Added bool_lax{} expansion operator, which uses Router condition logic to

[exim.git] / doc / doc-docbook / spec.xfpt

diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index dd8db236733e8bcec2c471ad6290df5452516504..8254bee5163c7fbd9f59c9c0baf7dedffd581d02 100644 (file)
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -1,4 +1,4 @@
-. $Cambridge: exim/doc/doc-docbook/spec.xfpt,v 1.83 2010/06/07 07:09:10 pdp Exp $
+. $Cambridge: exim/doc/doc-docbook/spec.xfpt,v 1.84 2010/06/07 08:23:20 pdp Exp $
 .
 . /////////////////////////////////////////////////////////////////////////////
 . This is the primary source of the Exim Manual. It is an xfpt document that is
@@ -9812,6 +9812,17 @@ For example:
 ${if bool{$acl_m_privileged_sender} ...
 .endd
 
+.vitem &*bool_lax&~{*&<&'string'&>&*}*&
+.cindex "expansion" "boolean parsing"
+.cindex "&%bool_lax%& expansion condition"
+Like &%bool%&, this condition turns a string into a boolean state.  But
+where &%bool%& accepts a strict set of strings, &%bool_lax%& uses the same
+loose definition that the Router &%condition%& option uses.  The empty string
+and the values &"false"&, &"no"& and &"0"& map to false, all others map to
+true.
+
+Note that where &"bool{00}"& is false, &"bool_lax{00}"& is true.
+
 .vitem &*crypteq&~{*&<&'string1'&>&*}{*&<&'string2'&>&*}*&
 .cindex "expansion" "encrypted comparison"
 .cindex "encrypted strings, comparing"
@@ -15670,10 +15681,7 @@ If the result is any other value, the router is run (as this is the last
 precondition to be evaluated, all the other preconditions must be true).
 
 This option is unique in that multiple &%condition%& options may be present.
-In this case, the previous statement does not quite apply: the result of each
-&%condition%& option must be a string recognised by the &%bool%& expansion
-operator, or failure will be forced.  The effect is to "and" the conditions
-together, as each must pass.
+All &%condition%& options must succeed.
 
 The &%condition%& option provides a means of applying custom conditions to the
 running of routers. Note that in the case of a simple conditional expansion,
@@ -15685,10 +15693,11 @@ Because of the default behaviour of the string expansion, this is equivalent to
 .code
 condition = ${if >{$message_age}{600}{true}{}}
 .endd
-A multiple condition example:
+A multiple condition example, which succeeds:
 .code
 condition = ${if >{$message_age}{600}}
 condition = ${if !eq{${lc:$local_part}}{postmaster}}
+condition = foobar
 .endd
 If the expansion fails (other than forced failure) delivery is deferred. Some
 of the other precondition options are common special cases that could in fact