[racket] developing tools

On Sun, Sep 1, 2013 at 2:54 AM, Robby Findler
<robby at eecs.northwestern.edu>wrote:

> Also, this might help with the dynamic-require approach:
>
>
> http://docs.racket-lang.org/tools/drracket_get_extend.html?q=drracket%3Aget/extend%3Adisallow-re-extension%21#%28def._%28%28lib._drracket%2Ftool-lib..rkt%29._drracket~3aget%2Fextend~3adisallow-re-extension%21%29%29
>

Interesting! Looks like it could gain a lot of time.
So I tried (but failed) to write a simple tool tester.

#lang racket/base
(require drracket/tool
         drracket/private/drsig
         drracket/tool-lib ; will open a new DrRacket frame at the end!
         racket/unit)

; The magic line
(drracket:get/extend:allow-re-extension!)

(define tool (dynamic-require "my-tool.rkt" 'tool@))
(define-values/invoke-unit tool
  (import drracket:tool^))

where my-tool.rkt contains the example code at the bottom of:
http://docs.racket-lang.org/tools/implementing-tools.html

But I'm very unsure about the unit stuff (first time with that, the Guide
didn't help a lot here) and I the following error:
drracket:debug:make-debug-eval-handler: unbound identifier in module in:
drracket:debug:make-debug-eval-handler
I don't know what to do about them (requiring some other files or adding
imports in the invoke-unit did not help).

What is weird is that if I remove the unit related stuff in my-tool.rkt,
and add:

(require drracket/tool-lib)
(drracket:get/extend:allow-re-extension!)

right before the drracket:get/extend:... lines, it works (opens a new frame
with the new tool installed).

Robby, it seems that there is not much to do to make it work, right?

Laurent
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