zulip-botserver: Document use of environment var in README.md
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```
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zulip-botserver --config-file <path to botserverrc> --hostname <address> --port <port>
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```
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Example: `zulip-botserver --config-file ~/botserverrc`
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This program loads the bot configurations from the
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config file (botserverrc here) and loads the bot modules.
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config file (`botserverrc`, here) and loads the bot modules.
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It then starts the server and fetches the requests to the
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above loaded modules and returns the success/failure result.
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Please make sure you have a current botserverrc file with the
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configurations of the required bots.
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Hostname and Port are optional arguments. Default hostname is
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127.0.0.1 and default port is 5002.
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The `--hostname` and `--port` arguments are optional, and default to
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127.0.0.1 and 5002 respectively.
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The format for a configuration file is:
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[helloworld]
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key=value
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email=helloworld-bot@zulip.com
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site=http://localhost
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token=abcd1234
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Is passed `--use-env-vars` instead of `--config-file`, the
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configuration can instead be provided via the `ZULIP_BOTSERVER_CONFIG`
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environment variable. This should be a JSON-formatted dictionary of
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bot names to dictionary of their configuration; for example:
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ZULIP_BOTSERVER_CONFIG='{"helloworld":{"email":"helloworld-bot@zulip.com","key":"value","site":"http://localhost","token":"abcd1234"}}' \
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zulip-botserver --use-env-vars
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