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checkout --conflict=<style>: recreate merge in a non-default style 

This new option does essentially the same thing as -m option when checking
unmerged paths out of the index, but it uses the specified style instead
of configured merge.conflictstyle.

Setting "merge.conflictstyle" to "diff3" is usually less useful than using
the default "merge" style, because the latter allows a conflict that
results by both sides changing the same region in a very similar way to
get simplified substancially by reducing the common lines.  However, when
one side removed a group of lines (perhaps a function was moved to some
other file) while the other side modified it, the default "merge" style
does not give any clue as to why the hunk is left conflicting.  You would
need the original to understand what is going on.

The recommended use would be not to set merge.conflictstyle variable so
that you would usually use the default "merge" style conflict, and when
the result in a path in a particular merge is too hard to understand, use
"git checkout --conflict=diff3 $path" to check it out with the original to
review what is going on.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano 2008-08-31 19:32:40 -07:00
parent 0cf8581e33
commit eac5a40151
3 changed files with 72 additions and 48 deletions
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10
Documentation/git-checkout.txt
View File

@ -9,7 +9,7 @@ SYNOPSIS
--------
[verse]
'git checkout' [-q] [-f] [[--track | --no-track] -b <new_branch> [-l]] [-m] [<branch>]
'git checkout' [-f|--ours|--theirs|-m] [<tree-ish>] [--] <paths>...
'git checkout' [-f|--ours|--theirs|-m|--conflict=<style>] [<tree-ish>] [--] <paths>...
DESCRIPTION
-----------
@ -84,6 +84,7 @@ entries; instead, unmerged entries are ignored.
based sha1 expressions such as "<branchname>@\{yesterday}".
-m::
--merge::
When switching branches,
if you have local modifications to one or more files that
are different between the current branch and the branch to
@ -101,6 +102,13 @@ should result in deletion of the path).
When checking out paths from the index, this option lets you recreate
the conflicted merge in the specified paths.
--conflict=<style>::
The same as --merge option above, but changes the way the
conflicting hunks are presented, overriding the
merge.conflictstyle configuration variable. Possible values are
"merge" (default) and "diff3" (in addition to what is shown by
"merge" style, shows the original contents).
<new_branch>::
Name for the new branch.

10
builtin-checkout.c
View File

@ -580,6 +580,7 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
const char *arg;
struct branch_info new;
struct tree *source_tree = NULL;
char *conflict_style = NULL;
struct option options[] = {
OPT__QUIET(&opts.quiet),
OPT_STRING('b', NULL, &opts.new_branch, "new branch", "branch"),
@ -591,7 +592,9 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
OPT_SET_INT('3', "theirs", &opts.writeout_stage, "stage",
3),
OPT_BOOLEAN('f', NULL, &opts.force, "force"),
OPT_BOOLEAN('m', NULL, &opts.merge, "merge"),
OPT_BOOLEAN('m', "merge", &opts.merge, "merge"),
OPT_STRING(0, "conflict", &conflict_style, "style",
"conflict style (merge or diff3)"),
OPT_END(),
};
int has_dash_dash;
@ -606,6 +609,11 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
argc = parse_options(argc, argv, options, checkout_usage,
PARSE_OPT_KEEP_DASHDASH);
if (conflict_style) {
opts.merge = 1; /* implied */
git_xmerge_config("merge.conflictstyle", conflict_style, NULL);
}
if (!opts.new_branch && (opts.track != git_branch_track))
die("git checkout: --track and --no-track require -b");

