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23 lines
672 B
Nix
23 lines
672 B
Nix
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{
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config,
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lib,
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...
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}: let
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# The attribute set of pdf viewers in this configuration.
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pdfViewers = config.vim.languages.tex.pdfViewer;
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# The list of pdf viewers in this configuration.
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pdfViewersList = builtins.attrValues pdfViewers;
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# The list of enabled pdf viewers.
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enabledPdfViewersList = builtins.filter (x: x.enable) pdfViewersList;
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# The number of enabled pdf viewers.
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enabledPdfViewersCount = lib.lists.count (x: x.enable) pdfViewersList;
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in
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if (enabledPdfViewersCount == 0)
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# Use the fallback if no pdf viewer was enabled.
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then pdfViewers.fallback
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# Otherwise get the first enabled viewer.
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else builtins.head enabledPdfViewersList
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