Merge branch 'nd/wildmatch-double-asterisk'

A pattern with '**' that does not have a slash on either side used
to be an invalid one, but the code now treats such double-asterisks
the same way as two normal asterisks that happen to be adjacent to
each other.

* nd/wildmatch-double-asterisk:
  wildmatch: change behavior of "foo**bar" in WM_PATHNAME mode

Author: gitster

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
 -----

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'

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;

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