update doc

README.md

@@ -458,6 +458,8 @@ As you see, z.lua is the fastest one and requires less resource.
 
 ## History
 
+- 1.5.11 (2019-03-02): fixed: os.path.isdir doesn't work for symbol link folders.
+- 1.5.10 (2019-03-01): Prevent writing file racing.
 - 1.5.9 (2019-02-25): `z -b` should not match current directory (close #56).
 - 1.5.8 (2019-02-21): new `$_ZL_FZF_HEIGHT` to control `--height` parameter in fzf.
 - 1.5.7 (2019-02-21): rename `$_ZL_FZF_SORT` to `$_ZL_INT_SORT` it will affect both `-i` and `-I`.
@@ -492,6 +494,7 @@ As you see, z.lua is the fastest one and requires less resource.
 
 This project needs help for the tasks below:
 
+- [ ] Support csh/tcsh.
 - [ ] Completion: Actually I got little knowledge in completion, and need help to improve it.
 - [ ] Completion: Implement completion for Power Shell.
 - [ ] Completion: Implement completion for different arguments.

z.lua

@@ -4,7 +4,7 @@
 -- z.lua - a cd command that learns, by skywind 2018, 2019
 -- Licensed under MIT license.
 --
--- Version 1.5.9, Last Modified: 2019/02/25 23:17
+-- Version 1.5.11, Last Modified: 2019/03/02 11:37
 --
 -- * 10x faster than fasd and autojump, 3x faster than z.sh
 -- * available for posix shells: bash, zsh, sh, ash, dash, busybox
@@ -427,8 +427,6 @@ function os.path.isdir(pathname)
 	elseif windows then
 		if pathname == '\\' then
 			return true
-		elseif pathname:match('^%a:[/\\]$') then
-			return true
 		end
 	end
 	local name = pathname
@@ -453,6 +451,12 @@ function os.path.exists(name)
 				io.close(f)
 				return true
 			end
+		elseif name:sub(-1) == '/' and code == 20 and (not windows) then
+			local test = name .. '.'
+			ok, err, code = os.rename(test, test)
+			if code == 16 or code == 13 or code == 22 then
+				return true
+			end
 		end
 		return false
 	end
@@ -960,11 +964,16 @@ function data_save(filename, M)
 		fp = io.open(filename, 'w')
 	else
 		math.random_init()
-		tmpname = filename .. '.' .. tostring(os.time())
-		tmpname = tmpname .. math.random_string(8)
-		local rnd = os.getenv('_ZL_RANDOM')
-		tmpname = tmpname .. '' .. (rnd and rnd or '')
-		-- print('tmpname: '..tmpname)
+		while true do
+			tmpname = filename .. '.' .. tostring(os.time())
+			tmpname = tmpname .. math.random_string(8)
+			local rnd = os.getenv('_ZL_RANDOM')
+			tmpname = tmpname .. '' .. (rnd and rnd or '')
+			if not os.path.exists(tmpname) then
+				-- print('tmpname: '..tmpname)
+				break
+			end
+		end
 		fp = io.open(tmpname, 'w')
 	end
 	if fp == nil then