Add script for hashing arbitrary files with imagemagick and stdin example

flake.nix

@@ -24,6 +24,7 @@
             cargo-show-asm
             clippy
             imagemagick
+            jq
             rust-analyzer
             rustc
             rustfmt

scripts/hash.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+
+set -e
+
+if ! [ -f "$1" ]; then
+  echo "$1" is not a file;
+  exit 1;
+fi
+
+json=$(magick convert "$1" JSON:-)
+
+width=$(echo $json | jq '.[0].image.geometry.width')
+height=$(echo $json | jq '.[0].image.geometry.height')
+
+magick convert "$1" RGBA:- | \
+  cargo r --example stdin --release -- \
+    --width $width \
+    --height $height