v1.5.7: rename $_ZL_FZF_SORT to $_ZL_INT_SORT it will affect both -i and -I.

update os.path.isdir to handle windows path better

README.cn.md

@@ -250,7 +250,9 @@ PS：如果你使用 Fish shell，需要 2.7.0 以上才支持该功能。
 
 ![](images/fzf.png)
 
-当你使用 `"z -I vim"` 时，12 条路径被筛选出来，并按照 frecent 排序，他们都包含 "vim" 关键字，在实际 cd 改变路径前，z.lua 会调用 fzf 来让你更方便的选择你想去的地方，每条记录包含左边的 frecent 权重和右边的路径名，权重越高的排在越前面，你可以按回车选择，或者 ESC 退出。
+当你使用 `"z -I vim"` 时，12 条路径被筛选出来，并按照 frecent 排序，他们都包含 "vim" 关键字，在实际 cd 改变路径前，z.lua 会调用 fzf 来让你更方便的选择你想去的地方，每条记录包含左边的 frecent 权重和右边的路径名，权重越高的排在越前面。
+
+你可以在 fzf 里输入一些**空格分隔**的关键字（不需要先后顺序），或者按 `CTRL+J` / `CTRL+K` （方向键的上下也可以）进行选择，`ESC` 或者 `CTRL`+`D`/`G` 放弃。
 
 你仍然可以用老方法，通过在 `z` 命令后面添加更多关键词来精确的匹配你想去的地方，这个特性给了你一个可视化的方式来做这件事情。为了方便起见，通常把 `z -I` alias 成 `zf` (z + fuzzy finder)。如果搜索结果只有一项，那么 z.lua 会直接跳转过去，不需要启动 fzf 再选择一遍，只有多项结果要选择时，才会启动 fzf。
 

README.md

@@ -24,7 +24,6 @@ For example, `z foo bar` would match `/foo/bar` but not `/bar/foo`.
 - Interactive selection enables you to choose where to go before cd.
 - Intergrated with FZF (optional) for interactive selection and completion.
 - Quickly go back to a parent directory instead of typing "cd ../../..".
-- Cooperate with [fz](https://github.com/changyuheng/fz) to provide better completion, see [FAQ](https://github.com/skywind3000/z.lua/wiki/FAQ#fzsh-for-better-completion).
 - Corresponding experience in different shells and operating systems. 
 - Compatible with Lua 5.1, 5.2 and 5.3+
 - Self contained, distributed as a single `z.lua` script, no other dependence.
@@ -35,7 +34,7 @@ For example, `z foo bar` would match `/foo/bar` but not `/bar/foo`.
 ```bash
 z foo       # cd to most frecent dir matching foo
 z foo bar   # cd to most frecent dir matching foo and bar
-z -r foo    # cd to highest ranked dir matching foo
+z -r foo    # cd to the highest ranked dir matching foo
 z -t foo    # cd to most recently accessed dir matching foo
 z -l foo    # list matches instead of cd
 z -c foo    # restrict matches to subdirs of $PWD
@@ -220,14 +219,14 @@ If no match is found, it will fall back to default matching method.
 
 - Skip the current directory:
 
-  when you are calling `z xxx` but the best match is the current directory, z.lua will choose the 2nd best match result for you. Assuming the database:
+  When you are calling `z xxx` but the best match is the current directory, z.lua will choose the 2nd best match result for you. Assuming the database:
 
       10   /Users/Great_Wall/.rbenv/versions/2.4.1/lib/ruby/gems
       20   /Library/Ruby/Gems/2.0.0/gems
 
   When I use `z gems` by default, it will take me to `/Library/Ruby/Gems/2.0.0/gems`, but it's not what I want, so I press up arrow and execute `z gems` again, it will take me to `/Users/Great_Wall/.rbenv/versions/2.4.1/lib/ruby/gems` and this what I want.
 
-  Of course I can always use `z env gems` to indicate what I want precisely. Skip the current directory means when you use `z xxx` you always want to change directory instead of stay in the same directory and do nothing if current directory is the best match.
+  Of course, I can always use `z env gems` to indicate what I want precisely. Skip the current directory means when you use `z xxx` you always want to change directory instead of stay in the same directory and do nothing if current directory is the best match.
 
 The default matching method is designed to be compatible with original z.sh, but the enhanced matching method is much more handy and exclusive to z.lua.
 
@@ -236,7 +235,7 @@ The default matching method is designed to be compatible with original z.sh, but
 
 By default, z.lua will add current directory to database each time before display command prompt (correspond with z.sh). But there is an option to allow z.lua add path only if current working directory changed.
 
-To enable this, you can set `$_ZL_ADD_ONCE` to `1` before init z.lua. Or you can init z.lua on linux like this:
+To enable this, you can set `$_ZL_ADD_ONCE` to `1` before init z.lua. Or you can initialize z.lua on linux like this:
 
