diff --git a/bash/ext b/bash/ext
index 729f5ce..16221bf 100644
--- a/bash/ext
+++ b/bash/ext
@@ -1,106 +1,36 @@
 # Make Bash more like Zsh
 
 
-## Hooks
-# https://zsh.sourceforge.io/Doc/Release/Functions.html#Hook-Functions
+# Hooks
+# derived from http://glyf.livejournal.com/63106.html
 
 # TODO: support precmd_functions and chpwd_functions arrays
 
-### Defaults: NOOPs
-
+# default: NOOPs
 function preexec { :; }
-
 function precmd  { :; }
-
 function chpwd   { :; }
 
-### Implementations
-
-# Alternative cd function that calls chpwd afterwards builtin cd
-#
-# zsh: Executed whenever the current working directory is changed.
 __cd_invoke_chpwd() {
     builtin cd "$@"
-
     chpwd
-
-    # TODO: chpwd_functions array
 }
 
-# zsh: Executed before each prompt. Note that precommand functions are not
-#      re-executed simply because the command line is redrawn, as happens, for
-#      example, when a notification about an exiting job is displayed.
-__prompt_command_invoke_precmd() {
-    precmd
-
-    # TODO: precmd_functions array
-}
-
-# to properly trigger only before command exec this must be the last prompt command
-__prompt_command_hook_preexec() {
-    trap '__debug_invoke_preexec' DEBUG
-}
-
-__prompt_command_unhook_preexec() {
-    # Unfortunately there's no way to remove just one trap from a signal
-    trap - DEBUG
-}
-
-# zsh: Executed just after a command has been read and is about to be executed. If
-#      the history mechanism is active (regardless of whether the line was discarded
-#      from the history buffer), the string that the user typed is passed as the
-#      first argument, otherwise it is an empty string. The actual command that will
-#      be executed (including expanded aliases) is passed in two different forms:
-#      the second argument is a single-line, size-limited version of the command
-#      (with things like function bodies elided); the third argument contains the
-#      full text that is being executed.
-__debug_invoke_preexec () {
-    # somehow PROMPT_COMMAND contents seems to be still affected by the
-    # just-removed trap. Ignore ours.
-    [[ "$BASH_COMMAND" == "__prompt_command_unhook_preexec" ]] && return
-    [[ "$BASH_COMMAND" == "__prompt_command_invoke_precmd" ]] && return
-    [[ "$BASH_COMMAND" == "__prompt_command_hook_preexec" ]] && return
-
-    # TODO: not sure this is still necessary
-    [[ -n "$COMP_LINE" ]] && return  # completion
-
+__preexec_invoke_exec () {
     local this_command;
 
-    # TODO: hack: doesn't work when command is not added to history
+    [ -n "$COMP_LINE" ] && return  # completion
+    [ "$BASH_COMMAND" = "$PROMPT_COMMAND" ] && return  # precmd
+
     this_command=`history 1 | sed -e "s/^[ ]*[0-9]*[ ]*//g"`;
     preexec "$this_command"
 }
 
-### Set up the hooks
-
-# Define a function to override the cd builtin
-#
-# - does not apply to `bash -c 'cd foo`
-# - does apply to shubshells: `(cd foo)` will call so side effects beware (env
-#   vars are conveniently scoped to subshell)
+# set up the hooks
+PROMPT_COMMAND="precmd"
+trap '__preexec_invoke_exec' DEBUG
 cd() { __cd_invoke_chpwd "$@"; }
 
-# Call on each prompt. This transitively sets preexec to work for each prompt
-#
-# PROMPT_COMMAND is evaluated right before PS1 is displayed. This matches zsh
-# semantics for precmd.
-#
-# We forcefully set it instead of taking whatever was set:
-# - to control order (precmd eval + preexec hooking must be last)
-# - because of the trap issue
-PROMPT_COMMAND=(
-    # this also conveniently clears DEBUG traps
-    __prompt_command_unhook_preexec
-
-    # precmd hook processing
-    __prompt_command_invoke_precmd
-
-    # must be last to properly have DEBUG trigger only before command exec
-    __prompt_command_hook_preexec
-)
-
-
-## Other bits
 
 # clears a line that was not terminated by a LF fixing the dangling prompt
 # issue by marking it with a reversed %, like zsh
diff --git a/bash/kitty b/bash/kitty
index 684ba21..f0b6b07 100644
--- a/bash/kitty
+++ b/bash/kitty
@@ -1,5 +1,5 @@
-# if test -n "$KITTY_INSTALLATION_DIR"; then
-#   export KITTY_SHELL_INTEGRATION="enabled"
-#   source "$KITTY_INSTALLATION_DIR/shell-integration/bash/kitty.bash"
-# fi
+if test -n "$KITTY_INSTALLATION_DIR"; then
+  export KITTY_SHELL_INTEGRATION="enabled"
+  source "$KITTY_INSTALLATION_DIR/shell-integration/bash/kitty.bash"
+fi
 
diff --git a/zsh/kitty b/zsh/kitty
index 8165ed7..5b9ae5f 100644
--- a/zsh/kitty
+++ b/zsh/kitty
@@ -1,6 +1,6 @@
-# if test -n "$KITTY_INSTALLATION_DIR"; then
-#   export KITTY_SHELL_INTEGRATION="enabled"
-#   autoload -Uz -- "$KITTY_INSTALLATION_DIR"/shell-integration/zsh/kitty-integration
-#   kitty-integration
-#   unfunction kitty-integration
-# fi
+if test -n "$KITTY_INSTALLATION_DIR"; then
+  export KITTY_SHELL_INTEGRATION="enabled"
+  autoload -Uz -- "$KITTY_INSTALLATION_DIR"/shell-integration/zsh/kitty-integration
+  kitty-integration
+  unfunction kitty-integration
+fi