CODEWITHSUNDEEP
vimstdin
S.V
S.V

Reputation: 2793

vim: How to detect stdin input in .vimrc?

How can one detect stdin input in .vimrc?

I have the following command in my ~/.vimrc:

autocmd BufWinEnter * silent loadview

to open a file with a cursor at the last line position. However, if I use vim on stdin, I get the following error message:

Error detected while processing BufWinEnter Autocommands for "*":
E32: No file name
Press ENTER or type command to continue

How can one detect that vim is used on stdin in .vimrc to suppress execution of the command in such cases?

Thank you for your help!

Upvotes: 1

Views: 404

Answers (1)

romainl
romainl

Reputation: 196556

v:argv is a list that begins with the complete path of the program, and contains each argument, if any.

If you call Vim like this:

$ vim

:echo v:argv outputs something like:

['/path/to/vim']

If you call Vim like this:

$ vim foo.txt bar.json

:echo v:argv outputs something like:

['/path/to/vim', 'foo.txt', 'bar.json']

If you call Vim like this:

$ echo 'foo bar baz' | vim -

:echo v:argv outputs something like:

['/path/to/vim', '-']

Therefore, you can condition the execution of :loadview to the content of v:argv[1]. Note that we use get() because the index 1 may not exist:

autocmd BufWinEnter * if get(v:argv, 1, '') != '-' | silent loadview | endif

Reference:

:help :get()
:help v:argv

Upvotes: 7

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