nvim: select diagnostic virtual text severity with custom telescope picker

config/nvim/lua/fschauen/diagnostic.lua

@@ -54,25 +54,81 @@ end
 ---@param bufnr integer|nil: Buffer number (0 for current buffer, nil for all buffers.
 M.hide = function(bufnr) vim.diagnostic.hide(nil, bufnr or 0) end
 
+local icons = require("fschauen.util.icons")
+
+---Select minimum diagnostic severity for which to show virtual text.
 M.select_virtual_text_severity = function()
-  vim.ui.select(
+  if not pcall(require, "telescope") then
-    { "ERROR", "WARN", "INFO", "HINT" },
+    vim.notify("Telescope not available!", vim.log.levels.ERROR)
-    { prompt = "Min. severity for virtual text:" },
+    return
-    function(choice)
+  end
-      if choice then
+
-        M.severity = vim.diagnostic.severity[choice] or M.severity
+  local display_row = require("telescope.pickers.entry_display").create {
+    separator = "",
+    items = { { width = 3 }, { remaining = true } },
+  }
+
+  local make_display = function(entry)
+    return display_row {
+      { entry.value.icon, entry.value.highlight },
+      { entry.value.title, entry.value.highlight },
+    }
+  end
+
+  local opts = require("telescope.themes").get_dropdown()
+  require("telescope.pickers")
+    .new(opts, {
+      prompt_title = "Min. severity for virtual text:",
+      finder = require("telescope.finders").new_table {
+        results = {
+          {
+            title = "Error",
+            severity = vim.diagnostic.severity.ERROR,
+            icon = icons.diagnostics_bold.Error,
+            highlight = "DiagnosticError",
+          },
+          {
+            title = "Warning",
+            severity = vim.diagnostic.severity.WARN,
+            icon = icons.diagnostics_bold.Warn,
+            highlight = "DiagnosticWarn",
+          },
+          {
+            title = "Info",
+            severity = vim.diagnostic.severity.INFO,
+            icon = icons.diagnostics_bold.Info,
+            highlight = "DiagnosticInfo",
+          },
+          {
+            title = "Hint",
+            severity = vim.diagnostic.severity.HINT,
+            icon = icons.diagnostics_bold.Hint,
+            highlight = "DiagnosticHint",
+          },
+        },
+        entry_maker = function(entry)
+          return { value = entry, ordinal = entry.title, display = make_display }
+        end,
+      },
+      sorter = require("telescope.config").values.generic_sorter(opts),
+      attach_mappings = function(prompt_bufnr, _)
+        local actions = require("telescope.actions")
+        actions.select_default:replace(function()
+          actions.close(prompt_bufnr)
+          local selection = require("telescope.actions.state").get_selected_entry()
+          M.severity = selection.value.severity or M.severity
           vim.diagnostic.config {
             virtual_text = {
               severity = { min = M.severity },
             },
           }
-      end
+        end)
-    end
+        return true
-  )
+      end,
+    })
+    :find()
 end
 
-local icons = require("fschauen.util.icons")
-
 ---Customize nvim's diagnostics display.
 M.setup = function()
   vim.diagnostic.config {