try_input.sh: Add a Docker build step

To ensure that the bat-test image is available.

Plus $PWD determinism so I can run it from anywhere.

Author: victor-gp

scripts/try_input.sh

@@ -7,6 +7,17 @@
 #   $ scripts/try_input.sh < <HELP_MSG_FILE>
 #   $ pbpaste | scripts/try_input.sh
 
+set -euo pipefail
+
+# change dir to scripts/
+cd "$(dirname "${BASH_SOURCE[0]}")"
+
+echo "building docker image ..."
+docker build -f ../tests/docker/bat-test.dockerfile -t bat-test .. &> /dev/null
+printf '\e[A\e[K' # clear previous line
+image_id=$(docker image inspect --format "{{.Id}}" bat-test)
+echo "using docker image $image_id"
+
 bat_options=(--no-config --plain --language=cmd-help --force-colorization)
 
 cat |