[R] readLines() and unz() and non-empty final line

[Ebert,Timothy Aaron]

I had something like this problem where the program read files but some files would be missing the last line of data. My solution was to write another program that looked at the files and if a file did not end in a line feed to add one. Possibly a bit primitive, but it worked.
Regards,
Tim

-----Original Message-----
From: R-help <r-help-bounces using r-project.org> On Behalf Of Marttila Mikko via R-help
Sent: Thursday, October 24, 2024 8:00 AM
To: r-help using r-project.org
Subject: [R] readLines() and unz() and non-empty final line

[External Email]

Dear list,

I'm seeing a strange interaction with readLines() and unz() when reading a file without an empty final line. The final line gets dropped silently:

> cat("hello", file = "hello.txt")
> zip("hello.zip", "hello.txt")
  adding: hello.txt (stored 0%)
> readLines(unz("hello.zip", "hello.txt"))
character(0)

The documentation for readLines() says if the final line is incomplete for "non-blocking text-mode connections" the line is "pushed back, silently"
but otherwise "accepted with a warning".

My understanding is that the unz() here is blocking so the line should be accepted. Is that incorrect? If so, how would I go about reading such lines from a zip file?

Best,

Mikko


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