cdif - word context diff
cdif [option] file1 file2
cdif [option] [diff-data]
-c, -Cn context diff -u, -Un unified diff -i ignore case -b ignore space change -w ignore whitespace -t expand tabs --rcs use rcsdiff -r<rev>, -q rcs options -B, --char char-by-char comparison --diff=command specify diff command --subdiff=command specify backend diff command --stat show statistical information --colormap=s specify color map --[no]color color or not (default true) --[no]256 ANSI 256 color mode (default true) --[no]commandcolor color for command line (default true) --[no]markcolor color for diff mark (default true) --[no]textcolor color for normal text (default true) --[no]unknowncolor color for unknown text (default true) --[no]old print old text (default true) --[no]new print new text (default true) --[no]command print diff command line (default true) --[no]unknown print unknown line (default true) --[no]mark print mark or not (default true) --[no]prefix read git --graph output (default true) --prefix-pattern prefix pattern --visible char=? set visible attributes --[no]mecab use mecab tokenizer (default false)
cdif is a post-processor of the Unix diff command. It highlights deleted, changed and added words based on word context.
You may want to compare character-by-character rather than word-by-word. Option -B option can be used for that purpose.
If only one file is specified, cdif reads that file (stdin if no file) as a output from diff command.
Lines those don't look like diff output are simply ignored and printed.
Almost same as diff command.
- --rcs, -rrev, -q
Use rcsdiff instead of normal diff. Option --rcs is not required when -rrev is supplied.
- -B, --char
Compare the data character-by-character context.
Specify the diff command to use.
Specify the backend diff command to get word differences. Accept normal and unified diff format.
If you want to use git diff command, don't forget to set -U0 option.
--subdiff="git diff -U0 --no-index --histogram"
Use ANSI color escape sequence for output.
- --colormap=colormap, --cm=colormap
Basic colormap format is :
where the FIELD is one from these :
COMMAND Command line OMARK Old mark NMARK New mark OTEXT Old text NTEXT New text OCHANGE Old change part NCHANGE New change part APPEND Appended part DELETE Deleted part
and additional Common and Merged FIELDs for git-diff combined format.
CMARK Common mark CTEXT Common text MMARK Merged mark MTEXT Merged text
You can make multiple fields same color joining them by = :
Also wildcard can be used for field name :
Multiple fields can be specified by repeating options
--cm FILED1=COLOR1 --cm FIELD2=COLOR2 ...
or combined with comma (,) :
--cm FILED1=COLOR1,FIELD2=COLOR2, ...
Color specification is a combination of single uppercase character representing 8 colors :
R Red G Green B Blue C Cyan M Magenta Y Yellow K Black W White
and alternative (usually brighter) colors in lowercase :
r, g, b, c, m, y, k, w
or RGB values and 24 grey levels if using ANSI 256 or full color terminal :
(255,255,255) : 24bit decimal RGB colors #000000 .. #FFFFFF : 24bit hex RGB colors #000 .. #FFF : 12bit hex RGB 4096 colors 000 .. 555 : 6x6x6 RGB 216 colors L00 .. L25 : Black (L00), 24 grey levels, White (L25)
Begining # can be omitted in 24bit RGB notation.
When values are all same in 24bit or 12bit RGB, it is converted to 24 grey level, otherwise 6x6x6 216 color.
or color names enclosed by angle bracket :
<red> <blue> <green> <cyan> <magenta> <yellow> <aliceblue> <honeydue> <hotpink> <mooccasin> <medium_aqua_marine>
with other special effects :
Z 0 Zero (reset) D 1 Double-struck (boldface) P 2 Pale (dark) I 3 Italic U 4 Underline F 5 Flash (blink: slow) Q 6 Quick (blink: rapid) S 7 Stand-out (reverse video) V 8 Vanish (concealed) J 9 Junk (crossed out) E Erase Line ; No effect X No effect / Toggle foreground/background ^ Reset to foreground
At first the color is considered as foreground, and slash (
/) switches foreground and background. If multiple colors are given in the same spec, all indicators are produced in the order of their presence. Consequently, the last one takes effect.
If the spec start with plus (
+) or minus (
-) character, following characters are appneded/deleted from previous value. Reset mark (
^) is inserted before appended string.
Effect characters are case insensitive, and can be found anywhere and in any order in color spec string. Because
;takes no effect, you can use them to improve readability, like
Defaults are :
COMMAND => "555/222E" OMARK => "CS" NMARK => "MS" OTEXT => "C" NTEXT => "M" OCHANGE => "K/445" NCHANGE => "K/445" DELETE => "K/544" APPEND => "K/544" CMARK => "GS" MMARK => "YS" CTEXT => "G" MTEXT => "Y"
This is equivalent to :
cdif --cm 'COMMAND=555/222E,OMARK=CS,NMARK=MS' \ --cm 'OTEXT=C,NTEXT=M,*CHANGE=BD/445,DELETE=APPEND=RD/544' \ --cm 'CMARK=GS,MMARK=YS,CTEXT=G,MTEXT=Y'
- --[no]commandcolor, --cc
- --[no]markcolor, --mc
- --[no]textcolor, --tc
- --[no]unknowncolor, --uc
Enable/Disable using color for the corresponding field.
- --[no]old, --[no]new
Print or not old/new text in diff output.
Print or not command lines preceding diff output.
Print or not lines not look like diff output.
Print or not marks at the top of diff output lines. At this point, this option is effective only for unified diff.
Next example produces the output exactly same as new except visual effects.
cdif -U100 --no-mark --no-old --no-command --no-unknown old new
These options are prepared for watchdiff(1) command.
Understand prefix for diff output including git --graph option. True by default.
Specify prefix pattern in regex. Default pattern is:
(?:\| )*(?: )*
This pattern matches git graph style and whitespace indented diff output.
- --visible chaname=[0,1]
Set visible attribute for specified characters. Default visible: nul, bel, bs, vt, np, cr, esc, del. Default invisible: ht, nl, sp. See ascii(7) for name representation.
Multiple characters can be specified at once, by assembling them by commna (
--visible ht=1,sp=1; or connecting them by equal sign (
--visible ht=sp=1. Character name accept wildcard;
Currently this option is effective only for modified lines.
Set CARRIAGE-RETURN and ESCAPE visible attributes. These options will be deprecated soon. Use --visible option instead.
Use mecab command as a tokenizer. External command mecab is required.
Print statistical information at the end of output. It shows number of total appended/deleted/changed words in the context of cdif. It's common to have many insertions and deletions of newlines because of text filling process. So normal information is followed by modified number which ignores insert/delete newlines.
Environment variable CDIFOPTS is used to set default options.
- Kazumasa Utashiro
Copyright 1992-2020 Kazumasa Utashiro
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
cdif is naturally not very fast because it uses normal diff command as a back-end processor to compare words.