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diff-parseopt: restore -U (no argument) behavior

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Before d473e2e0e8 (diff.c: convert -U|--unified, 2019-01-27), -U and
--unified are implemented with a custom parser opt_arg() in diff.c. I
didn't check this code carefully and not realize that it's the
equivalent of PARSE_OPT_NONEG | PARSE_OPT_OPTARG.

In other words, if -U is specified without any argument, the option
should be accepted, and the default value should be used. Without
PARSE_OPT_OPTARG, parse_options() will reject this case and cause a
regression.

Reported-by: Bryan Turner <bturner@atlassian.com>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Nguyễn Thái Ngọc Duy 2019-05-29 16:11:15 +07:00 committed by Junio C Hamano
parent 7f125ff909
commit 8ef05193bc
5 changed files with 100 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
diff.c
View File

@ -4875,9 +4875,11 @@ static int diff_opt_unified(const struct option *opt,
BUG_ON_OPT_NEG(unset);
options->context = strtol(arg, &s, 10);
if (*s)
return error(_("%s expects a numerical value"), "--unified");
if (arg) {
options->context = strtol(arg, &s, 10);
if (*s)
return error(_("%s expects a numerical value"), "--unified");
}
enable_patch_output(&options->output_format);
return 0;
@ -4895,7 +4897,7 @@ static void prep_parse_options(struct diff_options *options)
DIFF_FORMAT_PATCH, DIFF_FORMAT_NO_OUTPUT),
OPT_CALLBACK_F('U', "unified", options, N_("<n>"),
N_("generate diffs with <n> lines context"),
PARSE_OPT_NONEG, diff_opt_unified),
PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_unified),
OPT_BOOL('W', "function-context", &options->flags.funccontext,
N_("generate diffs with <n> lines context")),
OPT_BIT_F(0, "raw", &options->output_format,

2
t/t4013-diff-various.sh
View File

@ -330,6 +330,8 @@ format-patch --inline --stdout initial..master^^
format-patch --stdout --cover-letter -n initial..master^
diff --abbrev initial..side
diff -U initial..side
diff -U1 initial..side
diff -r initial..side
diff --stat initial..side
diff -r --stat initial..side

29
t/t4013/diff.diff_-U1_initial..side Normal file
View File

@ -0,0 +1,29 @@
$ git diff -U1 initial..side
diff --git a/dir/sub b/dir/sub
index 35d242b..7289e35 100644
--- a/dir/sub
+++ b/dir/sub
@@ -2 +2,3 @@ A
B
+1
+2
diff --git a/file0 b/file0
index 01e79c3..f4615da 100644
--- a/file0
+++ b/file0
@@ -3 +3,4 @@
3
+A
+B
+C
diff --git a/file3 b/file3
new file mode 100644
index 0000000..7289e35
--- /dev/null
+++ b/file3
@@ -0,0 +1,4 @@
+A
+B
+1
+2
$

31
t/t4013/diff.diff_-U2_initial..side Normal file
View File

@ -0,0 +1,31 @@
$ git diff -U2 initial..side
diff --git a/dir/sub b/dir/sub
index 35d242b..7289e35 100644
--- a/dir/sub
+++ b/dir/sub
@@ -1,2 +1,4 @@
A
B
+1
+2
diff --git a/file0 b/file0
index 01e79c3..f4615da 100644
--- a/file0
+++ b/file0
@@ -2,2 +2,5 @@
2
3
+A
+B
+C
diff --git a/file3 b/file3
new file mode 100644
index 0000000..7289e35
--- /dev/null
+++ b/file3
@@ -0,0 +1,4 @@
+A
+B
+1
+2
$

32
t/t4013/diff.diff_-U_initial..side Normal file
View File

@ -0,0 +1,32 @@
$ git diff -U initial..side
diff --git a/dir/sub b/dir/sub
index 35d242b..7289e35 100644
--- a/dir/sub
+++ b/dir/sub
@@ -1,2 +1,4 @@
A
B
+1
+2
diff --git a/file0 b/file0
index 01e79c3..f4615da 100644
--- a/file0
+++ b/file0
@@ -1,3 +1,6 @@
1
2
3
+A
+B
+C
diff --git a/file3 b/file3
new file mode 100644
index 0000000..7289e35
--- /dev/null
+++ b/file3
@@ -0,0 +1,4 @@
+A
+B
+1
+2
$