Add to_snake_case

snakify

@@ -1,12 +0,0 @@
-#!/usr/bin/env zsh
-
-# Snakify - convert file names to_snake_case
-filename=$(basename -- "$1")
-extension="${filename##*.}"
-filename="${filename%.*}"
-new_filename=$(echo ${filename// /_} | tr '-' '_' | tr -cd '[:alnum:]._-')
-new_basename=$(echo "$new_filename.$extension")
-mv -i "$1" "$new_basename"
-if ! [ "$new_basename" = "${new_basename:l}" ]; then
-    mv -i "$new_basename" "${new_basename:l}"
-fi

to_snake_case

@@ -0,0 +1,43 @@
+#!/usr/bin/env bash
+
+# I shamefully used ChatGPT to generate this. My brain just is not suited to
+# coming up with that regex on my own and I didn't have much luck searching
+# the web for helpful material.
+
+# Function to convert a string to snake_case
+to_snake_case() {
+    local input="$1"
+    local snake_case
+    snake_case=$(echo "$input" | sed -E 's/[[:space:]]+/_/g; s/([a-z])([A-Z])/\1_\2/g; s/[^a-zA-Z0-9_]+/_/g; s/__+/_/g; s/^_+|_+$//g' | tr '[:upper:]' '[:lower:]')
+    echo "$snake_case"
+}
+
+# Check if the file name is provided as an argument
+if [ -z "$1" ]; then
+    echo "Usage: $0 <file-name>"
+    exit 1
+fi
+
+# Get the file name from the argument
+file_name="$1"
+
+# Extract the directory, base name, and extension
+dir=$(dirname "$file_name")
+base_name=$(basename "$file_name")
+extension="${base_name##*.}"
+base_name="${base_name%.*}"
+
+# Convert the base name to snake_case
+snake_case_base_name=$(to_snake_case "$base_name")
+
+# Construct the new file name
+if [ "$base_name" == "$extension" ]; then
+    new_file_name="$dir/$snake_case_base_name"
+else
+    new_file_name="$dir/$snake_case_base_name.$extension"
+fi
+
+# Rename the file
+mv "$file_name" "$new_file_name"
+
+echo "File renamed to: $new_file_name"