add bulk rename script

scripts/br.nix

@@ -0,0 +1,48 @@
+{ config, pkgs, lib, ... }:
+pkgs.writeScriptBin "br" ''
+  set -e -u
+
+  end(){
+      rm -r -- "$(dirname -- "$namebase")"
+      [ $# -ne 0 ] && echo $@ >&2
+      exit $#
+  }
+
+  if [ $# -ne 0 ] ; then
+      for i in "$@" ; do
+          printf "%s\n" "$i"
+      done  | "$0"
+      exit $?
+  fi
+
+  namebase="$(mktemp -d)/blkrn"
+  echo '# Modify filenames without removing any line, quitting aborts' \
+      > "$namebase.2"
+  tee -- "$namebase.1" >> "$namebase.2"
+  exec </dev/tty >/dev/tty ||
+      end 'Interactive terminal needed'
+
+  "$EDITOR" -- "$namebase.2"
+  sed -i -- '1d' "$namebase.2"
+
+  ! diff -- "$namebase.1" "$namebase.2" &> /dev/null || end "no changes"
+  [ `wc -l < "$namebase.1"` -eq `wc -l < "$namebase.2"` ] || end "Wrong number of lines"
+
+  {
+      echo '# Please review/modify this script or empty it to do nothing'
+      echo 'run(){'
+      echo '    mkdir -p "$(dirname "$2")"'
+      echo '    mv -T -- "$1" "$2"'
+      echo '}'
+      while read -r l1 <&3 && read -r l2 <&4; do
+          [ "$l1" = "$l2" ] || printf "%s\n%s\n" "$l1" "$l2"
+      done 3<"$namebase.1" 4<"$namebase.2" |
+      sed 's/\([\\"$`]\)/\\\1/g;s/^.*$/"&"/' |
+      xargs -d"\n" -L2 echo 'run'
+  } > "$namebase.sh"
+
+  "$EDITOR" -- "$namebase.sh"
+  sh -e -- "$namebase.sh"
+
+  end # exit normaly
+''

scripts/default.nix

@@ -7,4 +7,5 @@
   wpass = import ./wpass.nix { inherit config pkgs lib; };
   screenshotsh = import ./screenshotsh.nix { inherit config pkgs lib; };
   _gpg-unlock = import ./_gpg-unlock.nix { inherit config pkgs lib; };
+  br = import ./br.nix { inherit config pkgs lib; };
 })

user/home.nix

@@ -41,6 +41,7 @@ in {
     fd
     _diffr
     kak-pager
+    br # bulk rename
     # text manipulation
     sd
     ripgrep