dils

#!/usr/bin/env bash
# dils — wrapper for `docker image ls`
# Output: fixed-width columns "REPOSITORY:TAG  CREATED" (no header), sorted by REPOSITORY:TAG.
# Optional 1 arg: literal substring to match repo OR tag (case-sensitive).
# Widths can be overridden via env: DILS_COL1_WIDTH (default 56), DILS_COL2_WIDTH (default 16).

set -euo pipefail

usage() {
  echo "Usage: dils [pattern]" >&2
  echo "Env:   DILS_COL1_WIDTH (default 56), DILS_COL2_WIDTH (default 16)" >&2
}

if [[ ${1-} == "-h" || ${1-} == "--help" ]]; then usage; exit 0; fi
if [[ $# -gt 1 ]]; then usage; exit 2; fi

if ! command -v docker >/dev/null 2>&1; then
  echo "Error: docker not found in PATH." >&2
  exit 127
fi

COL1_WIDTH="${DILS_COL1_WIDTH:-96}" # REPOSITORY:TAG
COL2_WIDTH="${DILS_COL2_WIDTH:-24}" # CREATED (e.g., "2 weeks ago")

# Compose "ref|created" so we can sort/filter on ref only.
FORMAT='{{.Repository}}:{{.Tag}}|{{.CreatedSince}}'

# Pull and optionally filter
if [[ $# -eq 1 && -n "${1}" ]]; then
  PATTERN="$1"
  docker image ls --format "${FORMAT}" \
    | awk -F'|' -v pat="$PATTERN" 'index($1, pat) > 0' \
    | LC_ALL=C sort -t'|' -k1,1
else
  docker image ls --format "${FORMAT}" \
    | LC_ALL=C sort -t'|' -k1,1
fi \
| awk -F'|' -v w1="$COL1_WIDTH" -v w2="$COL2_WIDTH" '
  {
    ref=$1; created=$2
    # Fixed width with truncation if necessary; left-aligned.
    printf "%-*.*s %-*.*s\n", w1, w1, ref, w2, w2, created
  }'