winupdtuserpath

#!/usr/bin/env bash

# purpose: ensure that any dirs named in $homePathsToAdd _that exist_ are in User PATH stored in registry
#          any missing from User PATH stored in registry are added using Windows-specific SETX command

homePathsToAdd=(  # all elements are considered RELATIVE to $HOME !!!
   "my/repos/winscripts"
   "my/repos/shell"
   "my/repos/k_edit"
   "my/bin"
   # "my/bin/Calibre Portable/Calibre"      # only needed for one use, see %~dp0ep function find_ec_binary adequate locally-scoped solution
   # "AppData/Local/Microsoft/WindowsApps"  # test only (exists in User PATH stored in registry by default)
   )

regval() ( key="$1" valnm="$2"
   reg query "$key" //v "$valnm" | perl -lne '/^\s+'"$valnm"'\s+REG\S+\s+(\S.*)$/ && print $1'
   )

rawUserPath() ( regval "HKCU\Environment" "Path" )
rawSysPath()  ( regval "HKLM\System\CurrentControlSet\Control\Session Manager\Environment" "Path" )

winPathToLines() ( echo "$1" | perl -lne 'print join("\n", split(";",$_))' )  # convert

userpathbefore="$(rawUserPath)"

if false; then
   echo "userpathbefore=$userpathbefore"
   winPathToLines "$userpathbefore"

   echo "system"
   winPathToLines "$(rawSysPath)"
fi

winPathsToAdd=""
for hpath in "${homePathsToAdd[@]}"; do
   echo "$hpath"
   if [[ -d "$HOME/$hpath" ]]; then
      winpath='%USERPROFILE%'"\\$(cygpath -w "$hpath")"
      echo "$hpath -> $winpath"
      # repeated calls to winPathToLines is inefficient, but avoids use of a tempfile (and we don't run this script very often...)
      if winPathToLines "$userpathbefore" | grep -qP '^\Q'"$winpath"'\E$'; then
         : # echo "skipping $winpath"
      else
         winPathsToAdd+=";$winpath"
      fi
   fi
done

echo
echo "winPathsToAdd=$winPathsToAdd"

if [[ "$winPathsToAdd" ]]; then
   echo
   newuserpath="$(echo "$userpathbefore$winPathsToAdd" | perl -pe 's/;+/;/g')"
   # echo "newuserpath=$newuserpath"
   echo "setx PATH=$newuserpath"
   setx "PATH" "$newuserpath"
fi