neovim/runtime/doc/pi_health.txt

*pi_health.txt*   Healthcheck framework

Author: TJ DeVries <devries.timothyj@gmail.com>

                                      Type |gO| to see the table of contents.

==============================================================================
Introduction                            *health*

health.vim is a minimal framework to help users troubleshoot configuration and
any other environment conditions that a plugin might care about. Nvim ships
with healthchecks for configuration, performance, python support, ruby
support, clipboard support, and more.

To run all healthchecks, use: >

        :checkhealth
<
Plugin authors are encouraged to write new healthchecks. |health-dev|

==============================================================================
Commands                                *health-commands*

                                        *:che* *:checkhealth* *:CheckHealth*
:che[ckhealth]  Run all healthchecks.
                                        *E5009*
                Nvim depends on |$VIMRUNTIME|, 'runtimepath' and 'packpath' to
                find the standard "runtime files" for syntax highlighting,
                filetype-specific behavior, and standard plugins (including
                :checkhealth).  If the runtime files cannot be found then
                those features will not work.

:che[ckhealth] {plugins}
                Run healthcheck(s) for one or more plugins. E.g. to run only
                the standard Nvim healthcheck: >
                        :checkhealth nvim
<
                To run the healthchecks for the "foo" and "bar" plugins
                (assuming they are on 'runtimepath' and they have implemented
                the Lua `require("foo.health").check()` interface): >
                        :checkhealth foo bar
<
                To run healthchecks for Lua submodules, use dot notation or
                "*" to refer to all submodules. For example Nvim provides
                `vim.lsp` and `vim.treesitter`:  >
                        :checkhealth vim.lsp vim.treesitter
                        :checkhealth vim*
<
==============================================================================
Functions                               *health-functions* *vim.health*

The Lua "health" module can be used to create new healthchecks. To get started
see |health-dev|.

vim.health.report_start({name})                         *vim.health.report_start()*
        Starts a new report. Most plugins should call this only once, but if
        you want different sections to appear in your report, call this once
        per section.

vim.health.report_info({msg})                           *vim.health.report_info()*
        Reports an informational message.

vim.health.report_ok({msg})                             *vim.health.report_ok()*
        Reports a "success" message.

vim.health.report_warn({msg} [, {advice}])              *vim.health.report_warn()*
        Reports a warning. {advice} is an optional list of suggestions to
        present to the user.

vim.health.report_error({msg} [, {advice}])             *vim.health.report_error()*
        Reports an error. {advice} is an optional list of suggestions to
        present to the user.

==============================================================================
Create a healthcheck                                    *health-dev*

Healthchecks are functions that check the user environment, configuration, or
any other prerequisites that a plugin cares about. Nvim ships with
healthchecks in:
        - $VIMRUNTIME/autoload/health/
        - $VIMRUNTIME/lua/vim/lsp/health.lua
        - $VIMRUNTIME/lua/vim/treesitter/health.lua
        - and more...

To add a new healthcheck for your own plugin, simply create a "health.lua"
module on 'runtimepath' that returns a table with a "check()" function. Then
|:checkhealth| will automatically find and invoke the function.

For example if your plugin is named "foo", define your healthcheck module at
one of these locations (on 'runtimepath'):
        - lua/foo/health/init.lua
        - lua/foo/health.lua

If your plugin also provides a submodule named "bar" for which you want
a separate healthcheck, define the healthcheck at one of these locations:
        - lua/foo/bar/health/init.lua
        - lua/foo/bar/health.lua

All such health modules must return a Lua table containing a `check()`
function.

Copy this sample code into `lua/foo/health.lua`, replacing "foo" in the path
with your plugin name: >

        local M = {}

        M.check = function()
          vim.health.report_start("foo report")
          -- make sure setup function parameters are ok
          if check_setup() then
            vim.health.report_ok("Setup is correct")
          else
            vim.health.report_error("Setup is incorrect")
          end
          -- do some more checking
          -- ...
        end

        return M


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