mirror of
https://github.com/tstack/lnav
synced 2024-11-17 15:29:40 +00:00
271 lines
9.7 KiB
ReStructuredText
271 lines
9.7 KiB
ReStructuredText
|
|
.. _Configuration:
|
|
|
|
Configuration
|
|
=============
|
|
|
|
The configuration for **lnav** is stored in the following JSON files in
|
|
:file:`~/.lnav`:
|
|
|
|
* :file:`config.json` -- Contains local customizations that were done using the
|
|
:code:`:config` command.
|
|
* :file:`configs/default/*.json` -- The default configuration files that are
|
|
built into lnav are written to this directory with :file:`.sample` appended.
|
|
Removing the :file:`.sample` extension and editing the file will allow you to
|
|
do basic customizations.
|
|
* :file:`configs/installed/*.json` -- Contains configuration files installed
|
|
using the :option:`-i` flag (e.g. :code:`$ lnav -i /path/to/config.json`).
|
|
* :file:`configs/*/*.json` -- Other directories that contain :file:`*.json`
|
|
files will be loaded on startup. This structure is convenient for installing
|
|
**lnav** configurations, like from a git repository.
|
|
|
|
A valid **lnav** configuration file must contain an object with the
|
|
:code:`$schema` property, like so:
|
|
|
|
.. code-block:: json
|
|
|
|
{
|
|
"$schema": "https://lnav.org/schemas/config-v1.schema.json"
|
|
}
|
|
|
|
.. note::
|
|
|
|
Log format definitions are stored separately in the :file:`~/.lnav/formats`
|
|
directly. See the :ref:`Log Formats<log_formats>` chapter for more
|
|
information.
|
|
|
|
|
|
Options
|
|
-------
|
|
|
|
The following configuration options can be used to customize the **lnav** UI to
|
|
your liking. The options can be changed using the :code:`:config` command.
|
|
|
|
.. jsonschema:: ../schemas/config-v1.schema.json#/properties/ui/properties/keymap
|
|
|
|
.. jsonschema:: ../schemas/config-v1.schema.json#/properties/ui/properties/theme
|
|
|
|
.. jsonschema:: ../schemas/config-v1.schema.json#/properties/ui/properties/clock-format
|
|
|
|
.. jsonschema:: ../schemas/config-v1.schema.json#/properties/ui/properties/dim-text
|
|
|
|
.. jsonschema:: ../schemas/config-v1.schema.json#/properties/ui/properties/default-colors
|
|
|
|
|
|
.. _themes:
|
|
|
|
Theme Definitions
|
|
-----------------
|
|
|
|
User Interface themes are defined in a JSON configuration file. A theme is
|
|
made up of the style definitions for different types of text in the UI. A
|
|
:ref:`definition<theme_style>` can include the foreground/background colors
|
|
and the bold/underline attributes. The style definitions are broken up into
|
|
multiple categories for the sake of organization. To make it easier to write
|
|
a definition, a theme can define variables that can be referenced as color
|
|
values.
|
|
|
|
Variables
|
|
^^^^^^^^^
|
|
|
|
The :code:`vars` object in a theme definition contains the mapping of variable
|
|
names to color values. These variables can be referenced in style definitions
|
|
by prefixing them with a dollar-sign (e.g. :code:`$black`). The following
|
|
variables can also be defined to control the values of the ANSI colors that
|
|
are log messages or plain text:
|
|
|
|
.. csv-table:: ANSI colors
|
|
:header: "Variable Name", "ANSI Escape"
|
|
|
|
"black", "ESC[30m"
|
|
"red", "ESC[31m"
|
|
"green", "ESC[32m"
|
|
"yellow", "ESC[33m"
|
|
"blue", "ESC[34m"
|
|
"magenta", "ESC[35m"
|
|
"cyan", "ESC[36m"
|
|
"white", "ESC[37m"
|
|
|
|
Specifying Colors
|
|
^^^^^^^^^^^^^^^^^
|
|
|
|
Colors can be specified using hexadecimal notation by starting with a hash
|
|
(e.g. :code:`#aabbcc`) or using a color name as found at
|
|
http://jonasjacek.github.io/colors/. If colors are not specified for a style,
|
|
the values from the :code:`styles/text` definition.
