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diagnostic.txt
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diagnostic.txt
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*diagnostic.txt* Diagnostics
NVIM REFERENCE MANUAL
Diagnostic framework *vim.diagnostic*
Nvim provides a framework for displaying errors or warnings from external
tools, otherwise known as "diagnostics". These diagnostics can come from a
variety of sources, such as linters or LSP servers. The diagnostic framework
is an extension to existing error handling functionality such as the
|quickfix| list.
Type |gO| to see the table of contents.
==============================================================================
QUICKSTART *diagnostic-quickstart*
Anything that reports diagnostics is referred to below as a "diagnostic
producer". Diagnostic producers need only follow a few simple steps to
report diagnostics:
1. Create a namespace |nvim_create_namespace()|. Note that the namespace must
have a name. Anonymous namespaces WILL NOT WORK.
2. (Optional) Configure options for the diagnostic namespace
|vim.diagnostic.config()|.
3. Generate diagnostics.
4. Set the diagnostics for the buffer |vim.diagnostic.set()|.
5. Repeat from step 3.
Generally speaking, the API is split between functions meant to be used by
diagnostic producers and those meant for diagnostic consumers (i.e. end users
who want to read and view the diagnostics for a buffer). The APIs for
producers require a {namespace} as their first argument, while those for
consumers generally do not require a namespace (though often one may be
optionally supplied). A good rule of thumb is that if a method is meant to
modify the diagnostics for a buffer (e.g. |vim.diagnostic.set()|) then it
requires a namespace.
*diagnostic-structure*
A diagnostic is a Lua table with the following keys:
lnum: The starting line of the diagnostic
end_lnum: The final line of the diagnostic
col: The starting column of the diagnostic
end_col: The final column of the diagnostic
severity: The severity of the diagnostic |vim.diagnostic.severity|
message: The diagnostic text
source: The source of the diagnostic
Diagnostics use the same indexing as the rest of the Nvim API (i.e. 0-based
rows and columns). |api-indexing|
*vim.diagnostic.severity* *diagnostic-severity*
The "severity" key in a diagnostic is one of the values defined in
`vim.diagnostic.severity`:
vim.diagnostic.severity.ERROR
vim.diagnostic.severity.WARN
vim.diagnostic.severity.INFO
vim.diagnostic.severity.HINT
Functions that take a severity as an optional parameter (e.g.
|vim.diagnostic.get()|) accept one of two forms:
1. A single |vim.diagnostic.severity| value: >
vim.diagnostic.get(0, { severity = vim.diagnostic.severity.WARN })
2. A table with a "min" or "max" key (or both): >
vim.diagnostic.get(0, { severity = {min=vim.diagnostic.severity.WARN})
The latter form allows users to specify a range of severities.
==============================================================================
HANDLERS *diagnostic-handlers*
Diagnostics are shown to the user with |vim.diagnostic.show()|. The display of
diagnostics is managed through handlers. A handler is a table with a "show"
and (optionally) a "hide" function. The "show" function has the signature
>
function(namespace, bufnr, diagnostics, opts)
<
and is responsible for displaying or otherwise handling the given
diagnostics. The "hide" function takes care of "cleaning up" any actions taken
by the "show" function and has the signature
>
function(namespace, bufnr)
<
Handlers can be configured with |vim.diagnostic.config()| and added by
creating a new key in `vim.diagnostic.handlers` (see
|diagnostic-handlers-example|).
The {opts} table passed to a handler is the full set of configuration options
(that is, it is not limited to just the options for the handler itself). The
values in the table are already resolved (i.e. if a user specifies a
function for a config option, the function has already been evaluated).
Nvim provides these handlers by default: "virtual_text", "signs", and
"underline".
