Expand FTP index builder tool

diff --git a/make-ftpindex.sh b/make-ftpindex.sh
old mode 100644 (file)
new mode 100755 (executable)
index 58cd618..5771285
--- a/make-ftpindex.sh
+++ b/make-ftpindex.sh
@@ -1,4 +1,13 @@
 #!/bin/sh
+# shellcheck disable=SC2006,SC2268
+
+Version_Notice='
+make-ftpindex (GNU Secure Software Gatekeeper) 0.2-pre
+Copyright (C) 2023 Jacob Bachmeyer.
+License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>
+This is free software: you are free to change and redistribute it.
+There is NO WARRANTY, to the extent permitted by law.
+'
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -13,7 +22,87 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
-ls -lrRt /home/ftp | gzip -9 -c > /home/ftp/ls-lrRt.txt.gz
-cd /home/ftp
-find . | gzip -9 -c > /home/ftp/find.txt.gz
-tree -aJsD --timefmt %s | gzip -9 -c > /home/ftp/tree.json.gz
+version () { echo "$Version_Notice" | awk '/^$/ { next }
+    $1 == "Copyright" { out = $1 OFS $2 }
+    out && $NF ~ /[[:digit:]]/ { yr = $NF }
+    out && $NF !~ /[[:digit:]]/ {
+        for (i = NF; i>0 && $i !~ /[[:digit:]]/; i--) ;
+        if ($i ~ /[[:digit:]]/) yr = $i; i++
+        sub(/^[[:digit:]]+-/, "", yr)
+        for (out = out OFS yr; i<=NF; i++) out = out OFS $i
+        print out; out = ""; next
+    }
+    !out { print }'
+    exit 0
+}
+
+usage () {
+    echo usage: "$0" '<PublicDir> [<StageDir>]'
+}
+
+help () {
+    usage
+    cat <<EOH
+Regenerate conventional FTP index files.
+
+Options:
+  -n, --dry-run  generate files but leave them in staging directory
+      --help     display this help and exit
+      --version  output version information and exit
+
+EOH
+    exit 0
+}
+
+error () {
+    echo "$@"
+    exit 1
+}
+
+DryRun=false
+while test $# -gt 0
+do
+    case $1 in
+       -n|--dry-run) DryRun=true ; shift;;
+       --help)       help ;;
+       --version)    version ;;
+       *)
+           if test x${PublicDir:+y} = x; then
+               PublicDir=$1
+           elif test x${StageDir:+y} = x; then
+               StageDir=$1
+           elif test x${PublicDir:+y}${StageDir:+y} = xyy; then
+               usage
+               exit 2
+           fi
+           shift
+           ;;
+    esac
+done
+
+: "${StageDir:=${TMPDIR:-/tmp}}"
+
+if test x"$PublicDir" = x || test ! -d "$PublicDir" || test ! -d "$StageDir"
+then
+    test -d "$PublicDir" || echo directory "'$PublicDir'" does not exist
+    test -d "$StageDir" || echo directory "'$StageDir'" does not exist
+    usage
+    exit 2
+fi
+
+cd "$PublicDir" || error cannot move to directory "'$PublicDir'"
+
+find . | gzip -9 -c > "${StageDir}"/find.txt.gz
+tree -aJsD --timefmt %s | gzip -9 -c > "${StageDir}"/tree.json.gz
+cd .. || error cannot move to parent of "'$PublicDir'"
+# shellcheck disable=SC2012 # for obvious reasons...
+ls -lrRt "$(basename "$PublicDir")" | gzip -9 -c > "${StageDir}"/ls-lrRt.txt.gz
+
+if $DryRun; then exit 0; fi
+
+mv -f "${StageDir}"/ls-lrRt.txt.gz \
+    "${StageDir}"/find.txt.gz \
+    "${StageDir}"/tree.json.gz \
+    "${PublicDir}"
+
+# EOF