Add support for installing via setup.py develop.

4 files changed, 44 insertions, 4 deletions

diff --git a/doc/config.txt b/doc/config.txt
index 9a72abf..356530a 100644
--- a/doc/config.txt
+++ b/doc/config.txt
@@ -22,6 +22,7 @@ List of optional global options::
     distshare=path    # defaults to {homedir}/.tox/distshare
     envlist=ENVLIST   # defaults to the list of all environments
     skipsdist=BOOL    # defaults to false
+    usedevelop=BOOL   # use python setup.py develop, defaults to false
 
 
 ``tox`` autodetects if it is running in a Jenkins_ context
diff --git a/tox/_cmdline.py b/tox/_cmdline.py
index 02cdf09..e28c04b 100644
--- a/tox/_cmdline.py
+++ b/tox/_cmdline.py
@@ -333,6 +333,16 @@ class Session:
             venv.finish()
             return True
 
+    def developpkg(self, venv, setupdir):
+        action = self.newaction(venv, "developpkg", setupdir)
+        with action:
+            try:
+                venv.developpkg(setupdir, action)
+                return True
+            except tox.exception.InvocationError:
+                venv.status = sys.exc_info()[1]
+                return False
+
     def installpkg(self, venv, sdist_path):
         action = self.newaction(venv, "installpkg", sdist_path)
         with action:
@@ -379,10 +389,12 @@ class Session:
             return
         for venv in self.venvlist:
             if self.setupenv(venv):
-                if not self.config.skipsdist:
-                    self.installpkg(venv, sdist_path)
-                else:
+                if self.config.skipsdist:
+                    if self.config.usedevelop:
+                        self.developpkg(venv, self.config.setupdir)
                     self.finishvenv(venv)
+                else:
+                    self.installpkg(venv, sdist_path)
                 self.runtestenv(venv)
         retcode = self._summary()
         return retcode
@@ -422,6 +434,7 @@ class Session:
         self.report.keyvalue("setupdir:   ", self.config.setupdir)
         self.report.keyvalue("distshare:  ", self.config.distshare)
         self.report.keyvalue("skipsdist:  ", self.config.skipsdist)
+        self.report.keyvalue("usedevelop: ", self.config.usedevelop)
         self.report.tw.line()
         for envconfig in self.config.envconfigs.values():
             self.report.line("[testenv:%s]" % envconfig.envname, bold=True)
diff --git a/tox/_config.py b/tox/_config.py
index 96eb4c1..d6e39e4 100644
--- a/tox/_config.py
+++ b/tox/_config.py
@@ -194,7 +194,9 @@ class parseini:
                               homedir=config.homedir)
         config.toxworkdir = reader.getpath(toxsection, "toxworkdir",
                                            "{toxinidir}/.tox")
-        config.skipsdist = reader.getbool(toxsection, "skipsdist", False)
+        config.usedevelop = reader.getbool(toxsection, "usedevelop", False)
+        config.skipsdist = reader.getbool(
+            toxsection, "skipsdist", config.usedevelop)
         config.minversion = reader.getdefault(toxsection, "minversion", None)
 
         # determine indexserver dictionary
diff --git a/tox/_venv.py b/tox/_venv.py
index 9b62f02..f604f10 100644
--- a/tox/_venv.py
+++ b/tox/_venv.py
@@ -1,4 +1,5 @@
 from __future__ import with_statement
+import subprocess
 import sys, os, re
 import py
 import tox
@@ -200,6 +201,29 @@ class VirtualEnv(object):
     def finish(self):
         self._getliveconfig().writeconfig(self.path_config)
 
+    def _needs_reinstall(self, setupdir, action):
+        setup_py = setupdir.join('setup.py')
+        setup_cfg = setupdir.join('setup.cfg')
+        args = [str(self.getconfigexecutable()), str(setup_py), '--name']
+        output = subprocess.Popen(args, stdout=subprocess.PIPE,
+                                  stderr=subprocess.PIPE)
+        out = output.communicate()
+        name = out[0].strip().decode('utf-8')
+        egg_info = setupdir.join('.'.join((name, 'egg-info')))
+        for conf_file in (setup_py, setup_cfg):
+            if (conf_file.check()
+                    and conf_file.mtime() > egg_info.mtime()):
+                return True
+        return False
+
+    def developpkg(self, setupdir, action):
+        assert action is not None
+        self.finish()
+        if not self._needs_reinstall(setupdir, action):
+            return
+        extraopts = ['--no-deps']
+        self._install(['-e', setupdir], extraopts=extraopts, action=action)
+
     def installpkg(self, sdistpath, action):
         assert action is not None
         if getattr(self, 'just_created', False):