Re: Scheme expressions on lilypond command line (-e)
This is excellent, Aaron, thanks very much. Learning by example suits me well, and I'm enjoying getting into Scheme. I use Python + Java all day long on the job (in fact used Python to generate all of the music parts of the score I'm working on -- it's originally a Csound piece that was written using Python in the first place), and it's good for the brain to get stretched into a different paradigm. - Dave On Mon, Oct 19, 2020 at 11:26 PM Aaron Hill wrote: > On 2020-10-19 7:51 pm, Dave Seidel wrote: > > More succinct: > > > > #(begin > > (use-modules (guile-user)) > > > > (if (not(defined? 'part)) > > (define partName "") > > (define partName (string-append "S" (number->string part))) > > ) > > ) > > To be even more succinct, observe the following: > > > Avoid negated predicates by swapping the consequent and alternate. > > (if (defined? 'part) > (define partName (string-append "S" (number->string part))) > (define partName "")) > > > > Extract common logic from consequent and alternate. > > (define partName >(if (defined? 'part) >(string-append "S" (number->string part)) >"")) > > > > Use formatted output instead of manual string conversion/concatenation. > > (define partName >(if (defined? 'part) >(format #f "S~d" part) >"")) > > > > -- Aaron Hill > >
Re: Scheme expressions on lilypond command line (-e)
On 2020-10-19 7:51 pm, Dave Seidel wrote: More succinct: #(begin (use-modules (guile-user)) (if (not(defined? 'part)) (define partName "") (define partName (string-append "S" (number->string part))) ) ) To be even more succinct, observe the following: Avoid negated predicates by swapping the consequent and alternate. (if (defined? 'part) (define partName (string-append "S" (number->string part))) (define partName "")) Extract common logic from consequent and alternate. (define partName (if (defined? 'part) (string-append "S" (number->string part)) "")) Use formatted output instead of manual string conversion/concatenation. (define partName (if (defined? 'part) (format #f "S~d" part) "")) -- Aaron Hill
Re: Scheme expressions on lilypond command line (-e)
On 2020-10-19 7:51 pm, Dave Seidel wrote: More succinct: #(begin (use-modules (guile-user)) (if (not(defined? 'part)) (define partName "") (define partName (string-append "S" (number->string part))) ) ) partName = #(or (false-if-exception (format #f "S~d" (@ (guile-user) part))) "")) Interesting. I don't understand the '@' syntax -- been trying to look it up but so far to no avail. https://www.gnu.org/software/guile/docs/docs-1.8/guile-ref/Using-Guile-Modules.html#Using-Guile-Modules -- Aaron Hill
Re: Scheme expressions on lilypond command line (-e)
More succinct: #(begin (use-modules (guile-user)) (if (not(defined? 'part)) (define partName "") (define partName (string-append "S" (number->string part))) ) ) though the warning still prints, but that's not a big deal for me. On Mon, Oct 19, 2020 at 10:23 PM Dave Seidel wrote: > Interesting. I don't understand the '@' syntax -- been trying to look it > up but so far to no avail. > > Here's what I ended up with: > > #(begin > (use-modules (guile-user)) > > (if (not(symbol? 'part)) > (define part 0) > ) > > (if (= part 0) > (define partName "") > (define partName (string-append "S" (number->string part))) > ) > ) > > which gives me a default value for "part" if not defined on the command > line. The "partName" variable is used later: if non-null, the script will > print parts instead of a full score, thus > > lilypond -o Hexany_Permutations hexany_permutations.ly > lilypond -e "(define part 1)" -o Hexany_Permutations_S1 > hexany_permutations.ly > lilypond -e "(define part 2)" -o Hexany_Permutations_S2 > hexany_permutations.ly > lilypond -e "(define part 3)" -o Hexany_Permutations_S3 > hexany_permutations.ly > lilypond -e "(define part 4)" -o Hexany_Permutations_S4 > hexany_permutations.ly > lilypond -e "(define part 5)" -o Hexany_Permutations_S5 > hexany_permutations.ly > lilypond -e "(define part 6)" -o Hexany_Permutations_S6 > hexany_permutations.ly > > which yields a PDF for the full score and a separate PDF for each part > (where the instruments are designated as S1 through S6). I guess I could > probably do it all in a single invocation, but I haven't gotten that far > yet -- only been using Lilypond for about a week now. > > - Dave > > On Mon, Oct 19, 2020 at 6:22 PM Aaron Hill > wrote: > >> On 2020-10-19 2:45 pm, Jean Abou Samra wrote: >> > You can ignore the warning that shows up >> > (https://gitlab.com/lilypond/lilypond/-/issues/3613). >> >> You can avoid the warning by using the @ syntax: >> >> eval-scope.ly >> \version "2.20.0" >> #(format #t "\nvalue = ~s" >>(false-if-exception (@ (guile-user) value))) >> >> >> >> > lilypond eval-scope.ly >> GNU LilyPond 2.20.0 >> Processing `eval-scope.ly' >> Parsing... >> value = #f >> Success: compilation successfully completed >> >> > lilypond -e "(define-public value 123)" eval-scope.ly >> GNU LilyPond 2.20.0 >> Processing `eval-scope.ly' >> Parsing... >> value = 123 >> Success: compilation successfully completed >> >> >> >> -- Aaron Hill >> >>
