New contains function: near alias of search.

Harmonizes with starts-with and ends-with.

* eval.c (eval_init): Register contains intrinsic.

* lib.c (contains): New function.

* lib.h (contains): Delared.

* txr.1: Documented.

1 files changed, 1 insertions, 0 deletions

diff --git a/eval.c b/eval.c
index dd2adcf4..805805b3 100644
--- a/eval.c
+++ b/eval.c
@@ -6892,6 +6892,7 @@ void eval_init(void)
   reg_fun(intern(lit("update"), user_package), func_n2(update));
   reg_fun(intern(lit("search"), user_package), func_n4o(search, 2));
   reg_fun(intern(lit("rsearch"), user_package), func_n4o(rsearch, 2));
+  reg_fun(intern(lit("contains"), user_package), func_n4o(contains, 2));
   reg_fun(intern(lit("where"), user_package), func_n2(where));
   reg_fun(intern(lit("select"), user_package), func_n2(sel));
   reg_fun(intern(lit("relate"), user_package), func_n3o(relate, 2));