Bulk rename files inside a directory

.scripts/rename.sh

@@ -0,0 +1,100 @@
+#!/bin/sh
+
+# Bulk rename files inside a directory
+# Depends:
+
+# User-config-------------------------------
+
+# Define editor to open file in
+set -- emacsclient -a ''
+
+# ------------------------------------------
+
+# Output formatting
+B=$(tput bold)
+L=$(tput setf 1) # Blue
+N=$(tput sgr0)
+
+format() {
+	echo "${B}${L}::${N}${B} ${1}${N}"
+}
+
+cleanup() {
+	[ -f "$tmpfile" ] && rm -f "$tmpfile"
+	exit "${1:-0}"
+}
+
+signal() {
+	echo
+	cleanup 1
+}
+
+# ------------------------------------------
+
+# Get all filenames in the current directory
+files=$(find . -maxdepth 1 -type f -printf '%P\n' | sort)
+
+# Write all filesnames to tmpfile
+tmpfile=$(mktemp)
+trap signal HUP INT TERM
+echo "$files" > "$tmpfile"
+
+# Open tmpfile in editor, wait to continue
+md5_before=$(md5sum "$tmpfile")
+format "Waiting for editor..."
+"$@" "$tmpfile" > /dev/null
+md5_after=$(md5sum "$tmpfile")
+
+# Exit if nothing was changed
+[ "$md5_before" = "$md5_after" ] && cleanup 1
+
+# Exit on mismatch entry size
+lines_before=$(echo "$files" | wc -l)
+lines_after=$(wc -l "$tmpfile" | cut -d ' ' -f 1)
+if [ "$lines_before" != "$lines_after" ]; then
+	echo "File amount mismatch!"
+	cleanup 1
+fi
+
+# Exit if file has a space
+if grep -Fq ' ' "$tmpfile"; then
+	echo "Filenames with spaces are not supported!"
+	cleanup 1
+fi
+
+# Create file commands
+i=1
+for file in $files; do
+	newFile=$(sed -n "${i}p" "$tmpfile")
+
+	if [ "$file" = "$newFile" ]; then
+		command=""
+	else
+		[ -z "$newFile" ] && command="rm -f ${file}" || command="mv ${file} \0"
+	fi
+
+	sed -i "${i}s/.*/${command}/;" "$tmpfile" > /dev/null
+
+	i=$((i+1))
+done
+
+# Delete empty lines
+sed -Ei '/^\s*$/d' "$tmpfile"
+
+# Display commands
+prompt=$(cat "$tmpfile")
+printf "\n%s\n\n" "$prompt"
+
+# Confirm with user
+printf "%s " "$(format "Proceed with execution? [Y/n]")"
+read -r execute
+
+# Execute file commands
+if [ "$execute" = "" ] || [ "$execute" = "y" ] || [ "$execute" = "Y" ]; then
+	format "Executing commands..."
+	sh "$tmpfile"
+else
+	cleanup 1
+fi
+
+cleanup