*diagnostic-handlers-example*
The example below creates a new handler that notifies the user of diagnostics
with |vim.notify()|: >
-- It's good practice to namespace custom handlers to avoid collisions
vim.diagnostic.handlers["my/notify"] = {
show = function(namespace, bufnr, diagnostics, opts)
-- In our example, the opts table has a "log_level" option
local level = opts["my/notify"].log_level
local name = vim.diagnostic.get_namespace(namespace).name
local msg = string.format("%d diagnostics in buffer %d from %s",
#diagnostics,
bufnr,
name)
vim.notify(msg, level)
end,
}
-- Users can configure the handler
vim.diagnostic.config({
["my/notify"] = {
log_level = vim.log.levels.INFO
}
})
<
In this example, there is nothing to do when diagnostics are hidden, so we
omit the "hide" function.
Existing handlers can be overriden. For example, use the following to only
show a sign for the highest severity diagnostic on a given line: >
-- Create a custom namespace. This will aggregate signs from all other
-- namespaces and only show the one with the highest severity on a
-- given line
local ns = vim.api.nvim_create_namespace("my_namespace")
-- Get a reference to the original signs handler
local orig_signs_handler = vim.diagnostic.handlers.signs
-- Override the built-in signs handler
vim.diagnostic.handlers.signs = {
show = function(_, bufnr, _, opts)
-- Get all diagnostics from the whole buffer rather than just the
-- diagnostics passed to the handler
local diagnostics = vim.diagnostic.get(bufnr)
-- Find the "worst" diagnostic per line
local max_severity_per_line = {}
for _, d in pairs(diagnostics) do
local m = max_severity_per_line[d.lnum]
if not m or d.severity < m.severity then
max_severity_per_line[d.lnum] = d
end
end
-- Pass the filtered diagnostics (with our custom namespace) to
-- the original handler
local filtered_diagnostics = vim.tbl_values(max_severity_per_line)
orig_signs_handler.show(ns, bufnr, filtered_diagnostics, opts)
end,
hide = function(_, bufnr)
orig_signs_handler.hide(ns, bufnr)
end,
}
<
==============================================================================
HIGHLIGHTS *diagnostic-highlights*
All highlights defined for diagnostics begin with `Diagnostic` followed by
the type of highlight (e.g., `Sign`, `Underline`, etc.) and the severity (e.g.
`Error`, `Warn`, etc.)
Sign, underline and virtual text highlights (by default) are linked to their
corresponding default highlight.
For example, the default highlighting for |hl-DiagnosticSignError| is linked
to |hl-DiagnosticError|. To change the default (and therefore the linked
highlights), use the |:highlight| command: >
highlight DiagnosticError guifg="BrightRed"
<
*hl-DiagnosticError*
DiagnosticError
Used as the base highlight group.
Other Diagnostic highlights link to this by default (except Underline)
*hl-DiagnosticWarn*
DiagnosticWarn
Used as the base highlight group.
Other Diagnostic highlights link to this by default (except Underline)
*hl-DiagnosticInfo*
DiagnosticInfo
Used as the base highlight group.
Other Diagnostic highlights link to this by default (except Underline)
*hl-DiagnosticHint*
DiagnosticHint
Used as the base highlight group.
Other Diagnostic highlights link to this by default (except Underline)
*hl-DiagnosticVirtualTextError*
DiagnosticVirtualTextError
Used for "Error" diagnostic virtual text.
*hl-DiagnosticVirtualTextWarn*
DiagnosticVirtualTextWarn
Used for "Warn" diagnostic virtual text.
*hl-DiagnosticVirtualTextInfo*
DiagnosticVirtualTextInfo
Used for "Info" diagnostic virtual text.
*hl-DiagnosticVirtualTextHint*
DiagnosticVirtualTextHint
Used for "Hint" diagnostic virtual text.
*hl-DiagnosticUnderlineError*
DiagnosticUnderlineError
Used to underline "Error" diagnostics.
*hl-DiagnosticUnderlineWarn*
DiagnosticUnderlineWarn
Used to underline "Warn" diagnostics.
*hl-DiagnosticUnderlineInfo*
DiagnosticUnderlineInfo
Used to underline "Info" diagnostics.
