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Settings: Support null and undefined env var substitutions

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This commit is contained in:
Richard Hansen 2021-06-06 02:14:50 -04:00
parent 299dbbe7e6
commit c7bb18c6da
4 changed files with 65 additions and 10 deletions
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23
settings.json.docker
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@ -24,6 +24,29 @@
*
* This is useful, for example, when running in a Docker container.
*
* DETAILED RULES:
* - If the environment variable is set to the string "true" or "false", the
* value becomes Boolean true or false.
* - If the environment variable is set to the string "null", the value
* becomes null.
* - If the environment variable is set to the string "undefined", the setting
* is removed entirely, except when used as the member of an array in which
* case it becomes null.
* - If the environment variable is set to a string representation of a finite
* number, the string is converted to that number.
* - If the environment variable is set to any other string, including the
* empty string, the value is that string.
* - If the environment variable is unset and a default value is provided, the
* value is as if the environment variable was set to the provided default:
* - "${UNSET_VAR:}" becomes the empty string.
* - "${UNSET_VAR:foo}" becomes the string "foo".
* - "${UNSET_VAR:true}" and "${UNSET_VAR:false}" become true and false.
* - "${UNSET_VAR:null}" becomes null.
* - "${UNSET_VAR:undefined}" causes the setting to be removed (or be set
* to null, if used as a member of an array).
* - If the environment variable is unset and no default value is provided,
* the value becomes null.
*
* EXAMPLE:
* "port": "${PORT:9001}"
* "minify": "${MINIFY}"