take full-length screenshots of pages using firefox

.gitignore

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+/tests-results/

screenshot-full-firefox.sh

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+#!/usr/bin/env nix-shell
+#!nix-shell --pure -i bash -p firefox-esr bash -I nixpkgs=https://github.com/NixOS/nixpkgs/archive/fea633695211167753ee732c9087808d0c57461c.tar.gz
+
+set -euET -o pipefail
+
+usage() {
+  printf "Usage: ./screenshot-full-firefox.sh url filename"\\n
+}
+
+if test $# -ne 2; then
+  usage
+  exit 1
+elif test $# -eq 1 && (test "x$1" = "x-h" || test "x$1" = "x--help"); then
+  usage
+  exit 0
+fi
+
+url="$1"
+image="$2"
+
+temp_profile_home="$(mktemp -d)"
+
+function cleanup() {
+  rm -fr --one-file-system "$temp_profile_home"
+}
+
+trap cleanup EXIT
+
+HOME="$temp_profile_home" firefox --headless --window-size 1920 --screenshot "$image" "$url"

tests.sh

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+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p bash nix -I nixpkgs=https://github.com/NixOS/nixpkgs/archive/fea633695211167753ee732c9087808d0c57461c.tar.gz
+
+# Older nix-shell --pure versions prevent nested nix-shells to properly download dependencies, so the above doesn't use --pure.
+# If this script increases in complexity and becomes more sensitive to env vars, use --pure and wrap it with an impure launcher.
+
+set -euET -o pipefail
+
+for i in tests/*.sh; do
+  "$i"
+done

tests/test-screenshot-full-firefox.sh

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+#!/usr/bin/env nix-shell
+#!nix-shell --pure -i bash -p bash nix -I nixpkgs=https://github.com/NixOS/nixpkgs/archive/fea633695211167753ee732c9087808d0c57461c.tar.gz
+
+set -euET -o pipefail
+
+cd "$(dirname "$0")"
+../screenshot-full-firefox.sh https://example.com/ ../tests-results/screenshots-full-firefox.png