*hl-DiagnosticUnderlineHint*
DiagnosticUnderlineHint
Used to underline "Hint" diagnostics.
*hl-DiagnosticFloatingError*
DiagnosticFloatingError
Used to color "Error" diagnostic messages in diagnostics float.
See |vim.diagnostic.open_float()|
*hl-DiagnosticFloatingWarn*
DiagnosticFloatingWarn
Used to color "Warn" diagnostic messages in diagnostics float.
*hl-DiagnosticFloatingInfo*
DiagnosticFloatingInfo
Used to color "Info" diagnostic messages in diagnostics float.
*hl-DiagnosticFloatingHint*
DiagnosticFloatingHint
Used to color "Hint" diagnostic messages in diagnostics float.
*hl-DiagnosticSignError*
DiagnosticSignError
Used for "Error" signs in sign column.
*hl-DiagnosticSignWarn*
DiagnosticSignWarn
Used for "Warn" signs in sign column.
*hl-DiagnosticSignInfo*
DiagnosticSignInfo
Used for "Info" signs in sign column.
*hl-DiagnosticSignHint*
DiagnosticSignHint
Used for "Hint" signs in sign column.
==============================================================================
SIGNS *diagnostic-signs*
Signs are defined for each diagnostic severity. The default text for each sign
is the first letter of the severity name (for example, "E" for ERROR). Signs
can be customized using the following: >
sign define DiagnosticSignError text=E texthl=DiagnosticSignError linehl= numhl=
sign define DiagnosticSignWarn text=W texthl=DiagnosticSignWarn linehl= numhl=
sign define DiagnosticSignInfo text=I texthl=DiagnosticSignInfo linehl= numhl=
sign define DiagnosticSignHint text=H texthl=DiagnosticSignHint linehl= numhl=
When the "severity_sort" option is set (see |vim.diagnostic.config()|) the
priority of each sign depends on the severity of the associated diagnostic.
Otherwise, all signs have the same priority (the value of the "priority"
option in the "signs" table of |vim.diagnostic.config()| or 10 if unset).
==============================================================================
EVENTS *diagnostic-events*
*DiagnosticChanged*
DiagnosticChanged After diagnostics have changed.
Example: >
autocmd DiagnosticChanged * lua vim.diagnostic.setqflist({open = false })
<
==============================================================================
==============================================================================
Lua module: vim.diagnostic *diagnostic-api*
config({opts}, {namespace}) *vim.diagnostic.config()*
Configure diagnostic options globally or for a specific
diagnostic namespace.
Configuration can be specified globally, per-namespace, or
ephemerally (i.e. only for a single call to
|vim.diagnostic.set()| or |vim.diagnostic.show()|). Ephemeral
configuration has highest priority, followed by namespace
configuration, and finally global configuration.
For example, if a user enables virtual text globally with >
vim.diagnostic.config({virtual_text = true})
<
and a diagnostic producer sets diagnostics with >
vim.diagnostic.set(ns, 0, diagnostics, {virtual_text = false})
<
then virtual text will not be enabled for those diagnostics.
Note:
Each of the configuration options below accepts one of the
following:
• `false` : Disable this feature
• `true` : Enable this feature, use default settings.
• `table` : Enable this feature with overrides. Use an
empty table to use default values.
• `function` : Function with signature (namespace, bufnr)
that returns any of the above.
Parameters: ~
{opts} table Configuration table with the following
keys:
• underline: (default true) Use underline for
diagnostics. Options:
• severity: Only underline diagnostics
matching the given severity
|diagnostic-severity|
• virtual_text: (default true) Use virtual
text for diagnostics. Options:
• severity: Only show virtual text for
diagnostics matching the given severity
|diagnostic-severity|
• source: (string) Include the diagnostic
source in virtual text. One of "always"
or "if_many".