100
t/t7201-co.sh
View File

@ -337,7 +337,7 @@ test_expect_success \
test refs/heads/delete-me = "$(git symbolic-ref HEAD)" &&
test_must_fail git checkout --track -b track'
test_expect_success 'checkout an unmerged path should fail' '
setup_conflicting_index () {
rm -f .git/index &&
O=$(echo original | git hash-object -w --stdin) &&
A=$(echo ourside | git hash-object -w --stdin) &&
@ -348,7 +348,11 @@ test_expect_success 'checkout an unmerged path should fail' '
echo "100644 $A 2 file" &&
echo "100644 $B 3 file" &&
echo "100644 $A 0 filf"
) | git update-index --index-info &&
) | git update-index --index-info
}
test_expect_success 'checkout an unmerged path should fail' '
setup_conflicting_index &&
echo "none of the above" >sample &&
cat sample >fild &&
cat sample >file &&
@ -360,17 +364,7 @@ test_expect_success 'checkout an unmerged path should fail' '
'
test_expect_success 'checkout with an unmerged path can be ignored' '
rm -f .git/index &&
O=$(echo original | git hash-object -w --stdin) &&
A=$(echo ourside | git hash-object -w --stdin) &&
B=$(echo theirside | git hash-object -w --stdin) &&
(
echo "100644 $A 0 fild" &&
echo "100644 $O 1 file" &&
echo "100644 $A 2 file" &&
echo "100644 $B 3 file" &&
echo "100644 $A 0 filf"
) | git update-index --index-info &&
setup_conflicting_index &&
echo "none of the above" >sample &&
echo ourside >expect &&
cat sample >fild &&
@ -383,17 +377,7 @@ test_expect_success 'checkout with an unmerged path can be ignored' '
'
test_expect_success 'checkout unmerged stage' '
rm -f .git/index &&
O=$(echo original | git hash-object -w --stdin) &&
A=$(echo ourside | git hash-object -w --stdin) &&
B=$(echo theirside | git hash-object -w --stdin) &&
(
echo "100644 $A 0 fild" &&
echo "100644 $O 1 file" &&
echo "100644 $A 2 file" &&
echo "100644 $B 3 file" &&
echo "100644 $A 0 filf"
) | git update-index --index-info &&
setup_conflicting_index &&
echo "none of the above" >sample &&
echo ourside >expect &&
cat sample >fild &&
@ -408,17 +392,7 @@ test_expect_success 'checkout unmerged stage' '
'
test_expect_success 'checkout with --merge' '
rm -f .git/index &&
O=$(echo original | git hash-object -w --stdin) &&
A=$(echo ourside | git hash-object -w --stdin) &&
B=$(echo theirside | git hash-object -w --stdin) &&
(
echo "100644 $A 0 fild" &&
echo "100644 $O 1 file" &&
echo "100644 $A 2 file" &&
echo "100644 $B 3 file" &&
echo "100644 $A 0 filf"
) | git update-index --index-info &&
setup_conflicting_index &&
echo "none of the above" >sample &&
echo ourside >expect &&
cat sample >fild &&
@ -439,17 +413,7 @@ test_expect_success 'checkout with --merge' '
test_expect_success 'checkout with --merge, in diff3 -m style' '
git config merge.conflictstyle diff3 &&
rm -f .git/index &&
O=$(echo original | git hash-object -w --stdin) &&
A=$(echo ourside | git hash-object -w --stdin) &&
B=$(echo theirside | git hash-object -w --stdin) &&
(
echo "100644 $A 0 fild" &&
echo "100644 $O 1 file" &&
echo "100644 $A 2 file" &&
echo "100644 $B 3 file" &&
echo "100644 $A 0 filf"
) | git update-index --index-info &&
setup_conflicting_index &&
echo "none of the above" >sample &&
echo ourside >expect &&
cat sample >fild &&
@ -470,4 +434,48 @@ test_expect_success 'checkout with --merge, in diff3 -m style' '
test_cmp merged file
'
test_expect_success 'checkout --conflict=merge, overriding config' '
git config merge.conflictstyle diff3 &&
setup_conflicting_index &&
echo "none of the above" >sample &&
echo ourside >expect &&
cat sample >fild &&
cat sample >file &&
cat sample >filf &&
git checkout --conflict=merge -- fild file filf &&
(
echo "<<<<<<< ours"
echo ourside
echo "======="
echo theirside
echo ">>>>>>> theirs"
) >merged &&
test_cmp expect fild &&
test_cmp expect filf &&
test_cmp merged file
'
test_expect_success 'checkout --conflict=diff3' '
git config --unset merge.conflictstyle
setup_conflicting_index &&
echo "none of the above" >sample &&
echo ourside >expect &&
cat sample >fild &&
cat sample >file &&
cat sample >filf &&
git checkout --conflict=diff3 -- fild file filf &&
(
echo "<<<<<<< ours"
echo ourside
echo "|||||||"
echo original
echo "======="
echo theirside
echo ">>>>>>> theirs"
) >merged &&
test_cmp expect fild &&
test_cmp expect filf &&
test_cmp merged file
'
test_done