Initial commit

.envrc

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+use flake

.gitignore

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+.direnv
+GoCalTui
+bin
+result
+data

flake.lock

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+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1735563628,
+        "narHash": "sha256-OnSAY7XDSx7CtDoqNh8jwVwh4xNL/2HaJxGjryLWzX8=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "b134951a4c9f3c995fd7be05f3243f8ecd65d798",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-24.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+# flake.nix
+{
+  description = "Dev shell + runnable app for merge_pdfs.py";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.05";
+
+  outputs = { self, nixpkgs }:
+  let
+    systems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
+    forEachSystem = f: nixpkgs.lib.genAttrs systems (system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+        python = pkgs.python311.withPackages (ps: [ ps.pypdf2 ]);
+        # Small wrapper so `nix run` works: it uses the Python with PyPDF2 and your script.
+        merge-pdfs = pkgs.writeShellScriptBin "merge-pdfs" ''
+          exec ${python}/bin/python ${./merge_pdfs.py} "$@"
+        '';
+      in f pkgs python merge-pdfs
+    );
+  in {
+    devShells = forEachSystem (pkgs: python: merge-pdfs: {
+      default = pkgs.mkShell {
+        packages = [
+          python            # Python 3.11 with PyPDF2
+          pkgs.ruff         # optional: linter
+          pkgs.pyright      # optional: type checker
+        ];
+        shellHook = ''
+          echo "✅ Dev shell ready. Try:"
+          echo "  python merge_pdfs.py output.pdf a.pdf b.pdf"
+        '';
+      };
+    });
+
+    # `nix run` makes it easy to use from anywhere:
+    apps = forEachSystem (pkgs: python: merge-pdfs: {
+      default = {
+        type = "app";
+        program = "${merge-pdfs}/bin/merge-pdfs";
+      };
+    });
+
+    # expose the tiny wrapper as a package if you want `nix build .#merge-pdfs`
+    packages = forEachSystem (pkgs: python: merge-pdfs: {
+      default = merge-pdfs;
+      merge-pdfs = merge-pdfs;
+    });
+  };
+}
+

merge_pdfs.py

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+#!/usr/bin/env python3
+import sys
+from PyPDF2 import PdfMerger
+
+def merge_pdfs(output_path, input_paths):
+    merger = PdfMerger()
+    for pdf in input_paths:
+        try:
+            merger.append(pdf)
+            print(f"Added: {pdf}")
+        except FileNotFoundError:
+            print(f"Error: File not found - {pdf}")
+        except Exception as e:
+            print(f"Error adding {pdf}: {e}")
+    merger.write(output_path)
+    merger.close()
+    print(f"Merged PDF saved as: {output_path}")
+
+if __name__ == "__main__":
+    if len(sys.argv) < 4:
+        print("Usage: python merge_pdfs.py output.pdf file1.pdf file2.pdf [file3.pdf ...]")
+        sys.exit(1)
+
+    output_pdf = sys.argv[1]
+    input_pdfs = sys.argv[2:]
+    merge_pdfs(output_pdf, input_pdfs)
+