nvim: Add telescope to switch rust-analyzer target

tree/.config/nvim/init.lua

@@ -4,10 +4,14 @@ vim.g.localleader = "\\"
 require('plugins')
 require('vars')
 require('opts')
+require('fns')
 require('keys')
 require('theme')
 require('statusline')
 
+local lspconfig = require("lspconfig")
+local rust_tools = require("rust-tools")
+
 -- Mason Setup
 require("mason").setup({
     ui = {
@@ -20,21 +24,25 @@ require("mason").setup({
     ensure_installed = { "pylsp", "rust_analyzer" },
 })
 require("mason-lspconfig").setup()
-require("lspconfig").pylsp.setup {}
+lspconfig.pylsp.setup {}
+lspconfig.rust_analyzer.setup {}
 
 require("auto-save").setup({
   enabled = false
 })
 
-local rt = require("rust-tools")
-rt.setup({
+
+rust_tools.setup({
   server = {
     on_attach = function(_, bufnr)
       -- Hover actions
-      vim.keymap.set("n", "<C-space>", rt.hover_actions.hover_actions, { buffer = bufnr })
+      vim.keymap.set("n", "<C-space>", rust_tools.hover_actions.hover_actions, { buffer = bufnr })
       -- Code action groups
-      vim.keymap.set("n", "<Leader>a", rt.code_action_group.code_action_group, { buffer = bufnr })
+      vim.keymap.set("n", "<Leader>a", rust_tools.code_action_group.code_action_group, { buffer = bufnr })
     end,
+    settings = {
+      ["rust-analyzer"] = {},
+    }
   },
 })
 

tree/.config/nvim/lua/fns.lua

@@ -0,0 +1,26 @@
+-- change rust-analyzer target
+set_rust_target = function(target)
+    print("rust-analyzer.cargo.target = " .. target)
+    require("rust-tools").setup({
+      server = { settings = { ["rust-analyzer"] = { cargo = { target = target } } } },
+    })
+end
+
+-- a custom telescope picker for changing rust-analyzer target
+pick_rust_target = function(opts)
+  opts = opts or {}
+  require("telescope.pickers").new(opts, {
+    prompt_title = "rustup target list --installed",
+    finder = require("telescope.finders").new_oneshot_job({ "rustup", "target", "list", "--installed" }, opts ),
+    sorter = require("telescope.config").values.generic_sorter(opts),
+    attach_mappings = function(prompt_bufnr, map)
+      local actions = require("telescope.actions")
+      actions.select_default:replace(function()
+        actions.close(prompt_bufnr)
+        local selection = require("telescope.actions.state").get_selected_entry()
+        set_rust_target(selection[1])
+      end)
+      return true
+    end,
+  }):find()
+end

tree/.config/nvim/lua/keys.lua

@@ -4,6 +4,7 @@ vim.keymap.set('n', '<leader>fg', telescope.live_grep, {})
 vim.keymap.set('n', '<leader>fb', telescope.buffers, {})
 vim.keymap.set('n', '<leader>fh', telescope.help_tags, {})
 vim.keymap.set('n', '<leader>fs', telescope.treesitter, {}) -- find symbols
+vim.keymap.set('n', '<leader>ft', pick_rust_target, {}) -- find symbols
 vim.keymap.set('n', 'U', ":redo<Enter>", {})
 vim.keymap.set('n', '<leader>p', ":b#<Enter>", {}) -- goto previous buffer