update path calculation

README.md

@@ -67,6 +67,17 @@ z -e foo    # echo the best match, don't cd
 - set `$_ZL_NO_PROMPT_COMMAND` if you're handling PROMPT_COMMAND yourself.
 - set `$_ZL_EXCLUDE_DIRS` to an array of directories to exclude.
 
+
+
 ## Credit
 
-Licensed under MIT license.
+Releated projects:
+
+- [rupa/z](https://github.com/rupa/z): origin z.sh implementation
+- [JannesMeyer/z.ps](https://github.com/JannesMeyer/z.ps): z for powershell
+
+
+## License
+
+Licensed under MIT license.
+

z.lua

@@ -607,15 +607,12 @@ function data_save(filename, M)
 		fp = io.open(filename, 'w')
 	else
 		math.random_init()
-		tmpname = filename .. '.' .. math.random_string(8)
-		tmpname = tmpname .. tostring(os.time())
-		local rnd = os.getenv('_ZL_RANDOM')
-		if rnd ~= nil then
-			tmpname = tmpname .. '' ..rnd
-		end
+		tmpname = filename .. '.' .. math.random_string(6)
 		local sub = (os.tmpname()):sub(-6, -1):gsub('[\\/:~]', '')
-		local ppid = os.getenv('PPID')
-		tmpname = tmpname .. sub .. (ppid and ppid or '')
+		tmpname = tmpname .. sub .. tostring(os.time())
+		local rnd = os.getenv('_ZL_RANDOM')
+		tmpname = tmpname .. '' .. (rnd and rnd or '')
+		-- print('tmpname: '..tmpname)
 		fp = io.open(tmpname, 'w')
 	end
 	if fp == nil then