Re: emacs: Handling external dependencies

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+       Wed, 14 Nov 2012 11:48:23 +0200 (EET)\r
+From: Tomi Ollila <tomi.ollila@iki.fi>\r
+To: Adam Wolfe Gordon <awg+notmuch@xvx.ca>,\r
+       Damien Cassou <damien.cassou@gmail.com>\r
+Subject: Re: emacs: Handling external dependencies\r
+In-Reply-To:\r
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+Date: Wed, 14 Nov 2012 11:48:23 +0200\r
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+\r
+On Wed, Nov 14 2012, Adam Wolfe Gordon <awg+notmuch@xvx.ca> wrote:\r
+\r
+> Hi Damien,\r
+>\r
+> On Sat, Nov 10, 2012 at 8:58 AM, Damien Cassou <damien.cassou@gmail.com> wrote:\r
+>> I recently sent a patch for notmuch emacs that depends on a particular\r
+>> library. What is the best way to deal with such dependencies?\r
+>\r
+> First off, what's the library, and what is it used for?\r
+>\r
+> I believe that currently the notmuch emacs interface only depends on\r
+> stuff that's included with emacs, which is a nice way to be. There are\r
+> some packages that can improve the notmuch emacs experience if they\r
+> are installed, like w3m. If possible, I'd encourage you to make the\r
+> new library recommended, rather than required.\r
+>\r
+>> I can see different solutions:\r
+>>\r
+>> 1) distribute a rewritten version of the dependency so that the code\r
+>> now belongs to notmuch (e.g., replace the name of the library by\r
+>> 'notmuch'). This has the disadvantage of requiring maintenance when a\r
+>> new version of the library is released and can also be considered\r
+>> 'stealing' by some authors.\r
+>>\r
+>> 2) use a package manager to load the library. This has the\r
+>> disadvantage that the now standard package manager is not in\r
+>> widespread use yet and is not compatible with other OS-based package\r
+>> managers (such as apt-get in Debian).\r
+>>\r
+>> 3) distribute the dependency with the rest of notmuch and load this\r
+>> one. This has the disadvantage of possibly shadowing an already\r
+>> existing version of this library installed through a different means.\r
+>>\r
+>> 4) distribute the dependency with the rest of notmuch (in a separate\r
+>> "fallback-libs/" directory) and load it only when requiring the\r
+>> library with the standard load-path does not work. Jonas Bernoulli\r
+>> gave me a way to do that:\r
+>>\r
+>> ,----\r
+>> | (or (require 'THE-LIB nil t)\r
+>> |     (let ((load-path\r
+>> |           (cons (expand-file-name\r
+>> |                  "fallback-libs"\r
+>> |                  (file-name-directory (or load-file-name buffer-file-name)))\r
+>> |                 load-path)))\r
+>> |       (require 'THE-LIB)))\r
+>> `----\r
+>>\r
+>> What do you think?\r
+>\r
+> I'm not big on any of these solutions. I'd suggest just using the\r
+> package, documenting it as a dependency, and letting users install it\r
+> however they like. This means adding it as a dependency to the\r
+> distro-specific packaging (easy for Debian and friends, not sure about\r
+> others).\r
+\r
+Now that Adam said it I have to agree. IMO design the feature so that it\r
+is disabled unless `header-button` is available. \r
+\r
+> Just my thoughts - offering them mostly since no one else has replied.\r
+>\r
+> -- Adam\r
+\r
+Tomi\r