lib: new function for documentation lookup.

* genman.txr: dump contents of symhash into a doc-syms.tl
library file, as a defvarl form.

* lisplib.c (doc_instantiate, doc_set_entries): New static
functions.
(lisplib_init): Register autoload for doc-lookup module
to symbols doc and *doc-url*.

* share/txr/stdlib/doc-lookup.tl: New file.

* share/txr/stdlib/doc-syms.tl: Likewise.

* txr.1: Documented.

1 files changed, 18 insertions, 0 deletions

diff --git a/lisplib.c b/lisplib.c
index a425d95b..c37cb4a5 100644
--- a/lisplib.c
+++ b/lisplib.c
@@ -891,6 +891,23 @@ static val match_set_entries(val dlt, val fun)
   return nil;
 }
 
+static val doc_instantiate(val set_fun)
+{
+  funcall1(set_fun, nil);
+  load(scat2(stdlib_path, lit("doc-lookup")));
+  return nil;
+}
+
+static val doc_set_entries(val dlt, val fun)
+{
+  val name[] = {
+    lit("doc"), lit("*doc-url*"),
+    nil
+  };
+  set_dlt_entries(dlt, name, fun);
+  return nil;
+}
+
 val dlt_register(val dlt,
                  val (*instantiate)(val),
                  val (*set_entries)(val, val))
@@ -946,6 +963,7 @@ void lisplib_init(void)
   dlt_register(dl_table, each_prod_instantiate, each_prod_set_entries);
   dlt_register(dl_table, quips_instantiate, quips_set_entries);
   dlt_register(dl_table, match_instantiate, match_set_entries);
+  dlt_register(dl_table, doc_instantiate, doc_set_entries);
 
   reg_fun(intern(lit("try-load"), system_package), func_n1(lisplib_try_load));
 }