[PATCH 4/4] merge-recursive: options to ignore whitespace changes

[Jonathan Nieder <jrnieder@gmail.com>]

From: Justin Frankel <justin@cockos.com>

Add support for merging with ignoring line endings (specifically
--ignore-space-at-eol) when using recursive merging.  This is
as a strategy-option, so that you can do:

	git merge --strategy-option=ignore-space-at-eol <branch>

and

	git rebase --strategy-option=ignore-space-at-eol <branch>

This can be useful for coping with line-ending damage (Xcode 3.1 has a
nasty habit of converting all CRLFs to LFs, and VC6 tends to just use
CRLFs for inserted lines).

The only option I need is ignore-space-at-eol, but while at it,
include the other xdiff whitespace options (ignore-space-change,
ignore-all-space), too.

[jn: with documentation]

Signed-off-by: Justin Frankel <justin@cockos.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
---
That's the end of the series.  Thoughts (and tests) welcome, as
always.

 Documentation/merge-strategies.txt |   15 +++++++++++++++
 merge-recursive.c                  |    8 ++++++++
 2 files changed, 23 insertions(+), 0 deletions(-)

diff --git a/Documentation/merge-strategies.txt b/Documentation/merge-strategies.txt
index a5ae14f..91faba5 100644
--- a/Documentation/merge-strategies.txt
+++ b/Documentation/merge-strategies.txt
@@ -47,6 +47,21 @@ patience;;
 	this when the branches to be merged have diverged wildly.
 	See also linkgit:git-diff[1] `--patience`.
 
+ignore-space-change;;
+ignore-all-space;;
+ignore-space-at-eol;;
+	Treats lines with the indicated type of whitespace change as
+	unchanged for the sake of a three-way merge.  Whitespace
+	changes mixed with other changes to a line are not ignored.
+	See also linkgit:git-diff[1] `-b`, `-w`, and
+	`--ignore-space-at-eol`.
++
+* If 'their' version only introduces whitespace changes to a line,
+  'our' version is used;
+* If 'our' version introduces whitespace changes but 'their'
+  version includes a substantial change, 'their' version is used;
+* Otherwise, the merge proceeds in the usual way.
+
 renormalize;;
 	This runs a virtual check-out and check-in of all three stages
 	of a file when resolving a three-way merge.  This option is
diff --git a/merge-recursive.c b/merge-recursive.c
index 3e67f81..944ca19 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -1515,6 +1515,14 @@ int parse_merge_opt(struct merge_options *o, const char *s)
 		o->subtree_shift = s + strlen("subtree=");
 	else if (!strcmp(s, "patience"))
 		o->xdl_opts |= XDF_PATIENCE_DIFF;
+	else if (!strcmp(s, "ignore-space-change"))
+		o->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
+	else if (!strcmp(s, "ignore-all-space"))
+		o->xdl_opts |= XDF_IGNORE_WHITESPACE;
+	else if (!strcmp(s, "ignore-space-at-eol"))
+		o->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
+	else if (!strcmp(s, "ignore-space-at-eol"))
+		o->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
 	else if (!strcmp(s, "renormalize"))
 		o->renormalize = 1;
 	else if (!strcmp(s, "no-renormalize"))
-- 
1.7.2.2