 ````bash
 eval "$(lua /path/to/z.lua --init bash once)"
@@ -270,13 +269,15 @@ From version 1.1.0, a new option `"-I"` will allow you to use fzf to select when
 
 ![](images/fzf.png)
 
-When we use `"z -I vim"`，12 paths contains keyword "vim" has been matched and ordered by their frecent value, the higher frecent comes with the higher rank. Then without cd to the highest ranked path, z.lua passes all the candidates to fzf. And you can use fzf to select where you want to go, or ESC to quit.
+When we use `"z -I vim"`，12 paths contains keyword "vim" has been matched and ordered by their frecent value, the higher frecent comes with the higher rank. Then without cd to the highest ranked path, z.lua passes all the candidates to fzf. 
+
+Now you can input some space separated keywords (no order required) or use `CTRL+J`/`CTRL+K` (same as `UP`/`DOWN`) to select where you want to go, or `ESC` / `CTRL`+`D`/`G` to give up. 
 
 Of course, you can always give more keywords to `z` command to match your destination precisely. `"z -I"` is similar to `"z -i"`, but use fzf. Both `"-i"` and `"-I"` provide you another way for path navigation.
 
-Usually, `z -I` can be aliased to `zf` (z + fuzzy finder) for convenience. If there are only one path matched, `z -I` will jump to it directly, fzf will only be invoked for multiple matches.
+Usually, `z -I` can be aliased to `zf` (z + fuzzy finder) for convenience. If there are only one path matched, `z -I` will jump to it directly, fzf will only be invoked for multiple matches. `"z -I ."` or `"zf ."` can be used to use fzf select from entire database. 
 
-`"z -I ."` or `"zf ."` can be used to use fzf select from entire database. Environment variable `_ZL_FZF_FLAG` is for passing additional arguments to fzf.
+For more information about this, please visit [wiki - effective with fzf](https://github.com/skywind3000/z.lua/wiki/Effective-with-fzf).
 
 NOTE: For fish shell, this feature requires fish 2.7.0 or above. You can specify fzf executable in `$_ZL_FZF` environment variable, `"fzf"` will be called by default.
 
@@ -285,8 +286,8 @@ NOTE: For fish shell, this feature requires fish 2.7.0 or above. You can specify
 
 New option `"-b"` can quickly go back to a specific parent directory in bash instead of typing "cd ../../.." redundantly.
 
-- **(No argument)**: `cd` into the project root, the project root the nearest parent directory with `.git`/`.hg`/`.svn` in it
+- **(No argument)**: `cd` into the project root, the project root the nearest parent directory with `.git`/`.hg`/`.svn` in it.
-- **(One argument)**: `cd` into the closest parent starting with keyword, if not find, goto the parent containing keyword.
+- **(One argument)**: `cd` into the closest parent starting with keyword, if not find, go to the parent containing keyword.
 - **(Two arguments)**: replace the first value with the second one (in the current path).
 
 Let's start by aliasing `z -b` to `zb`:
@@ -419,7 +420,7 @@ Don't forget to read the [Frequently Asked Questions](https://github.com/skywind
 
