gEDA-bug: [Bug 810202] [NEW] gnetlist bom trips on missing attrib file

[KaiMartin <810202@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

(as reported to geda-user by Girvin R. Herr)

If there is no attribs file around, the backends bom and bom2 crash with
an irritating error message on the command line:

/---------------------------------------
$gnetlist -g bom xx.sch
    Loading schematic
    [/home/gherr/projects/vds160/original/hardware/dac/docs/xx.sch]
    Backtrace:
    In current input:
        1: 0* [bom "output.net"]
    In /usr/local/share/gEDA/scheme/gnet-bom.scm:
       37: 1  (let ((port #) (attriblist #)) (bom:printlist (cons #
    attriblist) port) ...)
       40: 2* [bom:parseconfig ...
       40: 3*  [open-input-file "attribs"]
    In unknown file:
        ?: 4   [open-file "attribs" "r"]


    <unnamed port>: In procedure open-file in expression (open-file str
    OPEN_READ):
    <unnamed port>: No such file or directory: "attribs"
\-------------------------------

Suggestions:
1) Check for the existence of the attribs file. 

2a) Issue a newbie friendly message, if not.

2b)  produce a sensible default attribs file on the fly.

3) accept a file name on the command line, so you can have different
attribs files for the same project

4) accept a string on the command line to replace the contents of the
attribs file

---<)kaimartin(>---

** Affects: geda
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/810202

Title:
  gnetlist bom trips on missing attrib file

Status in GPL Electronic Design Automation tools:
  New

Bug description:
  (as reported to geda-user by Girvin R. Herr)

  If there is no attribs file around, the backends bom and bom2 crash
  with an irritating error message on the command line:

  /---------------------------------------
  $gnetlist -g bom xx.sch
      Loading schematic
      [/home/gherr/projects/vds160/original/hardware/dac/docs/xx.sch]
      Backtrace:
      In current input:
          1: 0* [bom "output.net"]
      In /usr/local/share/gEDA/scheme/gnet-bom.scm:
         37: 1  (let ((port #) (attriblist #)) (bom:printlist (cons #
      attriblist) port) ...)
         40: 2* [bom:parseconfig ...
         40: 3*  [open-input-file "attribs"]
      In unknown file:
          ?: 4   [open-file "attribs" "r"]

  
      <unnamed port>: In procedure open-file in expression (open-file str
      OPEN_READ):
      <unnamed port>: No such file or directory: "attribs"
  \-------------------------------

  Suggestions:
  1) Check for the existence of the attribs file. 

  2a) Issue a newbie friendly message, if not.

  2b)  produce a sensible default attribs file on the fly.

  3) accept a file name on the command line, so you can have different
  attribs files for the same project

  4) accept a string on the command line to replace the contents of the
  attribs file

  ---<)kaimartin(>---

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