transferring several commands from private repo

shell/2fa-menu

@@ -0,0 +1,101 @@
+#!/bin/bash
+_help() {
+    echo '
+2FA code viewer
+
+Usage:
+- Create a (possible encrypted) folder for your service keys
+- When the service presents you the QRCode, you typically can
+  view the actual code as text. It looks something like:
+  I5XXIY3IMEWCA3LBMRSSA6LPOUQGY33PNMQQU===
+- Store this piece of text in a file: "Service name".key
+- Run 2fa-menu command in the folder
+
+Viewer:
+- Codes and service names are printed on the screen
+
+    '
+
+    exit
+}
+
+for (( i=1; i<=$#; i++ )); do
+  value=${!i}
+  j=$(( i + 1 ))
+  [[ "$value" = "--help" ]] && _help
+  [[ "${value}" = "-"* ]] && {
+    [[ "$value" =~ -.*h ]] && { _help; }
+    continue
+  }
+done
+
+which oathtool &> /dev/null || {
+  echo Missing oathtool
+  exit 1
+}
+which smenu &> /dev/null || {
+  echo Missing smenu
+  exit 1
+}
+
+timeadjust=0
+update_frequency=30
+
+shopt -s nullglob
+
+_exit() {
+  clear
+  exit
+}
+_get_code() {
+  oathtool -b --totp $( cat "$1" | tr -dc '[:print:]' )
+}
+_print_codes() {
+    echo "Refresh"
+    even=0
+    for k in *key; do
+      name=${k%.key}
+      name=${name//_/ }
+      printf "%-${PAD_LENGTH}s [ %s ] \n" \
+        "$name" \
+        $( _get_code "$k" )
+      even=$(( 1 - $even ))
+    done
+}
+
+
+while true; do
+    clear
+    PAD_LENGTH=0
+    for key in *key; do
+      name=${key%.key}
+      if [[ ${#name} -gt $PAD_LENGTH ]]; then
+        PAD_LENGTH=${#name}
+      fi
+    done
+
+    set -e
+    new_codes=$( _print_codes )
+    set +e
+    codes=$new_codes
+    i=$(( ( $( date +%s ) - $timeadjust ) % $update_frequency ))
+    left=$(( $update_frequency - $i ))
+    when=$( date -d "now + $left seconds" +"%H:%M:%S" )
+    selected=$( echo -e "$codes" | smenu \
+        -M -m "Codes change in ${left}s at $when" -W $'\n' \
+        -t 1 -n 30 -a c:0/2 i:3 \
+    )
+
+    if [[ -z "$selected" ]]; then
+      exit
+    fi
+    if [[ "$selected" = "Refresh" ]]; then
+       continue
+    fi
+    code=$( echo "$selected" | rev | cut -d" " -f2 | rev )
+    echo Copying $code to clipboard
+    echo -n $code | xclip -selection clipboard 2> /dev/null
+    echo -n $code | xclip 2> /dev/null
+    countdown -n  15
+    exit
+done