Run Vim command on current C/C++/Java function
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Tip 945 Previous Next Created: June 5, 2005 Complexity: basic Author: Lorenz Wegener Version: 5.7
It is often useful to restrict the range of commands like s or g to the function one is currently editing. For C/C++ and Java,
:cmap ;tf ?^{??(?,/^}/
maps the keystrokes ;tf (this function) to the range of the function in which the cursor is currently located. It works by searching backwards for a { occurring in the first column, and then for a ( to find the start of the function. A } in the first column ends the function body.
For example, suppose you want to change the name of a function argument in the current function from i to ii:
int foo(int i,
int j)
{
// ...
i++;
return i;
}
In normal mode, type :;tf followed by the subsitution command s/\/ii/g</tt>. The command line now reads:
:?^{??(?,/^}/s/\<i\>/ii/g
Press Enter to execute the command. The function changes to:
int foo(int ii,
int j)
{
// ...
ii++;
return ii;
}
The range can be used with other commands too.
This tip assumes that:
- Your source code is indented, so that curly braces on the first column always open or close a function body.
- A function name is followed by a <tt>(</tt>. This is true in C, mostly true in C++ and Java, and true to a limited extend in Perl.
This tip does not work for constructor definitions in C++ and Java, since they can contain many parentheses, for example:
Foo(int bar, int baz):
mBar(bar),
mBaz(baz)
{}
[edit] Comments
I don't know a lot of people that actually put braces on the first column in Java, except for the class.
It is not the case in C++ either if you use namespaces.
It's used in K&R-Style
This is pretty cool if you forget to do <tt>va{</tt> (or similar) first, but text-object methods should be discussed as well.
