Add multiple rows

[jennybc]

add_row() wasn't actually adding multiple rows. It was just adding one.

It will still add a row of NAs when no input is given, which I gather is intentional, from existing tests. My actual interest was in recycling with vector input, hence the test for that.

Demo with one of the examples:

df <- tibble(x = 1:3, y = 3:1)

## BEFORE
## multiple rows weren't, in fact, being added; also warnings
add_row(df, x = 4:5, y = 0:-1)
#> # A tibble: 4 × 2
#>       x     y
#> * <int> <int>
#> 1     1     3
#> 2     2     2
#> 3     3     1
#> 4     4     0
#> Warning messages:
#> 1: In rbind(deparse.level, ...) :
#>   number of items to replace is not a multiple of replacement length
#> 2: In rbind(deparse.level, ...) :
#>   number of items to replace is not a multiple of replacement length

## AFTER
## vector inputs do add multiple rows, w/ no warnings
add_row(df, x = 4:5, y = 0:-1)
#> # A tibble: 5 × 2
#>       x     y
#> * <int> <int>
#> 1     1     3
#> 2     2     2
#> 3     3     1
#> 4     4     0
#> 5     5    -1

[codecov-io]

Current coverage is 99.38% (diff: 100%)

Merging #142 into master will not change coverage

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[krlmlr]

Thanks! I tweaked it a bit, and will add before-after logic on top.