Utils

ya

`hide()`

Hide Yazi to the secondary screen by returning to the terminal, completely controlled by the requested plugin.

local permit = ya.hide()

This method returns a permit for this resource. When it's necessary to restore the TUI display, call its drop() method:

permit:drop()

Note that since there's always only one available terminal control resource, ya.hide() cannot be called again before the previous permit is dropped, otherwise an error will be thrown, effectively avoiding deadlocks.

This function is only available in the async context.

`file_cache(opts)`

Calculate the cached Url corresponding to the given file:

opts - Required, the options of the cache, which is a table:
- file - The File to be cached
- skip - The number of units to skip. It's units largely depend on your previewer, such as lines for code, and percentages for videos

If the file is not allowed to be cached, such as it's ignored in the user config, or the file itself is a cache, returns nil.

`manager_emit(cmd, args)`

Send a command to the [manager] without waiting for the executor to execute:

cmd - Required, the command name, which is a string
args - Required, the arguments of the command, which is a table with a number or string key and sendable values

ya.manager_emit("my-cmd", { "hello", 123, foo = true, bar_baz = "world" })

-- Equivalent to:
-- my-cmd "hello" "123" --foo --bar-baz="world"

`image_show(url, rect)`

Display the given image within the specified area, and the image will downscale to fit that area automatically:

url - Required, the Url of the image
rect - Required, the Rect of the area

This function is only available in the async context.

`image_precache(src, dist)`

Pre-cache the image to a specified url based on user-configured max_width and max_height:

src - Required, the source Url of the image
dist - Required, the destination Url of the image

This function is only available in the async context.

`which(opts)`

Prompt users with a set of available keys:

opts: Required, the options of the prompt, which is a table:
- cands: Required, the key candidates, which is a table of tables that contains the following fields:
  - on: Required, the key to be prompted, which is a string or a table of strings if multiple keys
  - desc: Optional, the description of the key, which is a string
- silent: Optional, whether to show the UI of key indicator, which is a boolean

local cand = ya.which {
	cands = {
		{ on = "a" },
		{ on = "b", desc = "optional description" },
		{ on = "<C-c>", desc = "key combination" },
		{ on = { "d", "e" }, desc = "multiple keys" },
	},
	-- silent = true, -- If you don't want to show the UI of key indicator
}

When the user clicks a valid candidate, ya.which returns the 1-based index of that cand; otherwise, it returns nil, indicating that the user has canceled the key operation.

This function is only available in the async context.

`input(opts)`

Request user input:

opts: Required, the options of the input, which is a table:
- title: Required, the title of the input, which is a string.
- value: Optional, the default value of the input, which is a string.
- position: Required, the position of the input, which is a table:
  - 1: Required, the origin position of the input, which is a string accepts "top-left", "top-center", "top-right", "bottom-left", "bottom-center", "bottom-right", "center", and "hovered".
  - x: Optional, the X offset from the origin position, which is an positive or negative integer.
  - y: Optional, the Y offset from the origin position, which is an positive or negative integer.
  - w: Required, the width of the input, which is an positive integer.
  - h: Optional, the height of the input, which is an positive integer.
- realtime: Optional, whether to report user input in real time, which is a boolean.
- debounce: Optional, the number of seconds to wait for the user to stop typing, which is a positive float. Can only be used when realtime = true. (Currently needs the nightly version of Yazi)

local value, event = ya.input {
	title = "Archive name:",
	position = { "top-center", y = 3, w = 40 },
}

Returns (value, event):

value - The user input value carried by this event, which is a string if the event is non-zero; otherwise, nil.
event - The event type, which is an integer:
- 0: Unknown error.
- 1: The user has confirmed the input.
- 2: The user has canceled the input.
- 3: The user has changed the input (only if realtime is true).

When realtime = true specified, ya.input() returns a receiver, which has a recv() method that can be called multiple times to receive events.

local input = ya.input {
	title = "Input in realtime:",
	position = { "center", w = 50 },
	realtime = true,
}

while true do
	local value, event = input:recv()
	if not value then
		break
	end

	ya.err(value)
end

This function is only available in the async context.

`notify(opts)`

Send a foreground notification to the user:

opts: Required, the options of the notification, which is a table:
- title: Required, the title of the notification, which is a string.
- content: Required, the content of the notification, which is a string.
- timeout: Required, the timeout of the notification, which is an non-negative float in seconds.
- level: Optional, the level of the notification, which is a string accepts "info", "warn", and "error". Default is "info".

ya.notify {
	title = "Hello, World!",
	content = "This is a notification from Lua!",
	timeout = 6.5,
	-- level = "info",
}

`dbg(msg, ...)`

Append messages to the log file at the debug level:

msg - Required, the message to be logged.

ya.dbg("Hello", "World!")                       -- Multiple arguments are supported
ya.dbg({ foo = "bar", baz = 123, qux = true })  -- Any type of data is supported

Note that if you use a release build of Yazi, the log level is "error" instead of "debug", so you'll need to use ya.err.

