T34: prompts and commands carry OSC 133 marks: the tap reads every OSC body and hands 133's marks to the session, which keeps its last command's status; zsh, bash, fish and PowerShell mark what the shell leaves unmarked, and the user's prompt still sees the status

assets/shell-integration/zsh/.zshenv

@@ -1,4 +1,4 @@
-# ELYTerminal: restore ZDOTDIR, load the user's .zshenv, report folder and title.
+# ELYTerminal: restore ZDOTDIR, load the user's .zshenv, report folder and title, mark prompts and commands.
 if [[ -n "${ELY_ZSH_ZDOTDIR+set}" ]]; then
   ZDOTDIR=$ELY_ZSH_ZDOTDIR
   builtin unset ELY_ZSH_ZDOTDIR
@@ -7,8 +7,13 @@ else
 fi
 [[ -r "${ZDOTDIR:-$HOME}/.zshenv" ]] && builtin source "${ZDOTDIR:-$HOME}/.zshenv"
 if [[ -o interactive ]]; then
+  _ely_ran=
   _ely_precmd() {
     builtin local ret=$? LC_ALL=C char url=
+    if [[ -n $_ely_ran ]]; then
+      builtin printf '\e]133;D;%s\a' $ret
+      _ely_ran=
+    fi
     for char in ${(s::)PWD}; do
       case $char in
         [[:cntrl:]]|%) builtin printf -v char '%%%02X' "'$char" ;;
@@ -16,12 +21,21 @@ if [[ -o interactive ]]; then
       url+=$char
     done
     builtin printf '\e]7;file://%s\a\e]2;%s\a' "$url" "${${${PWD:t}:-/}//[[:cntrl:]]/}"
+    # Themes set PS1 in later hooks; from the next prompt the marks go on after them.
+    precmd_functions=(${precmd_functions:#_ely_mark} _ely_mark)
     builtin return ret
   }
+  _ely_mark() {
+    if [[ -o prompt_percent && $PS1 != *$'\e]133;A'* ]]; then
+      PS1=$'%{\e]133;A\a%}'$PS1$'%{\e]133;B\a%}'
+    fi
+  }
   _ely_preexec() {
-    builtin printf '\e]2;%s\a' "${1//[[:cntrl:]]/}"
+    _ely_ran=1
+    builtin printf '\e]133;C\a\e]2;%s\a' "${1//[[:cntrl:]]/}"
   }
   builtin autoload -Uz add-zsh-hook
   add-zsh-hook precmd _ely_precmd
+  add-zsh-hook precmd _ely_mark
   add-zsh-hook preexec _ely_preexec
 fi