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diff --git a/generate.sh b/generate.sh
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+#!/bin/sh
+# File: generate.sh
+# Author: bgstack15@gmail.com
+# Startdate: 2021-01-24
+# Title: Generate symlink Forests 
+# Package: gallery
+# Purpose: turn indir into a year/month set of symlinks at outdir
+# History:
+# Usage:
+#    Useful for running before sigal.bin.
+# Reference:
+# Improve:
+#    replace tildes in video filenames!
+#    rewrite in python
+# Dependencies:
+#    exiftool
+
+test -z "${indir}" && export indir="${1}"
+test -z "${outdir}" && export outdir="${2}"
+{ test -z "${indir}" || test ! -d "${indir}" ; } && { echo "First parameter must be input path. Aborted." 1>&2 ; exit 1 ; }
+{ test -z "${outdir}" || test ! -d "${outdir}" ; } && { echo "Second parameter must be output path. Aborted." 1>&2 ; exit 1 ; }
+# strip trailing slashes
+export indir="${indir%%/}"
+export outdir="${outdir%%/}"
+for tf in $( find "${indir}" ! -type d ! -name '*.sh' ! -name '*.git*' ! -name '.*.swp' ) ;
+do
+   YM="$( exiftool -t -createdate "${tf}" | awk -F'\t' '{print $NF}' | awk -F' ' '{print $1}' | awk -F ':' 'BEGIN{OFS="/"} {print $1,$2}' )"
+   test ! -d "${outdir}/${YM}" && {
+      test -n "${DEBUG}" && echo "mkdir -p ${outdir}/${YM}"
+      test -z "${DRYRUN}" && mkdir -p "${outdir}/${YM}"
+   }
+   test -n "${DEBUG}" && echo "ln -s ${tf} ${outdir}/${YM}/"
+   test -z "${DRYRUN}" && ln -s "${tf}" "${outdir}/${YM}/"
+done