A report built with Pandoc, with continious compilation

nix-markdown-pandoc.nix

{
  description = "A report built with Pandoc, with continious compilation.";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs { inherit system; }; 
        fonts = pkgs.makeFontsConf { fontDirectories = [ pkgs.dejavu_fonts ]; };
        latexPkgs =  with pkgs; [
          pandoc
          haskellPackages.pandoc-crossref
          texlive.combined.scheme-full
        ];
        pandoc-script = pkgs.writeShellApplication {
          name = "pandoc-compile";
          runtimeInputs = latexPkgs;
          text = ''
            # Loop through each .md file in the folder
            for filename in ./*.md; do
                pandoc "$filename" \
                  -o "$1/''${filename%.md}.pdf"
            done
          '';
        };
        pandoc-compile = pkgs.writeShellApplication {
          name = "pandoc-compile";
          runtimeInputs = latexPkgs;
          text = ''${pkgs.lib.getExe pandoc-script} "."'';
        };
        pandoc-compile-continuous = pkgs.writeShellApplication {
          name = "pandoc-compile-continuous";
          runtimeInputs = [pandoc-compile pkgs.fswatch];
          text = ''
            set +e
            echo "Listening for file changes"
            fswatch --event Updated ./*.md | xargs -n 1 sh -c 'date "+%Y-%m-%d - %H:%M:%S %Z"; pandoc-compile'
          '';
        };
        report = pkgs.stdenv.mkDerivation {
          name = "LatexReport";
          src = ./.;
          buildInputs = latexPkgs;
          phases = ["unpackPhase" "buildPhase"];
          buildPhase = ''
            export FONTCONFIG_FILE=${fonts}
            mkdir -p $out
            ${pkgs.lib.getExe pandoc-script} "$out"
          '';
        };
        in {
        devShell = pkgs.mkShell {
          buildInputs = latexPkgs ++ [pandoc-compile pandoc-compile-continuous];
        };
        defaultPackage = report;
      }
    );
}