07-06-2017
What did you do to spot the error? Did you download the files in post#1 and run the code against them? did you check for control chars?
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Hi,
file1.txt
AAA
BBB
CCC
DDD
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fmimwe|BBB|fnqwufw|wufbqw
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LEARN ABOUT CENTOS
text::diff::table
Text::Diff::Table(3) User Contributed Perl Documentation Text::Diff::Table(3)
NAME
Text::Diff::Table - Text::Diff plugin to generate "table" format output
SYNOPSIS
use Text::Diff;
diff @a, $b { STYLE => "Table" };
DESCRIPTION
This is a plugin output formatter for Text::Diff that generates "table" style diffs:
+--+----------------------------------+--+------------------------------+
| |../Test-Differences-0.2/MANIFEST | |../Test-Differences/MANIFEST |
| |Thu Dec 13 15:38:49 2001 | |Sat Dec 15 02:09:44 2001 |
+--+----------------------------------+--+------------------------------+
| | * 1|Changes *
| 1|Differences.pm | 2|Differences.pm |
| 2|MANIFEST | 3|MANIFEST |
| | * 4|MANIFEST.SKIP *
| 3|Makefile.PL | 5|Makefile.PL |
| | * 6|t/00escape.t *
| 4|t/00flatten.t | 7|t/00flatten.t |
| 5|t/01text_vs_data.t | 8|t/01text_vs_data.t |
| 6|t/10test.t | 9|t/10test.t |
+--+----------------------------------+--+------------------------------+
This format also goes to some pains to highlight "invisible" characters on differing elements by selectively escaping whitespace. Each
element is split in to three segments (leading whitespace, body, trailing whitespace). If whitespace differs in a segement, that segment
is whitespace escaped.
Here is an example of the selective whitespace.
+--+--------------------------+--------------------------+
| |demo_ws_A.txt |demo_ws_B.txt |
| |Fri Dec 21 08:36:32 2001 |Fri Dec 21 08:36:50 2001 |
+--+--------------------------+--------------------------+
| 1|identical |identical |
* 2| spaced in | also spaced in *
* 3|embedded space |embedded tab *
| 4|identical |identical |
* 5| spaced in | tabbed in *
* 6|trailing spacesss
|trailing tabs
*
| 7|identical |identical |
* 8|lf line
|crlf line
*
* 9|embedded ws |embedded ws *
+--+--------------------------+--------------------------+
Here's why the lines do or do not have whitespace escaped:
lines 1, 4, 7 don't differ, no need.
lines 2, 3 differ in non-whitespace, no need.
lines 5, 6, 8, 9 all have subtle ws changes.
Whether or not line 3 should have that tab character escaped is a judgement call; so far I'm choosing not to.
UNICODE
To output the raw unicode chracters consult the documentation of Text::Diff::Config. You can set the "DIFF_OUTPUT_UNICODE" environment
variable to 1 to output it from the command line. For more information, consult this bug:
<https://rt.cpan.org/Ticket/Display.html?id=54214> .
LIMITATIONS
Table formatting requires buffering the entire diff in memory in order to calculate column widths. This format should only be used for
smaller diffs.
Assumes tab stops every 8 characters, as $DIETY intended.
Assumes all character codes >= 127 need to be escaped as hex codes, ie that the user's terminal is ASCII, and not even "high bit ASCII",
capable. This can be made an option when the need arises.
Assumes that control codes (character codes 0..31) that don't have slash-letter escapes ("
", "
", etc) in Perl are best presented as hex
escapes ("x01") instead of octal ("