Would it make sense to add a :gen-class declaration and have the -main
function automatically call the repl function? This would make launching the
repl less painful for new-comers.
- Drew
On Wed, Dec 3, 2008 at 9:27 AM, Stephen C. Gilardi <[EMAIL PROTECTED]> wrote:
>
> I was just about to do that, Randall. :-)
>
> clojure.contrib.repl-ln is a repl that supports lines and line
> numbers. Here's a session that demonstrates it.
>
> --Steve
>
> % java -cp clojure.jar:clojure-contrib.jar clojure.main -e "(use
> 'clojure.contrib.repl-ln)" -e "(repl)"
> 1:1 user=> ; clojure.contrib.repl-ln provides a repl that supports
> lines and line numbers in the input stream
> 1:2 user=> ; every input line is counted. Every input line that's not
> within a clojure object generates a prompt
> 1:3 user=>
> 1:4 user=>
> 1:5 user=> ; even blank lines
> 1:6 user=> 1 2 3 ; multiple objects on one line are all printed, but
> only produce one prompt
> 1
> 2
> 3
> 1:7 user=> jkl ; exceptions show the repl name and line number where
> they happened
> java.lang.Exception: Unable to resolve symbol: jkl in this context
> (repl-1:7)
> 1:8 user=> (/ 1 0)
> java.lang.ArithmeticException: Divide by zero (repl-1:8)
> 1:9 user=> (defn greet [] "
> hello"
> )
> #'user/greet
> 1:12 user=> (meta (var greet)) ; metadata for definitions include repl
> name and line number
> {:file "repl-1", :line 9, :ns #<Namespace user>, :name
> greet, :arglists ([])}
> 1:13 user=> ; the repl name is configurable. It defaults to: "repl-%S"
> where %S is the repl serial number
> 1:14 user=> (repl) ; creating a new repl produces a nested repl with a
> new serial number
> 2:1 user=> ; and a fresh set of line numbers
> 2:2 user=> ; the default prompt is "%S:%L %N=> ", serial number, line
> number, and namespace name
> 2:3 user=> (in-ns 'cool)
> #<Namespace cool>
> 2:4 cool=> ; quitting a repl pops namespace as well
> 2:5 cool=> ^D
> nil
> 1:15 user=> (repl) ; creating a new repl produces a nested repl with a
> new serial number
> 3:1 user=> ; if the prompt is too busy for your taste, you can set it
> to something more familar:
> 3:2 user=> (set-repl-prompt "%N=> ")
> nil
> user=> (repl) ; nested repls inherit their name format and prompt
> format from their parent
> user=> ; this one is serial number 4, but if it's not in the prompt,
> how can we know?
> user=> (repl-info) ; repls have properties accessible this way
> {:name "repl-4", :started #<Date Wed Dec 03 09:02:59 EST 2008>, :name-
> fmt "repl-%S", :prompt-fmt "%N=> ", :serial 4, :thread 1, :depth
> 3, :line 2}
> user=> (print-repl-info) ; or this way
> Name: repl-4
> Started: Wed Dec 03 09:02:59 EST 2008
> Name-fmt: "repl-%S"
> Prompt-fmt: "%N=> "
> Serial: 4
> Thread: 1
> Depth: 3
> Line: 3
> nil
> user=> ; thread id and nesting level are also available for use in the
> prompt and repl name.
> user=> ; a long running clojure could create many of them, say, over
> sockets.
> user=> (set-repl-prompt "%S:%T:%D:%L %N=> ") ; a big ol' prompt
> nil
> 4:1:3:7 user=>
> 4:1:3:8 user=>
> 4:1:3:9 user=>
> 4:1:3:10 user=> (set-repl-name "clojure-%S:%T:%D")
> nil
> 4:1:3:11 user=> kjd
> java.lang.Exception: Unable to resolve symbol: kjd in this context
> (clojure-4:1:3:11)
> 4:1:3:12 user=> ; end-of-stream (^D at the beginning of the line on
> Unix/Mac OS X) quits the repl
> 4:1:3:13 user=> ^D
> nil
> user=> ^D
> nil
> 1:16 user=> ^D
> %
>
>
> >
>
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