Btukfyl

I want to use the value of a flag imported from a datatool database (stored in an external .csv file) to enable (or disable) a beamer frame.

The .csv file is of the form:

begin{filecontents*}{test.csv} 

test enable

test1 ok

test2 ok

test3 ok

end{filecontents*}

Imported into a datatool database :

DTLloaddb{test}{test.csv}

My command:

newcommand{frameIsEnabled}[1]{ifstrequal{#1}{ok}{1}{0}}

I'm trying to use the frameIsEnabled command to enable the frame fetching the database value:

begin{frame}<presentation: frameIsEnabled{DTLfetch{test}{test1}{enable}}>

But latex is not happy. I suppose there is something wrong related to the format of the fetched value DTLfetch{test}{test1}{enable}.

If I display it (i.e. in a table or text) it returns zero (i.e. the comparison with the string "ok" returns false).

Here's a minimal example to reproduce my problem.

Example 1, to verify the comparison of the "enable" flag with the string "ok":

documentclass[6pt]{beamer}

usepackage[utf8]{inputenc}

usepackage[T1]{fontenc}

usepackage{graphicx}

mode<presentation>{usetheme{Malmoe}}

usepackage{datatool}

usepackage{filecontents}



begin{filecontents*}{test.csv} 

testName, enable

test1, ok

test2, ok

test3, ok

end{filecontents*}



newcommand{frameIsEnabled}[1]{ifstrequal{#1}{ok}{1}{0}}



DTLloaddb[headers={testName, enable}]{testList}{test.csv}



title{My Presentation}



begin{document}

    begin{frame}<presentation:1>

    Test1 enable flag is "DTLfetch{testList}{testName}{test1}{enable}".



    Comparison with "ok" returns frameIsEnabled{DTLfetch{testList}{testName}{test1}{enable}}.

    end{frame}

end{document}

Within this code, the frameIsEnabled command will return 0, while the desired output is 1

Example 2, using the fetched value from the database to enable the frame:

documentclass[6pt]{beamer}

usepackage[utf8]{inputenc}

usepackage[T1]{fontenc}

usepackage{graphicx}

mode<presentation>{usetheme{Malmoe}}

usepackage{datatool}

usepackage{filecontents}



begin{filecontents*}{test.csv} 

testName, enable

test1, ok

test2, ok

test3, ok

end{filecontents*}



newcommand{frameIsEnabled}[1]{ifstrequal{#1}{ok}{1}{0}}



DTLloaddb[headers={testName, enable}]{testList}{test.csv}



title{My Presentation}



begin{document}

    begin{frame}<presentation:frameIsEnabled{DTLfetch{testList}{testName}{test1}{enable}}>

    Test1 enable flag is "DTLfetch{testList}{testName}{test1}{enable}".



    Comparison with "ok" returns frameIsEnabled{DTLfetch{testList}{testName}{test1}{enable}}.

    end{frame}

end{document}

This code will throw the error:

Illegal parameter number in definition of beamer@@@temp. end{frame}

The problem is that the commands you use are not expandable. To worka round this problem one can combine https://tex.stackexchange.com/a/386503/36296 and https://tex.stackexchange.com/a/335489/36296

documentclass{beamer}

usepackage[utf8]{inputenc}

usepackage[T1]{fontenc}

%usepackage{graphicx}

mode<presentation>{usetheme{Malmoe}}

usepackage{datatool}

usepackage{filecontents}



begin{filecontents*}{test.csv} 

testName, enable

test1, ok

test2, ok

test3, ok

end{filecontents*}



usepackage{xparse}



ExplSyntaxOn

NewExpandableDocumentCommand{xifstrequal}{mmmm}

 {

  str_if_eq_x:nnTF { #1 } { #2 } { #3 } { #4 }

 }

ExplSyntaxOff



newcommand{DTLfetchsave}[5]{%

  edtlgetrowforvalue{#2}{dtlcolumnindex{#2}{#3}}{#4}%

  dtlgetentryfromcurrentrow{dtlcurrentvalue}{dtlcolumnindex{#2}{#5}}%

  let#1dtlcurrentvalue

}



newcommand{frameIsEnabled}[1]{xifstrequal{#1}{ok}{1}{0}}



DTLloaddb[headers={testName, enable}]{testList}{test.csv}



title{My Presentation}



begin{document}



begin{frame}

content...

end{frame}





DTLfetchsave{temp}{testList}{testName}{test1}{enable}%

begin{frame}<presentation:frameIsEnabled{temp}>

    Test1 enable flag is "DTLfetch{testList}{testName}{test1}{enable}".



end{frame}

end{document}