more refinement

tmux/.is_vim.sh

@@ -4,20 +4,18 @@
 tty=$1
 
 # Construct process tree.
-children=();
-pids=( $(ps -o pid= -t $tty) )
+children=()
+pids=($(ps -o pid= -t $tty))
 
-while read -r pid ppid
-do
-  [[ -n pid && pid -ne ppid ]] && children[ppid]+=" $pid"
-done <<< "$(ps -Ao pid=,ppid=)"
+while read -r pid ppid; do
+    [[ -n $pid && $pid -ne $ppid ]] && children[ppid]+=" $pid"
+done <<<"$(ps -Ao pid=,ppid=)"
 
 # Get all descendant pids of processes in $tty with BFS
 idx=0
-while (( ${#pids[@]} > idx ))
-do
-  pid=${pids[idx++]}
-  pids+=( ${children[pid]-} )
+while ((${#pids[@]} > idx)); do
+    pid=${pids[idx++]}
+    pids+=(${children[pid]-})
 done
 
 # Check whether any child pids are vim