Re: format and output all received: lines in an e-mail message

Hi Greg,

Keeping you CC'd.

> context: the problem is there are (typically) multiple "Received:"
> header in an e-mail messages; can try either of these
> ----
> bash% fmttest -outsize max +SOMEFOLDER 660 -format "%(putstr{received});"
> bash% fmttest -outsize max +SOMEFOLDER 660 -format "%(putlit{received});"
> ----
> and get either a long line, or a number of lines, but without any real
> indication of how to separate the output into individual "Received"
> lines.

Here's my input test file.

    $ sed -n l mail
    foo: a aa$
    foo: b bb$
    foo: c$
     cc$
    foo:$
     dd$
    foo: e$
    \tee$
    $

Obvious approach, as you found, gives all the values of the Received
fields in one go.

    $ fmttest -outsize max -format '%{foo}' -file mail
    a aa b bb c cc dd e ee
    $

-dump and -trace can be useful for more insight.

    $ fmttest -dump -trace -outsize max -format '%{foo}' -file mail
    Instruction dump of format string: 
    %{foo}
            COMP, comp "foo"
            DONE
            COMP, comp "foo", c_flags 0x8<TRIMMED>
    num=0 str=<nil>
    outbuf="a aa b bb c cc dd e ee"
            DONE
    a aa b bb c cc dd e ee
    $

Using %(putstr) shows the string register being set to the values with a
tab inserted to join them together.

    $ fmttest -dump -trace -outsize max -format '%(putstr{foo})' -file mail
    Instruction dump of format string: 
    %(putstr{foo})
            LS_COMP, comp "foo"
            STR
            DONE
            LS_COMP, comp "foo", c_flags 0x8<TRIMMED>
    num=0 str=" a aa\n\t b bb\n\t c\n cc\n\t\n dd\n\t e\n\tee"
            STR
    outbuf="a aa b bb c cc dd e ee"
            DONE
    a aa b bb c cc dd e ee
    $

Using %(putlit) preserves those tabs.

    $ fmttest -dump -trace -outsize max -format '%(putlit{foo})' -file mail
    Instruction dump of format string: 
    %(putlit{foo})
            LS_COMP, comp "foo"
            STRLIT
            DONE
            LS_COMP, comp "foo", c_flags 0x8<TRIMMED>
    num=0 str=" a aa\n\t b bb\n\t c\n cc\n\t\n dd\n\t e\n\tee"
            STRLIT
    outbuf=" a aa\n\t b bb\n\t c\n cc\n\t\n dd\n\t e\n\tee"
            DONE
     a aa
             b bb
             c
     cc
            
     dd
             e
            ee
    $

But \n\t can't be used to split them back into the original distinct
field values because that may occur within a value, as with my ee test
input.

That's all I've time for at the moment, but others may chip in and this
saves them covering some of the ground.

-- 
Cheers, Ralph.