nvim: fix opening browser with Markdown preview on macOS + Firefox + tmux

config/nvim/lua/fschauen/plugins/markdown-preview.lua

@@ -21,5 +21,17 @@ return {
 
     -- Show preview page URL in command line when opening preview page.
     vim.g.mkdp_echo_preview_url = 1
+
+    -- Workaround for combination of macOS + Firefox + tmux:
+    -- *  On macOS, this plugin uses the open(1) command to open the preview
+    --    page in a browser.
+    -- *  For some reason, Firefox cannot be opened with open(1) from within
+    --    tmux (tested on macOS 14.5).
+    -- *  The workaround is therefore to fall back to Safari.
+    -- *  Run `open -a firefox https://schauenburg.me` from within a tmux
+    --    session -> if it works, this workaround is no longer needed.
+    if vim.fn.has("mac") and vim.env.TMUX then
+      vim.g.mkdp_browser = "safari"
+    end
   end,
 }