Re: emacs: Handling external dependencies

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+       Wed, 14 Nov 2012 11:43:01 +0200 (EET)\r
+From: Tomi Ollila <tomi.ollila@iki.fi>\r
+To: Ethan Glasser-Camp <ethan.glasser.camp@gmail.com>,\r
+       Damien Cassou <damien.cassou@gmail.com>,\r
+       notmuch mailing list <notmuch@notmuchmail.org>\r
+Subject: Re: emacs: Handling external dependencies\r
+In-Reply-To: <87pq3h56d5.fsf@betacantrips.com>\r
+References:\r
+ <CA+y5ggiGrAcicQLeskaXFoxYyJQVVXZ1VRX=XS8zPFR9_mBFxA@mail.gmail.com>\r
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+Date: Wed, 14 Nov 2012 11:43:00 +0200\r
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+\r
+On Wed, Nov 14 2012, Ethan Glasser-Camp <ethan.glasser.camp@gmail.com> wrote:\r
+\r
+> Damien Cassou <damien.cassou@gmail.com> writes:\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
+> Why not just append it to the *end* of load-path? Then it won't shadow\r
+> anything.\r
+\r
+The scope of the load-path change is for just this one require -- if\r
+header-button required some other modules, the fallback-libs version\r
+should be preferred (in case exists) over loading elsewehere in this case\r
+header-button is loaded from fallback-libs.\r
+\r
+But, maybe we should be more spesific there and use something like:\r
+\r
+(let ((dir (expand-file-name \r
+            "notmuch-deps" \r
+            (file-name-directory (or load-file-name buffer-file-name)))))\r
+  (unless (require 'header-button (concat dir "/header-button.elc") t)\r
+          (require 'header-button (concat dir "/header-button.el") nil)))\r
+\r
+\r
+(if we ever agree to do either kind of loading...)\r
+\r
+> Ethan\r
+\r
+Tomi\r