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AUD-GET-INFO function added to init.lsp 

Provide built-in Nyquist function to call scripting command
GetInfo, and return result as LISP list.
This commit is contained in:
Steve Daulton 2018-09-03 16:57:06 +01:00
parent a56a5be30b
commit ae2bbb3276
1 changed files with 20 additions and 1 deletions
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21
nyquist/init.lsp
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@ -45,7 +45,7 @@
(funcall underscore txt)))
;;; A couple of helpers for parsing strings returned by (aud-do "GetInfo: ...
;;; Some helpers for parsing strings returned by (aud-do "GetInfo: ...
(defun eval-string (string)
;;; Evaluate a string as a LISP expression.
@ -55,3 +55,22 @@
(defmacro quote-string (string)
;;; Prepend a single quote to a string
`(setf ,string (format nil "\'~a" ,string)))
(defun aud-get-info (str)
;;; Return "GetInfo: type=type" as Lisp list, or throw error
;;; Audacity 2.3.0 does not fail if type is not recognised, it
;;; falls back to a default, so test for valid types.
;;; 'Commands+' is not supported in Audacity 2.3.0
(let (type
info
(types '("Commands" "Menus" "Preferences"
"Tracks" "Clips" "Envelopes" "Labels" "Boxes")))
;Case insensitive search, then set 'type' with correct case string, or NIL.
(setf type (first (member str types :test 'string-equal)))
(if (not type)
(error (format nil "bad argument '~a' in (aud-get-info ~a)" str str)))
(setf info (aud-do (format nil "GetInfo: type=~a format=LISP" type)))
(if (not (last info))
(error (format nil "(aud-get-info ~a) failed.~%" str)))
(let ((info-string (first info)))
(eval-string (quote-string info-string)))))