1 files changed, 47 insertions, 0 deletions
diff --git a/hostinfo/prefix.py b/hostinfo/prefix.py
new file mode 100644
index 0000000..e9f0bf2
--- /dev/null
+++ b/hostinfo/prefix.py
@@ -0,0 +1,47 @@
+# -*- coding: utf-8 -*-
+
+from __future__ import print_function
+
+class Printer:
+    flags = list()
+
+    def __init__(self, full_key='', printer=None):
+        if printer is None:
+            self.output = print
+        else:
+            self.output = printer.pprint
+
+        self.parent = printer
+        self.empty = 'oneline' in self.__class__.flags
+        self.full_key = full_key
+        self.has_output = False
+        self.label = ''
+
+    def set_label(self, label='', maxlength=0):
+        self.label = self._get_label(label, maxlength)
+
+    def _get_label(self, label, maxlength):
+        if label == '':
+            return label
+
+        label = "%s: " % label
+        if self.parent is not None and self.parent.full_key == '':
+            if 'nospaces' in self.__class__.flags:
+                return label.rjust(maxlength+4)
+            else:
+                return (label + "  ").rjust(maxlength+6)
+        else:
+            return label.ljust(maxlength+2)
+
+    def pprint(self, data):
+        self.output("%s%s" % (self.label, data))
+        self.has_output = True
+        if not self.empty:
+            self.label = ' ' * len(self.label)
+            self.empty = True
+
+    def space(self, force=False):
+        if 'nospaces' not in self.__class__.flags:
+            if self.has_output or force:
+                self.output('')
+