Cannot use ALE in MacVim when the file is opened via the right-click context menu or the File > Open dialog in MacVim about ale HOT 1 OPEN

I solved this issue. It's not a bug with ALE but rather a configuration issue with Vim. I'm documenting the solution so that it may help others who are facing a similar issue.

The solution is to add the -i flag to the default -c flag in the shellcmdflag option in your .vimrc, like this: set shellcmdflag=-ci.

Brief Explanation: By default, Vim runs shell commands using a non-interactive shell, which does not source your .zshrc file (maybe because using an interactive shell can be risky when running untrusted scripts). In Zsh, the interactive option is -i, and adding this flag to the shellcmdflag option tells Zsh to run in interactive mode when executing shell commands.

There may be a better way to do this.

from ale.