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#!/usr/bin/env bash
### description ################################################################
# A partial replacement for Debian's "run-parts" tool. Execute files in a
# directory in their lexical order with the specialty of being able to
# use symlinks to create an order without executing the files twice.
### shellcheck #################################################################
# Nothing here.
### dependencies ###############################################################
# Nothing here.
### variables ##################################################################
# Nothing here.
### functions ##################################################################
function main
{
local mode=$1
local dir=$2
local file_pattern
if [ -d "$dir" ]; then
# reconstruct to make it proper (e.g. remove superfluous slashes)
dir=$(dirname "$dir")/$(basename "$dir")
else
# split into directory and file
file_pattern=$(basename "$dir")
dir=$(dirname "$dir")
fi
file_pattern=${file_pattern:-*} # default pattern is "*"
local linked_files
linked_files=$(find "$dir" -type l -exec readlink {} +)
for file in "$dir"/$file_pattern; do # requires 'shopt -s nullglob'
# Only process files that have no symlinks (in that same directory) pointing
# at them.
if [[ "$linked_files" != *$(basename "$file")* ]]; then
case "$mode" in
list)
echo "$file"
;;
run)
$file
;;
esac
fi
done
}
### main #######################################################################
set -e
shopt -s nullglob # in case no files are found
case "$1" in
list)
main "list" "$2"
;;
*)
main "run" "$1"
;;
esac
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