 ## Benchmark
 
-The slowest part is adding path to history data file. It will run every time when you press enter (installed in $PROMPT_COMMAND). so I profile it on my nas:
+The slowest part is adding path to history data file. It will run every time when you press enter (installed in $PROMPT_COMMAND). So I profile it on my NAS:
 
 ```bash
 $ time autojump --add /tmp
@@ -457,6 +458,10 @@ As you see, z.lua is the fastest one and requires less resource.
 
 ## History
 
+- 1.5.7 (2019-02-21): rename `$_ZL_FZF_SORT` to `$_ZL_INT_SORT` it will affect both `-i` and `-I`.
+- 1.5.6 (2019-02-20): set `$_ZL_FZF_SORT` to 1 to sort directories by alphabet in fzf.
+- 1.5.5 (2019-02-20): `$_ZL_FZF_FLAG` can be used to override fzf flags, default to "+s -e".
+- 1.5.4 (2019-02-19): fixed: file/path existence detection fails on read-only fs (closed [#49](https://github.com/skywind3000/z.lua/issues/49) by [@contrun](https://github.com/contrun)).
 - 1.5.3 (2019-02-17): new `$_ZL_FZF_FLAG` for passing additional flags to fzf, add `-e` argument to fzf.
 - 1.5.2 (2019-02-16): be aware of all arguments in fzf completion.
 - 1.5.1 (2019-02-15): new: simulated dir stack by `z -`, `z --` and `z -{num}`.

z.lua

@@ -4,7 +4,7 @@
 -- z.lua - a cd command that learns, by skywind 2018, 2019
 -- Licensed under MIT license.
 --
--- Version 1.5.3, Last Modified: 2019/02/17 16:22
+-- Version 1.5.7, Last Modified: 2019/02/21 11:07
 --
 -- * 10x faster than fasd and autojump, 3x faster than z.sh
 -- * available for posix shells: bash, zsh, sh, ash, dash, busybox
@@ -158,6 +158,10 @@ function string:startswith(text)
 	return false
 end
 
+function string:endswith(text)
+	return text == "" or self:sub(-#text) == text
+end
+
 function string:lstrip()
 	if self == nil then return nil end
 	local s = self:gsub('^%s+', '')
@@ -418,6 +422,8 @@ end
 function os.path.isdir(pathname)
 	if pathname == '/' then
 		return true
+	elseif pathname == '' then
+		return false
 	elseif windows then
 		if pathname == '\\' then
 			return true
@@ -425,15 +431,11 @@ function os.path.isdir(pathname)
 			return true
 		end
 	end
-	local name = pathname .. '/'
+	local name = pathname
-	local ok, err, code = os.rename(name, name)
+	if (not name:endswith('/')) and (not name:endswith('\\')) then
-	if not ok then
+		name = name .. '/'
-		if code == 13 then
-			return true
-		end
-		return false
 	end
-	return true
+	return os.path.exists(name)
 end
 
 
@@ -445,6 +447,12 @@ function os.path.exists(name)
 	if not ok then
 		if code == 13 then
 			return true
+		elseif code == 30 then
+			local f = io.open(name,"r")
+			if f ~= nil then
+				io.close(f)
+				return true
+			end
 		end
 		return false
 	end
@@ -762,6 +770,10 @@ end
 -----------------------------------------------------------------------
 function os.environ(name, default)
 	local value = os.getenv(name)
+	if os.envmap ~= nil and type(os.envmap) == 'table' then
+		local t = os.envmap[name]
+		value = (t ~= nil and type(t) == 'string') and t or value
+	end
 	if value == nil then
 		return default
 	elseif type(default) == 'boolean' then
@@ -1266,13 +1278,14 @@ function z_match(patterns, method, subdir)
 	subdir = subdir ~= nil and subdir or false
 	local M = data_load(DATA_FILE)
 	M = data_select(M, patterns, false)
+	M = data_filter(M)
 	if Z_MATCHNAME then
 		local N = data_select(M, patterns, true)
+		N = data_filter(N)
 		if #N > 0 then
 			M = N
 		end
 	end
-	M = data_filter(M)
 	M = data_update_frecent(M)
 	if method == 'time' then
 		current = os.time()
@@ -1325,7 +1338,7 @@ end
 -----------------------------------------------------------------------
 function z_print(M, weight, number)
 	local N = {}
-	local maxsize = 10
+	local maxsize = 9
 	local numsize = string.len(tostring(#M))
 	for _, item in pairs(M) do
 		local record = {}
@@ -1418,6 +1431,9 @@ function z_cd(patterns)
 	elseif Z_INTERACTIVE == 0 then
 		return M[1].name
 	end
+	if os.environ('_ZL_INT_SORT', false) then
+		table.sort(M, function (a, b) return a.name < b.name end)
+	end
 	local retval = nil
 	if Z_INTERACTIVE == 1 then
 		PRINT_MODE = '<stderr>'
@@ -1439,9 +1455,10 @@ function z_cd(patterns)
 	elseif Z_INTERACTIVE == 2 then
 		local fzf = os.environ('_ZL_FZF', 'fzf')
 		local tmpname = '/tmp/zlua.txt'
-		local cmd = '--nth 2.. --reverse --inline-info +s --tac -e'
+		local cmd = '--nth 2.. --reverse --inline-info --tac '
-		cmd = ((fzf == '') and 'fzf' or fzf)  .. ' ' .. cmd
+		local flag = os.environ('_ZL_FZF_FLAG', '')
-		cmd = cmd .. ' ' .. os.environ('_ZL_FZF_FLAG', '') .. ' '
+		flag = (flag == '' or flag == nil) and '+s -e' or flag
+		cmd = ((fzf == '') and 'fzf' or fzf)  .. ' ' .. cmd .. ' ' .. flag
 		if not windows then
 			tmpname = os.tmpname()
 			if not os.environ('_ZL_FZF_FULLSCR', false) then
@@ -1987,11 +2004,13 @@ function z_shell_init(opts)
 		end
 		print(script_complete_bash)
 		if opts.fzf ~= nil then
-			fzf_cmd = "fzf --nth 2 --reverse --inline-info +s --tac -e"
+			fzf_cmd = "fzf --nth 2.. --reverse --inline-info --tac "
 			if not os.environ('_ZL_FZF_FULLSCR', false) then
 				fzf_cmd = fzf_cmd .. ' --height 35%'
 			end
-			fzf_cmd = fzf_cmd .. ' ' .. os.environ('_ZL_FZF_FLAG', '') .. ' '
+			local flag = os.environ('_ZL_FZF_FLAG', '')
+			flag = (flag == '' or flag == nil) and '+s -e' or flag
+			fzf_cmd = fzf_cmd .. ' ' .. flag .. ' '
 			print('zlua_fzf="' .. fzf_cmd .. '"')
 			print(script_fzf_complete_bash)
 		end