Merge branch 'tmpl_function_eval'

Conflicts: doc/templates.md
tsufeki · Jul 18, 2013 · c9acf49 · c9acf49
2 parents 3d446f7 + 5caf4fc
commit c9acf49
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diff --git a/doc/templates.md b/doc/templates.md
@@ -131,3 +131,10 @@ Operations on variables
     if it's empty or non-existing.
 - `$set(name,value)`: set `%name%` to `value`.
 - `$unset(name)`: unset `%name%`.
+
+`$python()`
+-----------
+
+- `$python(expr,imports)`: evaluate an arbitrary python expression `expr`.
+    `imports` is a space-separated list of modules to import (can be omitted).
+
diff --git a/qygmy/templates/functions.py b/qygmy/templates/functions.py
@@ -127,3 +127,11 @@ def context_time(ctx, seconds):
     else:
         return ctx['__timefmt__'][2].format(sign, m, s)
 
+def context_python(ctx, expression, imports=''):
+    modules = {'__builtins__': __builtins__}
+    if imports:
+        for m in imports.split():
+            topname = m.split('.', 1)[0]
+            modules[topname] = __import__(m)
+    return str(eval(expression, modules, ctx))
+