From cf958afd8368ebce1cabb2f7ae2799306cc2de03 Mon Sep 17 00:00:00 2001 From: Matthieu Moy Date: Thu, 5 Aug 2010 18:14:25 +0200 Subject: [PATCH] Document -B[/], -M and -C variants of -B, -M and -C These options take an optional argument, but this optional argument was not documented. Original patch by Matthieu Moy, but documentation for -B mostly copied from the explanations of Junio C Hamano. While we're there, fix a typo in a comment in diffcore.h. Signed-off-by: Matthieu Moy Signed-off-by: Junio C Hamano --- Documentation/diff-options.txt | 35 +++++++++++++++++++++++++++++----- diffcore.h | 2 +- 2 files changed, 31 insertions(+), 6 deletions(-) diff --git a/Documentation/diff-options.txt b/Documentation/diff-options.txt index 2371262b1..eecedaab6 100644 --- a/Documentation/diff-options.txt +++ b/Documentation/diff-options.txt @@ -206,10 +206,29 @@ endif::git-format-patch[] the diff-patch output format. Non default number of digits can be specified with `--abbrev=`. --B:: - Break complete rewrite changes into pairs of delete and create. - --M:: +-B[][/]:: + Break complete rewrite changes into pairs of delete and + create. This serves two purposes: ++ +It affects the way a change that amounts to a total rewrite of a file +not as a series of deletion and insertion mixed together with a very +few lines that happen to match textually as the context, but as a +single deletion of everything old followed by a single insertion of +everything new, and the number `m` controls this aspect of the -B +option (defaults to 60%). `-B/70%` specifies that less than 30% of the +original should remain in the result for git to consider it a total +rewrite (i.e. otherwise the resulting patch will be a series of +deletion and insertion mixed together with context lines). ++ +When used with -M, a totally-rewritten file is also considered as the +source of a rename (usually -M only considers a file that disappeared +as the source of a rename), and the number `n` controls this aspect of +the -B option (defaults to 50%). `-B20%` specifies that a change with +addition and deletion compared to 20% or more of the file's size are +eligible for being picked up as a possible source of a rename to +another file. + +-M[]:: ifndef::git-log[] Detect renames. endif::git-log[] @@ -218,9 +237,15 @@ ifdef::git-log[] For following files across renames while traversing history, see `--follow`. endif::git-log[] + If `n` is specified, it is a is a threshold on the similarity + index (i.e. amount of addition/deletions compared to the + file's size). For example, `-M90%` means git should consider a + delete/add pair to be a rename if more than 90% of the file + hasn't changed. --C:: +-C[]:: Detect copies as well as renames. See also `--find-copies-harder`. + If `n` is specified, it has the same meaning as for `-M`. ifndef::git-format-patch[] --diff-filter=[ACDMRTUXB*]:: diff --git a/diffcore.h b/diffcore.h index 491bea0b4..fed9b151b 100644 --- a/diffcore.h +++ b/diffcore.h @@ -18,7 +18,7 @@ #define MAX_SCORE 60000.0 #define DEFAULT_RENAME_SCORE 30000 /* rename/copy similarity minimum (50%) */ #define DEFAULT_BREAK_SCORE 30000 /* minimum for break to happen (50%) */ -#define DEFAULT_MERGE_SCORE 36000 /* maximum for break-merge to happen 60%) */ +#define DEFAULT_MERGE_SCORE 36000 /* maximum for break-merge to happen (60%) */ #define MINIMUM_BREAK_SIZE 400 /* do not break a file smaller than this */ -- 2.30.2