feat: implement fup-repl blueprint #127

flake.nix

@@ -15,11 +15,16 @@
       exportPackages = import ./lib/exportPackages.nix fupArgs;
       genPkgOverlay = import ./lib/genPkgOverlay.nix;
       internal-functions = import ./lib/internal-functions.nix;
-      overlay = import ./lib/overlay.nix;
+      overlay = final: prev: {
+        __dontExport = true;
+        fup-repl = final.callPackage ./lib/fup-repl.nix { };
+      };
+
     in
     rec {
       inherit overlay;
 
+      blueprints.fup-repl = ./lib/fup-repl.nix;
       nixosModules.autoGenFromInputs = import ./lib/options.nix;
       darwinModules.autoGenFromInputs = import ./lib/options.nix;
 

lib/fup-repl.nix

@@ -0,0 +1,20 @@
+{ writeShellScriptBin, coreutils, gnused }:
+let
+  example = command: desc: ''\n\u001b[33m ${command}\u001b[0m - ${desc}'';
+in
+writeShellScriptBin "repl" ''
+  case "$1" in
+    "-h"|"--help"|"help")
+      printf "%b\n\e[4mUsage\e[0m: \
+        ${example "repl" "Loads system flake if available."} \
+        ${example "repl /path/to/flake.nix" "Loads specified flake."}\n"
+    ;;
+    *)
+      if [ -z "$1" ]; then
+        nix repl ${./repl.nix}
+      else
+        nix repl --arg flakePath $(${coreutils}/bin/readlink -f $1 | ${gnused}/bin/sed 's|/flake.nix||') ${./repl.nix}
+      fi
+    ;;
+  esac
+''