• format: (function) A function that takes
a diagnostic as input and returns a
string. The return value is the text used
to display the diagnostic. Example: >
function(diagnostic)
if diagnostic.severity == vim.diagnostic.severity.ERROR then
return string.format("E: %s", diagnostic.message)
end
return diagnostic.message
end
<
• signs: (default true) Use signs for
diagnostics. Options:
• severity: Only show signs for diagnostics
matching the given severity
|diagnostic-severity|
• priority: (number, default 10) Base
priority to use for signs. When
{severity_sort} is used, the priority of
a sign is adjusted based on its severity.
Otherwise, all signs use the same
priority.
• float: Options for floating windows. See
|vim.diagnostic.open_float()|.
• update_in_insert: (default false) Update
diagnostics in Insert mode (if false,
diagnostics are updated on InsertLeave)
• severity_sort: (default false) Sort
diagnostics by severity. This affects the
order in which signs and virtual text are
displayed. When true, higher severities are
displayed before lower severities (e.g.
ERROR is displayed before WARN). Options:
• reverse: (boolean) Reverse sort order
{namespace} number|nil Update the options for the given
namespace. When omitted, update the global
diagnostic options.
disable({bufnr}, {namespace}) *vim.diagnostic.disable()*
Disable diagnostics in the given buffer.
Parameters: ~
{bufnr} number|nil Buffer number, or 0 for current
buffer. When omitted, disable diagnostics in
all buffers.
{namespace} number|nil Only disable diagnostics for the
given namespace.
enable({bufnr}, {namespace}) *vim.diagnostic.enable()*
Enable diagnostics in the given buffer.
Parameters: ~
{bufnr} number|nil Buffer number, or 0 for current
buffer. When omitted, enable diagnostics in
all buffers.
{namespace} number|nil Only enable diagnostics for the
given namespace.
fromqflist({list}) *vim.diagnostic.fromqflist()*
Convert a list of quickfix items to a list of diagnostics.
Parameters: ~
{list} table A list of quickfix items from |getqflist()|
or |getloclist()|.
Return: ~
array of diagnostics |diagnostic-structure|
get({bufnr}, {opts}) *vim.diagnostic.get()*
Get current diagnostics.
Parameters: ~
{bufnr} number|nil Buffer number to get diagnostics from.
Use 0 for current buffer or nil for all buffers.
{opts} table|nil A table with the following keys:
• namespace: (number) Limit diagnostics to the
given namespace.
• lnum: (number) Limit diagnostics to the given
line number.
• severity: See |diagnostic-severity|.
Return: ~
table A list of diagnostic items |diagnostic-structure|.
get_namespace({namespace}) *vim.diagnostic.get_namespace()*
Get namespace metadata.
Parameters: ~
{namespace} number Diagnostic namespace
Return: ~
table Namespace metadata
get_namespaces() *vim.diagnostic.get_namespaces()*
Get current diagnostic namespaces.
Return: ~
table A list of active diagnostic namespaces
|vim.diagnostic|.
get_next({opts}) *vim.diagnostic.get_next()*
Get the next diagnostic closest to the cursor position.
Parameters: ~
{opts} table See |vim.diagnostic.goto_next()|
Return: ~
table Next diagnostic
get_next_pos({opts}) *vim.diagnostic.get_next_pos()*
Return the position of the next diagnostic in the current
buffer.
Parameters: ~
{opts} table See |vim.diagnostic.goto_next()|
Return: ~
table Next diagnostic position as a (row, col) tuple.
get_prev({opts}) *vim.diagnostic.get_prev()*
Get the previous diagnostic closest to the cursor position.
Parameters: ~
{opts} table See |vim.diagnostic.goto_next()|
Return: ~
table Previous diagnostic
get_prev_pos({opts}) *vim.diagnostic.get_prev_pos()*
Return the position of the previous diagnostic in the current
buffer.
Parameters: ~
{opts} table See |vim.diagnostic.goto_next()|
Return: ~
table Previous diagnostic position as a (row, col) tuple.
goto_next({opts}) *vim.diagnostic.goto_next()*
Move to the next diagnostic.
