Zsh tab completion duplicating command name

Question

I\'m on OS X Mountain Lion, running the included ZSH shell (4.3.11) with Oh-My-ZSH installed over the top.

When using tab completion with commands such as homebrew, when

Answer 1

A lot of answers in a lot of places suggest the export LC_ALL=en_US.UTF-8 solution. This, however did not work for me. I continued to have this issue using oh-my-zsh on both Arch linux and PopOS.

The only solution that worked for me was this suggestion by romkatv on an issue on the oh-my-zsh github repository.

It turns out, at least in my case, that the autocomplete duplication issue would only show up if there was a non-ASCII character somewhere on the line (like an emoji). And ZSH would incorrectly assume that this non-ASCII character needs to take up 2 character spaces instead of 1.

So the solution that worked was to open up the .zsh-theme file of whatever theme you're using, find all non-ASCII characters and use %{%G%} to tell ZSH to only use one character width for that character

For example, the default oh-my-zsh theme robbyrussel contains 2 non-ASCII characters. The '➜' character in the prompt

PROMPT="%(?:%{$fg_bold[green]%}➜ :%{$fg_bold[red]%}➜ )"

and the '✗' character in the prompt for git directories

ZSH_THEME_GIT_PROMPT_DIRTY="%{$fg[blue]%}) %{$fg[yellow]%}✗"

Using %{%G%} around the 2 non-ASCII characters like this

PROMPT="%(?:%{$fg_bold[green]%}%{%G➜%} :%{$fg_bold[red]%}%{%G➜%} )"

and this

ZSH_THEME_GIT_PROMPT_DIRTY="%{$fg[blue]%}) %{$fg[yellow]%}%{%G✗%}"

is what finally fixed the issue for me.

So all you need to do is make a copy of the theme file you want to use and edit all the non-ASCII characters as shown above and you should hopefully never see the duplication issue again.