feat: lsp diagnostics and prefiltering by entry attribute (#543)

prefiltering for lsp_document_symbols and lsp_workspace_symbols.
example: type `:var:` to show all vars

lua/telescope/utils.lua

@@ -82,6 +82,41 @@ utils.quickfix_items_to_entries = function(locations)
   return results
 end
 
+utils.diagnostics_to_tbl = function(opts)
+  opts = opts or {}
+
+  local bufnr = vim.api.nvim_get_current_buf()
+  local filename = vim.api.nvim_buf_get_name(bufnr)
+  local buffer_diags = vim.lsp.diagnostic.get(bufnr, opts.client_id)
+
+  local items = {}
+  local lsp_type_diagnostic = {[1] = "Error", [2] = "Warning", [3] = "Information", [4] = "Hint"}
+  local insert_diag = function(diag)
+    local start = diag.range['start']
+    local finish = diag.range['end']
+    local row = start.line
+    local col = start.character
+
+    local line = (vim.api.nvim_buf_get_lines(bufnr, row, row + 1, false) or {""})[1]
+
+    table.insert(items, {
+      bufnr = bufnr,
+      filename = filename,
+      lnum = row + 1,
+      col = col + 1,
+      start = start,
+      finish = finish,
+      text = vim.trim(line .. " | " .. diag.message),
+      type = lsp_type_diagnostic[diag.severity] or lsp_type_diagnostic[1]
+    })
+  end
+
+  for _, diag in ipairs(buffer_diags) do insert_diag(diag) end
+
+  table.sort(items, function(a, b) return a.lnum < b.lnum end)
+  return items
+end
+
 -- TODO: Figure out how to do this... could include in plenary :)
 -- NOTE: Don't use this yet. It will segfault sometimes.
 --