Parameters: ~
{opts} table|nil Configuration table with the following
keys:
• namespace: (number) Only consider diagnostics
from the given namespace.
• cursor_position: (cursor position) Cursor
position as a (row, col) tuple. See
|nvim_win_get_cursor()|. Defaults to the current
cursor position.
• wrap: (boolean, default true) Whether to loop
around file or not. Similar to 'wrapscan'.
• severity: See |diagnostic-severity|.
• float: (boolean or table, default true) If
"true", call |vim.diagnostic.open_float()| after
moving. If a table, pass the table as the {opts}
parameter to |vim.diagnostic.open_float()|.
Unless overridden, the float will show
diagnostics at the new cursor position (as if
"cursor" were passed to the "scope" option).
• win_id: (number, default 0) Window ID
goto_prev({opts}) *vim.diagnostic.goto_prev()*
Move to the previous diagnostic in the current buffer.
Parameters: ~
{opts} table See |vim.diagnostic.goto_next()|
hide({namespace}, {bufnr}) *vim.diagnostic.hide()*
Hide currently displayed diagnostics.
This only clears the decorations displayed in the buffer.
Diagnostics can be redisplayed with |vim.diagnostic.show()|.
To completely remove diagnostics, use
|vim.diagnostic.reset()|.
To hide diagnostics and prevent them from re-displaying, use
|vim.diagnostic.disable()|.
Parameters: ~
{namespace} number|nil Diagnostic namespace. When
omitted, hide diagnostics from all
namespaces.
{bufnr} number|nil Buffer number, or 0 for current
buffer. When omitted, hide diagnostics in all
buffers.
*vim.diagnostic.match()*
match({str}, {pat}, {groups}, {severity_map}, {defaults})
Parse a diagnostic from a string.
For example, consider a line of output from a linter: >
WARNING filename:27:3: Variable 'foo' does not exist
<
This can be parsed into a diagnostic |diagnostic-structure|
with: >
local s = "WARNING filename:27:3: Variable 'foo' does not exist"
local pattern = "^(%w+) %w+:(%d+):(%d+): (.+)$"
local groups = {"severity", "lnum", "col", "message"}
vim.diagnostic.match(s, pattern, groups, {WARNING = vim.diagnostic.WARN})
<
Parameters: ~
{str} string String to parse diagnostics from.
{pat} string Lua pattern with capture groups.
{groups} table List of fields in a
|diagnostic-structure| to associate with
captures from {pat}.
{severity_map} table A table mapping the severity field
from {groups} with an item from
|vim.diagnostic.severity|.
{defaults} table|nil Table of default values for any
fields not listed in {groups}. When
omitted, numeric values default to 0 and
"severity" defaults to ERROR.
Return: ~
diagnostic |diagnostic-structure| or `nil` if {pat} fails
to match {str}.
open_float({bufnr}, {opts}) *vim.diagnostic.open_float()*
Show diagnostics in a floating window.
Parameters: ~
{bufnr} number|nil Buffer number. Defaults to the current
buffer.
{opts} table|nil Configuration table with the same keys
as |vim.lsp.util.open_floating_preview()| in
addition to the following:
• namespace: (number) Limit diagnostics to the
given namespace
• scope: (string, default "line") Show
diagnostics from the whole buffer ("buffer"),
the current cursor line ("line"), or the
current cursor position ("cursor").
• pos: (number or table) If {scope} is "line" or
"cursor", use this position rather than the
cursor position. If a number, interpreted as a
line number; otherwise, a (row, col) tuple.
• severity_sort: (default false) Sort diagnostics
by severity. Overrides the setting from
|vim.diagnostic.config()|.
• severity: See |diagnostic-severity|. Overrides
the setting from |vim.diagnostic.config()|.
• header: (string or table) String to use as the
header for the floating window. If a table, it
is interpreted as a [text, hl_group] tuple.
Overrides the setting from
|vim.diagnostic.config()|.
• source: (string) Include the diagnostic source
in the message. One of "always" or "if_many".
