emacs: Handling external dependencies

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+From: Damien Cassou <damien.cassou@gmail.com>\r
+Date: Sat, 10 Nov 2012 16:58:10 +0100\r
+Message-ID:\r
+ <CA+y5ggiGrAcicQLeskaXFoxYyJQVVXZ1VRX=XS8zPFR9_mBFxA@mail.gmail.com>\r
+Subject: emacs: Handling external dependencies\r
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+\r
+Hi,\r
+\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
+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
+--\r
+Damien Cassou\r
+http://damiencassou.seasidehosting.st\r
+\r
+"Success is the ability to go from one failure to another without\r
+losing enthusiasm."\r
+Winston Churchill\r