fix script

generate_readme.sh

@@ -1,45 +1,44 @@
 #!/usr/bin/env bash
+set -euo pipefail
+
 OUT="README.md"
 ROOT="$(pwd)"
 
+# Header & TOC start
 cat > "$OUT" <<EOF
 # Wallpapers Collection
 
 ## Table of Contents
 EOF
 
-# Generate TOC
+# TOC: folders only
 for dir in */; do
   dir_name="${dir%/}"
-  cat >> "$OUT" <<EOF
-- [${dir_name}](#${dir_name,,}|sed='s/ /-/g|sed='s/[^a-z0-9-]//g')
-EOF
+  anchor=$(printf '%s' "${dir_name}" \
+    | tr '[:upper:]' '[:lower:]' \
+    | sed 's/ /-/g; s/[^a-z0-9-]//g')
+  echo "- [${dir_name}](#${anchor})" >> "$OUT"
 done
 
-cat >> "$OUT" <<EOF
+echo -e "\n---\n" >> "$OUT"
 
-EOF
-
-# Add sections
+# Sections: folder content
 for dir in */; do
   dir_name="${dir%/}"
-  anchor=$(echo "$dir_name" | tr '[:upper:]' '[:lower:]' | sed 's/ /-/g; s/[^a-z0-9-]//g')
-  cat >> "$OUT" <<EOF
----
-
-## ${dir_name} <a name="${anchor}"></a>
-
-EOF
-  for img in "$dir"*.*; do
+  anchor=$(printf '%s' "${dir_name}" \
+    | tr '[:upper:]' '[:lower:]' \
+    | sed 's/ /-/g; s/[^a-z0-9-]//g')
+  echo "## ${dir_name}" >> "$OUT"
+  echo "" >> "$OUT"
+  for img in "${dir}"*.{png,jpg,jpeg,gif}; do
     [ -f "$img" ] || continue
     fn="$(basename "${img%.*}")"
-    rel="${dir}${fn}${img##*.}"
-    cat >> "$OUT" <<EOF
-### ${fn}
-
-![${fn}](${rel})
-
-EOF
+    rel="${dir}$(basename "$img")"
+    echo "### ${fn}" >> "$OUT"
+    echo "" >> "$OUT"
+    echo "![${fn}](${rel})" >> "$OUT"
+    echo "" >> "$OUT"
   done
+  echo "" >> "$OUT"
 done