Stop if running low on disk space

[picsort] / pics-preprocess

#!/usr/bin/env bash

# Pass .NEF and .jpeg files as $@.
# This makes many variants of each .NEF file at different exposure levels
# and makes reduced-size versions for faster browsing.

MINFREESPACE=$((10 * 1024 * 1024)) # 10GiB in KiB

SMALLHEIGHT=700

renice -n 19 $$

for f;do
  if (( "$(df -k . | awk 'NR == 2 { print $4 }')" < $MINFREESPACE ));then
    echo "Out of disk space"
    break
  fi
  if [[ "$f" == *.NEF ]];then
    for level in {10..30};do
      mkdir -p {,sm/}"$level"
      base="$(basename "$f")"
      out="$level/${base%.NEF}.jpeg"
      if [[ -s "$out" ]];then
        echo "Skipping $out"
      else
        exposure=$(dc <<< "2k $level 4 / 3.5-p")  # 10 to 30 -> -1 to 4 in .25 steps
        pics-run-ufraw "$exposure" "$f" "$out"
      fi
      if [[ -s "sm/$out" ]];then
        echo "Skipping sm/$out"
      else
        convert "$out" -geometry "x$SMALLHEIGHT" "sm/$out"
      fi
    done
  else
    if [[ -s "sm/$f" ]];then
      echo "Skipping sm/$f"
    else
      mkdir -p sm
      convert "$f" -geometry "x$SMALLHEIGHT" "sm/$f"
    fi
  fi
done