enhance: set default diagnostics source to nvim-lsp & coc

doc: update docs for options.

README.md

@@ -106,7 +106,7 @@ Lualine has sections as shown below.
 
 Each sections holds it's components e.g. current vim's mode.
 
-<details><summary>Configuring from `.vim` file</summary>
+<details><summary>Configuring lualine in init.vim</summary>
 
 All the examples below are in lua. You can use the same examples
 in `.vim` file by wrapping them in lua heredoc like this:
@@ -332,26 +332,40 @@ shown . On the other hand branch will be formatted with global formatter
 <details>
 <summary><b>Global options</b></summary>
 
+These are `options` that are used in options table.
+They set behavior of lualine.
+
+Values set here are treated as default for other options
+that work in component level.
+
+for example even though `icons_enabled` is a general component option.
+you can set `icons_enabled` to `false` and icons will be disabled on all
+component. You can still overwrite defaults set in option table by specifying
+the option value in component.
+
 ```lua
 options = {
-  icons_enabled = true, -- displays icons in alongside component
-  padding = 1, -- adds padding to the left and right of components
-               -- padding can be specified to left or right separately like
-               -- padding = { left = left_padding, right = right_padding }
-  fmt = nil -- fmt function, formats component's output
+  theme = 'auto',          -- lualine theme
+  component_separators = {left = '', right = ''},
+  section_separators = {left = '', right = ''},
+  disabled_filetypes = {},  -- filetypes to diable lualine on
 }
 ```
 
