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27-Mar 4:32 UTC
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Mailing List Archive: 49091 messages
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"Launch" bug ?

 [1/5] from: athymik::ifrance::com at: 24-Nov-2002 17:28


Hello everybody, Here is my (long) problem : When I try to use "reboot" function in my scripts, I get this error : ** Script Error: launch has no refinement called quit ** Where: reboot ** Near: launch/quit ""
>>
I found it a bit surprising... and when I try to get some help with "help launch" I get : 8<---------------------------------------------------- USAGE: LAUNCH arg /secure-cmd DESCRIPTION: (undocumented) ARGUMENTS: arg -- (Type: any) REFINEMENTS: /secure-cmd 8<---------------------------------------------------- Now, I was *very* surprised to see a system function, "reboot", trying to use a refinement that doesn't exist, and I first thought it was a bug. But I restarted rebol, and I tried to get some more help at the command line : 8<----------------------------------------------------
>> help launch
USAGE: LAUNCH value /reboot /uninstall /link url /quit /secure-cmd DESCRIPTION: Launches a new REBOL interpreter process. LAUNCH is a native value. ARGUMENTS: value -- The command-line arguments (Type: any-string) REFINEMENTS: /reboot /uninstall /link url -- (Type: any) /quit /secure-cmd 8<---------------------------------------------------- I think Rebol overwrites the launch function before executing a script. So I "traced it" (i'm sorry, english is not my mother tongue and i don't know the good word) with "rebol -t" : 8<---------------------------------------------------- Trace: if (word) Trace: system/options/script (path) Trace: [ unprotect 'launch launch: func [arg /secure-cmd] [alert "Launch can only be used by launcher programs."] if all [link? system/options/link-url] [connect-to-link] if do-boot system/options/script system/script/args none [ if all [link? system/options/link-url] [ link-init-done forever [ wait none link-sweep-app ] ] quit ] either view? [ alert reform ["Cannot run script:" system/options/script] quit ] [ print [system/options/script "could not be evaluated."] ] ] (block) Trace: unprotect (word) Trace: 'launch (lit-word) Result: (unset) Trace: launch: (set-word) Trace: func (word) Trace: [arg /secure-cmd] (block) Trace: [alert "Launch can only be used by launcher programs."] (block) 8<---------------------------------------------------- Hmm... Why does Rebol overwrite this function ? Thanks a lot, Regards, Athymik. _____________________________________________ A few weeks ago, I discovered Rebol, A few weeks ago, I discovered a wonder.

 [2/5] from: greggirwin:mindspring at: 24-Nov-2002 11:39


Hi Athymik, A> Hmm... Why does Rebol overwrite this function ? LAUNCH is only really meant for use in the console. This comes up quite a bit as it seems like it could be so handy, but it's RT's call about what features they want to include. -- Gregg

 [3/5] from: athymik:ifrance at: 25-Nov-2002 16:27


> Hi Athymik, > > A> Hmm... Why does Rebol overwrite this function ? > > LAUNCH is only really meant for use in the console. This comes up > quite a bit as it seems like it could be so handy, but it's RT's call > about what features they want to include.
Thank you very much, Gregg. I found an interesting "feature" in launch : it allows Rebol/Core to launch an external program, for example :
>> a: system/options/boot >> rename system/options/boot %tmp >> copy %my_program a >> launch "my-args" >> delete %my_program >> rename %tmp a
Can overwriting LAUNCH be a protection ?
> -- Gregg
Athymik

 [4/5] from: greggirwin:mindspring at: 25-Nov-2002 11:00


<< Can overwriting LAUNCH be a protection ? >> Yes. They do that with a number of things, mostly internal. LAUNCH is handy in the console. If you need that functionality in regular scripts, though, you need to buy View/Pro or /Command. -- Gregg

 [5/5] from: athymik:ifrance at: 25-Nov-2002 21:32


> << Can overwriting LAUNCH be a protection ? >> > > Yes. They do that with a number of things, mostly internal. LAUNCH is > handy in the console. If you need that functionality in regular > scripts, though, you need to buy View/Pro or /Command.
Nobody can impose buying View/Pro on everyone using its scripts ! Launching an external program is an essential functionality. I've never seen another language which doesn't allow it. But I may buy View/Pro for my personal usage...
> -- Gregg
Athymik