add support for pyang (#282)

Hi, 


pyang (https://github.com/mbj4668/pyang) is a YANG validator,
transformator and code generator, written in python. YANG (RFC 7950) is
a data modeling language for NETCONF (RFC 6241), developed by the IETF
NETMOD WG. This formatter provides support for Emacs yang-mode.

---------

Co-authored-by: Radon Rosborough <radon@intuitiveexplanations.com>

3 files changed, 23 insertions, 0 deletions

diff --git a/test/formatters/installers/pyang.bash b/test/formatters/installers/pyang.bash
new file mode 100644
index 0000000..0eb7edb
--- /dev/null
+++ b/test/formatters/installers/pyang.bash
@@ -0,0 +1,2 @@
+apt-get install -y python3-pip
+pip install pyang
diff --git a/test/formatters/samplecode/pyang/in.yang b/test/formatters/samplecode/pyang/in.yang
new file mode 100644
index 0000000..8b053df
--- /dev/null
+++ b/test/formatters/samplecode/pyang/in.yang
@@ -0,0 +1,10 @@
+module in { namespace "http://com/in/in";
+  prefix 
+    in       ;
+
+  list example { key "name";
+    leaf name {
+type string;   
+}
+          }  
+}
diff --git a/test/formatters/samplecode/pyang/out.yang b/test/formatters/samplecode/pyang/out.yang
new file mode 100644
index 0000000..3d5a143
--- /dev/null
+++ b/test/formatters/samplecode/pyang/out.yang
@@ -0,0 +1,11 @@
+module in {
+  namespace "http://com/in/in";
+  prefix in;
+
+  list example {
+    key "name";
+    leaf name {
+      type string;
+    }
+  }
+}