Zsh tab completion duplicating command name

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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 ZSH lists the available commands, it is also duplicating the command. For example:

$ brew {tab}

will result in:

$ brew brew 
[list of homebrew commands]

I'm unsure what is causing this error, as when I resize the terminal window, the first instance of the command name disappears.

If I hit backspace when the duplicates are displayed, I can only delete the second instance of the command, zsh won't let me backspace any further. Also, if I do remove the duplicate with backspace, zsh then acts as if there is no command typed at all.

My .zshrc along with all my other .configuration files can be found at https://github.com/daviesjamie/dotfiles

UPDATE: I found this post about someone having the same problem on Ubuntu. However, I don't understand the given solution, and I'm not even sure if it applies to my set up?

zsh-completion tab-completion zsh macos
6 Answers

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<character>%} 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.

user_70536180
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