added fetchfromgh, which takes a github username and repo like someuser/somerepo and returns a pkgs.fetchFromGitHub call

modules/home/scripts/nix/fetchfromgh.nix

@@ -0,0 +1,38 @@
+{ pkgs ? import <nixpkgs> { } }:
+
+pkgs.writeShellApplication {
+  name = "fetchfromgh";
+  runtimeInputs = [
+    pkgs.nix-prefetch-scripts
+  ];
+  text = ''
+    if [ $# -ne 1 ] || ! echo "$1" | grep -qE "[A-Za-z0-9_-]+/[A-Za-z0-9_-]+"; then
+      echo "Usage: fetchfromgh someuser/somerepo"
+      echo "     - i.e. fetchfromgh pagedMov/nixos-config"
+      exit 1
+    fi
+
+  if ! curl -s -o /dev/null -w "%{http_code}" "https://github.com/$1" | grep -q "200"; then
+    echo "Couldn't find that repository, curl returned 404."
+    exit 1
+  fi
+
+    json=$(nix-prefetch-git --quiet "https://github.com/$1")
+
+    url=$(echo "$json" | jq '.url' | tr -d '"')
+    owner=$(echo "$url" | awk -F'/' '{print $(NF-1)}')
+    repo=$(echo "$url" | awk -F'/' '{print $NF}')
+    rev=$(echo "$json" | jq '.rev' | tr -d '"')
+    hash=$(echo "$json" | jq '.hash' | tr -d '"')
+
+    output="\
+    src = pkgs.fetchFromGitHub {
+      owner = \"$owner\";
+      repo = \"$repo\";
+      rev = \"$rev\";
+      hash = \"$hash\";
+    };
+    "
+    echo "$output"
+  '';
+}