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linux/scripts/cleanfile at master · fabgithub/linux · GitHub
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executable file
·
176 lines (147 loc) · 3.41 KB
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cleanfile
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#
!/usr/bin/perl -w
#
#
Clean a text file -- or directory of text files -- of stealth whitespace.
#
WARNING: this can be a highly destructive operation. Use with caution.
#
use
bytes;
use
File::Basename;
#
Default options
$max_width
= 79;
#
Clean up space-tab sequences, either by removing spaces or
#
replacing them with tabs.
sub
clean_space_tabs
($)
{
no
bytes;
#
Tab alignment depends on characters
my
(
$li
) =
@_
;
my
(
$lo
) =
'
'
;
my
$pos
= 0;
my
$nsp
= 0;
my
(
$i
,
$c
);
for
(
$i
= 0;
$i
<
length
(
$li
);
$i
++) {
$c
=
substr
(
$li
,
$i
, 1);
if
(
$c
eq
"
\t
"
) {
my
$npos
= (
$pos
+
$nsp
+8) & ~7;
my
$ntab
= (
$npos
>> 3) - (
$pos
>> 3);
$lo
.=
"
\t
"
x
$ntab
;
$pos
=
$npos
;
$nsp
= 0;
}
elsif
(
$c
eq
"
\n
"
||
$c
eq
"
\r
"
) {
$lo
.=
"
"
x
$nsp
;
$pos
+=
$nsp
;
$nsp
= 0;
$lo
.=
$c
;
$pos
= 0;
}
elsif
(
$c
eq
"
"
) {
$nsp
++;
}
else
{
$lo
.=
"
"
x
$nsp
;
$pos
+=
$nsp
;
$nsp
= 0;
$lo
.=
$c
;
$pos
++;
}
}
$lo
.=
"
"
x
$nsp
;
return
$lo
;
}
#
Compute the visual width of a string
sub
strwidth
($) {
no
bytes;
#
Tab alignment depends on characters
my
(
$li
) =
@_
;
my
(
$c
,
$i
);
my
$pos
= 0;
my
$mlen
= 0;
for
(
$i
= 0;
$i
<
length
(
$li
);
$i
++) {
$c
=
substr
(
$li
,
$i
,1);
if
(
$c
eq
"
\t
"
) {
$pos
= (
$pos
+8) & ~7;
}
elsif
(
$c
eq
"
\n
"
) {
$mlen
=
$pos
if
(
$pos
>
$mlen
);
$pos
= 0;
}
else
{
$pos
++;
}
}
$mlen
=
$pos
if
(
$pos
>
$mlen
);
return
$mlen
;
}
$name
= basename(
$0
);
@files
= ();
while
(
defined
(
$a
=
shift
(
@ARGV
))) {
if
(
$a
=~
/
^-
/
) {
if
(
$a
eq
'
-width
'
||
$a
eq
'
-w
'
) {
$max_width
=
shift
(
@ARGV
)+0;
}
else
{
print
STDERR
"
Usage:
$name
[-width #] files...
\n
"
;
exit
1;
}
}
else
{
push
(
@files
,
$a
);
}
}
foreach
$f
(
@files
) {
print
STDERR
"
$name
:
$f
\n
"
;
if
(!
-f
$f
) {
print
STDERR
"
$f
: not a file
\n
"
;
next
;
}
if
(!
open
(FILE,
'
+<
'
,
$f
)) {
print
STDERR
"
$name
: Cannot open file:
$f
:
$!
\n
"
;
next
;
}
binmode
FILE;
#
First, verify that it is not a binary file; consider any file
#
with a zero byte to be a binary file. Is there any better, or
#
additional, heuristic that should be applied?
$is_binary
= 0;
while
(
read
(FILE,
$data
, 65536) > 0) {
if
(
$data
=~
/
\0
/
) {
$is_binary
= 1;
last
;
}
}
if
(
$is_binary
) {
print
STDERR
"
$name
:
$f
: binary file
\n
"
;
next
;
}
seek
(FILE, 0, 0);
$in_bytes
= 0;
$out_bytes
= 0;
$blank_bytes
= 0;
@blanks
= ();
@lines
= ();
$lineno
= 0;
while
(
defined
(
$line
= <FILE>) ) {
$lineno
++;
$in_bytes
+=
length
(
$line
);
$line
=~
s
/
[
\t\r
]*$
//
;
#
Remove trailing spaces
$line
= clean_space_tabs(
$line
);
if
(
$line
eq
"
\n
"
) {
push
(
@blanks
,
$line
);
$blank_bytes
+=
length
(
$line
);
}
else
{
push
(
@lines
,
@blanks
);
$out_bytes
+=
$blank_bytes
;
push
(
@lines
,
$line
);
$out_bytes
+=
length
(
$line
);
@blanks
= ();
$blank_bytes
= 0;
}
$l_width
= strwidth(
$line
);
if
(
$max_width
&&
$l_width
>
$max_width
) {
print
STDERR
"
$f
:
$lineno
: line exceeds
$max_width
characters (
$l_width
)
\n
"
;
}
}
#
Any blanks at the end of the file are discarded
if
(
$in_bytes
!=
$out_bytes
) {
#
Only write to the file if changed
seek
(FILE, 0, 0);
print
FILE
@lines
;
if
( !
defined
(
$where
=
tell
(FILE)) ||
!
truncate
(FILE,
$where
) ) {
die
"
$name
: Failed to truncate modified file:
$f
:
$!
\n
"
;
}
}
close
(FILE);
}
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