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-rw-r--r--src/guile/skribilo/package/diff.scm28
1 files changed, 24 insertions, 4 deletions
diff --git a/src/guile/skribilo/package/diff.scm b/src/guile/skribilo/package/diff.scm
index 15fdcf2..3aeed08 100644
--- a/src/guile/skribilo/package/diff.scm
+++ b/src/guile/skribilo/package/diff.scm
@@ -189,6 +189,10 @@
toc
index &index-entry &the-index &the-index-header))
+(define %diffable-options
+ ;; List of diffable options.
+ '(:title :text))
+
(define (annotated-string-diff str1 str2)
;; Return a list (actually an AST) denoting the differences between STR1
;; and STR2. The returned text is actually that of STR2 augmented with
@@ -218,6 +222,18 @@
(define (undiffable? kind)
(memq kind %undiffable-markups))
+ (define (make-diff-options m1 m2 loop)
+ ;; Return a list of options based on that of markup M2.
+ (map (lambda (opt+val)
+ (let ((opt (car opt+val)))
+ (if (memq opt %diffable-options)
+ (cons opt
+ (loop (markup-option m1 opt)
+ (cdr opt+val)))
+ opt+val)))
+ (markup-options m2)))
+
+
(let loop ((ast1 ast1)
(ast2 ast2))
;;(format (current-error-port) "diff: ~a ~a~%" ast1 ast2)
@@ -252,14 +268,16 @@
((container? ast2)
(let ((kind (markup-markup ast2))
(ident (markup-ident ast2))
- (opts (markup-options ast2))
(class (markup-class ast2))
(body (markup-body ast2)))
(new container
(markup kind)
(ident ident)
(class class)
- (options opts)
+ (options (if (or (undiffable? kind)
+ (not (container? ast1)))
+ (markup-options ast2)
+ (make-diff-options ast1 ast2 loop)))
(body (if (undiffable? kind)
body
(loop (if (and (container? ast1)
@@ -271,14 +289,16 @@
((markup? ast2)
(let ((kind (markup-markup ast2))
(ident (markup-ident ast2))
- (opts (markup-options ast2))
(class (markup-class ast2))
(body (markup-body ast2)))
(new markup
(markup kind)
(ident ident)
(class class)
- (options opts)
+ (options (if (or (undiffable? kind)
+ (not (markup? ast1)))
+ (markup-options ast2)
+ (make-diff-options ast1 ast2 loop)))
(body (if (undiffable? kind)
body
(loop (if (is-markup? ast1 kind)