 </details>
 
 <details>
-<summary><b>Local options</b></summary>
+<summary><b>General component options</b></summary>
+
+These are options that control behavior at component level
+and are available for all components.
 
 ```lua
 sections = {
   lualine_a = {
     {
       'mode',
+      icons_enabled = true, -- displays icons in alongside component
       icon = nil,      -- displays icon in front of the component
       separator = nil, -- Determines what separator to use for the component.
                        -- when a string is given it's treated as component_separator.
@@ -375,6 +389,10 @@ sections = {
       -- luae(lua expressions), vimf(viml function name)
       -- luae is short for lua-expression and vimf is short fror vim-function
       type = nil,
+      padding = 1, -- adds padding to the left and right of components
+                   -- padding can be specified to left or right separately like
+                   -- padding = { left = left_padding, right = right_padding }
+      fmt = nil,   -- format function, formats component's output
     }
   }
 }
@@ -383,7 +401,11 @@ sections = {
 </details>
 
 <details>
-<summary><b>Component specific local options</b></summary>
+<summary><b>Component specific options</b></summary>
+
+These are options that are available on specific components.
+For example you have option on `diagnostics` component to
+specify what your diagnostic sources will be.
 
 #### buffers component options
 
@@ -422,7 +444,7 @@ sections = {
       -- 'nvim_lsp', 'nvim', '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 = {},
+      sources = {'nvim_lsp', 'coc'},
       -- displays diagnostics from defined severity
       sections = {'error', 'warn', 'info', 'hint'},
       -- all colors are in format #rrggbb

doc/lualine.txt

@@ -82,7 +82,7 @@ Lualine has sections as shown below.
 
 Each sections holds it’s components e.g. current vim’s mode.
 
-Configuring from `.vim` file
+Configuring lualine in init.vim
 
 All the examples below are in lua. You can use the same examples in `.vim` file
 by wrapping them in lua heredoc like this:
@@ -313,24 +313,40 @@ shown. On the other hand branch will be formatted with global formatter
 
 Global options ~
 
+Available options                      These are `options` that are used in
+                                       options table. They set behavior of
+                                       lualine.
+
+
+Values set here are treated as default for other options that work in component
+level.
+
+for example even though `icons_enabled` is a general component option. you can
+set `icons_enabled` to `false` and icons will be disabled on all component. You
+can still overwrite defaults set in option table by specifying the option value
+in component.
+
 >
     options = {
-      icons_enabled = true, -- displays icons in alongside component
-      padding = 1, -- adds padding to the left and right of components
-                   -- padding can be specified to left or right separately like
-                   -- padding = { left = left_padding, right = right_padding }
-      fmt = nil -- fmt function, formats component's output
+      theme = 'auto',          -- lualine theme
+      component_separators = {left = '', right = ''},
+      section_separators = {left = '', right = ''},
+      disabled_filetypes = {},  -- filetypes to diable lualine on
     }
 <
 
 
-Local options ~
+General component options ~
+
+These are options that control behavior at component level and are available
+for all components.
 
 >
     sections = {
       lualine_a = {
         {
           'mode',
+          icons_enabled = true, -- displays icons in alongside component
           icon = nil,      -- displays icon in front of the component
           separator = nil, -- Determines what separator to use for the component.
                            -- when a string is given it's treated as component_separator.
@@ -354,13 +370,21 @@ Local options ~
           -- luae(lua expressions), vimf(viml function name)
           -- luae is short for lua-expression and vimf is short fror vim-function
           type = nil,
+          padding = 1, -- adds padding to the left and right of components
+                       -- padding can be specified to left or right separately like
+                       -- padding = { left = left_padding, right = right_padding }
+          fmt = nil,   -- format function, formats component's output
         }
       }
     }
 <
 
 
-Component specific local options ~
+Component specific options ~
+
+These are options that are available on specific components. For example you
+have option on `diagnostics` component to specify what your diagnostic sources
+will be.
 
                                            *lualine-buffers-component-options*
 
@@ -400,7 +424,7 @@ Component specific local options ~
           -- 'nvim_lsp', 'nvim', '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 = {},
+          sources = {'nvim_lsp', 'coc'},
           -- displays diagnostics from defined severity
           sections = {'error', 'warn', 'info', 'hint'},
           -- all colors are in format #rrggbb

lua/lualine/components/buffers.lua

@@ -14,6 +14,10 @@ local default_options = {
     fzf = 'FZF',
     alpha = 'Alpha',
   },
+  buffers_color = {
+    active = nil,
+    inactive = nil,
+  },
 }
 
 local function get_hl(section, is_active)
@@ -42,13 +46,11 @@ end
 
 function Buffer:get_props()
   self.file = vim.fn.bufname(self.bufnr)
-  self.filepath = vim.fn.expand('#' .. self.bufnr .. ':p:~')
   self.buftype = vim.api.nvim_buf_get_option(self.bufnr, 'buftype')
   self.filetype = vim.api.nvim_buf_get_option(self.bufnr, 'filetype')
   local modified = self.options.show_modified_status and vim.api.nvim_buf_get_option(self.bufnr, 'modified')
   local modified_icon = self.options.icons_enabled and ' ' or ' +'
   self.modified_icon = modified and modified_icon or ''
-  self.visible = vim.fn.bufwinid(self.bufnr) ~= -1
   self.icon = ''
   if self.options.icons_enabled then
     local dev

lua/lualine/components/diagnostics.lua

@@ -49,7 +49,7 @@ local default_symbols = {
 local default_options = {
   colored = true,
   update_in_insert = false,
-  sources = nil,
+  sources = { 'nvim_lsp', 'coc' },
   sections = { 'error', 'warn', 'info', 'hint' },
   diagnostics_color = {
     error = {
@@ -122,7 +122,7 @@ Diagnostics.new = function(self, options, child)
   end
 
   -- Error out no source
-  if new_diagnostics.options.sources == nil then
+  if #new_diagnostics.options.sources < 1 then
     print 'no sources for diagnostics configured'
     return ''
   end

lua/lualine/components/tabs.lua

@@ -6,6 +6,10 @@ local highlight = require 'lualine.highlight'
 local default_options = {
   max_length = 0,
   mode = 0,
+  tabs_color = {
+    active = nil,
+    inactive = nil,
+  },
 }
 
 local function get_hl(section, is_active)