CODEWITHSUNDEEP
vimbuffer
alfredodeza
alfredodeza

Reputation: 5188

Read the contents of a modified buffer in Vim

How can I access the contents of a modified buffer in Vim?

For example, if I want to concatenate the contents to a temporary file, like:

:! cat % > /tmp/modified.txt

But that gives me the last saved contents of the file (rightly so?). I do want to avoid saving the file before because this interaction is meant to allow some analysis without saving the buffer first.

It seems that the Python extension for Vim allows you to do something like:

def buffer_contents(buffer=vim.current.buffer):
    contents = buffer[:]

But I can't find any VimL references for the same functionality.

EDIT: It seems I could do something like:

:let buffer_contents = join(getline(1, '$'), '$')

At this point I just wonder if there is a builtin approach.

Upvotes: 0

Views: 705

Answers (2)

Ingo Karkat
Ingo Karkat

Reputation: 172540

Though you can use getline(1, $) to retrieve all (modified) lines in the buffer, when your goal is writing them to a file, the :w! > filename as per ZyX's answer is still the way to go. Though there is a writefile() function in Vimscript, you'd have to deal with encodings, line endings, etc. all on your own, and that's simply too cumbersome when the built-in :write can do it for you.

Upvotes: 1

ZyX
ZyX

Reputation: 53604

If you want to append current contents to temporary file you can use

:w! >> /tmp/modified.txt

,

:w! > /tmp/modified.txt

for overwriting that file (like in your cat example). To pass it to stdin of some script

:w !some-script

. Wondering though what’s wrong with your getline(1, '$')?

Upvotes: 2

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