1 files changed, 36 insertions, 0 deletions
diff --git a/lib/shared.go b/lib/shared.go
new file mode 100644
index 0000000..215ce7a
--- /dev/null
+++ b/lib/shared.go
@@ -0,0 +1,36 @@
+package mkvlib
+
+import (
+	"log"
+	"os/exec"
+)
+
+const libName = "mkvlib"
+const libVer = "1.0.0"
+
+const LibFName = libName + " " + libVer
+
+var _instance *mkvProcessor
+
+func GetInstance() *mkvProcessor {
+	ec := 0
+	_, _ttx := exec.LookPath(ttx)
+	_, _pyftsubset := exec.LookPath(pyftsubset)
+	_, _mkvextract := exec.LookPath(mkvextract)
+	_, _mkvmerge := exec.LookPath(mkvmerge)
+	if _ttx != nil || _pyftsubset != nil {
+		log.Printf(`Missing dependency: fonttools (need "%s" & "%s").`, ttx, pyftsubset)
+		ec++
+	}
+	if _mkvextract != nil || _mkvmerge != nil {
+		log.Printf(`Missing dependency: mkvtoolnix (need "%s" & "%s").`, mkvextract, mkvmerge)
+		ec++
+	}
+	if ec > 0 {
+		return nil
+	}
+	if _instance == nil {
+		_instance = new(mkvProcessor)
+	}
+	return _instance
+}