tree c27411c13223a055e0b12ce3829d4ce674096639
parent 8dec30f2fe23205723e97671398d78c36c87e012
author Adam Sadovsky <asadovsky@gmail.com> 1452840870 -0800
committer Adam Sadovsky <asadovsky@gmail.com> 1452840870 -0800

lib: gosh: address TODOs

More specifically:
- Eliminates Shell.Main, since it's easy enough to use
Shell.Fn and set the returned Cmd's Args
- Renames Shell.Fn to Shell.FuncCmd
- Extends Shell.{Cmd,FuncCmd} comments to explain what's
done with the given arguments
- Makes it so NewShell takes a snapshot of os.Environ() and
uses that henceforth
- Makes it so NewShell filters out any gosh env vars coming
from outside
- Renames registry.go's Fn to Func, Register to
RegisterFunc, and Call to CallFunc
- Adjusts the behavior of RegisterFunc so that names are
augmented to produce collision-resistant handles of the
form "file:line:name"
- Makes callFunc and Func.call private for now, until
there's a clear need for them to be exported
- Eliminates gosh.Run
- Renames Cmd.Shutdown (which we decided to keep) to
Cmd.Terminate
- Changes Cmd.Signal and Cmd.Terminate to fail if Wait
has been called
- Drops Cmd.Kill; if it proves necessary, we'll add a
gosh.Kill implementation of os.Signal that tells
Cmd.Signal and Cmd.Terminate to issue Process.Kill

Also, updates v23test:
- Same changes as in gosh (Fn->FuncCmd, no more Main)
- Replaces v23test.Run with TestMain (simple case) and
InitTestMain (advanced case)
- Eliminates the hack with credentials env vars

MultiPart: 3/8

Change-Id: I43458981706f0bd5c694c898a1213f075d208282