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prettier print of data.table #1091

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prettier print of data.table#1091
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feature request

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@jangorecki
jangorecki
opened on Mar 22, 2015

A FR for mainly character processing just right before the print.
When DT is already filtered to non more than 100 rows (default print nrow).
There might be character processing, like:
a) detect and handle \n
b) trunc character after x nchars

library(data.table)

dt <- data.table(a = 1:3, b = c("asda\nzxcz","asdas","CREATE TABLE ASD AS\nSELECT *\nFROM DUAL"))
dt # current
#    a                                        b
#1: 1                               asda\nzxcz
#2: 2                                    asdas
#3: 3 CREATE TABLE ASD AS\nSELECT *\nFROM DUAL

options("datatable.print.word.wrap"=TRUE)
dt # handle \n
#    a                     b
#1: 1                asda ¬
#2: 2                 asdas
#3: 3 CREATE TABLE ASD AS ¬

options("datatable.print.word.wrap"=FALSE,
        "datatable.print.trunc.char"=5L) # default value: 252
dt # handle long characters
#    a        b
#1: 1 asda\...
#2: 2    asdas
#3: 3 CREAT...

Of course it would be only a print, the data.table returned would contains all the data.

Activity

  1. arunsrinivasan
    added
    feature request
    on Mar 26, 2015

  2. arunsrinivasan commented on Mar 26, 2015

    @arunsrinivasan
    arunsrinivasan
    on Mar 26, 2015
    Member

    @jangorecki like this very much.. do you think you can issue a PR? Else, I'll take a look at it.

  3. arunsrinivasan commented on Mar 26, 2015

    @arunsrinivasan
    arunsrinivasan
    on Mar 26, 2015
    Member

    What'd also be nice to somehow some the column type while printing as well.. I've had this on my mind for a while. Instead of doing str() or sapply(DT, class)..

  4. jangorecki
    added a commit that references this issue on Apr 1, 2015

    slim print for character, closes Rdatatable#1091

    f15ac77
  5. jangorecki
    added a commit that references this issue on Apr 12, 2015

    pretty print of character while print.data.table, closes Rdatatable#1091

    c9f55ee
  6. arunsrinivasan
    closed this as completedin c9f55eeon May 3, 2015
  7. arunsrinivasan
    added a commit that references this issue on May 3, 2015

    Merge pull request #1102 from jangorecki/slim_print

    b4b5bba

  8. arunsrinivasan commented on May 3, 2015

    @arunsrinivasan
    arunsrinivasan
    on May 3, 2015
    Member

    Have to:

    • add test,
    • assign NULL to global options in onLoad.R and
    • global option to datatable.prettyprint.char.
  9. arunsrinivasan
    added 3 commits that reference this issue on May 3, 2015

    Added tests for #1091, changed global option to prettyprint.char.

    fd37731

    Updated README for #1091.

    1348cbf

    Restore original global option test 1515, #1091.

    2b3b7c8
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