|
|
|
|
.. note::
|
|
|
|
When specifying colors in hexadecimal notation, you do not need to have an
|
|
exact match in the XTerm 256 color palette. A best approximation will be
|
|
picked based on the `CIEDE2000 <https://en.wikipedia.org/wiki/Color_difference#CIEDE2000>`_
|
|
color difference algorithm.
|
|
|
|
|
|
|
|
Example
|
|
^^^^^^^
|
|
|
|
The following example sets the black/background color for text to a dark grey
|
|
using a variable and sets the foreground to an off-white. This theme is
|
|
incomplete, but it works enough to give you an idea of how a theme is defined.
|
|
You can copy the code block, save it to a file in
|
|
:file:`~/.lnav/configs/installed/` and then activate it by executing
|
|
:code:`:config /ui/theme example` in lnav. For a more complete theme
|
|
definition, see one of the definitions built into **lnav**, like
|
|
`monocai <https://github.com/tstack/lnav/blob/master/src/themes/monocai.json>`_.
|
|
|
|
.. code-block:: json
|
|
|
|
{
|
|
"$schema": "https://lnav.org/schemas/config-v1.schema.json",
|
|
"ui": {
|
|
"theme-defs": {
|
|
"example1": {
|
|
"vars": {
|
|
"black": "#2d2a2e"
|
|
},
|
|
"styles": {
|
|
"text": {
|
|
"color": "#f6f6f6",
|
|
"background-color": "$black"
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
Reference
|
|
^^^^^^^^^
|
|
|
|
.. jsonschema:: ../schemas/config-v1.schema.json#/properties/ui/properties/theme-defs/patternProperties/([\w\-]+)/properties/vars
|
|
|
|
.. jsonschema:: ../schemas/config-v1.schema.json#/properties/ui/properties/theme-defs/patternProperties/([\w\-]+)/properties/styles
|
|
|
|
.. jsonschema:: ../schemas/config-v1.schema.json#/properties/ui/properties/theme-defs/patternProperties/([\w\-]+)/properties/syntax-styles
|
|
|
|
.. jsonschema:: ../schemas/config-v1.schema.json#/properties/ui/properties/theme-defs/patternProperties/([\w\-]+)/properties/status-styles
|
|
|
|
.. jsonschema:: ../schemas/config-v1.schema.json#/properties/ui/properties/theme-defs/patternProperties/([\w\-]+)/properties/log-level-styles
|
|
|
|
.. _theme_style:
|
|
|
|
.. jsonschema:: ../schemas/config-v1.schema.json#/definitions/style
|
|
|
|
|
|
.. _keymaps:
|
|
|
|
Keymap Definitions
|
|
------------------
|
|
|
|
Keymaps in **lnav** map a key sequence to a command to execute. When a key is
|
|
pressed, it is converted into a hex-encoded string that is looked up in the
|
|
keymap. The :code:`command` value associated with the entry in the keymap is
|
|
then executed. Note that the "command" can be an **lnav**
|
|
:ref:`command<commands>`, a :ref:`SQL statement/query<sql-ext>`, or an
|
|
**lnav** script. If an :code:`alt-msg` value is included in the entry, the
|
|
bottom-right section of the UI will be updated with the help text.
|
|
|
|
.. note::
|
|
|
|
Not all functionality is available via commands or SQL at the moment. Also,
|
|
some hotkeys are not implemented via keymaps.
|
|
|
|
Key Sequence Encoding
|
|
^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
Key presses are converted into a hex-encoded string that is used to lookup an
|
|
entry in the keymap. Each byte of the keypress value is formatted as an
|
|
:code:`x` followed by the hex-encoding in lowercase. For example, the encoding
|
|
for the £ key would be :code:`xc2xa3`. To make it easier to discover the
|
|
encoding for unassigned keys, **lnav** will print in the command prompt the
|
|
:code:`:config` command and
|
|
`JSON-Pointer <https://tools.ietf.org/html/rfc6901>`_ for assigning a command
|
|
to the key.
