A tree cat that executes.

puma.sh

#!/bin/bash

# "a tree cat that executes"
# suggested by @that-other-guy
# at https://stackoverflow.com/questions/70841809/what-should-this-bash-script-be-called

unset concatenate
OPTIND=1

while getopts 'c' opt; do
  case $opt in
    c) concatenate=1 ;;
    ,*) printf "%s\n" "OPTIONS: -c Concatenate files in INPUTPATH before piping to 'eval COMMAND'" >&2
       exit 1
  esac
done
shift "$(( OPTIND - 1 ))"

if [ $# -ne 4 ]; then
  printf 1>&2 "%s\n" "Usage: $0 [-c] INPUTPATH COMMAND OUTPUTDIR OUTPUTNAME
  Pipes files in INPUTPATH to 'eval COMMAND'
  writes output to OUTPUTDIR/files/DATE-OUTPUTNAME
  creates symbolic link at OUTPUTDIR/links/OUTPUTNAME
  OPTIONS:
    -c Concatenate files in INPUTPATH before piping to 'eval COMMAND'
  EXAMPLE:
    $0 \"assets/pictures\" \"scripts/process-assets.sh\" \"output\" \"pictures.txt\""
  exit 3
fi

inputpath="$1"
cmd="$2"
outputdir="$3"
outputname="$4"

filedir="$outputdir/files"
linkdir="$outputdir/links"

mkdir -p "$filedir" "$linkdir"

starttime=$(date +%Y%m%d-%H%M%S)
outputfile="$filedir/$starttime-$outputname"
outputlink="$linkdir/$outputname"

if [[ "$concatenate" -gt 0 ]]; then
  input=$(find "$inputpath" ! -name ".DS_Store" | sort | xargs cat)
else
  input=$(find "$inputpath" ! -name ".DS_Store" | sort)
fi

amount=$(wc -l <<< "$input");
printf 1>&2 "| %s | %s | %s | %s\n" "$inputpath" "$outputdir" "$outputname" "$amount";

eval "$cmd" <<< "$input" > "$outputfile"

rm -f "$outputlink"
ln -s "$(realpath "$outputfile")" "$outputlink"