`err(msg, ...)`

Append messages to the log file at the error level:

msg - Required, the message to be logged.

ya.err("Hello", "World!")                       -- Multiple arguments are supported
ya.err({ foo = "bar", baz = 123, qux = true })  -- Any type of data is supported

`sync(fn)`

See Async context.

`preview_code(opts)`

Preview the file as code into the specified area:

opts - Required, the options of the preview, which is a table:
- file - The previewed File
- area - The area of the preview, which is a Rect
- skip - The number of units to skip. It's units largely depend on your previewer, such as lines for code, and percentages for videos
- window - The Window of the preview

Returns (ok, upper_bound):

ok - Whether the preview is successful, which is a boolean.
upper_bound - If the preview fails (ok = false) and it's because exceeds the maximum upper bound, return this bound; otherwise, nil.

This function is only available in the async context.

`preview_archive(opts)`

Preview the file as an archive into the specified area:

opts - Required, the options of the preview. It's the same as preview_code()

Returns (ok, upper_bound):

ok - Whether the preview is successful, which is a boolean.
upper_bound - If the preview fails (ok = false) and it's because exceeds the maximum upper bound, return this bound; otherwise, nil.

This function is only available in the async context.

`preview_widgets(opts, widgets)`

opts - Required, the options of the preview, which is a table:
- file - The previewed File
- skip - The number of units to skip. It's units largely depend on your previewer, such as lines for code, and percentages for videos
- window - The Window of the preview
widgets - List of renderable widgets, such as { ui.Paragraph {...}, ui.List {...}, ... }

This function is only available in the async context.

`target_family()`

Returns the target family of the current platform, "windows", "unix", or "wasm".

`quote(str)`

Quote characters that may have special meaning in a shell:

str: Required, the string to be quoted, which is a string

local handle = io.popen("ls " .. ya.quote(filename))

`truncate(text, opts)`

Truncate the text to the specified length and return it:

text - Required, the text to be truncated, which is a string.
opts - Required, the options of the truncation, which is a table:
- max - Required, the maximum length of the text, which is an integer.
- rtl - Optional, whether the text is right-to-left, which is a boolean.

`time()`

Returns the current timestamp, which is a float, the integer part represents the seconds, and the decimal part represents the milliseconds.

`sleep(secs)`

Waits until secs has elapsed:

secs: Required, the number of seconds to sleep, which is a positive float

ya.sleep(0.5)  -- Sleep for 500 milliseconds

This function is only available in the async context.

`uid()`

Only available on Unix-like systems. Returns the user id of the current user, which is an integer.

`gid()`

Only available on Unix-like systems. Returns the group id of the current user, which is an integer.

`user_name(uid)`

Get the name of the user:

uid - Optional, the user id of the user, which is an integer. If not set, it will use the current user's id.

Returns the name of the current user, which is a string if successful; otherwise, nil.

This function is only available on Unix-like systems.

`group_name(gid)`

Get the name of the user group:

gid - Optional, the group id of the user, which is an integer. If not set, it will use the current user's group id.

Returns the name of the current group, which is a string if successful; otherwise, nil.

This function is only available on Unix-like systems.

`host_name()`

Only available on Unix-like systems. Returns the hostname of the current machine, which is a string if successful; otherwise, nil.

ps

Yazi's DDS (Data Distribution Service) uses a Lua-based publish-subscribe model as its carrier. That is, you can achieve cross-instance communication and state persistence through the ps API. See DDS for details.

The following functions can only be used within a sync context.

`pub(kind, value)`

ps.pub("greeting", "Hello, World!")

Publish a message to the current instance, and all plugins subscribed through sub() for this kind will receive it, achieving internal communication within the instance:

kind - Required, the kind of the message, which is a string of alphanumeric with dashes, and cannot be built-in kinds.
value - Required, the value of the message, which is a sendable value

Since the kind is used globally, to add the plugin name as the prefix is a best practice. For example, the combination of the plugin my-plugin and the kind event1 would be my-plugin-event1.

`pub_to(receiver, kind, value)`

ps.pub_to(1711957283332834, "greeting", "Hello, World!")

Publish a message to a specific instance with receiver as the ID:

If the receiver is the current instance (local), and is subscribed to this kind through sub(), it will receive this message.
If the receiver is not the current instance (remote), and is subscribed to this kind through sub_remote(), it will receive this message.

