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diff: add --word-diff option that generalizes --color-words

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This teaches the --color-words engine a more general interface that
supports two new modes:

* --word-diff=plain, inspired by the 'wdiff' utility (most similar to
  'wdiff -n <old> <new>'): uses delimiters [-removed-] and {+added+}

* --word-diff=porcelain, which generates an ad-hoc machine readable
  format:
  - each diff unit is prefixed by [-+ ] and terminated by newline as
    in unified diff
  - newlines in the input are output as a line consisting only of a
    tilde '~'

Both of these formats still support color if it is enabled, using it
to highlight the differences.  --color-words becomes a synonym for
--word-diff=color, which is the color-only format.  Also adds some
compatibility/convenience options.

Thanks to Junio C Hamano and Miles Bader for good ideas.

Signed-off-by: Thomas Rast <trast@student.ethz.ch>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Thomas Rast
2010-04-14 17:59:06 +02:00
committed by Junio C Hamano
parent 6555b196f0
commit 882749a04f
7 changed files with 288 additions and 54 deletions
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10
diff.h
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@ -54,7 +54,7 @@ typedef void (*diff_format_fn_t)(struct diff_queue_struct *q,
#define DIFF_OPT_FIND_COPIES_HARDER (1 << 6)
#define DIFF_OPT_FOLLOW_RENAMES (1 << 7)
#define DIFF_OPT_COLOR_DIFF (1 << 8)
#define DIFF_OPT_COLOR_DIFF_WORDS (1 << 9)
/* (1 << 9) unused */
#define DIFF_OPT_HAS_CHANGES (1 << 10)
#define DIFF_OPT_QUICK (1 << 11)
#define DIFF_OPT_NO_INDEX (1 << 12)
@ -79,6 +79,13 @@ typedef void (*diff_format_fn_t)(struct diff_queue_struct *q,
#define DIFF_XDL_SET(opts, flag) ((opts)->xdl_opts |= XDF_##flag)
#define DIFF_XDL_CLR(opts, flag) ((opts)->xdl_opts &= ~XDF_##flag)
enum diff_words_type {
DIFF_WORDS_NONE = 0,
DIFF_WORDS_PORCELAIN,
DIFF_WORDS_PLAIN,
DIFF_WORDS_COLOR
};
struct diff_options {
const char *filter;
const char *orderfile;
@ -108,6 +115,7 @@ struct diff_options {
int stat_width;
int stat_name_width;
const char *word_regex;
enum diff_words_type word_diff;
/* this is set by diffcore for DIFF_FORMAT_PATCH */
int found_changes;