How do I use vim registers?
I only know of one instance using registers is via CtrlR* whereby I paste text from a clipboard.
What are other uses of registers? How to use them?
Everything you know about VI registers (let's focus on vi 7.2) -- share with us.
Registers in Vim let you run actions or commands on text stored within them. To access a register, you type "a before a command, where a is the name of a register. If you want to copy the current line into register k , you can type
"kyy
Or you can append to a register by using a capital letter
"Kyy
You can then move through the document and paste it elsewhere using
"kp
To paste from system clipboard on Linux
"+p
To paste from system clipboard on Windows (or from "mouse highlight" clipboard on Linux)
"*p
To access all currently defined registers type
:reg
I was pleased when I discovered the 0 register. If you yank text without assigning it to a particular register, then it will be assigned to the 0 register, as well as being saved in the default " register. The difference between the 0 and " registers is that 0 is only populated with yanked text, whereas the default register is also populated with text deleted using d / D / x / X / c / C / s / S commands.
I find this useful when I want to copy some text, delete something and replace it with the copied text. The following steps illustrate an example:
y[motion] - this text is saved in " and 0 registers d[motion] - this text is saved in " register "0p where " is the command to use a register for the next command.
On the final step, if you were to paste from the default register (with p ), it would use the text that you had just deleted (probably not what you intended).
Note that p or P pastes from the default register. The longhand equivalent would be ""p (or ""P ) and "0 holds the last yank, "1 holds the last delete or change.
For more info see :help registers .
One of my favorite parts about registers is using them as macros!
Let's say you are dealing with a tab-delimited value file as such:
ID Df %Dev Lambda
1 0 0.000000 0.313682
2 1 0.023113 0.304332
3 1 0.044869 0.295261
4 1 0.065347 0.286460
5 1 0.084623 0.277922
6 1 0.102767 0.269638
7 1 0.119845 0.261601
Now you decide that you need to add a percentage sign at the end of the %Dev field (starting from 2nd line). We'll make a simple macro in the (arbitrarily selected) m register as follows:
Press: qm : To start recording macro under m register.
EE : Go to the end of the 3rd column.
a : Insert mode to append to the end of this column.
% : Type the percent sign we want to add.
<ESC> : Get back into command mode.
j0 : Go to beginning of next line.
q : Stop recording macro
We can now just type @m to run this macro on the current line. Furthermore, we can type @@ to repeat, or 100@m to do this 100 times! Life's looking pretty good.
At this point you should be saying, " BUT WAIT, WHAT THE HECK DOES THIS HAVE TO DO WITH REGISTERS ?"
Excellent point. Let's investigate what is in the contents of the m register by typing "mp . We then get the following:
EEa%<ESC>j0
At first this looks like you accidentally opened a binary file in notepad, but upon second glance, it's the exact sequence of characters in our macro!
You are a curious person, so let's do something interesting and edit this line of text to insert a ! instead of boring old % .
EEa!<ESC>j0
Then let's yank this into the n register by typing B"nyE . Then, just for kicks, let's run the n macro on a line of our data using @n ....
OMG, IT ADDED A !
Essentially, running a macro is like pressing the exact sequence of keys in that macro's register. If that isn't a cool register trick, I'll eat my hat.
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