ternary filter

docsite/rst/playbooks_variables.rst

@@ -304,13 +304,17 @@ Get a random number from 1 to 100 but in steps of 10::
 Other Useful Filters
 --------------------
 
+To use one value on true and another on false::
+
+   {{ name == "John" | ternary('Mr','Ms') }}
+
 To concatenate a list into a string::
-   
+
    {{ list | join(" ") }}
 
 To get the last name of a file path, like 'foo.txt' out of '/etc/asdf/foo.txt'::
 
-    {{ path | basename }} 
+    {{ path | basename }}
 
 To get the directory from a path::
 

lib/ansible/runner/filter_plugins/core.py

@@ -146,6 +146,13 @@ def regex_replace(value='', pattern='', replacement='', ignorecase=False):
     _re = re.compile(pattern, flags=flags)
     return _re.sub(replacement, value)
 
+def ternary(value, true_val, false_val):
+    '''  value ? true_val : false_val '''
+    if value:
+        return true_val
+    else:
+        return false_val
+
 def unique(a):
     if isinstance(a,collections.Hashable):
         c = set(a)
@@ -293,6 +300,9 @@ class FilterModule(object):
             'regex': regex,
             'regex_replace': regex_replace,
 
+            # ? : ;
+            'ternary': ternary,
+
             # list
             'unique' : unique,
             'intersect': intersect,