🍿 debug

Utility functions you can use in your code.

Personally, I have the code below at the top of my init.lua:

lua

_G.dd = function(...)
  Snacks.debug.inspect(...)
end
_G.bt = function()
  Snacks.debug.backtrace()
end
if vim.fn.has("nvim-0.11") == 1 then
  vim._print = function(_, ...)
    dd(...)
  end
else
  vim.print = dd
end

What this does:

Add a global dd(...) you can use anywhere to quickly show a notification with a pretty printed dump of the object(s) with lua treesitter highlighting
Add a global bt() to show a notification with a pretty backtrace.
Override Neovim's vim.print, which is also used by := {something = 123}

📚 Types

lua

---@class snacks.debug.cmd
---@field cmd string|string[]
---@field level? snacks.notifier.level|vim.log.levels
---@field title? string
---@field args? string[]
---@field cwd? string
---@field group? boolean
---@field notify? boolean
---@field footer? string
---@field header? string
---@field props? table<string, string|boolean|number|nil>

lua

---@alias snacks.debug.Trace {name: string, time: number, [number]:snacks.debug.Trace}
---@alias snacks.debug.Stat {name:string, time:number, count?:number, depth?:number}

📦 Module

`Snacks.debug()`

lua

---@type fun(...)
Snacks.debug()

`Snacks.debug.backtrace()`

Show a notification with a pretty backtrace

lua

---@param msg? string|string[]
---@param opts? snacks.notify.Opts
Snacks.debug.backtrace(msg, opts)

`Snacks.debug.cmd()`

lua

---@param opts snacks.debug.cmd
Snacks.debug.cmd(opts)

`Snacks.debug.inspect()`

Show a notification with a pretty printed dump of the object(s) with lua treesitter highlighting and the location of the caller

lua

Snacks.debug.inspect(...)

`Snacks.debug.log()`

Log a message to the file ./debug.log.

a timestamp will be added to every message.
accepts multiple arguments and pretty prints them.
if the argument is not a string, it will be printed using vim.inspect.
if the message is smaller than 120 characters, it will be printed on a single line.

lua

Snacks.debug.log("Hello", { foo = "bar" }, 42)
-- 2024-11-08 08:56:52 Hello { foo = "bar" } 42

lua

Snacks.debug.log(...)

`Snacks.debug.metrics()`

lua

Snacks.debug.metrics()

`Snacks.debug.profile()`

Very simple function to profile a lua function.

flush: set to true to use jit.flush in every iteration.
count: defaults to 100

lua

---@param fn fun()
---@param opts? {count?: number, flush?: boolean, title?: string}
Snacks.debug.profile(fn, opts)

`Snacks.debug.run()`

Run the current buffer or a range of lines. Shows the output of print inlined with the code. Any error will be shown as a diagnostic.

lua

---@param opts? {name?:string, buf?:number, print?:boolean}
Snacks.debug.run(opts)

`Snacks.debug.size()`

lua

Snacks.debug.size(bytes)

`Snacks.debug.stats()`

lua

---@param opts? {min?: number, show?:boolean}
---@return {summary:table<string, snacks.debug.Stat>, trace:snacks.debug.Stat[], traces:snacks.debug.Trace[]}
Snacks.debug.stats(opts)

`Snacks.debug.trace()`

lua

---@param name string?
Snacks.debug.trace(name)

`Snacks.debug.tracemod()`

lua

---@param modname string
---@param mod? table
---@param suffix? string
Snacks.debug.tracemod(modname, mod, suffix)