On Nov 24, 2008, at 11:57 AM, Stephen C. Gilardi wrote:
> I've uploaded a patch along those lines: ant-compile-main.patch, > http://tinyurl.com/5azp3u > based on our recent work on this. This includes Compile.java, > main.clj, and modifies build.xml. I've updated this to reflect several of the comments in this thread, revived some behavior form Script.java (loading code from classpath) and included some new ideas to discuss and critique. Thanks very much for the discussion so far! Here's the new patch: http://tinyurl.com/6rnw9q (this does not yet include Perry's recent change to Compile.java or his compile script) Here's the new usage info for clojure.jar (from clojure.main): % java -jar clojure.jar --help Usage: java -jar clojure.jar [option*] [arg*] With no options or args, runs an interactive Read-Eval-Print Loop init options: -i, --init path Load a file or resource -e, --eval expr Evaluate an expression and print its value if non- nil main options: -r, --repl Run a repl path Run a script from from a file or resource - Run a script from standard input -h, -?, --help Print this help message and exit operation: - Establishes thread-local bindings for commonly set!-able vars - Enters the user namespace - Binds *command-line-args* to a seq of strings containing command line args that appear after any main option - Runs all init options in order - Runs a repl or script if requested The init options may be repeated and mixed freely, but must appear before any main option. The appearance of any eval option before running a repl suppresses the usual repl greeting message: "Clojure". Paths may be absolute or relative in the filesystem or relative to classpath. Classpath-relative paths have prefix of @ or @/ % ------------------------------------- Some examples: % java -jar clojure.jar -i @clojure/main.clj loads an init file from classpath (no output, but demonstrating @) % java -jar clojure.jar -e "(+ 3 4)" 7 when eval returns non-nil, we println it % java -jar clojure.jar -e "(println (+ 3 4))" 7 when eval returns nil, we don't print the nil (interpreting it as "nothing") % java -jar clojure.jar -e '"Welcome to Clojure"' -r Welcome to Clojure user=> -e before a repl suppresses the normal repl greeting % java -jar clojure.jar -r 1 2 3 Clojure user=> *command-line-args* (1 2 3) user=> everything after a "main" option (repl or script name) is an arg to the repl or script. % echo "(println \"hi\" *command-line-args*)" > pete-best.clj % java -jar clojure.jar pete-best.clj 1 2 3 hi (1 2 3) run file as a main script with args, no repl, runs and exits % java -jar clojure.jar -i pete-best.clj -r 1 2 3 Clojure hi (1 2 3) user=> *command-line-args* (1 2 3) user=> run as an init file and request a repl, note that both the init file and the repl can see the args init files do not suppress the "Clojure" greeting. Now all the init options (eval and init) are gathered up and executed after the main repl or script starts--in the context of repl bindings, in the user namespace, with *command-line-args* bound and set!-able. If there is no main script or repl specified, only the init options run in a similar context, then clojure.main exits. Please check out the implementation of main.clj as well as the behavior. clojure.main.repl now has hooks for all of its key operations. It has a new "init" hook which is no-op by default but is used by the main repl to run the "init" options. By binding Clojure's input, output, and error streams (*in* *out* and *err*) and/or overriding some of the repl's hooks with custom implementations, one can run a repl anywhere-- with one important case being over a socket connection. Feedback welcome. --Steve --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~----------~----~----~----~------~----~------~--~---
