From 2ce7b86b1bd5f935688a1b4334133eeec443f8fa Mon Sep 17 00:00:00 2001
From: ville rantanen <ville.rantanen@iki.fi>
Date: Wed, 19 Dec 2018 21:28:06 +0200
Subject: [PATCH] recursive md5

---
 files/md5sum-update | 56 ++++++++++++++++++++++++++++++++-------------
 1 file changed, 40 insertions(+), 16 deletions(-)

diff --git a/files/md5sum-update b/files/md5sum-update
index bf90b55..db9d179 100755
--- a/files/md5sum-update
+++ b/files/md5sum-update
@@ -1,34 +1,58 @@
 #!/bin/bash
 
 function helpexit() {
-    echo Add more files in md5sum list
-    echo 'Usage: m5sum-update [list name]'
-    echo 'list name is md5sums.txt by default'
+    echo 'Create or append md5sum list of files
+Usage: md5sum-update [-r] [list name]
+  -r recursive
+  list name is md5sums.txt by default
+
+  Check files with "md5sum -m m5sums.txt"
+  '
     exit
 }
 
-[[ "$1" = "-h" ]] && helpexit
-list_name="$1"
-[[ -z "$1" ]] && list_name="md5sums.txt"
-
+recursive=0
+list_name="md5sums.txt"
+for ((i=1; i<=${#@}; i++)) {
+    [[ "${!i}" = "-h" ]] && helpexit
+    [[ "${!i}" = "--help" ]] && helpexit
+    [[ "${!i}" = "-r" ]] && { recursive=1; continue; }
+    list_name="${!i}"
+}
+set -e
+echo "Updating: $list_name"
 test -f "$list_name" || touch "$list_name"
 
-for file in *; do
-  if [ $file = $list_name ]; then
-    continue
+_update() {
+  if [ "$file" = "$list_name" ]; then
+    return
   fi
   if test -d "$file"; then
-    echo $file is a directory
-    continue
+    echo "$file is a directory"
+    return
   fi
   if test -f "$file"; then
-    if grep -q "  $file$" $list_name; then
-      echo "$file already added"
+    if grep -q "  $file$" "$list_name"; then
+      echo "$file: exist"
     else
-      echo "$file adding..." 
+      echo "$file: new"
       md5sum "$file" >> "$list_name"
     fi
   fi
-done
+}
+
+shopt -s globstar
+shopt -s nullglob
+
+if [[ "$recursive" -eq 1 ]]; then
+  for file in **; do
+    _update
+  done
+else
+  for file in *; do
+    _update
+  done
+fi
+
 
 sort -k 2 -o "$list_name" "$list_name"