Add tests for PushRule.Match and fork glob to make it compatible with the spec

lib/glob/LICENSE

@@ -0,0 +1,22 @@
+Glob is licensed under the MIT "Expat" License:
+
+Copyright (c) 2016: Zachary Yedidia.
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

lib/glob/README.md

@@ -0,0 +1,28 @@
+# String globbing in Go
+
+[![GoDoc](https://godoc.org/github.com/zyedidia/glob?status.svg)](http://godoc.org/github.com/zyedidia/glob)
+
+This package adds support for globs in Go.
+
+It simply converts glob expressions to regexps. I try to follow the standard defined [here](http://pubs.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_13).
+
+# Example
+
+```go
+package main
+
+import "github.com/zyedidia/glob"
+
+func main() {
+    glob, err := glob.Compile("{*.go,*.c}")
+    if err != nil {
+        // Error
+    }
+
+    glob.Match([]byte("test.c"))   // true
+    glob.Match([]byte("hello.go")) // true
+    glob.Match([]byte("test.d"))   // false
+}
+```
+
+You can call all the same functions on a glob that you can call on a regexp.

lib/glob/glob.go

@@ -0,0 +1,108 @@
+// Package glob provides objects for matching strings with globs
+package glob
+
+import "regexp"
+
+// Glob is a wrapper of *regexp.Regexp.
+// It should contain a glob expression compiled into a regular expression.
+type Glob struct {
+	*regexp.Regexp
+}
+
+// Compile a takes a glob expression as a string and transforms it
+// into a *Glob object (which is really just a regular expression)
+// Compile also returns a possible error.
+func Compile(pattern string) (*Glob, error) {
+	r, err := globToRegex(pattern)
+	return &Glob{r}, err
+}
+
+func globToRegex(glob string) (*regexp.Regexp, error) {
+	regex := ""
+	inGroup := 0
+	inClass := 0
+	firstIndexInClass := -1
+	arr := []byte(glob)
+
+	hasGlobCharacters := false
+
+	for i := 0; i < len(arr); i++ {
+		ch := arr[i]
+
+		switch ch {
+		case '\\':
+			i++
+			if i >= len(arr) {
+				regex += "\\"
+			} else {
+				next := arr[i]
+				switch next {
+				case ',':
+					// Nothing
+				case 'Q', 'E':
+					regex += "\\\\"
+				default:
+					regex += "\\"
+				}
+				regex += string(next)
+			}
+		case '*':
+			if inClass == 0 {
+				regex += ".*"
+			} else {
+				regex += "*"
+			}
+			hasGlobCharacters = true
+		case '?':
+			if inClass == 0 {
+				regex += "."
+			} else {
+				regex += "?"
+			}
+			hasGlobCharacters = true
+		case '[':
+			inClass++
+			firstIndexInClass = i + 1
+			regex += "["
+			hasGlobCharacters = true
+		case ']':
+			inClass--
+			regex += "]"
+		case '.', '(', ')', '+', '|', '^', '$', '@', '%':
+			if inClass == 0 || (firstIndexInClass == i && ch == '^') {
+				regex += "\\"
+			}
+			regex += string(ch)
+			hasGlobCharacters = true
+		case '!':
+			if firstIndexInClass == i {
+				regex += "^"
+			} else {
+				regex += "!"
+			}
+			hasGlobCharacters = true
+		case '{':
+			inGroup++
+			regex += "("
+			hasGlobCharacters = true
+		case '}':
+			inGroup--
+			regex += ")"
+		case ',':
+			if inGroup > 0 {
+				regex += "|"
+				hasGlobCharacters = true
+			} else {
+				regex += ","
+			}
+		default:
+			regex += string(ch)
+		}
+	}
+
+	if hasGlobCharacters {
+		return regexp.Compile("^" + regex + "$")
+	} else {
+		return regexp.Compile(regex)
+	}
+}