dotfiles/functions/set_overwrite_alias

#!/usr/bin/env bash

set_overwrite_alias() {
  local new_cmd="$1"    # e.g., "bat"
  local alias_name="$2" # e.g., "cat"

  if [ -z "$new_cmd" ] || [ -z "$alias_name" ]; then
    echo "Usage: set_overwrite_alias <new_command> <alias_name>"
    return 1
  fi

  # Check that the new command exists.
  if type "$new_cmd" >/dev/null 2>&1; then
    # Define a backup alias by appending an underscore (e.g., "cat_" for "cat")
    local backup_alias="${alias_name}_"

    # If the backup alias isn't already set, create it pointing to the original command.
    if ! command -v "$backup_alias" &>/dev/null; then
      alias "$backup_alias"="$(which "$alias_name")"
    fi

    # Create the alias: e.g., alias "cat" to "bat".
    alias "$alias_name"="$new_cmd"
  fi
}