fix(markdown): conditionally open preview browser

lua/custom/plugins/markdown.lua

@@ -15,10 +15,28 @@ return {
       vim.fn['mkdp#util#install']()
     end,
     init = function()
+      local browser = ''
+      local is_macos = vim.fn.has('macunix') == 1
+
+      if is_macos then
+        vim.cmd([[
+          function! OpenMarkdownPreview(url) abort
+            execute 'silent !open ' . shellescape(a:url)
+          endfunction
+        ]])
+      elseif vim.fn.executable('google-chrome-stable') == 1 then
+        browser = 'google-chrome-stable'
+      elseif vim.fn.executable('google-chrome') == 1 then
+        browser = 'google-chrome'
+      elseif vim.fn.executable('chromium') == 1 then
+        browser = 'chromium'
+      end
+
       vim.g.mkdp_auto_start = 0
       vim.g.mkdp_auto_close = 1
       vim.g.mkdp_refresh_slow = 0
-      vim.g.mkdp_browser = 'google-chrome-stable'
+      vim.g.mkdp_browser = browser
+      vim.g.mkdp_browserfunc = is_macos and 'OpenMarkdownPreview' or ''
       vim.g.mkdp_filetypes = { 'markdown' }
     end,
     keys = {