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readr 1.4.0
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@jimhester jimhester released this 06 Oct 13:23
v1.4.0
c0dbb75

Breaking changes

  • write_*() functions first argument is now file instead of path, for consistency with the read_*() functions.
    path has been deprecated and will be removed in a future version of readr (#1110, @brianrice2)

  • write_*() functions now output any NaN values in the same way as NA values, controlled by the na= argument. (#1082).

New features

  • It is now possible to generate a column specification from any tibble (or data.frame) with as.col_spec() and convert any column specification to a short representation with as.character()

    s <- as.col_spec(iris)
s
#> cols(
#>   Sepal.Length = col_double(),
#>   Sepal.Width = col_double(),
#>   Petal.Length = col_double(),
#>   Petal.Width = col_double(),
#>   Species = col_factor(levels = c("setosa", "versicolor", "virginica"), ordered = FALSE, include_na = FALSE)
#> )
as.character(s)
#> [1] "ddddf"

  • The cli package is now used for all messages.

  • The runtime performance for tables with an extreme number of columns is greatly improved (#825)

  • Compressed files are now detected by magic numbers rather than by the file extension (#1125)

  • A memory leak when reading files is now fixed (#1092)

  • write_*() functions gain a eol = argument to control the end of line character used (#857).
    This allows writing of CSV files with Windows newlines (CRLF) if desired.

  • The Rcpp dependency has been removed in favor of cpp11.

  • The build system has been greatly simplified so should work on more systems.

Additional features and fixes

  • The full problem field is now displayed in the problems tibble, as intended (#444).

  • New %h placeholder for parsing unrestricted hours (<0 and >23) to support parsing durations (#549, @krlmlr).

  • as.character.col_spec() now handles logical columns as well (#1127)

  • fwf_positions(end) no longer has a default argument and must be specified (#996)

  • guess_parser() gains a na argument and removes NA values before guessing (#1041).

  • parse_guess() now passes the na argument to guess_parser()

  • read_* functions now close properly all connections, including on errors like HTTP errors when reading from a url (@cderv, #1050).

  • read_delimited() no longer mistakenly stats literal filenames (#1063)

  • read_lines() now ignores quotations when skipping lines (#991).

  • read_lines(skip_empty_rows = TRUE) no longer crashes if a file ends with an empty line (#968)

  • write_*() functions now invisibly return the input data frame unchanged, rather than a version with factors and dates converted to strings. (@jesse-ross, #975).

  • write_csv2() now formats decimal numbers more consistently with utils::write.csv2() (#1087)

  • write_csv2() and format_csv2() no longer pad number columns with whitespaces (@keesdeschepper, #1046).

  • write_excel_csv() no longer outputs a byte order mark when appending to a file (#1075).

  • Uses of tibble::data_frame updated to tibble::tibble (tidyverse/dplyr#4069, @thays42, #1124, @brianrice2)

  • read_delimited() now returns an empty tibble::data_frame() rather than signaling an error when given a connection with an empty file (@pralitp, #963).

  • More helpful error when trying to write out data frames with list columns (@ellessenne, #938)

  • type_convert() removes a 'spec' attribute, because the current columns likely have modified data types. The 'spec' attribute is set by functions like read_delim() (@jimhester, @wibeasley, #1032).

  • write_rds() now can specify the Rds version to use. The default value is 2 as it's compatible to R versions prior to 3.5.0 (@shrektan, #1001).

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