rdrg

#!/usr/bin/env bash

# purpose: grep .rdu or .rdua file (see %~dp0rdgen ) for reg value (name or
#    data) or key(name), showing in output all prior values and associated
#    key.

die() { printf %s "${@+$@$'\n'}" 1>&2 ; exit 1 ; }

join () {  # https://stackoverflow.com/a/53839647
   local IFS="$1" ; shift
   shift
   echo "$*"  # this doesn't seem to work with pattern'ish $1 values (such as we're using here)
   }

join () {  # https://stackoverflow.com/a/53839433  #3 gets the job done (I have another impl somewhere, but not sure it won't face the same "pattern'ish value" issues
   local dd="$1" ; shift
   local delim=""
   local joined=""
   for item in "${@}"; do
      joined="$joined$delim$item"
      delim="$dd"
   done
   echo "$joined"
   }

# sample use of rg to capture (only) the regdump key of a matching value
# value sought: "TransparentKeyPassthrough"="Remote"

# $ rg -UNB1 --context-separator "" --multiline-dotall '^\[HKEY_[^\[]+Transparent[^\n]+Remote' rd.u16
#
# [HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Virtual Channel
# s\Keyboard]
# "AlwaysSendPrintScreen"=""
# "EchoShiftKeys"="*"
# "KeyboardTimer"="*"
# "KeyboardLayout"=""
# "KeyboardType"=""
# "KeyboardSendLocale"="*"
# "KeyboardForceLEDUpdate"="*"
# "KeyboardMappingFile"=""
# "LocalIME"=""
# "ScancodeEnabled"="*"
# "TransparentKeyPassthrough"="Remote"
#
#
# [HKEY_USERS\S-1-5-21-2096284833-3401019737-2128148655-1001\Software\Citrix\ICAClient\Engine\Lockdown Profiles\All Region
# s\Lockdown\Virtual Channels\Keyboard]
# "TransparentKeyPassthrough"="Remote"
#
# kg@DESKTOP-2JBV3IO MINGW64 ~/my/repos/winscripts (master)

# gaps in above:
# - there are 2 matches, but uniform separation is lacking.
#   * w/o -B1, there is no gap in rg output separating the two
#   * w/  -B1, the blank line which precedes every HK... line is displayed,
#              which serves as an rg separator.  Unfortunately, the rg
#              separator "--" is also injected (on its own line).  Adding
#              --context-separator "" turns the rg context-separator into a
#              blank line (therefore matches are separated by 2 blank lines,
#              with the first match being preceded by 1 blank line).
#
#              This seems to be the best we can do: replacing -B1 with -C0
#              (in hopes of having a context-separator line shown w/o any
#              source-file context lines) causes no context-separator lines
#              at all to be generates.
#
# - shows "value-name"="value-data" lines which just happen to lie beween HK... line and the matching line

# rg --help

fnm="$1" ; shift
ifs='[^\n]+'                 # ; echo "ifs=$ifs"
pat="$(join "$ifs" "${@}")"  # ; echo "pat=$pat"
# set -x
rg --multiline --multiline-dotall --no-line-number --before-context 1 --context-separator "" '^\[HKEY_[^\[]+'"$pat" "$fnm"