Overrides the setting from
|vim.diagnostic.config()|.
• format: (function) A function that takes a
diagnostic as input and returns a string. The
return value is the text used to display the
diagnostic. Overrides the setting from
|vim.diagnostic.config()|.
• prefix: (function, string, or table) Prefix
each diagnostic in the floating window. If a
function, it must have the signature
(diagnostic, i, total) -> (string, string),
where {i} is the index of the diagnostic being
evaluated and {total} is the total number of
diagnostics displayed in the window. The
function should return a string which is
prepended to each diagnostic in the window as
well as an (optional) highlight group which
will be used to highlight the prefix. If
{prefix} is a table, it is interpreted as a
[text, hl_group] tuple as in |nvim_echo()|;
otherwise, if {prefix} is a string, it is
prepended to each diagnostic in the window with
no highlight. Overrides the setting from
|vim.diagnostic.config()|.
Return: ~
tuple ({float_bufnr}, {win_id})
reset({namespace}, {bufnr}) *vim.diagnostic.reset()*
Remove all diagnostics from the given namespace.
Unlike |vim.diagnostic.hide()|, this function removes all
saved diagnostics. They cannot be redisplayed using
|vim.diagnostic.show()|. To simply remove diagnostic
decorations in a way that they can be re-displayed, use
|vim.diagnostic.hide()|.
Parameters: ~
{namespace} number|nil Diagnostic namespace. When
omitted, remove diagnostics from all
namespaces.
{bufnr} number|nil Remove diagnostics for the given
buffer. When omitted, diagnostics are removed
for all buffers.
set({namespace}, {bufnr}, {diagnostics}, {opts}) *vim.diagnostic.set()*
Set diagnostics for the given namespace and buffer.
Parameters: ~
{namespace} number The diagnostic namespace
{bufnr} number Buffer number
{diagnostics} table A list of diagnostic items
|diagnostic-structure|
{opts} table|nil Display options to pass to
|vim.diagnostic.show()|
setloclist({opts}) *vim.diagnostic.setloclist()*
Add buffer diagnostics to the location list.
Parameters: ~
{opts} table|nil Configuration table with the following
keys:
• namespace: (number) Only add diagnostics from
the given namespace.
• winnr: (number, default 0) Window number to set
location list for.
• open: (boolean, default true) Open the location
list after setting.
• title: (string) Title of the location list.
Defaults to "Diagnostics".
• severity: See |diagnostic-severity|.
setqflist({opts}) *vim.diagnostic.setqflist()*
Add all diagnostics to the quickfix list.
Parameters: ~
{opts} table|nil Configuration table with the following
keys:
• namespace: (number) Only add diagnostics from
the given namespace.
• open: (boolean, default true) Open quickfix list
after setting.
• title: (string) Title of quickfix list. Defaults
to "Diagnostics".
• severity: See |diagnostic-severity|.
*vim.diagnostic.show()*
show({namespace}, {bufnr}, {diagnostics}, {opts})
Display diagnostics for the given namespace and buffer.
Parameters: ~
{namespace} number|nil Diagnostic namespace. When
omitted, show diagnostics from all
namespaces.
{bufnr} number|nil Buffer number, or 0 for current
buffer. When omitted, show diagnostics in
all buffers.
{diagnostics} table|nil The diagnostics to display. When
omitted, use the saved diagnostics for the
given namespace and buffer. This can be
used to display a list of diagnostics
without saving them or to display only a
subset of diagnostics. May not be used when
{namespace} or {bufnr} is nil.
{opts} table|nil Display options. See
|vim.diagnostic.config()|.
toqflist({diagnostics}) *vim.diagnostic.toqflist()*
Convert a list of diagnostics to a list of quickfix items that
can be passed to |setqflist()| or |setloclist()|.
Parameters: ~
{diagnostics} table List of diagnostics
|diagnostic-structure|.
Return: ~
array of quickfix list items |setqflist-what|
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