Improve error message for get and list commands when env file can't be opened
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The error message would previously be confusing. For example, `dotenv -f
. list` would print:
Error: Invalid value: Path "." does not exist.
Instead, we now print:
Error opening env file: [Errno 21] Is a directory: '.'
I used this opportunity to slightly refactor the I/O code (e.g. fewer
system calls and possible race conditions) for those two subcommands
(`get` and `list`).
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The error message would previously be confusing. For example,
dotenv -f . listwould print:Instead, we now print:
I used this opportunity to slightly refactor the I/O code (e.g. fewer system calls and possible race conditions) for those two subcommands (
getandlist).