Ignore patterns should be case insensitive on OS X and Windows

fnmatch/fnmatch.go

@@ -20,15 +20,22 @@ const (
 func Convert(pattern string, flags int) (*regexp.Regexp, error) {
 	any := "."
 
-	if runtime.GOOS == "windows" {
-		flags |= FNM_NOESCAPE
+	switch runtime.GOOS {
+	case "windows":
+		flags |= FNM_NOESCAPE | FNM_CASEFOLD
 		pattern = filepath.FromSlash(pattern)
 		if flags&FNM_PATHNAME != 0 {
 			any = "[^\\\\]"
 		}
-	} else if flags&FNM_PATHNAME != 0 {
-		any = "[^/]"
+	case "darwin":
+		flags |= FNM_CASEFOLD
+		fallthrough
+	default:
+		if flags&FNM_PATHNAME != 0 {
+			any = "[^/]"
+		}
 	}
+
 	if flags&FNM_NOESCAPE != 0 {
 		pattern = strings.Replace(pattern, "\\", "\\\\", -1)
 	} else {

fnmatch/fnmatch_test.go

@@ -50,12 +50,17 @@ var testcases = []testcase{
 	{"**/foo.txt", "bar/baz/foo.txt", 0, true},
 	{"**/foo.txt", "bar/baz/foo.txt", FNM_PATHNAME, true},
 
-	{"foo.txt", "foo.TXT", 0, false},
 	{"foo.txt", "foo.TXT", FNM_CASEFOLD, true},
 }
 
 func TestMatch(t *testing.T) {
-	if runtime.GOOS != "windows" {
+	switch runtime.GOOS {
+	case "windows":
+		testcases = append(testcases, testcase{"foo.txt", "foo.TXT", 0, true})
+	case "darwin":
+		testcases = append(testcases, testcase{"foo.txt", "foo.TXT", 0, true})
+		fallthrough
+	default:
 		testcases = append(testcases, testcase{"f\\[ab\\]o.txt", "f[ab]o.txt", 0, true})
 		testcases = append(testcases, testcase{"foo\\.txt", "foo.txt", 0, true})
 		testcases = append(testcases, testcase{"foo\\*.txt", "foo*.txt", 0, true})

ignore/ignore_test.go

@@ -7,6 +7,7 @@ package ignore_test
 import (
 	"bytes"
 	"path/filepath"
+	"runtime"
 	"testing"
 
 	"github.com/syncthing/syncthing/ignore"
@@ -106,3 +107,29 @@ func TestBadPatterns(t *testing.T) {
 		}
 	}
 }
+
+func TestCaseSensitivity(t *testing.T) {
+	ign, _ := ignore.Parse(bytes.NewBufferString("test"), ".stignore")
+
+	match := []string{"test"}
+	dontMatch := []string{"foo"}
+
+	switch runtime.GOOS {
+	case "darwin", "windows":
+		match = append(match, "TEST", "Test", "tESt")
+	default:
+		dontMatch = append(dontMatch, "TEST", "Test", "tESt")
+	}
+
+	for _, tc := range match {
+		if !ign.Match(tc) {
+			t.Errorf("Incorrect match for %q: should be matched", tc)
+		}
+	}
+
+	for _, tc := range dontMatch {
+		if ign.Match(tc) {
+			t.Errorf("Incorrect match for %q: should not be matched", tc)
+		}
+	}
+}