|
|
|
|
.. figure:: key-encoding-prompt.png
|
|
:align: center
|
|
|
|
Screenshot of the command prompt when an unassigned key is pressed.
|
|
|
|
.. note::
|
|
|
|
Since **lnav** is a terminal application, it can only receive keypresses that
|
|
can be represented as characters or escape sequences. For example, it cannot
|
|
handle the press of a modifier key.
|
|
|
|
Reference
|
|
^^^^^^^^^
|
|
|
|
.. jsonschema:: ../schemas/config-v1.schema.json#/properties/ui/properties/keymap-defs/patternProperties/([\w\-]+)
|
|
|
|
|
|
Log Handling
|
|
------------
|
|
|
|
The handling of logs is largely determined by the
|
|
:ref:`log file formats<log_formats>`, this section covers options that are not
|
|
specific to a particular format.
|
|
|
|
Watch Expressions (v0.11.0+)
|
|
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
Watch expressions can be used to fire an event when a log message matches a
|
|
condition. You can then install a listener for these events and trigger an
|
|
action to be performed. For example, to automate filtering based on
|
|
identifiers, a watch expression can match messages that mention the ID and then
|
|
a trigger can install a filter for that ID. Creating a watch expression is
|
|
done by adding an entry into the :code:`/log/watch-expressions` configuration
|
|
tree. For example, to create a watch named "dhcpdiscover" that matches
|
|
DHCPDISCOVER messages from the :code:`dhclient` daemon, you would run the
|
|
following:
|
|
|
|
.. code-block:: lnav
|
|
|
|
:config /log/watch-expressions/dhcpdiscover/expr :log_procname = 'dhclient' AND startswith(:log_body, 'DHCPDISCOVER')
|
|
|
|
The watch expression can refer to column names in the log message by prefixing
|
|
them with a colon. The expression is evaluated by passing the log message
|
|
fields as bound parameters and not against a table. The easiest way to test
|
|
out an expression is with the :ref:`mark_expr` command, since it will behave
|
|
similarly. After changing the configuration, you'll need to restart lnav
|
|
for the effect to take place. You can then query the :code:`lnav_events`
|
|
table to see any generated
|
|
:code:`https://lnav.org/event-log-msg-detected-v1.schema.json` events from the
|
|
logs that were loaded:
|
|
|
|
.. code-block:: custsqlite
|
|
|
|
;SELECT * FROM lnav_events
|
|
|
|
From there, you can create a SQLite trigger on the :code:`lnav_events` table
|
|
that will examine the event contents and perform an action. See the
|
|
:ref:`Events` section for more information on handling events.
|
|
|
|
Reference
|
|
^^^^^^^^^
|
|
|
|
.. jsonschema:: ../schemas/config-v1.schema.json#/properties/log/properties/watch-expressions/patternProperties/([\w\-]+)
|
|
|
|
.. _tuning:
|
|
|
|
Tuning
|
|
------
|
|
|
|
The following configuration options can be used to tune the internals of
|
|
**lnav** to your liking. The options can be changed using the :code:`:config`
|
|
command.
|
|
|
|
.. jsonschema:: ../schemas/config-v1.schema.json#/properties/tuning/properties/archive-manager
|
|
|
|
.. jsonschema:: ../schemas/config-v1.schema.json#/properties/tuning/properties/clipboard
|
|
|
|
.. jsonschema:: ../schemas/config-v1.schema.json#/definitions/clip-commands
|
|
|
|
.. jsonschema:: ../schemas/config-v1.schema.json#/properties/tuning/properties/file-vtab
|
|
|
|
.. jsonschema:: ../schemas/config-v1.schema.json#/properties/tuning/properties/logfile
|
|
|
|
.. jsonschema:: ../schemas/config-v1.schema.json#/properties/tuning/properties/remote/properties/ssh
|