Add a 'dirty' flag to the Document structure & set it whenever a call…

…back

changes (github issue #136) so that the next mkd_compile will regenerate
the document.

markdown.c

@@ -1356,9 +1356,10 @@ mkd_compile(Document *doc, DWORD flags)
     flags &= USER_FLAGS;
 
     if ( doc->compiled ) {
-	if ( doc->ctx->flags == flags )
+	if ( doc->ctx->flags == flags && !doc->dirty)
 	    return 1;
 	else {
+	    doc->compiled = doc->dirty = 0;
 	    if ( doc->code)
 		___mkd_freeParagraph(doc->code);
 	    if ( doc->ctx->footnotes )

markdown.h

@@ -165,6 +165,7 @@ typedef struct document {
     ANCHOR(Line) content;	/* uncompiled text, not valid after compile() */
     Paragraph *code;		/* intermediate code generated by compile() */
     int compiled;		/* set after mkd_compile() */
+    int dirty;			/* flags or callbacks changed */
     int html;			/* set after (internal) htmlify() */
     int tabstop;		/* for properly expanding tabs (ick) */
     char *ref_prefix;

mkdio.c

@@ -328,8 +328,11 @@ mkd_generateline(char *bfr, int size, FILE *output, DWORD flags)
 void
 mkd_e_url(Document *f, mkd_callback_t edit)
 {
-    if ( f )
+    if ( f ) {
+	if ( f->cb.e_url != edit )
+	    f->dirty = 1;
 	f->cb.e_url = edit;
+    }
 }
 
 
@@ -338,8 +341,11 @@ mkd_e_url(Document *f, mkd_callback_t edit)
 void
 mkd_e_flags(Document *f, mkd_callback_t edit)
 {
-    if ( f )
+    if ( f ) {
+	if ( f->cb.e_flags != edit )
+	    f->dirty = 1;
 	f->cb.e_flags = edit;
+    }
 }
 
 
@@ -348,8 +354,11 @@ mkd_e_flags(Document *f, mkd_callback_t edit)
 void
 mkd_e_free(Document *f, mkd_free_t dealloc)
 {
-    if ( f )
+    if ( f ) {
+	if ( f->cb.e_free != dealloc )
+	    f->dirty = 1;
 	f->cb.e_free = dealloc;
+    }
 }
 
 
@@ -358,8 +367,11 @@ mkd_e_free(Document *f, mkd_free_t dealloc)
 void
 mkd_e_data(Document *f, void *data)
 {
-    if ( f )
+    if ( f ) {
+	if ( f->cb.e_data != data )
+	    f->dirty = 1;
 	f->cb.e_data = data;
+    }
 }
 
 
@@ -368,6 +380,9 @@ mkd_e_data(Document *f, void *data)
 void
 mkd_ref_prefix(Document *f, char *data)
 {
-    if ( f )
+    if ( f ) {
+	if ( f->ref_prefix != data )
+	    f->dirty = 1;
 	f->ref_prefix = data;
+    }
 }