Switch over to table renderer with listing.

src/Makefile

@@ -97,7 +97,7 @@ testing.o: testing.import.scm
 testing.import.scm: $(TESTING-SOURCES)
 
 LISTING-SOURCES=listing.scm testing.import.scm ansi.import.scm	\
-	util-kwargs.import.scm
+	util-kwargs.import.scm table.import.scm
 
 listing.o: listing.import.scm
 listing.import.scm: $(LISTING-SOURCES)

src/listing.scm

@@ -40,7 +40,8 @@
 	 testing
 	 ansi
 	 util-kwargs
-	 util-dict-list)
+	 util-dict-list
+	 table)
 
  ;; Returns the number of digits required to represent a given number
  ;; in decimal format.
@@ -140,12 +141,13 @@
 		 (#:highlight-pre hl-pre a:error)
 		 (#:highlight-post hl-post a:default)
 		 (#:context context 3))
-   (let ((digits (number-digits (length lines))))
-     (let loop ((lines lines)
-		(number 1)
-		(printed-something #f)
-		(was-printing #f))
-       (when (not (null? lines))
+   (let loop ((lines lines)
+	      (number 1)
+	      (printed-something #f)
+	      (was-printing #f)
+	      (rtbl '()))
+     (if (null? lines)
+	 (print (table->string (reverse rtbl) #:ansi #t))
 	 (let* ((highlight (match-highlight number highlights))
 		(hl-type (if highlight (cadddr highlight) #f))
 		(hl-def (assq hl-type highlight-rules))
@@ -154,38 +156,48 @@
 		(context? (and (not highlight)
 			       (line-near-targets? number highlights context)))
 		(print? (or highlight context?)))
-	   (cond (print?
-		  (when (and printed-something
-			     (not was-printing))
-		    (print ellipsis))
-		  (if highlight
-		      (display hl-pre-real)
-		      (when context?
-			(display ctx-pre)))
-		  (display (sprintf "~A~A~A"
-				    (format-line-number number digits)
-				    (let ((line (car lines)))
-				      (if (ldict? line)
-					  (ldict-ref line 'line)
-					  line))
-				    (let ((comment (highlight-comment number highlights)))
-				      (if comment
-					  (sprintf "  # <<< ~A" comment)
-					  ""))))
-		  (if highlight
-		      (display hl-post-real)
-		      (when context?
-			(display ctx-post)))
-		  (newline)
-		  (loop (cdr lines)
-			(+ number 1)
-			#t
-			#t))
-		 (else
-		  (loop (cdr lines)
-			(+ number 1)
-			printed-something
-			#f))))))))
+	   (if print?
+	       (let ((line (car lines))
+		     (rtbl (if (and printed-something
+				    (not was-printing))
+			       (cons (list "" ellipsis)
+				     rtbl)
+			       rtbl))
+		     (pre-str (if highlight
+				  hl-pre-real
+				  (if context?
+				      ctx-pre
+				      "")))
+		     (post-str (if highlight
+				   hl-post-real
+				   (if context?
+				       ctx-post
+				       "")))
+		     (comment (highlight-comment number highlights))
+		     )
+		 (loop (cdr lines)
+		       (add1 number)
+		       #t
+		       #t
+		       (cons (list (format "\t~A~A. ~A" pre-str number post-str)
+				   (format "~A~A~A"
+					   pre-str
+					   (if (ldict? line)
+					       (ldict-ref line 'line)
+					       line)
+					   post-str)
+				   (if comment
+				       (format "~A  # <<< ~A~A"
+					       pre-str
+					       comment
+					       post-str)
+				       "")
+				   )
+			     rtbl)))
+	       (loop (cdr lines)
+		     (+ number 1)
+		     printed-something
+		     #f))))))
 
  ;; Performs self-tests of the listing module.
  (define (listing-tests!)