tox should not silently ignore multiple -e options

[pytoxbot]

• Bitbucket: https://bitbucket.org/hpk42/tox/issue/109
• Originally reported by: @AvdN
• Originally created at: 2013-08-05T11:17:58.375

When you invoke "tox -e py26 --notest" and want to rerun taht py27, one would expect
that just adding " -e py27" at the end of the previous command would work.
But that silently ingores "-e py26" and you have to do "tox -e py26,py27 --notest" (which to me is not a natural commandline invocation YMMV)

Tox should not silently ignore all but the last "-e" option and:

• give out a warning on the correct combination syntax
• add the -e options together.

The three ways of handling this (silent, warning, add together) could be set in $HOME/.tox/tox.ini, if backwards compatibility is required with silently ignoring as default.

[pytoxbot]

Original comment by @hpk42

fix issue109 and fix issue111: multiple "-e" options are now combined
(previously the last one would win). Thanks Anthon van der Neut.

→ <<cset 3be5bca16f8b>>

[pytoxbot]

Original comment by @hpk42

dash_e: fixes #109 and #111

Behaviour of -e has not changed, but can be set by passing True or False
as a parameter multi_dash_e to tox/_config.py: prepare_parse()

This parameter should come from a user specifyable default value
for backwards compatibility. Default should preferable be True after
that is implemented.

_split_env() was factored out of class parseini to enable testing

The issue #111: error on specifying same env twice ("tox -e py27,py27")
fixed. Multiple specifications of the same environment result in
multiple invocation (this could also be selectable in a
configuration file)

→ <>

[pytoxbot]

Original comment by @hpk42

dash_e: fixes #109 and #111

Behaviour of -e has not changed, but can be set by passing True or False
as a parameter multi_dash_e to tox/_config.py: prepare_parse()

This parameter should come from a user specifyable default value
for backwards compatibility. Default should preferable be True after
that is implemented.

_split_env() was factored out of class parseini to enable testing

The issue #111: error on specifying same env twice ("tox -e py27,py27")
fixed. Multiple specifications of the same environment result in
multiple invocation (this could also be selectable in a
configuration file)

→ <<cset 96e1ba41e1c0>>

[pytoxbot]

Original comment by @hpk42

dash_e: fixes #109 and #111

Behaviour of -e has not changed, but can be set by passing True or False
as a parameter multi_dash_e to tox/_config.py: prepare_parse()

This parameter should come from a user specifyable default value
for backwards compatibility. Default should preferable be True after
that is implemented.

_split_env() was factored out of class parseini to enable testing

The issue #111: error on specifying same env twice ("tox -e py27,py27")
fixed. Multiple specifications of the same environment result in
multiple invocation (this could also be selectable in a
configuration file)

→ <>