With:

receiver - Required, ID of the remote instance, which is a integer; if it's 0 then broadcasting to all remote instances
kind - The same as pub()
value - The same as pub()

`pub_static(severity, kind, value)`

-- Broadcast and store a static message
ps.pub_static(10, "greeting", "Hello, World!")
-- Broadcast and remove a static message
ps.pub_static(10, "greeting", nil)

Broadcast a static message to all remote instances subscribed to this kind through sub_remote():

severity - Required, the severity of the message, which is an integer with a range of 0 to 65535
kind - The same as pub()
value - The same as pub(). If the value is nil, the static message will be unpersisted.

The message will be stored as static data to achieve state persistence, and when a new instance is created, it will receive all static messages broadcasted by sub_remote() before in descending order of severity to restore its state from the data.

If you simply want to broadcast a message to all remote instances, without the need for the message to be persisted, use ps.pub_to() with receiver 0 instead.

`sub(kind, callback)`

ps.sub("cd", function(body)
	ya.err("New cwd", cx.active.current.cwd)
end)

Subscribe to local messages of kind and call the callback handler for it:

kind - Required, the kind of the message, which is a string
callback - Required, the callback function, with a single parameter body containing the content of the message

which runs in a sync context, so you can access app data via cx for the content of interest.

Note: No time-consuming operations should be done in the callback, and the same kind from the same plugin can only be subscribed once, re-subscribing (sub()) before unsubscribing (unsub()) will throw an error.

`sub_remote(kind, callback)`

Similar to sub(), but it subscribes to remote messages of this kind instead of local.

`unsub(kind)`

ps.unsub("my-message")

Unsubscribe from local messages of this kind:

kind - Required, the kind of the message, which is a string

`unsub_remote(kind)`

ps.unsub_remote("my-message")

Unsubscribe from remote messages of this kind:

kind - Required, the kind of the message, which is a string

fs

The following functions can only be used within an async context.

`write(url, data)`

local ok, err = fs.write(url, "hello world")

Write data to the specified file:

url - Required, the Url of the file
data - Required, the data to be written, which is a string

Returns (ok, err):

ok - Whether the operation is successful, which is a boolean
err - The error code if the operation is failed, which is an integer if any

`cha(url)`

local cha, err = fs.cha(url)

Get the Cha of the specified file, which is faster than cha_follow() since it never follows the symbolic link:

url - Required, the Url of the file

Returns (cha, err):

cha - The Cha of the file if successful; otherwise, nil
err - The error code if the operation is failed, which is an integer if any

`cha_follow(url)`

local cha, err = fs.cha_follow(url)

Get the Cha of the specified file, and follow the symbolic link:

url - Required, the Url of the file

Returns (cha, err):

cha - The Cha of the file if successful; otherwise, nil
err - The error code if the operation is failed, which is an integer if any

Command

You can invoke external programs through:

local child, err = Command("ls")
	:args({ "-a", "-l" })
	:stdout(Command.PIPED)
	:spawn()

Compared to Lua's os.execute, it provides many comprehensive and convenient methods, and the entire process is async.

It takes better advantage of the benefits of concurrent scheduling. However, it can only be used in async contexts, such as preloaders, previewers, and async functional plugins.

`arg(arg)`

local cmd = Command("ls"):arg("-a"):arg("-l")

Append an argument to the command:

arg - Required, the argument to be appended, which is a string

Returns self.

`args(args)`

local cmd = Command("ls"):args({ "-a", "-l" }):args({ "-h" })

Append multiple arguments to the command:

args - Required, the arguments to be appended, which is a table of strings

Returns self.

`cwd(dir)`

local cmd = Command("ls"):cwd("/root")

Set the current working directory of the command:

dir - Required, the directory of the command, which is a string

Returns self.

`env(key, value)`

local cmd = Command("ls"):env("PATH", "/bin"):env("HOME", "/home")

Append an environment variable to the command:

key - Required, the key of the environment variable, which is a string
value - Required, the value of the environment variable, which is a string

Returns self.

`stdin(cfg)`

local cmd = Command("ls"):stdin(Command.PIPED)

Set the stdin of the command:

cfg - Required, the configuration of the stdin, accepts the following values:
- Command.PIPED - Pipe the stdin
- Command.NULL - Discard the stdin
- Command.INHERIT - Inherit the stdin

If not set, the stdin will be null. Returns self.

`stdout(cfg)`

local cmd = Command("ls"):stdout(Command.PIPED)

Set the stdout of the command:

cfg - Required, the configuration of the stdout, accepts the following values:
- Command.PIPED - Pipe the stdout
- Command.NULL - Discard the stdout
- Command.INHERIT - Inherit the stdout

If not set, the stdout will be null. Returns self.

`stderr(cfg)`

local cmd = Command("ls"):stderr(Command.PIPED)

Set the stderr of the command:

cfg - Required, the configuration of the stderr, accepts the following values:
- Command.PIPED - Pipe the stderr
- Command.NULL - Discard the stderr
- Command.INHERIT - Inherit the stderr

If not set, the stderr will be null. Returns self.

