Add progress skeleton.

progress.scm

@@ -0,0 +1,70 @@
+;;
+;; progress.scm
+;;
+;; Progress reporting.
+;;
+;; ISC License
+;;
+;; Copyright 2023 Brmlab, z.s.
+;; Dominik Pantůček <dominik.pantucek@trustica.cz>
+;;
+;; Permission to use, copy, modify, and/or distribute this software
+;; for any purpose with or without fee is hereby granted, provided
+;; that the above copyright notice and this permission notice appear
+;; in all copies.
+;; 
+;; THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
+;; WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
+;; WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
+;; AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
+;; CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+;; OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
+;; NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+;; CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+;;
+
+(declare (unit configuration))
+
+(module
+ progress
+ (
+  run-with-progress
+  progress-advance
+  with-progress
+  )
+
+ (import scheme
+	 (chicken base)
+	 (chicken format)
+	 (chicken port))
+
+ ;; Parameterized current progress string
+ (define *current-progress* (make-parameter #f))
+
+ ;; Prints current progress.
+ (define (print-current-progress . args)
+   (display (sprintf "\r\x1b[K~A" (*current-progress*))))
+
+ ;; Adds something to current progress and refreshes the display.
+ (define (progress-advance str)
+   (*current-progress* (string-append (*current-progress*) (sprintf "~A" str)))
+   (print-current-progress))
+
+ ;; Runs given procedure within progress environment
+ (define (run-with-progress pre-msg post-msg thunk)
+   (parameterize ((*current-progress* pre-msg))
+     (print-current-progress)
+     (thunk)
+     (print-current-progress)
+     (print post-msg)))
+
+ ;; Friendly syntax wrapper.
+ (define-syntax with-progress
+   (syntax-rules ()
+     ((_ pre post body ...)
+      (run-with-progress pre post (lambda () body ...)))))
+
+ ;; If the program uses progress module, disable buffering
+ (set-buffering-mode! (current-output-port) #:none)
+
+ )