fix: is_registered didn't work. multiple register of the same source added sources multiple times. fixed now

Author: folke

lua/null-ls/builtins/diagnostics.lua

@@ -256,7 +256,7 @@ M.selene = h.make_builtin({
                     end
                 end
             end
-            for _, line in ipairs(vim.split(params.output, "\n")) do
+            for _, line in ipairs(vim.split(params.output or "", "\n")) do
                 if line ~= "" then
                     local ok, diagnostic = pcall(vim.fn.json_decode, line)
                     if ok then

lua/null-ls/builtins/init.lua

@@ -3,4 +3,12 @@ local formatting = require("null-ls.builtins.formatting")
 local code_actions = require("null-ls.builtins.code-actions")
 local test = require("null-ls.builtins.test")
 
-return { diagnostics = diagnostics, formatting = formatting, code_actions = code_actions, _test = test }
+local builtin = { diagnostics = diagnostics, formatting = formatting, code_actions = code_actions, _test = test }
+
+for _, builtins in pairs(builtin) do
+    for name, b in pairs(builtins) do
+        b.name = b.name or name
+    end
+end
+
+return builtin

lua/null-ls/config.lua

@@ -138,6 +138,7 @@ M.is_registered = is_registered
 M.register = register
 M.reset_sources = function()
     config._generators = {}
+    config._names = {}
 end
 
 M.generators = function(method)

lua/null-ls/helpers.lua

@@ -227,6 +227,7 @@ M.make_builtin = function(opts)
         filetypes = filetypes,
         generator = generator,
         _opts = generator_opts or {},
+        name = opts.name,
     }
 
     setmetatable(builtin, {