nvim: improve diagnostic severity selection

config/nvim/lua/fschauen/diagnostic.lua

@@ -21,63 +21,25 @@ M.hide = function(bufnr) vim.diagnostic.hide(nil, bufnr or 0) end
 
 local icons = require("fschauen.util.icons")
 
-local diagnostics_opts = function(severity)
-  severity = severity or vim.diagnostic.severity.WARN
-  return {
-    underline = false,
-
-    virtual_text = {
-      spacing = 6,
-      prefix = icons.ui.Circle,
-      severity = {
-        min = severity,
-      },
-    },
-
-    virtual_lines = {
-      severity = {
-        min = severity,
-      },
-    },
-
-    jump = {
-      wrap = false,
-      severity = {
-        min = severity,
-      },
-    },
-
-    float = {
-      border = "rounded",
-    },
-
-    severity_sort = true,
-
-    signs = {
-      text = {
-        [vim.diagnostic.severity.ERROR] = icons.diagnostics.Error,
-        [vim.diagnostic.severity.HINT] = icons.diagnostics.Hint,
-        [vim.diagnostic.severity.INFO] = icons.diagnostics.Info,
-        [vim.diagnostic.severity.WARN] = icons.diagnostics.Warn,
-      },
-    },
-  }
-end
-
----Select minimum diagnostic severity for which to show virtual text.
-M.select_virtual_text_severity = function()
+---Use `Telescope` to set a new diagnostic severity.
+M.set_severity = function()
   if not pcall(require, "telescope") then
     vim.notify("Telescope not available!", vim.log.levels.ERROR)
     return
   end
 
-  local display_row = require("telescope.pickers.entry_display").create {
+  local displayer = require("telescope.pickers.entry_display").create {
     separator = "",
-    items = { { width = 3 }, { remaining = true } },
+    items = { { width = 3 }, { width = 3 }, { remaining = true } },
   }
 
   local make_display = function(entry)
-    return display_row {
+    local severity = vim.F.npcall(
+      function() return vim.diagnostic.config().signs.severity.min end
+    )
+    local marker = severity == entry.value.severity and icons.ui.Checkbox or ""
+    return displayer {
+      { marker, "Comment" },
       { entry.value.icon, entry.value.highlight },
       { entry.value.title, entry.value.highlight },
     }
@@ -89,6 +51,12 @@ M.select_virtual_text_severity = function()
       prompt_title = "Min. severity for virtual text:",
       finder = require("telescope.finders").new_table {
         results = {
+          {
+            title = "Off",
+            severity = 0,
+            icon = icons.ui.Off,
+            highlight = "Comment",
+          },
           {
             title = "Error",
             severity = vim.diagnostic.severity.ERROR,
@@ -124,7 +92,7 @@ M.select_virtual_text_severity = function()
         actions.select_default:replace(function()
           actions.close(prompt_bufnr)
           local selection = require("telescope.actions.state").get_selected_entry()
-          vim.diagnostic.config(diagnostics_opts(selection.value.severity))
+          M.setup { severity = { min = selection.value.severity } }
         end)
         return true
       end,
@@ -133,6 +101,40 @@ M.select_virtual_text_severity = function()
 end
 
 ---Customize nvim's diagnostics display.
-M.setup = function() vim.diagnostic.config(diagnostics_opts()) end
+M.setup = function(opts)
+  opts = vim.tbl_deep_extend("keep", opts or {}, {
+    severity = {
+      min = vim.diagnostic.severity.HINT,
+    },
+  })
+
+  vim.diagnostic.config {
+    underline = false,
+    severity_sort = true,
+    signs = {
+      severity = opts.severity,
+      text = {
+        [vim.diagnostic.severity.ERROR] = icons.diagnostics.Error,
+        [vim.diagnostic.severity.WARN] = icons.diagnostics.Warn,
+        [vim.diagnostic.severity.INFO] = icons.diagnostics.Info,
+        [vim.diagnostic.severity.HINT] = icons.diagnostics.Hint,
+      },
+    },
+    virtual_text = {
+      severity = opts.severity,
+      prefix = function(_, index, total) return index == total and "▰" or "▱" end,
+    },
+    float = {
+      border = "rounded",
+      header = { " " .. icons.ui.Diagnostic .. "  Diagnostics:", "Comment" },
+      prefix = function(_, index, _) return string.format("%2d. ", index), "Comment" end,
+    },
+    jump = {
+      severity = opts.severity,
+      wrap = false,
+      float = true,
+    },
+  }
+end
 
 return M

config/nvim/lua/fschauen/keymap.lua

@@ -91,10 +91,10 @@ M.setup = function()
   local ui = require("fschauen.util.icons").ui
 
   -- navigate diagnostics
-  map("n", "<leader>dd", diagnostic.toggle,                       { desc = ui.Diagnostic.." [d]iagnostic enable/[d]isable" })
-  map("n", "<leader>do", diagnostic.open_float,                   { desc = ui.Diagnostic.." [d]iagnostic [o]pen" })
-  map("n", "<leader>dh", diagnostic.hide,                         { desc = ui.Diagnostic.." [d]iagnostic [h]ide" })
-  map("n", "<leader>ds", diagnostic.select_virtual_text_severity, { desc = ui.Diagnostic.." [d]iagnostic [s]everity" })
+  map("n", "<leader>dd", diagnostic.toggle,       { desc = ui.Diagnostic.." [d]iagnostic enable/[d]isable" })
+  map("n", "<leader>do", diagnostic.open_float,   { desc = ui.Diagnostic.." [d]iagnostic [o]pen" })
+  map("n", "<leader>dh", diagnostic.hide,         { desc = ui.Diagnostic.." [d]iagnostic [h]ide" })
+  map("n", "<leader>ds", diagnostic.set_severity, { desc = ui.Diagnostic.." [d]iagnostic [s]everity" })
 
   -- toggle quickfix and loclist
   map("n",      "<leader>q", window.toggle_quickfix, { desc = ui.Toggle.." toggle quickfix" })

config/nvim/lua/fschauen/util/icons.lua

@@ -114,6 +114,7 @@ M.ui = {
   Markdown              = "",
   Modified              = "",
   Note                  = "",    -- 
+  Off                   = "",
   Paste                 = "",
   Play                  = "",
   ReadOnly              = "",    -- "RO",