fix: lsp.diagnostics deprecation warning

- change default diagnostics source from nvim_lsp to nvim_diagnostic
  and deprecate nvim_lsp on neovim-0.6 and higher.
- rename diagnostics source nvim to nvim_diagnostic. nvim could be
  confusing.

fixes #473

README.md

@@ -126,8 +126,7 @@ require'lualine'.setup {
   },
   sections = {
     lualine_a = {'mode'},
-    lualine_b = {'branch', 'diff',
-                  {'diagnostics', sources={'nvim_lsp', 'coc'}}},
+    lualine_b = {'branch', 'diff', 'diagnostics'},
     lualine_c = {'filename'},
     lualine_x = {'encoding', 'fileformat', 'filetype'},
     lualine_y = {'progress'},
@@ -433,18 +432,18 @@ sections = {
     {
       'diagnostics',
       -- table of diagnostic sources, available sources:
-      -- 'nvim_lsp', 'nvim', 'coc', 'ale', 'vim_lsp'
+      -- 'nvim_lsp', 'nvim_diagnostic', 'coc', 'ale', 'vim_lsp'
       -- Or a function that returns a table like
       --   {error=error_cnt, warn=warn_cnt, info=info_cnt, hint=hint_cnt}
-      sources = {'nvim_lsp', 'coc'},
+      sources = {'nvim_diagnostic', 'coc'},
       -- displays diagnostics from defined severity
       sections = {'error', 'warn', 'info', 'hint'},
       diagnostics_color = {
         -- Same values like general color option can be used here.
         error = 'DiagnosticError', -- changes diagnostic's error color
         warn  = 'DiagnosticWarn',  -- changes diagnostic's warn color
-        info  = 'DiagnosticInfo',  -- Changes diagnostic's info color
-        hint  = 'DiagnosticHint',  -- Changes diagnostic's hint color
+        info  = 'DiagnosticInfo',  -- changes diagnostic's info color
+        hint  = 'DiagnosticHint',  -- changes diagnostic's hint color
       },
       symbols = {error = 'E', warn = 'W', info = 'I', hint = 'H'},
       colored = true, -- displays diagnostics status in color if set to true

doc/lualine.txt

@@ -113,8 +113,7 @@ checkout `:help lua-heredoc`.
       },
       sections = {
         lualine_a = {'mode'},
-        lualine_b = {'branch', 'diff',
-                      {'diagnostics', sources={'nvim_lsp', 'coc'}}},
+        lualine_b = {'branch', 'diff', 'diagnostics'},
         lualine_c = {'filename'},
         lualine_x = {'encoding', 'fileformat', 'filetype'},
         lualine_y = {'progress'},
@@ -457,18 +456,18 @@ Component specific options             These are options that are available on
         {
           'diagnostics',
           -- table of diagnostic sources, available sources:
-          -- 'nvim_lsp', 'nvim', 'coc', 'ale', 'vim_lsp'
+          -- 'nvim_lsp', 'nvim_diagnostic', 'coc', 'ale', 'vim_lsp'
           -- Or a function that returns a table like
           --   {error=error_cnt, warn=warn_cnt, info=info_cnt, hint=hint_cnt}
-          sources = {'nvim_lsp', 'coc'},
+          sources = {'nvim_diagnostic', 'coc'},
           -- displays diagnostics from defined severity
           sections = {'error', 'warn', 'info', 'hint'},
           diagnostics_color = {
             -- Same values like general color option can be used here.
             error = 'DiagnosticError', -- changes diagnostic's error color
             warn  = 'DiagnosticWarn',  -- changes diagnostic's warn color
-            info  = 'DiagnosticInfo',  -- Changes diagnostic's info color
-            hint  = 'DiagnosticHint',  -- Changes diagnostic's hint color
+            info  = 'DiagnosticInfo',  -- changes diagnostic's info color
+            hint  = 'DiagnosticHint',  -- changes diagnostic's hint color
           },
           symbols = {error = 'E', warn = 'W', info = 'I', hint = 'H'},
           colored = true, -- displays diagnostics status in color if set to true

lua/lualine/components/diagnostics/config.lua

@@ -18,7 +18,7 @@ M.options = {
   colored = true,
   update_in_insert = false,
   always_visible = false,
-  sources = { 'nvim_lsp', 'coc' },
+  sources = { vim.fn.has 'nvim-0.6' == 1 and 'nvim_diagnostic' or 'nvim_lsp', 'coc' },
   sections = { 'error', 'warn', 'info', 'hint' },
   diagnostics_color = {
     error = {

lua/lualine/components/diagnostics/init.lua

@@ -58,6 +58,43 @@ function M:init(options)
     print 'no sources for diagnostics configured'
     return ''
   end
+  if vim.fn.has 'nvim-0.6' then
+    for i, name in ipairs(self.options.sources) do
+      if name == 'nvim_lsp' then
+        self.options.sources[i] = 'nvim_diagnostic'
+        modules.utils_notices.add_notice [[
+### diagnostics.source
+Diagnostics source `nvim_lsp` has been deprecated in favour of `nvim_diagnostic`.
+nvim_diagnostic shows diagnostics from neovim's diagnostics api
+while nvim_lsp used to only show lsp diagnostics.
+
+You've something like this your config.
+```lua
+  {'diagnostics', sources = {'nvim_lsp'}}
+```
+It needs to be updated to:
+```lua
+  {'diagnostics', sources = {'nvim_diagnostic'}}
+```
+]]
+      elseif name == 'nvim' then
+        self.options.sources[i] = 'nvim_diagnostic'
+        modules.utils_notices.add_notice [[
+### diagnostics.source
+Diagnostics source `nvim` has been renamed to `nvim_diagnostic`
+
+You've something like this your config.
+```lua
+  {'diagnostics', sources = {'nvim'}}
+```
+It needs to be updated to:
+```lua
+  {'diagnostics', sources = {'nvim_diagnostic'}}
+```
+]]
+      end
+    end
+  end
   -- Initialize variable to store last update so we can use it in insert
   -- mode for no update_in_insert
   self.last_diagnostics_count = {}

lua/lualine/components/diagnostics/sources.lua

@@ -11,7 +11,7 @@ M.sources = {
     local hint_count = vim.lsp.diagnostic.get_count(0, 'Hint')
     return error_count, warning_count, info_count, hint_count
   end,
-  nvim = function()
+  nvim_diagnostic = function()
     local diagnostics = vim.diagnostic.get(0)
     local count = { 0, 0, 0, 0 }
     for _, diagnostic in ipairs(diagnostics) do

lua/lualine/config.lua

@@ -13,7 +13,7 @@ local config = {
   },
   sections = {
     lualine_a = { 'mode' },
-    lualine_b = { 'branch', 'diff', { 'diagnostics', sources = { 'nvim_lsp', 'coc' } } },
+    lualine_b = { 'branch', 'diff', 'diagnostics' },
     lualine_c = { 'filename' },
     lualine_x = { 'encoding', 'fileformat', 'filetype' },
     lualine_y = { 'progress' },

lua/tests/spec/config_spec.lua

@@ -115,7 +115,7 @@ describe('config parsing', function()
       config = config_module.apply_configuration(config)
       local lualine_default_sections = {
         lualine_a = { 'mode' },
-        lualine_b = { 'branch', 'diff', { 'diagnostics', sources = { 'nvim_lsp', 'coc' } } },
+        lualine_b = { 'branch', 'diff', 'diagnostics' },
         lualine_c = { 'filename' },
         lualine_x = { 'encoding', 'fileformat', 'filetype' },
         lualine_y = { 'progress' },