Simplifying importing with pointer-pointer return.

diff --git a/lsp-misc/define-import.lsp b/lsp-misc/define-import.lsp
new file mode 100644 (file)
index 0000000..2b3bfc7
--- /dev/null
+++ b/lsp-misc/define-import.lsp
@@ -0,0 +1,39 @@
+
+;; (import-define ...) is a combination of an import clause and a
+;; define clause so as to set up a "raw" import with a call wrapper.
+;; 
+;
+; (context 'ALSA)
+; (define-import PCM LIB
+;    "snd_pcm_open" "int"
+;    "void*" PCM  ; "void*" ; snd_pcm_t **pcmp [output]
+;    "char*" NAME   ; const char *name
+;    "int"   STREAM ; snd_pcm_stream_t stream
+;    "int"   MODE   ; int mode
+;    ))
+
+(define-macro (define-import DATA LIB)
+  ;; Make a raw import
+  (println (history true))
+  (letn ((ARGL (transpose (explode (2 (args)) 2)))
+         (HERE (prefix (last (ARGL 1))))
+         (RAW  (context (sym (string (println (term HERE)) ".raw"))))
+         (NAME (sym (args 0)))
+         (ARGS (ARGL 1))
+         (FN (cons (sym (args 0) HERE) (filter (fn (x) (!= DATA x)) ARGS)))
+         (LIB (eval LIB))
+         (IMP (apply import (filter string? (cons LIB (args)))))
+         )
+    (println (list 'FN FN))
+    (if DATA
+        (letex ((FN FN)
+                (CALL (cons IMP ARGS))
+                (DATA DATA))
+          (define FN
+            (let ((DATA (pack "Lu" 0)))
+              (when (>= CALL)
+                ((unpack "Lu" DATA) 0)))))
+      (letex ((FN FN) (CALL (cons IMP ARGS)))
+        (define FN CALL))
+      )))
+(global 'define-import)