macro-stepper: added step count

also removed some dead code (warnings)

original commit: 5673d7b877a4ebbf2f0ec390c97bac92d678da41

collects/macro-debugger/view/cursor.rkt

@@ -24,7 +24,8 @@
 
          cursor->list
          cursor:prefix->list
-         cursor:suffix->list)
+         cursor:suffix->list
+         cursor-count)
 
 (define-struct cursor (vector count position)
   #:mutable)

collects/macro-debugger/view/interfaces.rkt

@@ -62,6 +62,7 @@
   (get-raw-deriv
    get-deriv-hidden?
    get-step-index
+   get-step-count
    invalidate-synth!
    invalidate-steps!
 

collects/macro-debugger/view/stepper.rkt

@@ -14,7 +14,6 @@
          "interfaces.ss"
          "prefs.ss"
          "extensions.ss"
-         "warning.ss"
          "hiding-panel.ss"
          "term-record.ss"
          "step-display.ss"
@@ -103,7 +102,6 @@
     (define/public (get-controller) sbc)
     (define/public (get-view) sbview)
     (define/public (get-step-displayer) step-displayer)
-    (define/public (get-warnings-area) warnings-area)
     (define/public (get-macro-hiding-prefs) macro-hiding-prefs)
 
     (define/public (reset-primary-partition)
@@ -129,9 +127,7 @@
            (stretchable-height #f)
            (alignment '(left center))
            (style '(deleted))))
-    
-    (define warnings-area (new stepper-warnings% (parent area)))
-    
+
     (define: sbview sb:syntax-browser<%>
       (new stepper-syntax-widget% 
            (parent area)
@@ -206,7 +202,16 @@
                          (navigate-to (sub1 step))]
                         [(equal? value "end")
                          (navigate-to-end)])))))))
+
+    (define nav:step-count
+      (new message%
+           (label "")
+           (parent extra-navigator)
+           (auto-resize #t)
+           (stretchable-width #f)
+           (stretchable-height #f)))
     (send nav:text set-value "")
+
     (listen-current-step-index
      (lambda (n)
        (send nav:text set-value
@@ -388,9 +393,15 @@
 
     ;; refresh : -> void
     (define/public (refresh)
-      (send warnings-area clear)
       (when (focused-term)
         (send: (focused-term) term-record<%> on-get-focus))
+      (send nav:step-count set-label "")
+      (let ([term (focused-term)])
+        (when term
+          (let ([step-count (send: term term-record<%> get-step-count)])
+            (when step-count
+              ;; +1 for end of expansion "step"
+              (send nav:step-count set-label (format "of ~s" (add1 step-count)))))))
       (update))
 
     (define/private (foci x) (if (list? x) x (list x)))

collects/macro-debugger/view/term-record.rkt

@@ -207,7 +207,11 @@
       (and (get-steps) (not (cursor:at-end? (get-steps)))))
 
     (define/public-final (get-step-index)
-      (and (get-steps) (cursor-position (get-steps))))
+      (let ([steps (get-steps)])
+        (and steps (cursor-position steps))))
+    (define/public-final (get-step-count)
+      (let ([steps (get-steps)])
+        (and steps (cursor-count steps))))
 
     (define/public-final (navigate-to-start)
       (cursor:move-to-start (get-steps))