add vendor dependencies

1 files changed, 44 insertions, 0 deletions

diff --git a/vendor/github.com/Xe/ln/stack.go b/vendor/github.com/Xe/ln/stack.go
new file mode 100644
index 0000000..1cf1e7a
--- /dev/null
+++ b/vendor/github.com/Xe/ln/stack.go
@@ -0,0 +1,44 @@
+package ln
+
+import (
+	"os"
+	"runtime"
+	"strings"
+)
+
+type frame struct {
+	filename string
+	function string
+	lineno   int
+}
+
+// skips 2 frames, since Caller returns the current frame, and we need
+// the caller's caller.
+func callersFrame() frame {
+	var out frame
+	pc, file, line, ok := runtime.Caller(3)
+	if !ok {
+		return out
+	}
+	srcLoc := strings.LastIndex(file, "/src/")
+	if srcLoc >= 0 {
+		file = file[srcLoc+5:]
+	}
+	out.filename = file
+	out.function = functionName(pc)
+	out.lineno = line
+
+	return out
+}
+
+func functionName(pc uintptr) string {
+	fn := runtime.FuncForPC(pc)
+	if fn == nil {
+		return "???"
+	}
+	name := fn.Name()
+	beg := strings.LastIndex(name, string(os.PathSeparator))
+	return name[beg+1:]
+	//	end := strings.LastIndex(name, string(os.PathSeparator))
+	//	return name[end+1 : len(name)]
+}