Unfurl mechanic.dev exported task config into folder per task

mechanic_export_unfurl.sh

#!/usr/bin/env bash
# Usage: mechanic_export_unfurl.sh [file]   (default: raw_export.json)
# Reads an encode JSON array of Mechanic tasks (using the Export feature) and writes each task as a folder:
#   [task name]/config.json  - task JSON without script (pretty-printed)
#   [task name]/script.liquid - script content with newlines decoded
# Handles escaped/double-encoded JSON (if the file is a JSON string containing the array).

set -euo pipefail

SCRIPT_DIR=$(cd -- "$(dirname "$0")" && pwd)
DEFAULT_INPUT="${SCRIPT_DIR}/raw_export.json"

input="${1:-$DEFAULT_INPUT}"
if [[ "$input" == "-" ]]; then
  raw=$(cat)
else
  if [[ ! -r "$input" ]]; then
    echo "expand.sh: cannot read $input" >&2
    exit 1
  fi
  raw=$(cat "$input")
fi

# If content is an escaped JSON string (e.g. "[{\"name\":...}]"), decode once to get the array
json=$(echo "$raw" | jq -c 'if type == "string" then fromjson else . end')

# Require a non-empty array
len=$(echo "$json" | jq 'length')
if [[ -z "$len" ]] || [[ "$len" -lt 1 ]]; then
  echo "expand.sh: no tasks found in input (expected a JSON array)." >&2
  exit 1
fi

for i in $(seq 0 $(( len - 1 )) ); do
  task=$(echo "$json" | jq -c ".[$i]")
  name=$(echo "$json" | jq -r ".[$i] | .name")
  if [[ -z "$name" ]]; then
    name="task_$i"
  fi
  dir="$name"
  # Avoid overwriting different tasks with same name
  base="$name"
  n=1
  while [[ -d "$dir" ]] && [[ "$(jq -c . "${dir}/config.json" 2>/dev/null)" != "$(echo "$task" | jq -c 'del(.script)')" ]]; do
    dir="${base} (${n})"
    n=$(( n + 1 ))
  done
  mkdir -p "$dir"
  echo "$task" | jq 'del(.script)' | jq '.' > "${dir}/config.json"
  echo "$task" | jq -r '.script // ""' > "${dir}/script.liquid"
  echo "$dir"
done