1 files changed, 62 insertions, 0 deletions
diff --git a/domainname.go b/domainname.go
new file mode 100644
index 0000000..ae49670
--- /dev/null
+++ b/domainname.go
@@ -0,0 +1,62 @@
+package hostname
+
+import (
+	"fmt"
+	"strings"
+)
+
+// for www.corp.wit.com retuns:
+// "www", "corp.wit.com", nil
+func GetDomainname() (string, string, error) {
+	hname, err := osGetHostname()
+	if err != nil {
+		return hname, "", err
+	}
+	hname = strings.TrimSpace(hname)
+	hname = strings.Trim(hname, ".")
+	parts := strings.Split(hname, ".")
+	if len(parts) == 0 {
+		return "", "", fmt.Errorf("domainname not set")
+	}
+
+	if len(parts) == 1 {
+		return parts[0], "", fmt.Errorf("domainname not set")
+	}
+
+	dname := strings.Join(parts[1:], ".")
+
+	return hname, dname, nil
+}
+
+// splits hostname into first and last part
+// for www.corp.wit.com retuns:
+// "www", "corp.wit.com", nil
+func Split(hname string) (string, string, error) {
+	hname = strings.TrimSpace(hname)
+	hname = strings.Trim(hname, ".")
+	parts := strings.Split(hname, ".")
+	if len(parts) == 0 {
+		return "", "", fmt.Errorf("domainname not set")
+	}
+
+	if len(parts) == 1 {
+		return parts[0], "", fmt.Errorf("domainname not set")
+	}
+
+	dname := strings.Join(parts[1:], ".")
+
+	return hname, dname, nil
+}
+
+func Join(hname string, dname string) string {
+	hname = strings.TrimSpace(hname)
+	hname = strings.Trim(hname, ".")
+	dname = strings.TrimSpace(dname)
+	dname = strings.Trim(dname, ".")
+
+	fullname := strings.Join([]string{hname, dname}, ".")
+	fullname = strings.TrimSpace(fullname)
+	fullname = strings.Trim(fullname, ".")
+
+	return fullname
+}