Vendor dependencies with vndr

This fixes issue #123

1 files changed, 93 insertions, 0 deletions

diff --git a/vendor/github.com/hashicorp/terraform/terraform/util.go b/vendor/github.com/hashicorp/terraform/terraform/util.go
new file mode 100644
index 00000000..f41f0d7d
--- /dev/null
+++ b/vendor/github.com/hashicorp/terraform/terraform/util.go
@@ -0,0 +1,93 @@
+package terraform
+
+import (
+	"sort"
+	"strings"
+)
+
+// Semaphore is a wrapper around a channel to provide
+// utility methods to clarify that we are treating the
+// channel as a semaphore
+type Semaphore chan struct{}
+
+// NewSemaphore creates a semaphore that allows up
+// to a given limit of simultaneous acquisitions
+func NewSemaphore(n int) Semaphore {
+	if n == 0 {
+		panic("semaphore with limit 0")
+	}
+	ch := make(chan struct{}, n)
+	return Semaphore(ch)
+}
+
+// Acquire is used to acquire an available slot.
+// Blocks until available.
+func (s Semaphore) Acquire() {
+	s <- struct{}{}
+}
+
+// TryAcquire is used to do a non-blocking acquire.
+// Returns a bool indicating success
+func (s Semaphore) TryAcquire() bool {
+	select {
+	case s <- struct{}{}:
+		return true
+	default:
+		return false
+	}
+}
+
+// Release is used to return a slot. Acquire must
+// be called as a pre-condition.
+func (s Semaphore) Release() {
+	select {
+	case <-s:
+	default:
+		panic("release without an acquire")
+	}
+}
+
+// resourceProvider returns the provider name for the given type.
+func resourceProvider(t, alias string) string {
+	if alias != "" {
+		return alias
+	}
+
+	idx := strings.IndexRune(t, '_')
+	if idx == -1 {
+		// If no underscores, the resource name is assumed to be
+		// also the provider name, e.g. if the provider exposes
+		// only a single resource of each type.
+		return t
+	}
+
+	return t[:idx]
+}
+
+// strSliceContains checks if a given string is contained in a slice
+// When anybody asks why Go needs generics, here you go.
+func strSliceContains(haystack []string, needle string) bool {
+	for _, s := range haystack {
+		if s == needle {
+			return true
+		}
+	}
+	return false
+}
+
+// deduplicate a slice of strings
+func uniqueStrings(s []string) []string {
+	if len(s) < 2 {
+		return s
+	}
+
+	sort.Strings(s)
+	result := make([]string, 1, len(s))
+	result[0] = s[0]
+	for i := 1; i < len(s); i++ {
+		if s[i] != result[len(result)-1] {
+			result = append(result, s[i])
+		}
+	}
+	return result
+}