On Mon, Jun 25, 2018 at 4:04 PM, Urs Liska <li...@openlilylib.org> wrote:
> CCing to the list. > > Am 25.06.2018 um 21:47 schrieb Freeman Gilmore: > > > > On Mon, Jun 25, 2018 at 9:29 AM, Urs Liska <li...@openlilylib.org> wrote: > >> Hi Freeman, >> >> Am 25.06.2018 um 15:03 schrieb Freeman Gilmore: >> >> Can scheme alone be used in Frescobaldi (or scheme sandbox)? >> >> >> It's not clear to me what you want ot achieve. >> >> The Scheme sandbox is surely not available in Frescobaldi. >> >> You can of course write LilyPond files that exclusively contain Scheme >> code, and that code doesn't have to be related to scores. But at least the >> entry point must be LilyPond language. >> >> Try this file: >> >> \version "2.19.80" >> >> #(let >> ((something 'something-else)) >> (display something) >> (newline) >> (display something)(display something)) >> >> It will do in Scheme what you tell it, and from there you have access to >> anything you can do with Guile Scheme (and the LilyPond environment set up >> automatically). >> >> That will give you syntax highlighting and auto-indentation from >> Frescobaldi (much better than the Scheme sandbox) but no immediate >> expression evaluation. >> >> HTH >> Urs >> >> thank you, >> ƒg >> >> > Thanks Urs: > > That worked. Problem was that I did not know that the results would be > displayed in the log window. The tutorial I am using had some example > like (+ 1 2 3) => and I was expecting 6 in the same window on the next > line when I compiled. > > > This is what one refers to as a REPL (read-eval-print-loop), which is what > LilyPond's Scheme sandbox does. > > This may be what you mean by " but no immediate expression evaluation". > > > Yes. Frescobaldi deals with LilyPond *files*, not an immediate expression > evaluation. > > Is => valid in guile? > > > No. > > How would I display the results of (+ 1 2 3), at this point of the > tutorial it just says "(+ 1 2 3) => 6"? > > > When a tutorial writes "=>" it means: "You type in '(+ 1 2 3)', and the > REPL will display '6'. So "=>" isn't a syntactical construct but a > typographical convention for "the expression to the left evaluates to the > datum on the right". > > Tutorials usually want you to learn from this immediate evaluation, and in > Frescobaldi you have to always do that extra step to display something. But > in general it's worth the effort, and I do that 90% of the time when I want > to try something out or learn more about Scheme. > > > For displaying values you can use #(display) or #(ly:message "Some value: > ~a" data) (to start with ...) > > HTH > Urs > > > Thank you, > ƒg > > Urs: In you first example #(let...) what function does 'let' preform? From your examples in "For displaying values you can use #(display) or #(ly:message "Some value: ~a" data) (to start with ...)", could you please give me examples of each? I need this to study the tutorial using Frescobaldi. Thank you, ƒg > > > > >
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