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Showing content from https://github.com/CogentRedTester/mpv-user-data-loader below:

CogentRedTester/mpv-user-data-loader: A script that allows the mpv `user-data` property to be set at launch and runtime using config files.

A script that allows the mpv user-data property to be more easily configured using config files.

The script does this in two ways:

• user-data fields can be set on startup using config files.
• user-data fields can be set during runtime using script-opts.

There are a few different ways of setting user-data fields at startup.

~~/script-opts/user-data.conf

This is a config file that uses the standard script config syntax of <key>=<value>.

key is the path to the user-data field that will be modified, e.g. script_name/visibility. value is the JSON formatted value that will be set to that field. The key cannot contain any = characters, however you can use escaped character sequences to substitute them.

user-data.conf example:

# comment
script_name/visibility=true
script2/number-of-items=21
script2/text/header="header text"

user-data output:

{
    "script_name": {
        "visibility":true
    },
    "script2": {
        "number-of-items": 21,
        "text": {
            "header": "header text"
        }
    }
}

These are character sequences that can be included in the key to handle characters that cannot be typed directly. The ~0 sequence is only necessary to escape the other sequences, e.g., if you want the output to be param~1 you would use param~01.

The ~1 sequence is currently useless as / characters can be used directly. However, it is reserved for the future in case it becomes possible to include / characters in the name of a user-data field. This is technically allowed by user-data already, but is not supported when trying to access the property directly (set/del commands, property expansion, property observation, etc).

These sequences are based and extended from RFC 6901. It is possible additional character sequences are added in the future

~~/script-opts/user-data.json

This config file uses JSON syntax, which should make it easier to define highly nested user-data values.

The file represents the full user-data property, so to replicate the previous example the json file could simply contain:

{
    "script_name": { "visibility":true },
    "script2": {
        "number-of-items": 21,
        "text": { "header": "header text" }
    }
}

Note that all of the top-level fields (e.g. script_name and script2) directly overwrite the existing value in user-data. This means that if script_name/other_field exists in user-data, it will be removed after "script_name": { "visibility":true } is applied. This will likely change in the future.

The JSON file can be used in conjunction with user-data.conf. The JSON file will be applied first, so will not overwrite the values set in user-data.conf.

The script-opts property can also be set at startup using mpv.conf or with commandline arguments. See changing properties at runtime for the correct syntax.

Values set with script-opts always overwrite the config files.

user-data fields can be modified at runtime using script-opts. This allows the fields to be set from the commandline, from mpv.conf, and from profiles, including conditional auto profiles.

The script-opt is in the form user-data/path/to/field=<JSON value><parameters>. It is nearly identical to the user-data.conf syntax, except that the keys must be prefixed with user-data/ and a list of parameters can optionally be appended to the end (see script-opt parameters). Escaped character sequences are supported for the key.

If a script-opt is removed, then the associated user-data field is reset to the value it had when the first script-opt was applied. This behaviour can be changed with the restore parameter.

If, by some unfortunate coincidence, you are using a script that uses the user- prefix (or perhaps you just prefer underscores) you can substitute the - for a _, e.g. user_data/path/to/field=<JSON value>.

Parameters are a list of optional key-value pairs appended after the JSON value in the form <key>=<value>. Whitespace around the = is allowed and parameters can be separated from the JSON value (and each other) using any character except the following: a-zA-Z0-9_-.

Here are some examples with valid syntax:

script-opts-append=user-data/script_name/visibility=true|param=val|param2=val
script-opts-append=user-data/script2/num=21: param = val param2=val
script-opts-append=user-data/script2/text/header="header text" param = val

Currently there is only one parameter, restore, which behaves similarly to the mpv profile-restore option.

This parameter controls what happens when the script-opt is removed. There are three options:

Currently, if a script-opt is changed instead of removed, then only the restore value of the original script-opt is considered (unless that original value was no). This may change in the future.

script-opts-append=user-data/script_name/visibility=true
script-opts-append=user-data/script2/number-of-items=21
script-opts-append=user-data/script2/text/header="header text"

Applying the script-opts with a profile:

[profile1]
script-opts-append=user-data/script_name/visibility=true
script-opts-append=user-data/script2/number-of-items=21
script-opts-append=user-data/script2/text/header="header text"

Sets a primary-monitor field based on the monitor the mpv window is currently displayed on. The default value would be better placed in user-data.conf where the restore=no would not be necessary. It has been placed here to make the example easier to read.

# sets the default value (probably better to do this is a config file)
script-opts-append=user-data/primary-monitor=false|restore=no

[PrimaryMonitor]
profile-cond=display_names[1] == 'DP-1'
script-opts-append=user-data/primary-monitor=true|restore=copy-equal

[OtherMonitor]
profile-cond=display_names[1] ~= 'DP-1'
script-opts-remove=user-data/primary-monitor

Uses user-data property expansion to append PRIMARY MONITOR to the title of the mpv window:

title='${?media-title:${media-title}}${!media-title:No file} - mpv${?user-data/primary-monitor: - PRIMARY MONITOR}'

[PrimaryMonitor]
profile-cond=display_names[1] == 'DP-1'
script-opts-append=user-data/primary-monitor=true|restore=copy-equal

[OtherMonitor]
profile-cond=display_names[1] ~= 'DP-1'
script-opts-remove=user-data/primary-monitor

mpv --script-opts-append='user-data/script_name/visibility=true' \
    --script-opts-append='user-data/script2/number-of-items=21' \
    --script-opts-append='user-data/script2/text/header="header text"'

Make sure that the " characters around strings are not stripped by the shell.

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