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#!/bin/sh
# can improve by passing $@ to functions, but seems need bashism, or abandon functions
# maybe use $1 for getext and use getopts, maybe seperate getext as another script, maybe add option for using ln instead of mv
# references:
# https://stackoverflow.com/questions/1842254/how-can-i-find-all-of-the-distinct-file-extensions-in-a-folder-hierarchy
getext ()
{
find . -maxdepth 1 -type f | awk -F. '!a[$NF]++{print $NF}'
}
outdir ()
{
find . -type f -execdir mv -t "$(realpath .)" '{}' \+
find . -mindepth 1 -maxdepth 1 -type d -execdir rm -r '{}' \+
}
# may further optimize by output file extension names to a variable and use it for both mkdir and mv, current is fast enough for me
indir ()
{
getext | xargs mkdir
# don't know why -print0/-0 for find and xargs doesn't work here
find . -mindepth 1 -maxdepth 1 -type d -execdir basename '{}' \; | xargs -I _ find . -maxdepth 1 -type f -name '*._' -execdir mv -t '_' '{}' \+
}
case "$1" in
'-e') getext;;
'-o') outdir;;
'-i') indir;;
*) outdir; indir;;
esac
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