Don't print number of rows if all rows printed

[hadley]

e.g.

> data_frame(x = 1:4)
Source: local data frame [4 x 1]

      x
  (int)
1     1
2     2
3     3
4     4

would be better as

> data_frame(x = 1:4)
      x
  (int)
1     1
2     2
3     3
4     4

This normally doesn't matter, but it's useful for books where space is at a premium

[krlmlr]

I'd rather not add special handling here. You can always do data_frame(x = 1:4) %>% trunc_mat or override knit_print.data_frame if space matters. I feel that consistent output can help reducing cognitive load.

[krlmlr]

...but perhaps we can support this with an optional argument save_space = FALSE?

[hadley]

This is important for me. I don't think it's necessary to print a summary of an object when you can see the whole thing.

[krlmlr]

What about the information "Source: local data frame"? I don't see how it becomes less relevant just because the result is small.

May I suggest an alternative printing mode that omits the "Source: ..." information altogether, and adds the remaining number of rows only in case of vertical overflow:

> iris %>% tibble::tbl_df %>% print(n = 6, save_space = TRUE)
   Sepal.Length Sepal.Width Petal.Length Petal.Width Species
          (dbl)       (dbl)        (dbl)       (dbl)  (fctr)
1           5.1         3.5          1.4         0.2  setosa
2           4.9         3.0          1.4         0.2  setosa
3           4.7         3.2          1.3         0.2  setosa
4           4.6         3.1          1.5         0.2  setosa
5           5.0         3.6          1.4         0.2  setosa
6           5.4         3.9          1.7         0.4  setosa
   ... (144 more rows)

> iris %>% tibble::tbl_df %>% head %>% print(n = 6, save_space = TRUE)
   Sepal.Length Sepal.Width Petal.Length Petal.Width Species
          (dbl)       (dbl)        (dbl)       (dbl)  (fctr)
1           5.1         3.5          1.4         0.2  setosa
2           4.9         3.0          1.4         0.2  setosa
3           4.7         3.2          1.3         0.2  setosa
4           4.6         3.1          1.5         0.2  setosa
5           5.0         3.6          1.4         0.2  setosa
6           5.4         3.9          1.7         0.4  setosa

This would be both concise and consistent.

[hadley]

I don't like it as an extra parameter because I don't think anyone will use it. Maybe if it was also a global option.

[krlmlr]

I like the option idea, we might add different printing styles later.

[krlmlr]

New option tibble.show.source.

[github-actions]

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