merge-file: add option to specify the marker size

This adds the abbility to specify the conflict marker size for merges outside
a git repository.

Signed-off-by: Bert Wesarg <bert.wesarg@googlemail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-merge-file.txt

@@ -10,7 +10,7 @@ SYNOPSIS
 --------
 [verse]
 'git merge-file' [-L <current-name> [-L <base-name> [-L <other-name>]]]
-	[--ours|--theirs] [-p|--stdout] [-q|--quiet]
+	[--ours|--theirs] [-p|--stdout] [-q|--quiet] [--marker-size=<n>]
 	<current-file> <base-file> <other-file>
 
 
@@ -37,7 +37,8 @@ normally outputs a warning and brackets the conflict with lines containing
 If there are conflicts, the user should edit the result and delete one of
 the alternatives.  When `--ours` or `--theirs` option is in effect, however,
 these conflicts are resolved favouring lines from `<current-file>` or
-lines from `<other-file>` respectively.
+lines from `<other-file>` respectively.  The length of the conflict markers
+can be given with the `--marker-size` option.
 
 The exit value of this program is negative on error, and the number of
 conflicts otherwise. If the merge was clean, the exit value is 0.

builtin-merge-file.c

@@ -36,6 +36,8 @@ int cmd_merge_file(int argc, const char **argv, const char *prefix)
 			    XDL_MERGE_FAVOR_OURS),
 		OPT_SET_INT(0, "theirs", &xmp.favor, "for conflicts, use their version",
 			    XDL_MERGE_FAVOR_THEIRS),
+		OPT_INTEGER(0, "marker-size", &xmp.marker_size,
+			    "for conflicts, use this marker size"),
 		OPT__QUIET(&quiet),
 		OPT_CALLBACK('L', NULL, names, "name",
 			     "set labels for file1/orig_file/file2", &label_cb),

t/t6023-merge-file.sh

@@ -211,4 +211,41 @@ test_expect_success '"diff3 -m" style output (2)' '
 	test_cmp expect actual
 '
 
+cat >expect <<\EOF
+Dominus regit me,
+<<<<<<<<<< new8.txt
+et nihil mihi deerit;
+
+
+
+
+In loco pascuae ibi me collocavit;
+super aquam refectionis educavit me.
+||||||||||
+et nihil mihi deerit.
+In loco pascuae ibi me collocavit,
+super aquam refectionis educavit me;
+==========
+et nihil mihi deerit,
+
+
+
+
+In loco pascuae ibi me collocavit --
+super aquam refectionis educavit me,
+>>>>>>>>>> new9.txt
+animam meam convertit,
+deduxit me super semitas jusitiae,
+propter nomen suum.
+Nam et si ambulavero in medio umbrae mortis,
+non timebo mala, quoniam TU mecum es:
+virga tua et baculus tuus ipsa me consolata sunt.
+EOF
+
+test_expect_success 'marker size' '
+	test_must_fail git merge-file -p --marker-size=10 \
+		new8.txt new5.txt new9.txt >actual &&
+	test_cmp expect actual
+'
+
 test_done