`spawn()`

local child, err = Command("ls"):spawn()

Spawn the command, returns (child, err):

child - The Child of the command if successful; otherwise, nil
err - The error code if the operation is failed, which is an integer if any

`output()`

local output, err = Command("ls"):output()

Spawn the command and wait for it to finish, returns (output, err):

output - The Output of the command if successful; otherwise, nil
err - The error code if the operation is failed, which is an integer if any

Child

This object is created by Command:spawn() and represents a running child process.

You can access the runtime data of this process through its proprietary methods.

`read(len)`

local data, event = child:read(1024)

Let's say "available data source" refers to stdout or stderr that has been set with Command.PIPED, or them both.

read() reads data from the available data source alternately, and the event indicates the source of the data:

The data comes from stdout if event is 0
The data comes from stderr if event is 1
There's no data to read from both stdout and stderr, if event is 2

`read_line()`

local line, event = child:read_line()

Similar to read(), but it reads data line by line.

`read_line_with(opts)`

local line, event = child:wait_line_with { timeout = 500 }

Similar to read_line(), but it accepts a table of options:

timeout - Required, timeout in milliseconds, which is an integer

And includes the following additional events:

Timeout if event is 3

`wait()`

local status, err = child:wait()

Wait for the child process to finish, returns (status, err):

status - The Status of the child process if successful; otherwise, nil
err - The error code if the operation is failed, which is an integer if any

`wait_with_output()`

local output, err = child:wait_with_output()

Wait for the child process to finish and get the output, returns (output, err):

output - The Output of the child process if successful; otherwise, nil
err - The error code if the operation is failed, which is an integer if any

`start_kill()`

local ok, err = child:start_kill()

Send a SIGTERM signal to the child process, returns (ok, err):

ok - Whether the operation is successful, which is a boolean
err - The error code if the operation is failed, which is an integer if any

Output

Properties:

status: The Status of the child process
stdout: The stdout of the child process, which is a string
stderr: The stderr of the child process, which is a string

Status

This object represents the exit status of a child process, and it is created by wait(), or output().

`success()`

local ok = status:success()

Returns whether the child process exited successfully, which is a boolean.

`code()`

local code = status:code()

Returns the exit code of the child process, which is an integer if any.

Utils

ya​

hide()​

file_cache(opts)​

manager_emit(cmd, args)​

image_show(url, rect)​

image_precache(src, dist)​

which(opts)​

input(opts)​

notify(opts)​

dbg(msg, ...)​

err(msg, ...)​

sync(fn)​

preview_code(opts)​

preview_archive(opts)​

preview_widgets(opts, widgets)​

target_family()​

quote(str)​

truncate(text, opts)​

time()​

sleep(secs)​

uid()​

gid()​

user_name(uid)​

group_name(gid)​

host_name()​

ps​

pub(kind, value)​

pub_to(receiver, kind, value)​

pub_static(severity, kind, value)​

sub(kind, callback)​

sub_remote(kind, callback)​

unsub(kind)​

unsub_remote(kind)​

fs​

write(url, data)​

cha(url)​

cha_follow(url)​

Command​

arg(arg)​

args(args)​

cwd(dir)​

env(key, value)​

stdin(cfg)​

stdout(cfg)​

stderr(cfg)​

spawn()​

output()​

Child​

read(len)​

read_line()​

read_line_with(opts)​

wait()​

wait_with_output()​

start_kill()​

Output​

Status​

success()​

code()​

ya

`hide()`

`file_cache(opts)`

`manager_emit(cmd, args)`

`image_show(url, rect)`

`image_precache(src, dist)`

`which(opts)`

`input(opts)`

`notify(opts)`

`dbg(msg, ...)`

`err(msg, ...)`

`sync(fn)`

`preview_code(opts)`

`preview_archive(opts)`

`preview_widgets(opts, widgets)`

`target_family()`

`quote(str)`

`truncate(text, opts)`

`time()`

`sleep(secs)`

`uid()`

`gid()`

`user_name(uid)`

`group_name(gid)`

`host_name()`

ps

`pub(kind, value)`

`pub_to(receiver, kind, value)`

`pub_static(severity, kind, value)`

`sub(kind, callback)`

`sub_remote(kind, callback)`

`unsub(kind)`

`unsub_remote(kind)`

fs

`write(url, data)`

`cha(url)`

`cha_follow(url)`

Command

`arg(arg)`

`args(args)`

`cwd(dir)`

`env(key, value)`

`stdin(cfg)`

`stdout(cfg)`

`stderr(cfg)`

`spawn()`

`output()`

Child

`read(len)`

`read_line()`

`read_line_with(opts)`

`wait()`

`wait_with_output()`

`start_kill()`

Output

Status

`success()`

`code()`