Re: readfile() and writefile() in practice

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On October 8, 2014 8:45:03 PM GMT+03:00, Christian Brabandt <cblists@256bit.org> wrote:
>Hi Ben!
>
>On Mi, 08 Okt 2014, Ben Klein wrote:
>
>> Thanks all!
>>
>> Sorry -- I normally would include an example but I sent that email
>from my
>> phone and have unreliable access to my computer (where I've been
>playing
>> with this). I am on a Mac, for what it's worth (not yet using Vim on
>the
>> iPhone :D ).
>>
>> What I've tried to do is to combine a file with the contents of a
>buffer
>> and writefile() that. So here is the file test.txt:
>>
>> ---
>> Tis is
>> text this is
>> ---
>>
>> And this code:
>>
>> ---
>> let dir = "test"
>>
>> function! Append()
>> let contents = readfile(g:dir . "test.txt", "b")
>
>contents is a list here.
>
>> call add(contents, join(getline(1, '$'), "\n"))
>
>To that list you are adding the current buffer content as a single
>string.
>
>> call writefile(contents, g:dir . "does-this-work.txt", "b")
>
>writefile writes each listitem and because binary mode is set, it will
>replace "\n" by an ASCII NUL.

It is standard Vim NUL "escaping" used in various places (including the output of getline() and internal representation of buffer contents). I have never heard this has absolutely anything to do with binary mode or that using non-binary mode changes how Vim handles it.

>
>> endfunction
>> ---
>>
>> when Append() is called on this buffer content:
>>
>> ---
>> This is one line of text.
>> This is another line.
>> ---
>>
>> gives me the file does-this-work.txt:
>>
>> ---
>> Tis is
>> text this is
>>
>> This is one line of text.^@This is another line.
>> ---
>>
>> In other words it looks like readfile() and writefile() are indeed
>behaving
>> correctly (so that was a mistake on my part -- sorry). Where I'm
>having
>> trouble is with the getline() that gets the buffer contents. If I
>join()
>> it, I don't know how to represent the newlines (obviously '\n'
>doesn't
>> work). If I don't join() it, I get E730 ('using List as a String').
>
>See my comments above.
>
>Best,
>Christian

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