Automatic title: Replace fg with description from jobs

lib/termsupport.zsh

@@ -72,7 +72,19 @@ function omz_termsupport_preexec {
   local CMD=${1[(wr)^(*=*|sudo|ssh|mosh|rake|-*)]:gs/%/%%}
   local LINE="${2:gs/%/%%}"
 
-  title '$CMD' '%100>...>$LINE%<<'
+  if [[ "$CMD" = fg ]]; then
+    # replace fg, possibly with argument, with description from jobs
+    local JOB
+    if [[ ${(z)1} = fg ]]; then # no arguments
+      JOB="$(jobs %%)"
+    else # arguments
+      JOB="$(jobs ${${(z)1}[2]})"
+    fi
+    JOB="${${(z)JOB}[4,$]}" # trim job number, +, pid, status
+    title ${JOB:gs/%/%%} ${JOB:gs/%/%%}
+  else
+    title '$CMD' '%100>...>$LINE%<<'
+  fi
 }
 
 precmd_functions+=(omz_termsupport_precmd)