From ef9faefa65b63832779a416321e1c2ece16523a6 Mon Sep 17 00:00:00 2001
From: Mat Jones <mat@mjones.network>
Date: Thu, 10 Aug 2023 08:37:54 -0400
Subject: [PATCH] feat(nvim): Do not update LSP format statusline component for
 markdown previews

---
 nvim/lua/my/configure/heirline/statusline.lua |  6 ++++--
 nvim/lua/my/lsp/utils/init.lua                | 16 +++++++++++-----
 2 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/nvim/lua/my/configure/heirline/statusline.lua b/nvim/lua/my/configure/heirline/statusline.lua
index dc3e2e0c..c08818b1 100644
--- a/nvim/lua/my/configure/heirline/statusline.lua
+++ b/nvim/lua/my/configure/heirline/statusline.lua
@@ -200,7 +200,8 @@ M.OnePassword = {
 
 M.LspFormatToggle = {
   provider = function()
-    if require('my.lsp.utils').is_formatting_supported() then
+    local buf = vim.b.mdpreview_session and vim.b.mdpreview_session.source_buf or 0 ---@diagnostic disable-line
+    if require('my.lsp.utils').is_formatting_supported(buf) then
       return '   '
     else
       return '   '
@@ -219,7 +220,8 @@ M.LspFormatToggle = {
   },
   {
     provider = function()
-      local name = require('my.lsp.utils').get_formatter_name()
+      local buf = vim.b.mdpreview_session and vim.b.mdpreview_session.source_buf or 0 ---@diagnostic disable-line
+      local name = require('my.lsp.utils').get_formatter_name(buf)
       if name then
         return string.format(' (%s)  ', name)
       end
diff --git a/nvim/lua/my/lsp/utils/init.lua b/nvim/lua/my/lsp/utils/init.lua
index 59279d8b..a70bd21f 100644
--- a/nvim/lua/my/lsp/utils/init.lua
+++ b/nvim/lua/my/lsp/utils/init.lua
@@ -112,12 +112,15 @@ function M.toggle_formatting_enabled(enable)
   end
 end
 
-function M.get_formatter_name()
-  local clients = vim.lsp.get_active_clients({ bufnr = vim.api.nvim_get_current_buf() })
+---@param buf number|nil defaults to 0 (current buffer)
+---@return string|nil
+function M.get_formatter_name(buf)
+  buf = buf or tonumber(vim.g.actual_curbuf or vim.api.nvim_get_current_buf())
+  local clients = vim.lsp.get_active_clients({ bufnr = buf })
   for _, client in ipairs(clients) do
     if client.supports_method('textDocument/formatting') then
       if client.name == 'efm' then
-        local ft_config = require('my.lsp.filetypes').config[vim.bo[tonumber(vim.g.actual_curbuf or 0)].filetype]
+        local ft_config = require('my.lsp.filetypes').config[vim.bo[buf].filetype]
         if ft_config then
           if type(ft_config.formatter) == 'table' then
             return ft_config.formatter[1]
@@ -133,12 +136,15 @@ function M.get_formatter_name()
   return nil
 end
 
-function M.is_formatting_supported()
+---@param buf number|nil defaults to 0 (current buffer)
+---@return boolean
+function M.is_formatting_supported(buf)
+  buf = buf or vim.api.nvim_get_current_buf()
   if not formatting_enabled then
     return false
   end
 
-  local clients = vim.lsp.get_active_clients({ bufnr = vim.api.nvim_get_current_buf() })
+  local clients = vim.lsp.get_active_clients({ bufnr = buf })
   for _, client in ipairs(clients) do
     if client.supports_method('textDocument/formatting') then
       return true