No functional changes are intended; the main package now imports the library
and uses it, but the implementation is unchanged.
Specific highlights:
- Change the names of the functions to avert stutter following the advice of
Effective Go: https://golang.org/doc/effective_go.html#package-names
- Reorganize the helpers in main so control flow is easier to follow.
- Add documentation comments.
- moving to crypto/ssh/terminal, which should also work on Windows
and be better maintained (code.google.com is going away)
- fix support for padding
Closes#2.
