New issue 333: Add support for capturing strings from factor variants (eg
versions of deps)
https://bitbucket.org/hpk42/tox/issues/333/add-support-for-capturing-strings-from
Ed Morley:
For projects that use tox to test against multiple versions of deps, it's
common to see this type of version repetition in `deps`:
```
[tox]
envlist =
py{26,27}-pip{062,063,070,071,072,080,081,082,083},
py{26,27,33,34,35}-pip{100,101,102,110,120,121,130,131,140,141,150,151,152,153,154,155,156,600,601,602,603,604,605,606,607,608,610,611,700,701,702,703,710,711,712,800,801,802,803,810,811,812}
deps =
nose
pip062: pip==0.6.2
pip063: pip==0.6.3
pip070: pip==0.7.0
# ...
pip811: pip==8.1.1
pip812: pip==8.1.2
```
It would be great if instead the version component of the factor could be
captured (almost regex group style) and re-used as part of the pip install
command. ie:
```
[tox]
envlist =
py{26,27}-pip{0.6.2,0.6.3,0.7.0,0.7.1,0.7.2,0.8.0,0.8.1,0.8.2,0.8.3},
...
deps =
nose
pip{*}: pip=={0}
```
Where `{0}` denotes the first group matched on the left (though I'm fine with
just allowing only one match per line if that's easier).
This would also require supporting periods in the envlist strings, since tox
currently strips out the non-alphanumeric characters (in the example above,
`tox -l` lists `py26-pip062` rather than the expected `py26-pip0.6.2`).
Apologies if this is filed already (or in fact possible with the current
syntax), I've read the docs and search the tracker, but it's hard to know what
search terms to use.
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