Add chronicling america flattening script

src/flatten_chronicling_america.sh

@@ -0,0 +1,37 @@
+#!/usr/bin/env bash
+set -Eeuo pipefail
+
+# Usage: ./flatten_chronam.sh az_bentonite_ver02
+BATCH_DIR="${1:?need batch dir}"
+
+# 1) Collapse .../YYYY/MM/DD → .../YYYY-MM-DD
+if find -E "$BATCH_DIR" -type d -depth -regex '.*/[0-9]{4}/[0-9]{2}/[0-9]{2}$' -print0 >/dev/null 2>&1; then
+  FIND_DATE=(find -E "$BATCH_DIR" -type d -depth -regex '.*/[0-9]{4}/[0-9]{2}/[0-9]{2}$' -print0)
+else
+  FIND_DATE=(find "$BATCH_DIR" -regextype posix-extended -type d -depth -regex '.*/[0-9]{4}/[0-9]{2}/[0-9]{2}$' -print0)
+fi
+
+"${FIND_DATE[@]}" | while IFS= read -r -d '' d; do
+  y=$(basename "$(dirname "$(dirname "$d")")")
+  m=$(basename "$(dirname "$d")")
+  dd=$(basename "$d")
+  root=$(dirname "$(dirname "$(dirname "$d")")")
+  tgt="$root/$y-$m-$dd"
+  [[ -e "$tgt" ]] || mv "$d" "$tgt"
+  rmdir -p "$(dirname "$d")" 2>/dev/null || true
+done
+
+# 2) Flatten .../YYYY-MM-DD/ed-*/seq-*/ocr.txt → .../YYYY-MM-DD/ed-<n>-seq-<m>-ocr.txt
+find "$BATCH_DIR" -type f -name 'ocr.txt' -path '*/sn*/????-??-??/ed-*/seq-*/ocr.txt' -print0 \
+| while IFS= read -r -d '' f; do
+  seq_dir="$(dirname "$f")"
+  ed_dir="$(dirname "$seq_dir")"
+  date_dir="$(dirname "$ed_dir")"
+  ed="$(basename "$ed_dir")"     # ed-1
+  seq="$(basename "$seq_dir")"   # seq-1
+  tgt="$date_dir/$ed-$seq-ocr.txt"
+  [[ -e "$tgt" ]] || mv "$f" "$tgt"
+  rmdir "$seq_dir" 2>/dev/null || true
+  rmdir "$ed_dir"  2>/dev/null || true
+done
+