doc-src/IsarOverview/Isar/makeDemo

+#!/usr/bin/perl -w
+
+sub doit {
+    my ($file) = @_;
+
+    open (FILE, $file) || die $!;
+    undef $/; $text = <FILE>; $/ = "\n";
+    close FILE || die $!;
+
+    $_ = $text;
+
+    s/text_raw\{\*([^*]|\*[^}])*\*\}//sg;       # actual work done here
+    s/text\{\*([^*]|\*[^}])*\*\}//sg;       # actual work done here
+    s/\(\*<\*\)//sg;
+    s/\(\*>\*\)//sg;
+    s/--(\ )*"([^"])*"//sg;
+    s/--(\ )*\{\*([^*]|\*[^}])*\*\}//sg;
+
+    $result = $_;
+
+    if ($text ne $result) {
+        print STDERR "fixing $file\n";
+#        if (! -f "$file~~") {
+#            rename $file, "$file~~" || die $!;
+#        }
+        open (FILE, "> Demo/$file") || die $!;
+        print FILE $result;
+        close FILE || die $!;
+    }
+}
+
+
+foreach $file (@ARGV) {
+  eval { &doit($file); };
+  if ($@) { print STDERR "*** doit $file: ", $@, "\n"; }
+}