gEDA-bug: [Bug 804898] Re: auto-uref.scm fails if default uref is "?"

[Peter TB Brett <804898@xxxxxxxxxxxxxxxxxx>]

** Changed in: geda
       Status: Fix Committed => Fix Released

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Title:
  auto-uref.scm fails if default uref is "?"

Status in GPL Electronic Design Automation tools:
  Fix Released

Bug description:
  auto-uref.scm fails if the default uref of the symbol is "?".

  To reproduce:

  1) activate auto-uref with the following lines in gnetlistrc:
  (load-from-path "auto-uref.scm")
  (add-hook! add-component-hook auto-uref)

  2) put a symbol with refdes=? to some place where gschem finds it.
  E.g. the symbol attached to this report.

  3) open gschem

  4) add the symbol to the canvas
  The auto-uref script when as the symbol is pasted to the schematic. The failure pulls down gschem, too. The application dies with this backtrace on the stdout:

  /---------------------------
  Backtrace:
  In unknown file:
     ?:  0* [auto-uref (# # # # ...)]
     ?:  {1}* (letrec (# # # # ...) (let* # #))
  In /usr/local/share/gEDA/scheme/auto-uref.scm:
    90:  2  (let* ((refdeses #) (refdes #) (prefix #)) (if prefix (let* # #)))
    94:  3* (if refdes (get-prefix (cdr (get-attribute-name-value refdes))) #f)
    95:  4  [get-prefix "?"]
      ...
    47:  5  (if (= 0 (match:end prefix)) #f (match:substring prefix))
    47:  6* [= 0 ...
    47:  7*  [match:end #f]
  In /usr/share/guile/1.8/ice-9/regex.scm:
   125:  8   (let* ((matchnum (if # # {1})) (end (cdr #))) (if (= end -1) #f end))
   128:  9*  [cdr ...
   128: 10*   [vector-ref #f {1}]

  /usr/share/guile/1.8/ice-9/regex.scm:128:20: In procedure vector-ref in expression (vector-ref match matchnum):
  /usr/share/guile/1.8/ice-9/regex.scm:128:20: Wrong type argument in position 2: 1
  \-------------------------------

  BTW, my use case for "refdes=?" is indeed sub sheet symbols. If the
  urefs of a heirarchy are mangled, I'd still like to keep them as short
  as possible -- A single character. If I need mor than one sub sheet
  per sheet, the character has to be unique. In addition, they should
  not interfere with the usual letters for components. Pure digits fit
  this agenda.

  ---<)kaimartin(>---

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