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bug#22850: 25.1.50; Wishlist: Rework how Emacs decides to follow links


From: Lars Ingebrigtsen
Subject: bug#22850: 25.1.50; Wishlist: Rework how Emacs decides to follow links
Date: Tue, 01 Mar 2016 01:04:01 +1100

When you click on a link, the browse-url-browser-function variable
decides how a link would is to be followed.  When Emacs got its own web
browser, we needed a way to say "but what if I want to open this in
another browser?", so we got the shr-external-browser variable.

This leads to inconsistencies in how we interact with links, especially
when we contemplate doing away with the Info format and using HTML
instead.

What we want is this, I think:  A way to say what the internal browser
is (eww, emacs-w3m, etc), and a way to say what the preferred external
browser is (Firefox, Chrome, etc), and a way to say that we prefer to
use either the external or the internal browser by default.

So here's what I propose: Three new variables.

browse-url-internal-browser
browse-url-external-browser
browse-url-use-internal-browser (which would be nil/non-nil)

All commands that follow links (in all modes) will allow you to choose
whether to use the default or the non-default method.  That is, hitting
`RET' on a link would, if `browse-url-use-internal-browser' is set, open
the link using the internal browser.  `C-u RET' would use the external
browser.

And if it's not set, then `RET' would use the external browser, and `C-u
RET' would use the internal browser.

I think this would be flexible, but completely transparent and
predictable for the user.  Today, if you hit `RET' on a link in erc,
it's going to do something else than if you hit `RET' on a link in an
HTML mail in Gnus.



In GNU Emacs 25.1.50.48 (x86_64-unknown-linux-gnu, GTK+ Version 3.16.7)
 of 2016-02-29 built on mouse
Repository revision: 379a846b8548dc32a9019ef0a37c02f62cd9bad1
Windowing system distributor 'The X.Org Foundation', version 11.0.11702000
System Description:     Ubuntu 15.10

Configured using:
 'configure --with-xwidgets --with-x-toolkit=gtk3'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF GSETTINGS
NOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 XWIDGETS

Important settings:
  value of $LC_MONETARY: nb_NO.UTF-8
  value of $LC_NUMERIC: nb_NO.UTF-8
  value of $LC_TIME: nb_NO.UTF-8
  value of $LANG: C
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Emacs-Lisp

Minor modes in effect:
  shell-dirtrack-mode: t
  diff-auto-refine-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
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  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t

Recent messages:
Mark set
Mark saved where search started
Mark set
Mark saved where search started
Making completion list...
Mark saved where search started
Mark set
Mark saved where search started
Mark set
Making completion list...

Load-path shadows:
~/src/emacs/elpa/packages/debbugs/debbugs-org hides 
/home/larsi/.emacs.d/elpa/debbugs-0.7/debbugs-org
~/src/emacs/elpa/packages/debbugs/debbugs-browse hides 
/home/larsi/.emacs.d/elpa/debbugs-0.7/debbugs-browse
~/src/emacs/elpa/packages/debbugs/debbugs-gnu hides 
/home/larsi/.emacs.d/elpa/debbugs-0.7/debbugs-gnu
~/src/emacs/elpa/packages/debbugs/debbugs hides 
/home/larsi/.emacs.d/elpa/debbugs-0.7/debbugs

Features:
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gnus-ml gmane spam-gmane dns mm-url disp-table nndoc gnus-fun gnus-mdrtn
gnus-topic nndraft nnmh utf-7 nnfolder copyright network-stream nsm
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gnus-srvr gnus-score score-mode nnvirtual gnus-msg gnus-art mm-uu
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shr svg browse-url imdb dom pvr debug debbugs-gnu easy-mmode derived
subr-x debbugs soap-client mm-decode mm-bodies mm-encode url-http tls
gnutls url-auth mail-parse rfc2231 rfc2047 rfc2045 ietf-drums url-gw
puny url url-proxy url-privacy url-expand url-methods url-history
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dbusbind inotify dynamic-setting system-font-setting font-render-setting
xwidget-internal move-toolbar gtk x-toolkit x multi-tty
make-network-process emacs)

Memory information:
((conses 16 1239345 132112)
 (symbols 48 151151 39)
 (miscs 40 615 2727)
 (strings 32 254878 17581)
 (string-bytes 1 9402816)
 (vectors 16 47199)
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 (floats 8 2021 2558)
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 (buffers 976 74)
 (heap 1024 240347 119366))

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no






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