diff --git a/.config/template/src/utils.typ b/.config/template/src/utils.typ
index 7e1ba9b..abf292b 100644
--- a/.config/template/src/utils.typ
+++ b/.config/template/src/utils.typ
@@ -1,7 +1,44 @@
+/// captioned image with label derived from path:
+/// - "image.png" = @image
+/// - "img/image.png" = @image
+/// - "img/foo/image.png" = @foo_image
+/// - "img/foo/foo_image.png" = @foo_image
+/// the caption will be modified based on a conditional positional value:
+/// - `none`: no change
+/// - some value: "`caption` (за даними `value`)"
+/// - no value: "`caption` (рисунок виконано самостійно)"
+/// additional named arguments will be passed to original `image` function
+#let img(path, caption, ..sink) = {
+  let parts = path.split(".").first().split("/")
+
+  let label_string = if (
+    parts.len() <= 2 or parts.at(-1).starts-with(parts.at(-2))
+  ) {
+    // ("image",), (_, "image") and (.., "img", "img_image")
+    parts.last()
+  } else {
+    // (.., "img", "image") = "img_image"
+    parts.at(-2) + "_" + parts.at(-1)
+  }.replace(" ", "_")
+
+  let caption = if sink.pos().len() == 0 {
+    caption
+  } else if sink.pos().first() == none {
+    caption + " (рисунок виконано самостійно)"
+  } else {
+    [#caption (за даними #sink.pos().first())]
+  }
+
+  [#figure(
+      image(path, ..sink.named()),
+      caption: caption,
+    ) #label(label_string)]
+}
+
 /// takes in a string of code, e.g. #code(read("foo.c"))
 #let code(content) = raw(block: true, theme: none, content)
 
-/// read file as bytes
+/// read path as bytes
 #let p(path) = bytes(read(path, encoding: none))
 
 /// include chapters by file names from /chapters
diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..9ebf43c
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+use flake path:$(pwd)
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..ce228ff
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,61 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1769018530,
+        "narHash": "sha256-MJ27Cy2NtBEV5tsK+YraYr2g851f3Fl1LpNHDzDX15c=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "88d3861acdd3d2f0e361767018218e51810df8a1",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..1db0c23
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,20 @@
+{
+  description = "Top-level Nix flake for script dependencies";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  inputs.flake-utils.url = "github:numtide/flake-utils";
+
+  outputs = {
+    nixpkgs,
+    flake-utils,
+    ...
+  }:
+    flake-utils.lib.eachDefaultSystem (system: let
+      pkgs = nixpkgs.legacyPackages.${system};
+      # inherit (pkgs) lib;
+    in {
+      devShells.default = pkgs.mkShellNoCC {
+        packages = with pkgs; [nushell just];
+      };
+    });
+}