Just a quick try not using @-exps. Does something like this look good? #lang scheme (define (py-format str couples) (regexp-replace* "~<([^>]*)>([aAsSvVeEcCbBoOxX])" str (lambda(all key str-format) (let ([key-val (assoc key couples)]) (if key-val (format (string-append "~" str-format) (second key-val)) (error "Key not found in py-format: " key)))))) (py-format "~<x>a ~<y>a ~<z>s" '(("x" "ola") ("y" (hey "hey")) ("z" "salute"))) ; "ola (hey hey) \"salute\"" <div class="gmail_quote">On Wed, Feb 10, 2010 at 17:10, Todd O'Bryan <<a href="mailto:toddobryan@gmail.com">toddobryan@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><div class="im">On Tue, Feb 9, 2010 at 10:40 PM, Eli Barzilay <<a href="mailto:eli@barzilay.org">eli@barzilay.org</a>> wrote: > > Basic output: > > #lang at-exp scheme > (require scribble/text) > (define foo "FOO") > (define bar "BAR") > (output @list{@foo and @bar}) > > (It's easy to make it return a string instead, I just didn't provide > another function (or a keyword argument or something) because there > was no need and I didn't see any interface that was obviously better.) > > This is using the same functionality that the web server templates are > using, but you don't need the extra overhead of using the web server > or separate files. Here's how you'd do it: > > #lang scribble/text > @(define foo "FOO") > @(define bar "BAR") > @foo and @bar > @(define (choose x y) @list{@x before @y or @y before @|x|?}) > @choose[foo bar] > </div>The nice thing about the Python version is that you can just have a string with placeholders for values you're going to include later. Am I correct that I really need to write a function (like choose above) that expects the values I want to go into the string so that the @-exprs don't get evaluated before they have values? Obviously, that's not much more difficult, but my brain just didn't go there automatically. Clearly, I need to spend more time programming in Scheme. :-) Todd <div><div></div><div class="h5">_________________________________________________ For list-related administrative tasks: <a href="http://list.cs.brown.edu/mailman/listinfo/plt-scheme" target="_blank">http://list.cs.brown.edu/mailman/listinfo/plt-scheme</a> </div></div></blockquote></div>