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bug#25083: 26.0.50; poor interaction between flymake and desktop-save-mo

From: Sam Steingold
Subject: bug#25083: 26.0.50; poor interaction between flymake and desktop-save-mode
Date: Thu, 01 Dec 2016 14:13:20 -0500

When I start Emacs after editing a bunch of Python files,
desktop-save-mode restores them and flymake starts syntax checking
processes in each of them.

However, there is a snag: python virtual environments.
Basically, each python projects uses a separate virtual environments
which includes its own python packages, and, moreover, its own python
and pylint executables(!)

This means that flymake fails to find the epylint executable and
displays a GUI popup(!) for each(!) python file that I edited in the
previous session.  Note that this failure should _not_ be fatal (see PS

You can imagine, I am sure, how frustrating it is to have to click on
"OK" (or even hit "esc") 30 times before Emacs actually starts.
The workaround is to customize `flymake-gui-warnings-enabled' to nil,
but this is only one part of the problem.

The necessary fixes would entail:

* flymake should only display GUI warnings in response to a manual
  action, not when desktop-save-mode restores a buffer.

* the initial failure in desktop-save-mode should "defer" flymake rather
  than "disable" it permanently.

PS. Fixing the following will probably require pyvenv-specific work and
is outside the core Emacs issues, but maybe you have suggestions:

This initial failure, apparently, makes flymake _disable_ itself in all
restored buffers, so I have to re-enable it manually (if & when I notice
that it is not running there).

When I select the Python virtual environment using the pyvenv-workon
command (I might also disable virtual environment altogether or switch
between them &c), the location of the epylint executable should change.

In GNU Emacs (x86_64-apple-darwin16.1.0, NS appkit-1504.60 Version 
10.12.1 (Build 16B2555))
 of 2016-12-01 built on clr-sds
Repository revision: bb8e38273e701ad5c65e747e8eda3bd8f3aa4adb
Windowing system distributor 'Apple', version 10.3.1504
Recent messages:
Running hg log -r . -l1 --template {i... ....OK = 0
Compiling /Users/sds/.emacs.el...done
Wrote /Users/sds/.emacs.elc
Mark set
Mark saved where search started
nil [2 times]
Scanning for dabbrevs...done

Configured using:
 'configure --with-ns

Configured features:

Important settings:
  value of $LANG: C
  locale-coding-system: utf-8-unix

Major mode: Emacs-Lisp

Minor modes in effect:
  pyvenv-mode: t
  diff-auto-refine-mode: t
  rcirc-track-minor-mode: t
  which-function-mode: t
  url-handler-mode: t
  show-paren-mode: t
  desktop-save-mode: t
  shell-dirtrack-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  abbrev-mode: t

Load-path shadows:
/Users/sds/.emacs.d/elpa/scala-mode-20160902.525/ob-scala hides 

(shadow sort bbdb-message mailalias cookie1 mail-extr gnus-msg gnus-art
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ess-roxy essddr noutline outline easy-mmode hideshow ess-help
ess-r-package ess-s-l ess ess-inf ess-tracebug compile tramp
tramp-compat tramp-loaddefs trampver shell pcomplete comint ansi-color
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byte-compile cl-extra help-mode cconv eieio-core cl-macs eieio-loaddefs
password-cache ess-mode ess-noweb-mode ess-utils ess-generics ess-custom
executable easymenu ess-compat ess-site cl gv cl-loaddefs pcase cl-lib
time-date mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel term/ns-win ns-win ucs-normalize term/common-win
tool-bar dnd fontset image regexp-opt fringe tabulated-list replace
newcomment text-mode elisp-mode lisp-mode prog-mode register page
menu-bar rfn-eshadow isearch timer select scroll-bar mouse jit-lock
font-lock syntax facemenu font-core term/tty-colors frame cl-generic
cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao
korean japanese eucjp-ms cp51932 hebrew greek romanian slovak czech
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text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote kqueue cocoa ns
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Memory information:
((conses 16 642163 39633)
 (symbols 48 46093 0)
 (miscs 40 7223 57)
 (strings 32 210073 19420)
 (string-bytes 1 5186064)
 (vectors 16 81486)
 (vector-slots 8 1396247 7356)
 (floats 8 1232 676)
 (intervals 56 10786 54)
 (buffers 976 58))

Sam Steingold (http://sds.podval.org/) on darwin Ns 10.3.1504
http://steingoldpsychology.com http://www.childpsy.net
http://memri.org https://ffii.org http://thereligionofpeace.com
Those who value Life above Freedom are destined to lose both.

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