Re: Scheme expressions on lilypond command line (-e)
Interesting. I don't understand the '@' syntax -- been trying to look it up but so far to no avail. Here's what I ended up with: #(begin (use-modules (guile-user)) (if (not(symbol? 'part)) (define part 0) ) (if (= part 0) (define partName "") (define partName (string-append "S" (number->string part))) ) ) which gives me a default value for "part" if not defined on the command line. The "partName" variable is used later: if non-null, the script will print parts instead of a full score, thus lilypond -o Hexany_Permutations hexany_permutations.ly lilypond -e "(define part 1)" -o Hexany_Permutations_S1 hexany_permutations.ly lilypond -e "(define part 2)" -o Hexany_Permutations_S2 hexany_permutations.ly lilypond -e "(define part 3)" -o Hexany_Permutations_S3 hexany_permutations.ly lilypond -e "(define part 4)" -o Hexany_Permutations_S4 hexany_permutations.ly lilypond -e "(define part 5)" -o Hexany_Permutations_S5 hexany_permutations.ly lilypond -e "(define part 6)" -o Hexany_Permutations_S6 hexany_permutations.ly which yields a PDF for the full score and a separate PDF for each part (where the instruments are designated as S1 through S6). I guess I could probably do it all in a single invocation, but I haven't gotten that far yet -- only been using Lilypond for about a week now. - Dave On Mon, Oct 19, 2020 at 6:22 PM Aaron Hill wrote: > On 2020-10-19 2:45 pm, Jean Abou Samra wrote: > > You can ignore the warning that shows up > > (https://gitlab.com/lilypond/lilypond/-/issues/3613). > > You can avoid the warning by using the @ syntax: > > eval-scope.ly > \version "2.20.0" > #(format #t "\nvalue = ~s" >(false-if-exception (@ (guile-user) value))) > > > > > lilypond eval-scope.ly > GNU LilyPond 2.20.0 > Processing `eval-scope.ly' > Parsing... > value = #f > Success: compilation successfully completed > > > lilypond -e "(define-public value 123)" eval-scope.ly > GNU LilyPond 2.20.0 > Processing `eval-scope.ly' > Parsing... > value = 123 > Success: compilation successfully completed > > > > -- Aaron Hill > >
Re: Scheme expressions on lilypond command line (-e)
On 2020-10-19 2:45 pm, Jean Abou Samra wrote: You can ignore the warning that shows up (https://gitlab.com/lilypond/lilypond/-/issues/3613). You can avoid the warning by using the @ syntax: eval-scope.ly \version "2.20.0" #(format #t "\nvalue = ~s" (false-if-exception (@ (guile-user) value))) lilypond eval-scope.ly GNU LilyPond 2.20.0 Processing `eval-scope.ly' Parsing... value = #f Success: compilation successfully completed lilypond -e "(define-public value 123)" eval-scope.ly GNU LilyPond 2.20.0 Processing `eval-scope.ly' Parsing... value = 123 Success: compilation successfully completed -- Aaron Hill
Re: Scheme expressions on lilypond command line (-e)
Thanks Jean! I need to read more carefully! On Mon, Oct 19, 2020 at 5:45 PM Jean Abou Samra wrote: > > Le 19/10/2020 à 23:14, Dave Seidel a écrit : > > Hi all, > > I am trying to define a variable on the command line that I can use within > the .ly file. I've tried both > > -e "(define-public part 1)" > > and > > -e "(define part 1)" > > > In the .ly file, I have a Scheme expression > > #(if (= part 0) > (define partName "") > (define partName (string-append "S" part)) > ) > > > In either case, I get the error > > GUILE signaled an error for the expression beginning here > # > (if (= part 0) > Unbound variable: part > > > I guess I'm either defining the variable incorrectly, or dereferencing it > incorrectly within the script. Can someone help? > > Thanks, > > Dave > > > Hi, > > Have a look at > > > lilypond.org/doc/v2.21/Documentation/usage/command_002dline-usage#basic-command-line-options-for-lilypond.html > > You need > > #(use-modules (guile-user)) > > at the top of your LilyPond source. > > You can ignore the warning that shows up > (https://gitlab.com/lilypond/lilypond/-/issues/3613). > > Best, > Jean > >
Re: Scheme expressions on lilypond command line (-e)
Le 19/10/2020 à 23:14, Dave Seidel a écrit : Hi all, I am trying to define a variable on the command line that I can use within the .ly file. I've tried both -e "(define-public part 1)" and -e "(define part 1)" In the .ly file, I have a Scheme expression #(if (= part 0) (define partName "") (define partName (string-append "S" part)) ) In either case, I get the error GUILE signaled an error for the expression beginning here # (if (= part 0) Unbound variable: part I guess I'm either defining the variable incorrectly, or dereferencing it incorrectly within the script. Can someone help? Thanks, Dave Hi, Have a look at lilypond.org/doc/v2.21/Documentation/usage/command_002dline-usage#basic-command-line-options-for-lilypond.html You need #(use-modules (guile-user)) at the top of your LilyPond source. You can ignore the warning that shows up (https://gitlab.com/lilypond/lilypond/-/issues/3613). Best, Jean
