documentation for source code filters

doc/manual.txt

@@ -1529,6 +1529,7 @@ Example:
     finally:
       close(f)
 
+
 The statements after the `try`:idx: are executed in sequential order unless
 an exception ``e`` is raised. If the exception type of ``e`` matches any
 of the list ``exceptlist`` the corresponding statements are executed.
@@ -2324,6 +2325,7 @@ invoked by an expression following a colon::
 The following example outlines a macro that generates a lexical analyzer from
 regular expressions:
 
+
 .. code-block:: nimrod
   import macros
 
@@ -2651,30 +2653,30 @@ Example:
 
 .. code-block:: nimrod
   {.deadCodeElim: on.}
-
-
-Pragma pragma
--------------
-
-The `pragma`:idx: pragma can be used to declare user defined pragmas. This is 
-useful because Nimrod's templates and macros do not affect pragmas. User 
-defined pragmas are in a different module-wide scope than all other symbols. 
-They cannot be imported from a module.
-
-Example:
-
-.. code-block:: nimrod
-  when appType == "lib":
-    {.pragma: rtl, exportc, dynlib, cdecl.}
-  else:
-    {.pragma: rtl, importc, dynlib: "client.dll", cdecl.}
-    
-  proc p*(a, b: int): int {.rtl.} = 
-    return a+b
-
-In the example a new pragma named ``rtl`` is introduced that either imports
-a symbol from a dynamic library or exports the symbol for dynamic library
-generation.
+
+
+Pragma pragma
+-------------
+
+The `pragma`:idx: pragma can be used to declare user defined pragmas. This is 
+useful because Nimrod's templates and macros do not affect pragmas. User 
+defined pragmas are in a different module-wide scope than all other symbols. 
+They cannot be imported from a module.
+
+Example:
+
+.. code-block:: nimrod
+  when appType == "lib":
+    {.pragma: rtl, exportc, dynlib, cdecl.}
+  else:
+    {.pragma: rtl, importc, dynlib: "client.dll", cdecl.}
+    
+  proc p*(a, b: int): int {.rtl.} = 
+    return a+b
+
+In the example a new pragma named ``rtl`` is introduced that either imports
+a symbol from a dynamic library or exports the symbol for dynamic library
+generation.
 
 
 Disabling certain messages
@@ -2786,17 +2788,18 @@ string expressions in general:
 
 **Note**: Patterns like ``libtcl(|8.5|8.4).so`` are only supported in constant
 strings, because they are precompiled.
-
+
 Dynlib pragma for export
-------------------------
-
+------------------------
+
 With the ``dynlib`` pragma a procedure can also be exported to
-a dynamic library. The pragma then has no argument and has to be used in
+a dynamic library. The pragma then has no argument and has to be used in
 conjunction with the ``exportc`` pragma:
 
 .. code-block:: Nimrod
   proc exportme(): int {.cdecl, exportc, dynlib.}
-
-This is only useful if the program is compiled as a dynamic library via the
-``--app:lib`` command line option.
-
+
+This is only useful if the program is compiled as a dynamic library via the
+``--app:lib`` command line option.
+
+