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From: Noob on 5 Jan 2010 08:19
Hello,

I'm trying to clean up a C source file with gvim.
(Might not be the appropriate tool...)

AFAICT, I can delete trailing white space with

:%s,[ \t]\+$,,g

i.e. delete space and tab occurring at least once before newline

However, I don't see how to replace N /leading/ tabs with 2N spaces.

(I don't want to just replace every tab with two spaces because
there are non-leading tabs which I want to handle differently.)

Matching them would be

/^[\t]\+

but how do I tell the editor to replace N tabs with 2N spaces?

Regards.
From: Rainer Weikusat on 5 Jan 2010 08:37
Noob <root(a)127.0.0.1> writes:
> I'm trying to clean up a C source file with gvim.
> (Might not be the appropriate tool...)

[...]

> However, I don't see how to replace N /leading/ tabs with 2N spaces.

You don't always have to be clever.

#include <stdio.h>

int main(void)
{
int tabbing, c;

tabbing = 1;
while ((c = getchar()) != EOF) {
if (tabbing) {
switch (c) {
case '\t':
putchar(' ');
c = ' ';
break;

case '\n':
break;

default:
tabbing = 0;
}
} else
if (c == '\n') tabbing = 1;

putchar(c);
}

return 0;
}
From: Nicolas George on 5 Jan 2010 08:49
Noob wrote in message <hhve8p$2ov$1(a)speranza.aioe.org>:
> However, I don't see how to replace N /leading/ tabs with 2N spaces.

You can do something like that:

s/^\t*\zs\t/ /

That will replace the last tab of a leading series of tabs with two spaces.
You repeat the command until the editor does not find the pattern.

You can also use perl:

perl -i -pe 's/^(\t+)/" "x(length $1)/e'
From: Scott Lurndal on 5 Jan 2010 12:53
Noob <root(a)127.0.0.1> writes:
>Hello,
>
>I'm trying to clean up a C source file with gvim.
>(Might not be the appropriate tool...)
>
>AFAICT, I can delete trailing white space with
>
>:%s,[ \t]\+$,,g
>
>i.e. delete space and tab occurring at least once before newline
>
>However, I don't see how to replace N /leading/ tabs with 2N spaces.
>
>(I don't want to just replace every tab with two spaces because
>there are non-leading tabs which I want to handle differently.)
>
>Matching them would be
>
>/^[\t]\+
>
>but how do I tell the editor to replace N tabs with 2N spaces?
>

:%!pr -e2 -t -T

scott
From: Scott Lurndal on 5 Jan 2010 12:56
scott(a)slp53.sl.home (Scott Lurndal) writes:
>Noob <root(a)127.0.0.1> writes:
>>Hello,
>>
>>I'm trying to clean up a C source file with gvim.
>>(Might not be the appropriate tool...)
>>
>>AFAICT, I can delete trailing white space with
>>
>>:%s,[ \t]\+$,,g
>>
>>i.e. delete space and tab occurring at least once before newline
>>
>>However, I don't see how to replace N /leading/ tabs with 2N spaces.
>>
>>(I don't want to just replace every tab with two spaces because
>>there are non-leading tabs which I want to handle differently.)
>>
>>Matching them would be
>>
>>/^[\t]\+
>>
>>but how do I tell the editor to replace N tabs with 2N spaces?
>>
>
>:%!pr -e2 -t -T
>
>scott

Never mind, missed the "leading" part.


scott
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