samedec: add more environment variables #35
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Report valid national periodic tests and national emergencies via `MessageHeader::is_national()`. Both the event and location codes are checked. These messages are reported to samedec child processes via the `$SAMEDEC_IS_NATIONAL` environment variable, which is set to "`Y`" for national messages and is empty otherwise. This is an API-expanding and CLI-expanding change.
Add the `$SAMEDEC_SIG_NUM` environment variable, which contains a numeric representation of the significance level. This is a CLI-expanding change.
Update the samedec README to use the new environment variables. Many distros have replaced pulseaudio with PipeWire, and `paplay` is no longer available on Ubuntu 23.10. While we could switch to `pw-play`—the PipeWire equivalent—rewrite the tutorial around sox instead.
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Add the following new environment variables to spawned child processes:
SAMEDEC_IS_NATIONAL: "Y" for national activations; otherwise present but emptySAMEDEC_SIG_NUM: a numeric representation of the significance levelThe samedec README is updated to account for Ubuntu's migration from pulseaudio to PipeWire.
This is an API-expanding and CLI-expanding change.