Real Vim ninjas count every keystroke - do you?

Pick a challenge, fire up Vim, and show us what you got.

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$ gem install vimgolf
$ vimgolf setup
$ vimgolf put 5e4dfcccaa2db400090b66c3

prepend * to every non-blank line

Prepend an asterisk to every non-blank line in the input file.

Start file

This is a
very short

file, but it is 
still
full

of

surpises.

End file

*This is a
*very short

*file, but it is 
*still
*full

*of

*surpises.

View Diff

1,2c1,2
< This is a
< very short
---
> *This is a
> *very short
4,6c4,6
< file, but it is 
< still
< full
---
> *file, but it is 
> *still
> *full
8c8
< of
---
> *of
10c10
< surpises.
---
> *surpises.

Solutions by @andreas_buhr:

Created by: @johnreitano Tweet

1517 active golfers, 6208 entries

Solutions by @andreas_buhr:

10

#145 - Andreas Buhr / @andreas_buhr

05/19/2020 at 02:13PM

11

#>540 - Andreas Buhr / @andreas_buhr

05/19/2020 at 02:12PM

12

#>766 - Andreas Buhr / @andreas_buhr

05/19/2020 at 02:11PM

13

#>811 - Andreas Buhr / @andreas_buhr

05/19/2020 at 02:11PM

14

#>849 - Andreas Buhr / @andreas_buhr

05/19/2020 at 02:10PM

15

#>929 - Andreas Buhr / @andreas_buhr

05/19/2020 at 02:09PM

16

#>1011 - Andreas Buhr / @andreas_buhr

05/19/2020 at 02:09PM

19

#>1192 - Andreas Buhr / @andreas_buhr

05/19/2020 at 02:07PM

19

#>1192 - Andreas Buhr / @andreas_buhr

05/19/2020 at 02:08PM

20

#>1244 - Andreas Buhr / @andreas_buhr

05/19/2020 at 02:03PM

20

#>1244 - Andreas Buhr / @andreas_buhr

05/19/2020 at 02:06PM

21

#>1310 - Andreas Buhr / @andreas_buhr

05/19/2020 at 02:02PM

22

#>1355 - Andreas Buhr / @andreas_buhr

05/19/2020 at 02:02PM

32

#>1482 - Andreas Buhr / @andreas_buhr

05/19/2020 at 02:00PM