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I'd like a tcsh'ism that I haven't been able to find: On a blank line with no content, I want to press the tab key and see the equivalent of an ls. That is to say I want

$ <tab>

to do something other then giving me a \t. I've found fantastic resources for command completion, but not for this base case. Any help on this would be great! Thanks.

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migrated from Jun 2 '11 at 11:52

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2 Answers 2

up vote 6 down vote accepted
# expand-or-complete-or-list-files
function expand-or-complete-or-list-files() {
    if [[ $#BUFFER == 0 ]]; then
        BUFFER="ls "
        zle list-choices
        zle backward-kill-word
        zle expand-or-complete
zle -N expand-or-complete-or-list-files
# bind to tab
bindkey '^I' expand-or-complete-or-list-files
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Very neat. Would it be possible to somehow hide the listing again? Tab-to-show then tab-to-hide would be nice. –  Parker Coates Mar 3 at 14:56
Thanks John, I found your solution and adapted here… –  lolesque Mar 17 at 16:25

The behavior of Tab at the beginning of a line is controlled by the insert-tab style. However, there are only two supported behaviors:

  • completion as usual, under zstyle ':completion:*' insert-tab false
  • insert a tab, under zstyle ':completion:*' insert-tab true
  • either one or the other under zstyle ':completion:*' insert-tab pending[=N]

If you just want to complete commands in that position, zstyle ':completion:*' insert-tab true will do. If you want something different, like listing the files in the current directory, you'll need to modify _main_complete.

A recent thread on the zsh-workers list discussed insert-tab.

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fantastic! By _main_complete it looks like you are referencing somewhere in the C code? I'm sorry for the dumb question, but where would that be found? –  user535759 May 31 '11 at 22:09
@user535759: No, _main_complete is part of the zsh code that implements completion. It's in Completion/Base/Core/_main_complete in the source tree, typically installed in a location like /usr/share/zsh/functions/Completion/Base/_main_complete. –  Gilles May 31 '11 at 22:12

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