flake: add texlab to devshell

flake.nix

@@ -1,21 +1,22 @@
 {
   description = "LaTeX Beamer Presentation for GPUL Schools: Software Libre";
   inputs = {
-    nixpkgs.url = github:NixOS/nixpkgs/nixos-25.05;
-    flake-utils.url = github:numtide/flake-utils;
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.05";
+    flake-utils.url = "github:numtide/flake-utils";
   };
 
-  outputs = {
-    self,
-    nixpkgs,
-    flake-utils,
-  }:
+  outputs =
+    {
+      self,
+      nixpkgs,
+      flake-utils,
+    }:
     flake-utils.lib.eachDefaultSystem (
-      system: let
+      system:
+      let
         pkgs = nixpkgs.legacyPackages.${system};
         tex = pkgs.texlive.combine {
-          inherit
-            (pkgs.texlive)
+          inherit (pkgs.texlive)
             scheme-basic
             latex-bin
             latexmk
@@ -30,13 +31,21 @@
             ;
         };
         # tex = pkgs.texliveFull;
-      in rec {
+      in
+      rec {
         packages = {
           document = pkgs.stdenvNoCC.mkDerivation rec {
             name = "latex-beamer-gpul-schools-software-libre";
             src = self;
-            buildInputs = [pkgs.coreutils tex];
-            phases = ["unpackPhase" "buildPhase" "installPhase"];
+            buildInputs = [
+              pkgs.coreutils
+              tex
+            ];
+            phases = [
+              "unpackPhase"
+              "buildPhase"
+              "installPhase"
+            ];
             buildPhase = ''
               export PATH="${pkgs.lib.makeBinPath buildInputs}";
               env TEXMFVAR=$(mktemp -d) \
@@ -54,7 +63,7 @@
         defaultPackage = packages.document;
 
         devShells.default = pkgs.mkShell {
-          buildInputs = packages.document.buildInputs;
+          buildInputs = packages.document.buildInputs ++ (with pkgs; [ texlab ]);
         };
       }
     );

main.tex

@@ -19,7 +19,7 @@
 
 \date{\today}
 
-\logo{\includegraphics[height=1cm]{logo-gpul.png}}
+\logo{\includegraphics[height=1cm]{img/logo-gpul.png}}
 
 \begin{document}
 	
@@ -43,7 +43,7 @@
 		
 		\vspace{0.5em}
 		\begin{center}
-			\includegraphics[width=0.7\linewidth]{logo-fsf.org}
+			\includegraphics[width=0.7\linewidth]{img/logo-fsf.org}
 		\end{center}
 	\end{frame}
 	
@@ -61,7 +61,7 @@
 	
 	\vspace{0.5em}
 	\begin{center}
-		\includegraphics[width=0.6\linewidth]{logo-osi.png}
+		\includegraphics[width=0.6\linewidth]{img/logo-osi.png}
 	\end{center}
 	
 	\cite{gnu_open_source}
@@ -85,7 +85,7 @@
 	
 	\vspace{0.5em}
 	\begin{center}
-		\includegraphics[width=0.2\linewidth]{tux.png}
+		\includegraphics[width=0.2\linewidth]{img/tux.png}
 	\end{center}
 	\end{frame}
 	
@@ -107,7 +107,7 @@
 		
 		\vspace{0.5em}
 		\begin{center}
-			\includegraphics[width=0.2\linewidth]{logo-gnu.png}
+			\includegraphics[width=0.2\linewidth]{img/logo-gnu.png}
 		\end{center}
 		
 		\vspace{-2em}