#!/bin/bash
name="enumerate"
version="1.0"
read -r -d '' help_message <<-EOF
Rename files in current directory into sequential numbers
Usage: enumerate [OPTIONS]
Options:
-d, --dry-run print, not execute, changes (Default)
-f P, --filter P filter targets with filename pattern P
-h, --help print this message and exit
-q, --quiet suppress error messages
-s N, --start N start enumeration at N (Default: 1)
-S N, --step N step enumeration by N (Default: 1)
-v, --verbose show additional messages
-V, --version print version number and exit
-w N, --width N rename files to numbers N wide (Default: 4)
-x, --execute execute changes
EOF
source /usr/local/lib/mylib.bash
positional=()
execute=0
filter="*"
enum_start=1
enum_step=1
width=4
quiet=0
verbose=0
while [[ $# -gt 0 ]]; do
case $1 in
-f|--filter)
debug_msg "Setting filter option to ${2} (was ${filter})"
filter="$2"
shift; shift
;;
-h|--help)
help_msg
shift
;;
-q|--quiet)
debug_msg "Setting quiet option to 1 (was ${quiet})"
quiet=1
shift
;;
-s|--start)
if ! is_natural "$2"; then
error_msg "Cannot set enumeration start to '${2}' (not an integer >= 0)"
fi
debug_msg "Setting enumeration start to ${2} (was ${enum_start})"
enum_start="$2"
shift; shift
;;
-S|--step)
if ! is_positive_integer "$2"; then
error_msg "Cannot set enumeration step to '${2}' (not an integer >= 1)"
fi
debug_msg "Setting enumeration step to ${2} (was ${enum_step})"
enum_step="$2"
shift; shift
;;
-v|--verbose)
debug_msg "Setting verbose option to 1 (was ${verbose})"
verbose=1
shift
;;
-V|--version)
version_msg
;;
-w|--width)
if ! is_natural "$2"; then
error_msg "Cannot set filename width to '${2}' (not an integer >= 0)"
fi
debug_msg "Setting filename width to ${2} (was ${width})"
width="$2"
shift; shift
;;
-x|--execute)
debug_msg "Setting execution to 1 (was ${execute})"
execute=1
shift
;;
*)
debug_msg "Argument '${1}' added to positional array"
positional+=("$1")
shift
;;
esac
done
# main routine
n="$enum_start"
s="$enum_step"
code=0
find . -maxdepth 1 -name "$filter" -type f -printf "%f\0" \
| sort -z \
| while IFS= read -r -d '' original_fn; do
wide_n=$(/usr/bin/printf "%0*d\n" "$width" "$n")
enum_fn="${wide_n}.$(fn_extension "$original_fn")"
debug_msg "Widened format of '${n}' is '${wide_n}'"
debug_msg "Input filename is '${original_fn}'"
debug_msg "Output filename is '${enum_fn}'"
if [[ "$execute" -eq 1 ]]; then
if ! mv "$original_fn" "${enum_fn}"; then
code=1
fi
else
/usr/bin/printf "#mv %s %s\n" "$original_fn" "$enum_fn"
fi
n=$((n+s))
done
# return stored code
exit "$code"