Add $is_a(<name>, <target-type>), $filter[_out](<names>, <target-types>) functions

$is_a() returns true if the <name>'s target type is-a <target-type>. Note
that this is a dynamic type check that takes into account target type
inheritance.

$filter[_out]() return names with target types which are-a (filter) or
not are-a (filter_out) one of <target-types>.

In particular, these functions are useful for filtering prerequisite
targets ($<) in ad hoc recipes and rules.

1 files changed, 36 insertions, 0 deletions

diff --git a/tests/function/name/testscript b/tests/function/name/testscript
index 2fe8e24..6222167 100644
--- a/tests/function/name/testscript
+++ b/tests/function/name/testscript
@@ -3,6 +3,42 @@
 
 .include ../../common.testscript
 
+: is_a
+:
+{
+  $* <'print $is_a(file{foo},    path_target)' >'true'  : basics-true
+  $* <'print $is_a(alias{foo},   path_target)' >'false' : basics-false
+  $* <'print $is_a(file{foo}@./, path_target)' >'true'  : out
+  $* <<EOI                                     >'true'  : derived
+  define txt: file
+  print $is_a(txt{foo}, path_target)
+  EOI
+}
+
+: filter
+:
+{
+  $* <<EOI >'file{foo}@./ txt{baz}' : basics
+  define txt: file
+  print $filter(file{foo}@./ alias{bar} dir{./} txt{baz}, file)
+  EOI
+
+  $* <<EOI >'file{foo}@./ txt{baz}' : basics-out
+  define txt: file
+  print $filter_out(file{foo}@./ alias{bar} dir{./} txt{baz}, alias)
+  EOI
+
+  $* <<EOI >'file{foo}@./ dir{./} txt{baz}' : multiple
+  define txt: file
+  print $filter(file{foo}@./ alias{bar} dir{./} txt{baz}, file dir)
+  EOI
+
+  $* <<EOI >'file{foo}@./ alias{bar}' : multiple-out
+  define txt: file
+  print $filter_out(file{foo}@./ alias{bar} dir{./} txt{baz}, txt dir)
+  EOI
+}
+
 : size
 :
 {