add variant sample

flake.lock

@@ -0,0 +1,25 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1731890469,
+        "narHash": "sha256-D1FNZ70NmQEwNxpSSdTXCSklBH1z2isPR84J6DQrJGs=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "5083ec887760adfe12af64830a66807423a859a7",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,19 @@
+{
+  description = "Website";
+
+  outputs = { self, nixpkgs }:
+    let pkgs = nixpkgs.legacyPackages.x86_64-linux;
+    in {
+      devShell.x86_64-linux = with pkgs;
+        mkShell {
+          nativeBuildInputs = [
+            imagemagick
+            just
+            libavif
+            libjxl
+            pandoc
+            tup
+          ];
+        };
+  };
+}

variant_path/.gitignore

@@ -0,0 +1,2 @@
+/build-default
+!/build-default/tup.config

variant_path/Tuprules.tup

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+&templates_dir = ./templates
+
+# This doesn't work, cannot find the generated header.txt
+# I want to access the variant path for templates/ but $(TUP_VARIANTDIR) will
+# follow the current Tupfile and there is no variant "anchor" like &-variables.
+!add_header = | &(templates_dir)/<header_group> |> cat &(templates_dir)/header.txt %f &(templates_dir)/footer.txt > %o |> %B.gen.txt
+
+# This works
+#!add_header = | &(templates_dir)/<header_group> |> cat %f &(templates_dir)/footer.txt > %o |> %B.gen.txt

variant_path/nested/a/Tupfile

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+include_rules
+
+: a.txt |> !add_header |>

variant_path/nested/a/a.txt

@@ -0,0 +1 @@
+letter a

variant_path/nested/a/b/Tupfile

@@ -0,0 +1,3 @@
+include_rules
+
+: b.txt |> !add_header |>

variant_path/nested/a/b/b.txt

@@ -0,0 +1 @@
+letter b

variant_path/nested/a/b/c/Tupfile

@@ -0,0 +1,3 @@
+include_rules
+
+: c.txt |> !add_header |>

variant_path/nested/a/b/c/c.txt

@@ -0,0 +1 @@
+letter c

variant_path/templates/Tupfile

@@ -0,0 +1 @@
+: |> ./generate_header.sh > %o |> header.txt ./<header_group>

variant_path/templates/footer.txt

@@ -0,0 +1,2 @@
+-- 
+the end

variant_path/templates/generate_header.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+cat << EOF
+YEAR $(date +%Y)
+====
+EOF