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Re: How to change environment from a module
- X-seq: zsh-workers 18036
- From: "Bart Schaefer" <schaefer@xxxxxxxxxxxxxxxx>
- To: zsh-workers@xxxxxxxxxx
- Subject: Re: How to change environment from a module
- Date: Sun, 29 Dec 2002 19:23:10 +0000
- In-reply-to: <3e0ec138.10c34e.5239@xxxxxxxxxxxxxxx>
- Mailing-list: contact zsh-workers-help@xxxxxxxxxx; run by ezmlm
- References: <3e0ec138.10c34e.5239@xxxxxxxxxxxxxxx>
On Dec 29, 7:32pm, Mark Hessling wrote:
} [Bart wrote:]
} > In general you shouldn't call bin_ functions directly. They
} > should almost always be called only via the command execution
} > code.
} Why should these functions not be called directly ?
Because they often depend on the generic command setup that is performed
in the execution code in exec.c.
} > It's very likely that your module should call zgetdir(&ds) before
} > running the Rexx program and call restoredir(&ds) after it.
} But this is the only reason for running a Rexx interpreter within the
} current process of the shell; to change the environment permanently.
I can think of other reasons, such as avoiding the overhead of repeated
forks and of reloading the interpreter.
} Based on this premise, then calling routines like zchdir() doesn't
} go the whole way. ie if you have a chpwd() function in .zshrc, then
} zchdir() doesn't call it.
That's true -- zchdir() is a function meant to be called by the zsh
internals at a lower level than the command interpreter.
} So again, how should one call the bin_*() functions directly from a
} module as though a "cd" command or "export" command were executed
} directly by the user ?
This is akin to asking how to attach a clutch pedal to an autmobile with
an automatic transmission. Just because there's a clutch plate in there
somewhere doesn't mean there's an easy way to bolt new a lever to it.
In fact, you're trying to connect an entire second engine to the drive
chain, and wondering why the chassis wasn't designed for that.
The best suggestion I can give you is:
sprintf(command, "\\builtin cd %s", bslashquote(dirname, NULL, 0));
execstring(command, 1, 0);
Where it's up to you to be sure that the command buffer is large enough.
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