add support for reading template from stdin #1250
Merged
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Fixes #1247
Some comments:
--tty
is not provided and the template is read from stdin, then it defaults to--tty=false
--tty=true
as a CLI flag and the template is read from stdin, return an error--name
as a CLI flag is not provided and the template is read from stdin, return an error-
as the indicator for stdin, inline with what most Unix-style programs do