zsh: update

.config/zsh/lib/pswalk.zsh

@@ -1,10 +1,28 @@
 #!/bin/zsh
 
+z-proc-exists() {
+    [ -n "${1:?}" ]
+
+    while [ -n "${ZSHU[procfs]}" ] ; do
+        [ -d "${ZSHU[procfs]}" ] || return 1
+        [ -f "${ZSHU[procfs]}/$1/status" ]
+        return $?
+    done
+
+    ps -o 'pid=' -p "$1" >/dev/null 2>&1
+}
+
 typeset -Uga ZSHU_PARENTS_PID
 typeset -ga ZSHU_PARENTS_NAME
 
 function {
-    local i c g
+    local procfs
+    while [ -n "${ZSHU[procfs]}" ] ; do
+        [ -d "${ZSHU[procfs]}" ] || break
+        procfs=1 ; break
+    done
+
+    local i c x _unused
 
     i=${PPID}
     while : ; do
@@ -13,8 +31,32 @@ function {
         [ "$i" = 1 ] && break
 
         ZSHU_PARENTS_PID+=( $i )
-        read -r i c g <<< $(ps -o 'ppid=,comm=' -p "$i" 2>/dev/null)
+
+        c=
+        while [ "${procfs}" = 1 ] ; do
+            [ -f "${ZSHU[procfs]}/$i/cmdline" ] || break
+            read -d $'\0' -rs c <<< $(cat "${ZSHU[procfs]}/$i/cmdline")
+            break
+        done
+        if [ -z "$c" ] ; then
+            read -rs c _unused <<< "$(ps -o 'comm=' -p "$i" 2>/dev/null)"
+        fi
         [ -n "$c" ] && ZSHU_PARENTS_NAME+=( "${c:t}" )
+
+        x=
+        while [ "${procfs}" = 1 ] ; do
+            [ -f "${ZSHU[procfs]}/$i/status" ] || break
+            # read -rs _unused x <<< "$(cat "${ZSHU[procfs]}/$i/status" | grep -F 'PPid:')"
+            while read -rs _unused c ; do
+                [ "${_unused}" = 'PPid:' ] || continue
+                x=$c ; break
+            done < "${ZSHU[procfs]}/$i/status"
+            break
+        done
+        if [ -z "$x" ] ; then
+            read -rs x _unused <<< "$(ps -o 'ppid=' -p "$i" 2>/dev/null)"
+        fi
+        i=$x
     done
 
     typeset -r ZSHU_PARENTS_PID ZSHU_PARENTS_NAME