Add example code for listing tags

1 files changed, 43 insertions, 0 deletions

diff --git a/_examples/tag/main.go b/_examples/tag/main.go
new file mode 100644
index 0000000..190c3ad
--- /dev/null
+++ b/_examples/tag/main.go
@@ -0,0 +1,43 @@
+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"
+	"gopkg.in/src-d/go-git.v4/plumbing/object"
+)
+
+// Basic example of how to list tags.
+func main() {
+	CheckArgs("<path>")
+	path := os.Args[1]
+
+	// We instance a new repository targeting the given path (the .git folder)
+	r, err := git.PlainOpen(path)
+	CheckIfError(err)
+
+	// List all tag references, both lightweight tags and annotated tags
+	Info("git show-ref --tag")
+
+	tagrefs, err := r.Tags()
+	CheckIfError(err)
+	err = tagrefs.ForEach(func(t *plumbing.Reference) error {
+		fmt.Println(t)
+		return nil
+	})
+	CheckIfError(err)
+
+	// Print each annotated tag object (lightweight tags are not included)
+	Info("for t in $(git show-ref --tag); do if [ \"$(git cat-file -t $t)\" = \"tag\" ]; then git cat-file -p $t ; fi; done")
+
+	tags, err := r.TagObjects()
+	CheckIfError(err)
+	err = tags.ForEach(func(t *object.Tag) error {
+		fmt.Println(t)
+		return nil
+	})
+	CheckIfError(err)
+}