[MacPorts] #56636: Eric4 is obsolete. Update to Eric6

[MacPorts]

#56636: Eric4 is obsolete. Update to Eric6
--------------------------+--------------------
  Reporter:  josephsacco  |      Owner:  (none)
      Type:  update       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.5.2
Resolution:               |   Keywords:
      Port:  eric4        |
--------------------------+--------------------

Comment (by josephsacco):

 Adding {{{port:python{python.version}}}} as a dependency turns out to be
 unnecessary. The 'destroot' section explicitly uses {{{${python.bin}}}}.

 I pondered over how to determine the set of required dependencies for each
 variant.  The problem is my iMac has many, many packages already
 installed.  I believe the solution is to use python virtual environments,
 which will allow me to control which packages are available.

 I did a simple experiment this morning.  I setup virtual environments for
 both python36 and python37 and built eric6-18.07 directly from the source.
 The eric6 install.py script does a dependency check. When it determines
 something is missing, it asks if it should download the missing dependency
 using pip. I said 'yes' each time. Eric6 [default pyqt=5] built without
 error for both python36 and python37.

 The minimal set of dependencies for each build are:
 * PyQt5
 * PyQt5-sip
 * QScintilla


 as seen in package listings shown below:

 {{{
 (env-3.6) cavandish:env-3.6 jsacco$ pip list
 Package    Version
 ---------- -------
 pip        10.0.1
 PyQt5      5.11.2
 PyQt5-sip  4.19.12
 QScintilla 2.10.7
 setuptools 40.0.0
 wheel      0.31.1

 (env-3.7) cavandish:env-3.7 jsacco$ pip list
 Package    Version
 ---------- -------
 pip        10.0.1
 PyQt5      5.11.2
 PyQt5-sip  4.19.12
 QScintilla 2.10.7
 setuptools 40.0.0
 wheel      0.31.1
 }}}

 The author of the Eric6 also lists "nice to have" python modules:
 {{{
 Optionally you may download and install the following python modules to
 make full use of the IDE and the offered plug-ins:

 * Mercurial
 * Subversion
 * PySvn (Python interface to Subversion)
 * Git
 * PyLint
 * CX_Freeze
 * PyEnchant (spell checking)
 }}}

 Now to figure out the mapping between the dependencies lists and MacPorts.

 The fun continues,

 -Joseph

-- 
Ticket URL: <https://trac.macports.org/ticket/56636#comment:16>
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