Re: first adventures

[Ray Andrews <rayandrews@xxxxxxxxxxx>]

On 10/28/2014 09:05 PM, Bart Schaefer wrote:
> } ... so, I finally have my gloriously, deliciously unexpanded, plain
> } vanilla command, exactly as I
>
> Well, you think so, but really it just happens that nothing you typed
> needed to be metafied.
Deo volente! For now I don't even want to think about metafying, my head 
would explode.

> History is expanded by the lexer as each word is consumed, because as
> I mentioned in private email, the expansion has to be re-analyzed to
> correctly tokenize it.  So the previously-discussed point in input.c
> where VERBOSE is handled, is the line with history expanded.
Yeah, that's the right form, but at that point, it's so generous, it 
prints everything the
shell does, like preexec(), and the whole init of the shell.
> When prog is non-NULL (the else branch of that if), it contains the
> compiled form of the input code, which is already broken up into the
> set of commands that will be executed.  There is no human-readable
> decomposed form of the individual commands that make up a finished
> input event; getpermtext(prog) returns the readable form of the entire
> thing, which is the closest you get.
Right, it looks good, and each command is on it's own line;

    $ ls init.c*; ls $PWD/main.* > /tmp/junk
    FILE: init.c LINE: 185
    ls init.c*
    ls $PWD/main.* > /tmp/junk

    (output)

It's proof against expansion of glob, variables and redirection ... 
pretty much all I'm thinking of.
bangchar/history is expanded, and so are aliases, but that's good.
So, if there was just some way of matching each line of that output from 
getpermtext() with the
appropriate command, then I'd be close to the finish line. if, in:

   $ ls main.c; ls init.c; ls version.h

... 'ls init.c' could 'know' that it is  command #2 of 3, then I could 
grab line #2 from getpermtext(), and
if I could then assign that to a shell variable, I'd have exactly what I 
want: each command would have
access to the verbatim command line 'segment' that called it (that is, 
between the semicolons).