list processes using venv

shell/useve-runner

@@ -21,6 +21,7 @@ function useve() {
     - up [env]    upgrade packages listed in requirements.txt
     - reinstall [env] reinstall env using requirements.txt
     - freeze [env] make a list of installed packages in freeze.txt
+    - ps [env]    list processes using binaries in env
 
 Additional command: useve-runner [env] python_script.py
 or as hashbang: #!/usr/bin/env -S useve-runner [env]
@@ -207,6 +208,15 @@ or as hashbang: #!/usr/bin/env -S useve-runner [env]
             test -d "$VENV_HOME"/"$1"
             return $?
         ;;
+        ps)
+            if [[ -z "$1" ]]; then return 1; fi
+            local useve_pids
+            useve_pids=$( pgrep -f $( realpath "$VENV_HOME/$1" ) -u $( id -u ) )
+            if [[ -z "$useve_pids" ]]; then return 0; fi
+            ps -w -p $useve_pids
+
+            return 1
+        ;;
         *)
             if [[ -d "$VENV_HOME"/"$CMD" ]]; then
                 . "$VENV_HOME"/"$CMD"/bin/activate