[PATCH] wildmatch: change behavior of "foo**bar" in WM_PATHNAME mode

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

In WM_PATHNAME mode (or FNM_PATHNAME), '*' does not match '/' and '**'
can but only in three patterns:

- '**/' matches zero or more leading directories
- '/**/' matches zero or more directories in between
- '/**' matches zero or more trailing directories/files

When '**' is present but not in one of these patterns, the current
behavior is consider the pattern invalid and stop matching. In other
words, 'foo**bar' never matches anything, whatever you throw at it.

This behavior is arguably a bit confusing partly because we can't
really tell the user their pattern is invalid so that they can fix
it. So instead, tolerate it and make '**' act like two regular '*'s
(which is essentially the same as a single asterisk). This behavior
seems more predictable.

Noticed-by: dana <dana@dana.is>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 Documentation/gitignore.txt | 3 ++-
 t/t3070-wildmatch.sh        | 4 ++--
 wildmatch.c                 | 4 ++--
 wildmatch.h                 | 1 -
 4 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/Documentation/gitignore.txt b/Documentation/gitignore.txt
index d107daaffd..1c94f08ff4 100644
--- a/Documentation/gitignore.txt
+++ b/Documentation/gitignore.txt
@@ -129,7 +129,8 @@ full pathname may have special meaning:
    matches zero or more directories. For example, "`a/**/b`"
    matches "`a/b`", "`a/x/b`", "`a/x/y/b`" and so on.
 
- - Other consecutive asterisks are considered invalid.
+ - Other consecutive asterisks are considered regular asterisks and
+   will match according to the previous rules.
 
 NOTES
 -----
diff --git a/t/t3070-wildmatch.sh b/t/t3070-wildmatch.sh
index 46aca0af10..891d4d7cb9 100755
--- a/t/t3070-wildmatch.sh
+++ b/t/t3070-wildmatch.sh
@@ -237,7 +237,7 @@ match 0 0 0 0 foobar 'foo\*bar'
 match 1 1 1 1 'f\oo' 'f\\oo'
 match 1 1 1 1 ball '*[al]?'
 match 0 0 0 0 ten '[ten]'
-match 0 0 1 1 ten '**[!te]'
+match 1 1 1 1 ten '**[!te]'
 match 0 0 0 0 ten '**[!ten]'
 match 1 1 1 1 ten 't[a-g]n'
 match 0 0 0 0 ten 't[!a-g]n'
@@ -253,7 +253,7 @@ match 1 1 1 1 ']' ']'
 # Extended slash-matching features
 match 0 0 1 1 'foo/baz/bar' 'foo*bar'
 match 0 0 1 1 'foo/baz/bar' 'foo**bar'
-match 0 0 1 1 'foobazbar' 'foo**bar'
+match 1 1 1 1 'foobazbar' 'foo**bar'
 match 1 1 1 1 'foo/baz/bar' 'foo/**/bar'
 match 1 1 0 0 'foo/baz/bar' 'foo/**/**/bar'
 match 1 1 1 1 'foo/b/a/z/bar' 'foo/**/bar'
diff --git a/wildmatch.c b/wildmatch.c
index d074c1be10..9e9e2a2f95 100644
--- a/wildmatch.c
+++ b/wildmatch.c
@@ -104,8 +104,8 @@ static int dowild(const uchar *p, const uchar *text, unsigned int flags)
 					    dowild(p + 1, text, flags) == WM_MATCH)
 						return WM_MATCH;
 					match_slash = 1;
-				} else
-					return WM_ABORT_MALFORMED;
+				} else /* WM_PATHNAME is set */
+					match_slash = 0;
 			} else
 				/* without WM_PATHNAME, '*' == '**' */
 				match_slash = flags & WM_PATHNAME ? 0 : 1;
diff --git a/wildmatch.h b/wildmatch.h
index b8c826aa68..5993696298 100644
--- a/wildmatch.h
+++ b/wildmatch.h
@@ -4,7 +4,6 @@
 #define WM_CASEFOLD 1
 #define WM_PATHNAME 2
 
-#define WM_ABORT_MALFORMED 2
 #define WM_NOMATCH 1
 #define WM_MATCH 0
 #define WM_ABORT_ALL -1
-- 
2.19.1.647.g708186aaf9