Fix revision solver for branch and tag (#660)

fix Repository.ResolveRevision for branch and tag

1 files changed, 32 insertions, 0 deletions

diff --git a/_examples/revision/main.go b/_examples/revision/main.go
new file mode 100644
index 0000000..a2389bd
--- /dev/null
+++ b/_examples/revision/main.go
@@ -0,0 +1,32 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"gopkg.in/src-d/go-git.v4"
+	. "gopkg.in/src-d/go-git.v4/_examples"
+	"gopkg.in/src-d/go-git.v4/plumbing"
+)
+
+// Example how to resolve a revision into its commit counterpart
+func main() {
+	CheckArgs("<path>", "<revision>")
+
+	path := os.Args[1]
+	revision := os.Args[2]
+
+	// We instantiate a new repository targeting the given path (the .git folder)
+	r, err := git.PlainOpen(path)
+	CheckIfError(err)
+
+	// Resolve revision into a sha1 commit, only some revisions are resolved
+	// look at the doc to get more details
+	Info("git rev-parse %s", revision)
+
+	h, err := r.ResolveRevision(plumbing.Revision(revision))
+
+	CheckIfError(err)
+
+	fmt.Println(h.String())
+}