read_delim causes R to hang

[ggrothendieck]

This works.

library(readr)

Lines <- "2021 Sep 27 15:54:50     avg_dur     =      0.321 s
2021 Sep 27 15:54:52     avg_dur     =      0.036 s
2021 Sep 27 15:54:54     avg_dur     =      0.350 s
2021 Sep 27 15:54:56     avg_dur     =      0.317 s"

read_delim(Lines, delim = "=")
## snip

packageVersion("readr")
## [1] ‘2.0.2’
R.version.string
## [1] "R version 4.1.1 Patched (2021-09-21 r80946)"
win.version()
## [1] "Windows 10 x64 (build 19042)"

but this causes R to hang:

library(readr)

Lines <- "2021 Sep 27 15:54:50     avg_dur     =      0.321 s
2021 Sep 27 15:54:52     avg_dur     =      0.036 s
2021 Sep 27 15:54:54     avg_dur     =      0.350 s
2021 Sep 27 15:54:56     avg_dur     =      0.317 s"

read_delim(Lines, delim = "=", comment = "s")

[jhollist]

I am seeing similar behavior on one line files:

library(readr)

# Two lines, no header: works
file_con <- file("twolines.txt")
writeLines("'A'|'B'|'C'|1|2|3\n'A'|'B'|'C'|1|2|3", con = file_con)
close(file_con)

read_delim("twolines.txt", col_names = FALSE)

# One line, no header, with new line: works
file_con <- file("oneline_newline.txt")
writeLines("'A'|'B'|'C'|1|2|3\n", con = file_con)
close(file_con)

read_delim("oneline_newline.txt", col_names = FALSE)

# One line, no header: hangs
file_con <- file("oneline.txt")
writeLines("'A'|'B'|'C'|1|2|3", con = file_con)
close(file_con)

read_delim("oneline.txt", col_names = FALSE)

Hopefully this adds another bit of information.

[jimhester]

Thanks for the reproducible example, it was a great help!

This should be fixed in the next release version of vroom.