Re: [NTG-context] getting ConTeXt results back to Lua (for typesetting solutions at end of document)

Hi Sanjoy, Two or three years ago Wolfgang helped me to solve an analogous question. Here is an example which works fine, and moreover one can navigate from a question to its hint (if there is one…) and then from the hint to its solution (if present…). Best regards: OK %%%% begin interactive-question-hint-answer.tex %%%% Here, following Wolfgang Schuster's ideas, %%%% we define some macros allowing to couple %%%% Questions, Hints and Answers in an automatic way %%%% Upon clicking on an interactive title for Question, Hint or Answer %%%% one goes to the corresponding Hint, Answer or Question \setupinteraction[state=start] % We define two counters which follow the numbers % appearing in Question and Answer \newcounter\QuestionCounter \newcounter\HintCounter \newcounter\AnswerCounter % We create two commands to be used in the % enumeration environments % Note that the check for trial typestting % \doifnotmode{*trialtypesetting} % is necessary in order to avoid unwanted incrementation \define[1]\QuestionTextCommand {\doifnotmode{*trialtypesetting} {\doglobal\increment\QuestionCounter \pagereference[question:\QuestionCounter]}% \doifreferencefoundelse{hint:\QuestionCounter} {\goto{#1}[hint:\QuestionCounter]} {#1}} \define[1]\HintTextCommand {\doifnotmode{*trialtypesetting} {\doglobal\increment\HintCounter \pagereference[hint:\HintCounter]}% \doifreferencefoundelse{answer:\QuestionCounter} {\goto{#1}[answer:\QuestionCounter]} {#1}} \define[1]\AnswerTextCommand {\doifnotmode{*trialtypesetting} {\doglobal\increment\AnswerCounter \pagereference[answer:\AnswerCounter]}% \doifreferencefoundelse{question:\AnswerCounter} {\goto{#1}[question:\AnswerCounter]} {#1}} % We define here two enumeration environments for % Questions and Answers \defineenumeration[question] [text=Question, headcommand=\QuestionTextCommand, number=yes, prefix=yes, prefixsegments=chapter, coupling=hint] \defineenumeration[hint] [text=Hint, headcommand=\HintTextCommand, number=yes, prefix=yes, prefixsegments=chapter, coupling=answer] \defineenumeration[answer] [text=Answer, headcommand=\AnswerTextCommand, number=yes, prefix=yes, prefixsegments=chapter, coupling=question] % Each question is followed immediately by its answer. % The answers are put in a block which will be used later \defineblock[hint] \hideblocks[hint] \defineblock[answer] \hideblocks[answer] % We define a command used after a % Question for which no Answer is provided % Since the block commands % \beginanswer ... \endanswer % cannot be used directly in a macro definition % we use a trick... % In the buffer the two counters associated to Answer % are incremented... \startbuffer[noanswer] \beginhint \doglobal\increment\HintCounter \incrementcounter[hint] \endhint \beginanswer \doglobal\increment\AnswerCounter \incrementcounter[answer] \endanswer \stopbuffer % ...and then the above buffer is invoked \define\noanswer {\getbuffer[noanswer]} % example of use: \starttext \startchapter[title=Questions] \startquestion[q:1] Prove that ${\rm e}\sim 2.73$ is irrational. This is the first question, with its own reference, for later use. \stopquestion \beginhint \starthint Write ${\rm e}$ as a series. \stophint \endhint \beginanswer \startanswer This is the answer to the first question (to \in{Question}[q:1]). \stopanswer \endanswer \startquestion This is the second question, without its own reference. \stopquestion \beginhint \starthint Do you really need a hint? :-) \stophint \endhint \beginanswer \startanswer[a:Test] This is the answer to the second question. (Note that this answer has a reference named \type{a:Test}). \stopanswer \endanswer \startquestion[q:Obvious] This is the third question, an easy one, without a given solution. \stopquestion % we increment here the counters for Answer \noanswer \startquestion[q:2] This is the fourth question with its own reference. \stopquestion \beginhint \starthint Do you really need a hint? :-) \stophint \endhint \beginanswer \startanswer This is the answer to the fourth question: use the result of \in{Question}[q:1]. \stopanswer \endanswer \startquestion This is the fifth question, without its own reference. ({\it Hint:} look again at \in{Question}[q:Obvious]). \stopquestion \beginhint \starthint Do you really need a hint? :-) \stophint \endhint \beginanswer \startanswer This is the answer to the fifth question. Read again \in{Answer}[a:Test]. \stopanswer \endanswer \stopchapter % Here we say ownnumber=1, in order to match the prefix % of numbers associated to Answer \startchapter[ownnumber=1,title=Hints] \useblocks[hint] \stopchapter \startchapter[ownnumber=1,title=Answers and solutions] \useblocks[answer] \stopchapter \stoptext %%%% end interactive-question-hint-answer.tex

On 1 Feb 2019, at 04:10, Sanjoy Mahajan wrote:

Thank you, Matthias and Wolfgang, for the examples/solutions.

If I understand them right, there must be one solution for each exercise (otherwise the solution numbering gets out of sync). Or do the coupling= options in Matthias's example remove that restriction? In my experiments with the examples, deleting the first solution unsynchronized the exercise--solution numbering, no matter how I fiddled with the coupling keys.

In the ideal pedagogical world, I'd write a solution for each exercise. But reality might intervene, so I still wonder if the solutions can automatically know and include the exercise number (perhaps by placing \startanswer..\stopanswer inside \startexercise..\stopexercise and using \getnumber[exercise]). If there is a clever way, that's great. But, the nature of TeX as a macro language may preclude the \getnumber code being evaluated just when one wants.

Regards, -Sanjoy ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki!

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