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I am using zsh with oh-my-zsh. Unfortunately, oh-my-zsh does not use file ~/.ssh/config for hostname auto-completion (see Issue #1009, for instance).

This could easily archived by the following code:

[ -r ~/.ssh/config ] && _ssh_config=($(cat ~/.ssh/config | sed -ne 's/Host[=\t ]//p')) || _ssh_config=()
zstyle ':completion:*:hosts' hosts $_ssh_config

However, if I add the above commands to my ~/.zshrc file, all other sources for hostnames (like ~/.ssh/known_hosts), which are defined in file ~/.oh-my-zsh/lib/completion.zsh, are overridden.

How can I append new completion rules for ':completion:*:hosts' in my ~/.zshrc file?

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3 Answers 3

up vote 0 down vote accepted

I think you need to retrieve the existing items and append yours.

zstyle -s ':completion:*:hosts' hosts _ssh_config
[[ -r ~/.ssh/config ]] && _ssh_config+=($(cat ~/.ssh/config | sed -ne 's/Host[=\t ]//p'))
zstyle ':completion:*:hosts' hosts $_ssh_config
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Thanks, zstyle -s was the missing piece. –  Martin Oct 18 '12 at 5:08

The best option appears be to just use zsh's defaults.

See my pull request for oh-my-zsh at https://github.com/robbyrussell/oh-my-zsh/pull/1498

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You may want to replace oh-my-zsh with the much-better written and maintained https://github.com/sorin-ionescu/prezto which uses default zsh completions and this external module https://github.com/zsh-users/zsh-completions

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