You may find this helpful if you should find yourself using Erlang on OS X and you’ve installed it using Macports. After a default installation you’ll need to manually configure your .emacs file for erlang-mode and set your $MANPATH variable correctly, here’s how.
If you’ve installed Erlang with Macports then you may have noticed that when you edit .erl files you’re not entering into erlang-mode, nor is it available to enter into. Here’s how I got erlang-mode working on my system.
Macports will install Erlang into /opt/local/lib/erlang by default. The paths to put in your .emacs file provided in the erlang-mode documentation only need to be tweaked a slight bit to function properly. Here’s what I put in mine:
(setq load-path (cons "/opt/local/lib/erlang/lib/tools-2.6.4/emacs/" load-path)) (setq erlang-root-dir "/opt/local/lib/erlang") (setq exec-path (cons "/opt/local/bin" exec-path)) (require 'erlang-start)
Note that you may require setting “tools-2.6.4” to something else if Macports has upgraded it’s distribution of Erlang.
Setting up your $MANPATH variable is fairly simple as well. Just put the string “/opt/local/lib/erlang/man” in a file called ‘erlang’ in /etc/manpaths.d/ and make sure it ends with an empty line. Test this by opening a new terminal and running: echo $MANPATH | grep erlang. If it doesn’t come back empty then you’ve done it right.
03 Dec 2009 11:12 pm
Having trouble with the man path. I think I did what you said.
created the file, here it is…
bills-macbook-pro:manpaths.d bill$ cd /etc/manpaths.d
bills-macbook-pro:manpaths.d bill$ ls -al
drwxr-xr-x 4 root wheel 136 Dec 3 23:29 .
drwxr-xr-x 94 root wheel 3196 Dec 3 20:56 ..
-rw-r–r– 1 root wheel 19 Jul 11 02:29 X11
-rw-r–r– 1 root wheel 26 Dec 3 23:27 erlang
It contains the right value, and erlang’s man files are there…
bills-macbook-pro:manpaths.d bill$ cat erlang
bills-macbook-pro:manpaths.d bill$ ls /opt/local/lib/erlang/man/
man1 man3 man4 man6
The file ends with a blank line…
bills-macbook-pro:manpaths.d bill$ od -c erlang
0000000 / o p t / l o c a l / l i b / e
0000020 r l a n g / m a n \n
bills-macbook-pro:manpaths.d bill$ echo $MANPATH
Restarted terminal program, logged out, and just for kicks I rebooted the machine. No difference.
04 Dec 2009 04:12 am
In /etc/ there’s another file, “profile”, which is executed each time a new shell is launched much like your ~/.bashrc files. Inside of /etc/profile you can see the application that runs which compiles the $*PATH variables from the /etc/*paths.d folders.
Check out the man page for path_helper. It looks like it will only update $MANPATH with items from the manpaths.d folder if you are already updating it yourself!?
From the man page: “The MANPATH environment variable will not be modified unless it is already set in the environment.”
Here’s my setup:
$ grep MANPATH .bash_profile
$ echo $MANPATH
04 Dec 2009 08:12 pm
Very interesting. I’ll take a look at that. Thanks!
Macports updates their Erlang version @ Technitribe
03 Feb 2010 12:02 am
[…] you fix your Emacs load-path to register the new location. (See my older post on how to initially set up Erlang and Emacs from MacPorts from […]