CODEWITHSUNDEEP
vim
Sarvesh M.D
Sarvesh M.D

Reputation: 360

How to `==` to a newline character in vim

I want to match newline character in test case of an if statement in vim script.

How do I match to a newline character ?
The reason for this is, when I want to get the output of a system command and check if it matches something, and then execute a command, the system() command in vim can do the work, but it returns with a newline at the end. So I am not able to match properly.

For example, I hope you know about git rev-parse --is-inside-work-tree, it prints true with a newline at the end if we are inside a git repository, and false with a newline at the end if we are not inside a git repository.

I want to use this command inside vim script and run a command only if I am inside a git repository.
But since this command returns true or false with a newline at the end, I am unable to use the following snippet of code to do this. Because system("git rev-parse --is-inside-work-tree") returns true or false with a newline at the end.

if system("git rev-parse --is-inside-work-tree") == 'true'
  echo "Inside a git repository"
else 
  echo "Not inside a git repository"
endif

What can I use instead of if system("git rev-parse --is-inside-work-tree") == 'true' to match newline at the end ?

Upvotes: 1

Views: 250

Answers (2)

leaf
leaf

Reputation: 1764

You can use "true\n" to check the newline. Note that double quotes are used for special characters. See :h string

echo system('git rev-parse --is-inside-work-tree') == "true\n"
" 1

Upvotes: 1

romainl
romainl

Reputation: 196751

You can remove the newline with a substitution:

system("git rev-parse --is-inside-work-tree")->substitute('\n','','') == 'true'

or compare against a regular expression:

system("git rev-parse --is-inside-work-tree") =~ 'true'

or get a list from the external command, with a single item because there is only one actual line in the output:

systemlist("git rev-parse --is-inside-work-tree")[0] == 'true'

See :help substitute(), help expr-=~, and :help systemlist().

Upvotes: 1

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