Re: Bug report: `setopt noaliases` not respected in `local` statement without assignment.

[Daniel Shahaf <d.s@daniel.shahaf.name>]

Roman Perepelitsa wrote on Sun, 29 Mar 2020 12:24 +0200:
> On Thu, Mar 26, 2020 at 11:34 PM Daniel Shahaf <d.s@daniel.shahaf.name> wrote:
> >
> > There are a few other options to worry about, e.g., KSH_ARRAYS,
> > IGNORE_CLOES_BRACES.  
> 
> Good point.
> 
> I also should've mentioned that `emulate zsh -o no_aliases -c "..."`
> shouldn't be used if some of the functions you define must run with
> user-defined options. E.g., if you want to respect user's
> dot_glob/no_dot_glob (fzf does) or
> interactive_comments/no_interactive_comments (f-sy-h does), then this
> approach is out.

z-sy-h handles this by saving ${options} to an associative array before
resetting the options so it can execute:

    86	  # Before we 'emulate -L', save the user's options
    87	  local -A zsyh_user_options
    88	  if zmodload -e zsh/parameter; then
    89	    zsyh_user_options=("${(kv)options[@]}")
    90	  else
    91	    local canonical_options onoff option raw_options
    92	    raw_options=(${(f)"$(emulate -R zsh; set -o)"})
    93	    canonical_options=(${${${(M)raw_options:#*off}%% *}#no} ${${(M)raw_options:#*on}%% *})
    94	    for option in "${canonical_options[@]}"; do
    95	      [[ -o $option ]]
    96	      # This variable cannot be eliminated c.f. workers/42101.
    97	      onoff=${${=:-off on}[2-$?]}
    98	      zsyh_user_options+=($option $onoff)
    99	    done
   100	  fi
   101	  typeset -r zsyh_user_options
   102	
   103	  emulate -L zsh

(I'll fix lines 95-98 in a minute, though.)

Cheers,

Daniel

> Here's another option that doesn't require one to create a new file:
> 
>   () { 'emulate' '-L' 'zsh' '-o' 'no_aliases' && 'eval' "$(<<\END
> 
>   # original file content goes here
> 
>   END
>   )"; }
> 
> Downsides:
> 
>   - one fork (increases loading time)
>   - breaks syntax highlighting in code editors
>   - zcompile won't be effective at speeding up loading time
>   - some aliases can still break this; for example: alias -g '()'=nope