r2915: *** empty log message ***

[lml.git] / utils.lisp

diff --git a/utils.lisp b/utils.lisp
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+;;; $Id: utils.lisp,v 1.1 2002/09/30 10:26:43 kevin Exp $
+;;;;
+;;;; General purpose utilities
+
+(in-package :lml)
+
+
+(defmacro aif (test then &optional else)
+  `(let ((it ,test))
+     (if it ,then ,else)))
+
+(defmacro awhen (test-form &body body)
+  `(aif ,test-form
+        (progn ,@body)))
+
+(defun keyword-symbol? (x)
+  "Returns T if object is a symbol in the keyword package"
+  (and (symbolp x)
+       (string-equal "keyword" (package-name (symbol-package x)))))
+
+(defun list-to-spaced-string (list)
+  (format nil "~{ ~A~}" list))
+
+(defun indent-spaces (n &optional (stream *standard-output*))
+  "Indent n*2 spaces to output stream"
+  (let ((fmt (format nil "~~~DT" (+ n n))))
+    (format stream fmt)))
+
+(defun print-file-contents (file &optional (strm *standard-output*))
+  "Opens a reads a file. Returns the contents as a single string"
+  (when (probe-file file)
+    (with-open-file (in file :direction :input)
+                   (do ((line (read-line in nil 'eof) 
+                              (read-line in nil 'eof)))
+                       ((eql line 'eof))
+                     (format strm "~A~%" line)))))
+
+(defun date-string (ut)
+  (if (typep ut 'integer)
+      (multiple-value-bind (sec min hr day mon year dow daylight-p zone)
+         (decode-universal-time ut)
+       (declare (ignore daylight-p zone))
+       (format nil "~[Mon~;Tue~;Wed~;Thu~;Fri~;Sat~;Sun~], ~
+~d ~[Jan~;Feb~;Mar~;Apr~;May~;Jun~;Jul~;Aug~;Sep~;Oct~;Nov~;Dec~] ~d ~
+~2,'0d:~2,'0d:~2,'0d" 
+               dow
+               day
+               (1- mon)
+               year
+               hr min sec))))
+
+(defun lml-quit (&optional (code 0))
+  "Function to exit the Lisp implementation. Copied from CLOCC's QUIT function."
+    #+allegro (excl:exit code)
+    #+clisp (#+lisp=cl ext:quit #-lisp=cl lisp:quit code)
+    #+cmu (ext:quit code)
+    #+cormanlisp (win32:exitprocess code)
+    #+gcl (lisp:bye code)
+    #+lispworks (lw:quit :status code)
+    #+lucid (lcl:quit code)
+    #+sbcl (sb-ext:quit :unix-status (typecase code (number code) (null 0) (t 1)))
+    #-(or allegro clisp cmu cormanlisp gcl lispworks lucid sbcl)
+    (error 'not-implemented :proc (list 'quit code)))
+
+
+(defun lml-cwd ()
+  "Returns the current working directory. Based on CLOCC's DEFAULT-DIRECTORY function."
+  #+allegro (excl:current-directory)
+  #+clisp (#+lisp=cl ext:default-directory #-lisp=cl lisp:default-directory)
+  #+cmu (ext:default-directory)
+  #+cormanlisp (ccl:get-current-directory)
+  #+lispworks (hcl:get-working-directory)
+  #+lucid (lcl:working-directory)
+  #-(or allegro clisp cmu cormanlisp lispworks lucid) (truename "."))
+
+