A highlight line function

highlight_line.sh

# highlight_line
#
# arg $1 file path; it can contain the line directly at the end after :
# arg $2 line or range; the line if it was not specified in the file path ($1)
# arg $3 range; the range +- to display from the line
#
# Usage example:
#  hl file/path/foo.txt 47
#  hl file/path/foo.txt 47 3
#  hl file/path/foo.txt:47
#  hl file/path/foo.txt:47 3
function hl() {
  local file
  local line
  local range

  # Check if argument is provided
  if [ -z "$1" ]; then
    echo "Error: No argument provided. Usage: highlight_line file_path:line_number [range]"
    return 1
  fi

  # Check if argument contains a colon
  if [[ "$1" == *":"* ]]; then
    IFS=':' read -r file line <<< "$1"
    range="$2"
  else
    file="$1"
    line="$2"
    range="$3"
  fi

  # Check if file exists
  if [ ! -f "$file" ]; then
    echo "Error: File '$file' does not exist."
    return 1
  fi

  # Check if line number is provided
  if [ -z "$line" ]; then
    echo "Error: No line number provided. Usage: highlight_line file_path:line_number [range]"
    return 1
  fi

  # Set default range to 5 if not provided
  range="${range:-5}"

  awk -v line="$line" -v range="$range" '
  {
    if (NR == line)
      print "\033[1;31m" NR, $0 "\033[0m";
    else if (NR >= line-range && NR <= line+range)
      print NR, $0;
  }' "$file"
}