Re: gEDA-user: Units used by software

[andrewm <andrewm@xxxxxxxxxxxxxxx>]

 >> andrewm wrote:
 >> <SNIP about metric footprints>
 >> If it's not been done by anyone already I am going
 >> to just write some kind of parser that does it for
 >> me external.

 > DJ Delorie wrote:
 > Sounds like a useful tool.  Teach it to allow
 > overrides on a per-value basis (like my 2pad script
 > does).  I.e.:
 >
 >       Pin[0.2 0.2 0.5 0.2 0.2 10mil 0.1]
 >
 > Hmm^2... teach pcb's parser to support a unit suffix
 > on each value! We only need mil and mm, but the
 > mechanism should allow for more as needed.  It won't
 > *save* that way, but it lets you read in footprints
 > with human-simpler values.

OK - well I am not very bright and the chances of me
modifying the code tree for PCB without breaking
something are slim to none.  So I shall do it external.

I will public the code, however I would have to prefix
it with a warning that veiwing my C style may cause
people to run away screaming "my eyes my eyes".   It
really is that ugly.

If no one has any better suggestions I am going to make
it take one input file read-modify-write it.

Any line in the file that has a dimension suffix it will
comment out, add a comment line to say it is
autogenerated and then put the computer readable
centimil version.

Eg.

    pin[0.2mm 0.2 0.5 0.2 0.2 10mil 0.1mm]

in the file would end up

#    pin[0.2mm 0.2 0.5 0.2mm 0.2mm 10mil 0.1mm]
# The following line was automatically generated

    pin[7874 7874 19685 7874 7874 1000 3937]


That should mean that you can un-comment the old version
and try again if you made a mistake.

I will make it so that you only need to sufix the unit
if it changes.  In the example above only the first
dimension had a sufix until the units changes at 10mil
and then the next metric after that one needed a sufix
again.

Or is this getting to complex to document for people ?
(it's trivial code wise but may cause headaches in terms
of noob questions)

Finaly any objections to

mm = Millimeter
um = Micrometer
mil = thousanth of an inch
cmil = 100 thousanth of an inch




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