[Search processes] add gif and shorten field name for ppid to PARENT

Author: PatrickF1

README.md

@@ -60,6 +60,8 @@ Use `fzf.fish` to interactively find and insert the shell entities listed below
 
 ### Process ids
 
+![gif processes](images/processes.gif)
+
 - **Search input:** the pid and command of all running processes, outputted by `ps`
 - **Key binding and mnemonic:** <kbd>Ctrl</kbd>+<kbd>Alt</kbd>+<kbd>P</kbd> (`P` for process)
 - **Preview window:** the CPU usage, memory usage, start time, and other information about the process

functions/_fzf_search_processes.fish

@@ -1,7 +1,7 @@
 function _fzf_search_processes --description "Search all running processes. Replace the current token with the pid of the selected process."
     # use all caps to be consistent with ps default format
     # snake_case because ps doesn't seem to allow spaces in the field names
-    set ps_preview_fmt (string join ',' 'pid' 'ppid=PARENT_PID' 'user' '%cpu' 'rss=RSS_IN_KB' 'start=START_TIME' 'command')
+    set ps_preview_fmt (string join ',' 'pid' 'ppid=PARENT' 'user' '%cpu' 'rss=RSS_IN_KB' 'start=START_TIME' 'command')
     set processes_selected (
         ps -A -opid,command | \
         _fzf_wrapper --multi \