cbb :Dispatch! cargo build<CR> 
 nnoremap <buffer> cbc :Dispatch! cargo clean<CR> 
 nnoremap <buffer> cbd :Dispatch! cargo doc<CR> 

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

@@ -2,6 +2,14 @@ local nvim_lsp   = require 'lspconfig'
 local protocol   = require 'vim.lsp.protocol'
 local util       = require 'lspconfig/util'
 local lightbulb  = require 'nvim-lightbulb'
+local inlay_hint = require 'lsp-inlayhints'
+
+-- Set up inlay hints
+inlay_hint.setup({
+  inlay_hints = {
+    highlight = "Hint"
+  }
+})
 
 -- https://github.com/neovim/nvim-lspconfig/wiki/User-contributed-tips
 function FormatRangeOperator()
@@ -147,6 +155,8 @@ local on_attach = function(client, bufnr)
       })
     end
   end
+
+  inlay_hint.on_attach(bufnr, client)
 end
 
 local on_init = function(client)
@@ -162,40 +172,6 @@ capabilities.textDocument.completion.completionItem.resolveSupport = {
   properties = { 'documentation', 'detail', 'additionalTextEdits', }
 }
 
-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        = "=> ",
-      highlight                 = "Hint",
-    },
-    hover_actions = {
-      auto_focus = true
-    },
-  },
-  server = {
-    on_init      = on_init,
-    on_attach    = on_attach,
-    capabilities = capabilities,
-    settings = {
-      ["rust-analyzer"] = {
-        checkOnSave = {
-          command = "clippy"
-        },
-      }
-    }
-  },
-}
-
-require('rust-tools').setup(rust_tool_opts)
-
 local servers = {
   clangd = {
     default_config = {
@@ -227,7 +203,44 @@ local servers = {
       },
     },
   },
-  tsserver = {},
+  rust_analyzer = {
+    settings = {
+      ["rust-analyzer"] = {
+        procMacro = {
+          enable = true
+        },
+        checkOnSave = {
+          command = "clippy"
+        },
+      }
+    }
+  },
+  tsserver = {
+    settings = {
+      typescript = {
+        inlayHints = {
+          includeInlayParameterNameHints = 'all',
+          includeInlayParameterNameHintsWhenArgumentMatchesName = false,
+          includeInlayFunctionParameterTypeHints = true,
+          includeInlayVariableTypeHints = true,
+          includeInlayPropertyDeclarationTypeHints = true,
+          includeInlayFunctionLikeReturnTypeHints = true,
+          includeInlayEnumMemberValueHints = true,
+        }
+      },
+      javascript = {
+        inlayHints = {
+          includeInlayParameterNameHints = 'all',
+          includeInlayParameterNameHintsWhenArgumentMatchesName = false,
+          includeInlayFunctionParameterTypeHints = true,
+          includeInlayVariableTypeHints = true,
+          includeInlayPropertyDeclarationTypeHints = true,
+          includeInlayFunctionLikeReturnTypeHints = true,
+          includeInlayEnumMemberValueHints = true,
+        }
+      }
+    }
+  },
 }
 
 for client, config in pairs(servers) do

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

@@ -69,7 +69,7 @@ local init = function ()
   }
   -- Language support & syntax highlighting
   use 'mfussenegger/nvim-lint'
-  use 'simrat39/rust-tools.nvim'
+  use 'lvimuser/lsp-inlayhints.nvim'
   -- treesitter based syntax highlighting
   use {
     'nvim-treesitter/nvim-treesitter',