feat(template): add multifile-tex

templates/_multifile_tex/.envrc

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+#!/usr/bin/env bash
+# ^ make editor happy
+
+#
+# Use https://direnv.net/ to automatically load the dev shell.
+#
+
+if ! has nix_direnv_version || ! nix_direnv_version 3.0.4; then
+  source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/3.0.4/direnvrc" "sha256-DzlYZ33mWF/Gs8DDeyjr8mnVmQGx7ASYqA5WlxwvBG4="
+fi  
+
+watch_file nix/**
+watch_file -- **/*.nix
+
+# Adding files to git includes them in a flake
+# But it is also a bit much reloading.
+# watch_file .git/index .git/HEAD
+use flake . --show-trace

templates/_multifile_tex/.gitignore

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+*.aux
+*.aux
+*.fdb_latexmk
+*.fls
+*.pdf
+*.sta
+*.toc
+.auctex-auto/

templates/_multifile_tex/chapters/01.tex

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+\documentclass[class=report, crop=false]{standalone}
+\usepackage[subpreambles=true]{standalone}
+\usepackage{import}
+\usepackage{lipsum}
+
+\begin{document}
+
+\chapter{Chapter One}
+
+\lipsum[25]
+
+\end{document}

templates/_multifile_tex/chapters/02.tex

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+\documentclass[class=report, crop=false]{standalone}
+\usepackage[subpreambles=true]{standalone}
+\usepackage{import}
+\usepackage{lipsum}
+
+\begin{document}
+
+\chapter{Chapter Two}
+
+\lipsum[40]
+
+\subimport{.}{tikz-fig}
+
+\end{document}

templates/_multifile_tex/chapters/tikz-fig.tex

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+\documentclass{standalone}
+\usepackage{tikz}
+\usetikzlibrary{positioning}
+\begin{document}
+
+\begin{tikzpicture}[
+roundnode/.style={circle, draw=green!60, fill=green!5, very thick, minimum size=7mm},
+squarednode/.style={rectangle, draw=red!60, fill=red!5, very thick, minimum size=5mm},
+]
+%Nodes
+\node[squarednode]      (maintopic)                              {2};
+\node[roundnode]        (uppercircle)       [above=of maintopic] {1};
+\node[squarednode]      (rightsquare)       [right=of maintopic] {3};
+\node[roundnode]        (lowercircle)       [below=of maintopic] {4};
+
+%Lines
+\draw[->] (uppercircle.south) -- (maintopic.north);
+\draw[->] (maintopic.east) -- (rightsquare.west);
+\draw[->] (rightsquare.south) .. controls +(down:7mm) and +(right:7mm) .. (lowercircle.east);
+
+\end{tikzpicture}
+\end{document}

templates/_multifile_tex/flake.nix

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+{
+  description = "LaTeX environment";
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    flake-parts.url = "github:hercules-ci/flake-parts";
+  };
+  outputs = inputs @ {
+    self,
+    flake-parts,
+    ...
+  }:
+    flake-parts.lib.mkFlake {inherit inputs;} (top: {
+      imports = [];
+      flake = {};
+      systems = [
+        "x86_64-linux"
+        "aarch64-linux"
+        "x86_64-darwin"
+        "aarch64-darwin"
+      ];
+      perSystem = {
+        pkgs,
+        self',
+        ...
+      }: let
+        tex = pkgs.texlive.combine {
+          inherit
+            (pkgs.texlive)
+            scheme-basic
+            latexmk
+            lipsum
+            standalone
+            filehook
+            svn-prov
+            import
+            pgf
+            luatex85
+            ;
+        };
+        mainTexFileDrv = dir: file:
+          pkgs.stdenvNoCC.mkDerivation rec {
+            name = "${dir}/file";
+            src = self;
+            buildInputs = [tex];
+            phases = ["unpackPhase" "buildPhase" "installPhase"];
+            buildPhase = ''
+              export PATH="${pkgs.lib.makeBinPath (buildInputs ++ [pkgs.coreutils])}";
+              env \
+                HOME=$(mktemp -d) \
+                SOURCE_DATE_EPOCH=${toString self.lastModified} \
+                latexmk "${dir}/${file}.tex"
+            '';
+            installPhase = ''
+              mkdir -p $out
+              cp "${dir}/${file}.pdf" $out/
+            '';
+          };
+      in {
+        legacyPackages = pkgs;
+
+        packages.default = self'.packages.main;
+        packages.main = mainTexFileDrv "main";
+        packages.c01 = mainTexFileDrv "chapters" "01";
+        packages.c02 = mainTexFileDrv "chapters" "02";
+
+        devShells.default = pkgs.mkShellNoCC {
+          buildInputs = [tex pkgs.texlab];
+        };
+      };
+    });
+}

templates/_multifile_tex/latexmkrc

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+# Use lualatex as the engine
+$pdf_mode = 1;
+$pdflatex = 'lualatex -interaction=nonstopmode %O %S';
+$do_cd = 1;
+$clean_ext = "sta"

templates/_multifile_tex/main.tex

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+\documentclass{report}
+
+\usepackage[subpreambles=true]{standalone}
+\usepackage{import}
+
+\title{Standalone package example}
+\author{The almightly Flake}
+\date{\today}
+
+\begin{document}
+
+\maketitle
+
+\tableofcontents
+
+\import{chapters}{01}
+
+\import{chapters}{02}
+
+\end{document}

templates/multifile-tex.nix

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+_: {
+  flake.templates.multifile-tex = {
+    path = ./_multifile_tex;
+    description = "A multifile tex report.";
+  };
+}