How to re-evaluate shell environment and re-evaluate frame-title-format before opening each buffer in emacs
Here is complete example of setting frame-title, currently it works only for git repos
(defun my-get-frame-title () "If inside a git repo return a string containing git repo, branch and file state elsereturn default frame title" (let* ((file (buffer-file-name)) (git-directory (when file (locate-dominating-file (file-truename default-directory) ".git")))) (if git-directory (concat (file-name-nondirectory (buffer-file-name)) " on " (vc-working-revision file) " in " (file-name-nondirectory (directory-file-name git-directory)) " current state is " (symbol-name (vc-state file))) (concat invocation-name "@" system-name))))(setq-default frame-title-format '(:eval (my-get-frame-title)))This set the frame title in git repos in the format <filename> on <branch> in <repo> current state is <state> otherwise it falls back to emacs' default frame title