2011/8/17 cran1988 <rmanolis1...@hotmail.com>:
> My jvm is already UTF-8
> however it works with clojure 1.3.0 beta1
> but i have problems i get an error
> NoSuchMethodError clojure.lang.KeywordLookupSite.<init>(ILclojure/lang/
> Keyword;)V clout.core/request-url (core.clj:53)
The encoding problem and this version incompatibility problem should
not be related. Nothing encoding related has changed between Clojure
1.2 and 1.3, as far as I know. I decided to reply with my answer (even
though your problem is apparently fixed), because I had already begun
writing it and this is a problem many people have. (So hopefully this
could be useful for someone else too.)
2011/8/17 cran1988 <rmanolis1...@hotmail.com>:
> I tried (str "Γεια!")
> and i got "����!"
> what can I do to fix it ?
Clojure has a modern string model in which a string is a logical
sequence of characters, not bytes. However, Clojure cannot fix
problems outside the Clojure process, so
you can still get problems like this.
Track A - You are running the Clojure REPL in a terminal window
Before you check for any Clojure-related issues, let's make sure it's
not caused by the terminal or your OS.
Make sure that your locale is set to one with the UTF-8 encoding
scheme (in most modern OSes this should be the case). In Unix-like
systems, you can check it like this:
raek@sirius:~$ echo $LANG
sv_SE.utf8
Here sv_SE means Swedish, but it's the part after the dot that's
interesting. After this, make sure the encoding in your terminal is
set to UTF-8 too. In gnome-terminal (default terminal application in
Ubuntu) make sure that "Unicode (UTF-8)" is selected in the Terminal
-> Set Character Encoding menu. This should hopefully already be UTF-8
in most modern OSes. In PuTTY (a common terminal application on
Windows) go to the Window -> Translation tree item and select UTF-8 in
the topmost drop down list. UTF-8 is *not* the default encoding scheme
in PuTTY, - ISO 8859-1 is.
Now when you have a confirmed UTF-8 terminal, let's look at the
Clojure side. If you use JLine or use the default installation of
Leiningen (which uses JLine), you should abandon it. JLine does not
support modern encoding schemes like UTF-8 and garbles the data
without warnings. Use the rlwrap application instead. It does the same
thing but works for encodings like UTF-8. If you install it using your
OS package manager (e.g. apt-get on Ubuntu), Leiningen will pick it up
and use it instead of JLine automatically.
At this point, using any characters in the repl should just work.
There can be subtle problems with encodings if you happen to configure
things badly for both the input and output of the REPL - you can have
a problem that undoes itself. To verify that the text the Clojure REPL
receives is really the one you wrote, you can use this simple test:
user=> (seq "Γεια")
(\Γ \ε \ι \α)
I.e. you give Clojure a string and ask it to display its individual
characters. If you see a sequence of four characters here (and they
display correctly), everything is good. If you see another number of
characters something is still wrong.
Track B - You are using the Slime REPL in Emacs
If you recent versions of clojure-mode use the clojure-jack-in way of
doing things, this should just work. Oherwise you just need to set a
variable:
M-x customize-variable <RET> slime-net-coding-system
(select "utf-8-unix" and save)
Or you can add this to your config:
(setq slime-net-coding-system 'utf-8-unix)
And that should be it. Use "the seq test" above to verify.
I hope this helps! Please tell me if any step is not working.
the "Encoding Guy" at your service,
Rasmus Svensson (raek)
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