Question 112422 in Ubuntu Question posted in
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Ubuntu – Set if &cp | set noocp | endif in the ~/.vimrc file

Ubuntu 16.04.6 LTS
Vim 7.4

Setting in ~/.vimrc file

if &cp | set noocp | endif

I’m curious about the function of the phrase
What is &cp and what function is |?
I’m also curious about the function of if…endif

Sorry, I’m a beginner If you give me an answer, it will help me a lot

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2

Answers


  1. 0

    &cp — value of Vim option cp (:h 41.3, :h 'cp'), | — another command in same command line (:h :bar), if ... endif — conditional expression (:h :if).

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  2. 0

    First, let’s fix that nagging typo:

    if &cp | set nocp | endif

    Now we can talk…

    The whole thing is a conditional:

    if <expression that evaluates to 1 ("true")>
  <do something>
endif

    See :help 41.4.

    If you want to save space, you can put a sequence of commands on a single line, separated with |:

    if <expression that evaluates to 1> | <do something> | endif

    See :help :bar.

    &cp, or &compatible, is an expression that evaluates to 1 (true in vimscript) if the compatible option is set and 0 (false) if it is disabled:

    if &cp | <do something> | endif

    See :help 'compatible' and :help expr-option

    The statement between the :if and the :else is set nocp, which unsets compatible:

    if &cp | set nocp | endif

    So, that line tells Vim to check if compatible is set and, if yes, to unset it.

    FWIW, compatible is automatically unset when Vim encounters a vimrc at an expected location so &cp is always going to be evaluated to 0 in your ~/.vimrc, which, basically, makes that line useless outside of very specific use cases that you shouldn’t encounter if you have to ask that question.

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