Make error messages more user friendly

[calavera]

Make error messages more user friendly

[chrstphrknwtn]

In terms of usability, this is sorely needed. At the moment, errors are just dumped into the .log where one must search through to find the actual reason for netlifyctl returning an error.

A perfect example is trying a command that requires auth, without having first logged in. One would expect that running netlifyctl assets when not logged in would just prompt you to login, as you're attempting an operation that requires auth. As it is, you just get a big fat error log file that pollutes your repo.

[robphoenix]

Another example, running netlifyctl init for the first time:

Received error:

netlifyctl-windows-amd64-0.3.2 ❯ ./netlifyctl.exe init
There was an error running this command.
Debug log dumped to netlifyctl-debug.log
This log includes full recordings of HTTP requests with credentials, be careful if you share it

Logs:

netlifyctl-windows-amd64-0.3.2 ❯ cat netlifyctl-debug.log
time="06 Apr 18 16:00 +0100" level=debug msg=PreRun arguments=[] command=init
time="06 Apr 18 16:00 +0100" level=debug msg="configure debug middleware"
time="06 Apr 18 16:00 +0100" level=debug msg="configure logging middleware"
time="06 Apr 18 16:00 +0100" level=debug msg="setup logger middleware: panic"
time="06 Apr 18 16:00 +0100" level=debug msg="configure auth middleware"
time="06 Apr 18 16:00 +0100" level=debug msg="setup credentials" credentials=0x877cc0
time="06 Apr 18 16:00 +0100" level=debug msg="configure client middleware"
time="06 Apr 18 16:00 +0100" level=debug msg="setup API endpoint" endpoint="https://api.netlify.com"
time="06 Apr 18 16:00 +0100" level=error msg="command failed" error="repository not exists"

Would it be possible to include the error in the returned string from here? The debug log could perhaps only be written if a debug flag is passed and instead the error written to stdout/stderr. In this way I would have received the following error instead of the above:

~ ❯ netlifyctl init
repository does not exist

It's still not hugely helpful, the message comes from the src-d/go-git.v4 package but the messages could be received and improved in some way perhaps depending on the error, ie. adding please run init inside a git repository?