Adding the code

lua/lualine/components/lsp-status.lua

@@ -0,0 +1,104 @@
+local M = require('lualine.component'):extend()
+local utils = require('lualine.utils.utils')
+
+local default_options = {
+
+    -- true if the number of lsp clients connected should be shown.
+    show_count = true,
+
+    -- true if icon should also be color coded.
+    colored = true,
+
+    -- Colors used.
+    colors = {
+        -- Color used if there are one or more clients connected
+        active = {
+            fg = utils.extract_color_from_hllist(
+                'fg',
+                { 'DiagnosticOk', 'DiagnosticSignOk' },
+                '#89dceb'
+            )
+        },
+        -- Color used if there is zero clients connected
+        inactive = {
+            fg = utils.extract_color_from_hllist(
+                'fg',
+                { 'DiagnosticError', 'DiagnosticSignError', 'Error' },
+                '#f38ba8'
+            )
+        },
+        -- Color used for the count.
+        count = {
+            fg = utils.extract_color_from_hllist(
+                'fg',
+                { 'StatusLineNormal' },
+                '#ffffff'
+            )
+        },
+    },
+
+    -- Icon used.
+    icons = {
+        -- Icon used when there is one or more clients connected
+        active = "",
+
+        -- Icon used when there is zero clients connected.
+        inactive = ""
+    }
+}
+
+
+function M:init(options)
+    options = vim.tbl_deep_extend('keep', options or {}, default_options)
+    M.super.init(self, options)
+
+    if self.options.colored then
+        self.highlights = {
+            active = self:create_hl(self.options.colors.active, 'active'),
+            inactive = self:create_hl(self.options.colors.inactive, 'inactive'),
+            count = self:create_hl(self.options.colors.count, 'count'),
+        }
+        self.hl = {}
+        for name, highlight_name in pairs(self.highlights) do
+            self.hl[name] = self:format_hl(highlight_name)
+        end
+    end
+end
+
+function M:format(icon, count)
+    if self.config.show_count then
+        return string.format("%s %s", icon, count)
+    end
+    return string.format("%s", icon)
+end
+
+function M:update_status()
+
+    local num_clients = #vim.tbl_keys(vim.lsp.get_clients())
+
+    local status = "inactive"
+    if num_clients > 0 then
+        status = "active"
+    end
+
+    local segments = {}
+
+    local icon = self.options.icons[status]
+    if self.options.colored then
+        table.insert(segments, self.hl[status] .. icon)
+    else
+        table.insert(segments, icon)
+    end
+
+    if self.options.show_count then
+        if self.options.colored then
+            table.insert(segments, self.hl["count"] .. num_clients)
+        else
+            table.insert(segments, num_clients)
+        end
+    end
+
+    return table.concat(segments, ' ')
+end
+
+return M